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| author | Andreas Baumann <mail@andreasbaumann.cc> | 2015-01-03 12:04:58 +0100 |
|---|---|---|
| committer | Andreas Baumann <mail@andreasbaumann.cc> | 2015-01-03 12:04:58 +0100 |
| commit | 008d0be72b2f160382c6e880765e96b64a050c65 (patch) | |
| tree | 36f48a98a3815a408e2ce1693dd182af90f80305 /release/src/router/busybox/ash.c | |
| parent | 611becfb8726c60cb060368541ad98191d4532f5 (diff) | |
| download | tomato-008d0be72b2f160382c6e880765e96b64a050c65.tar.gz tomato-008d0be72b2f160382c6e880765e96b64a050c65.tar.bz2 | |
imported original firmware WRT54GL_v4.30.11_11_US
Diffstat (limited to 'release/src/router/busybox/ash.c')
| -rw-r--r-- | release/src/router/busybox/ash.c | 12866 |
1 files changed, 12866 insertions, 0 deletions
diff --git a/release/src/router/busybox/ash.c b/release/src/router/busybox/ash.c new file mode 100644 index 00000000..2554d12b --- /dev/null +++ b/release/src/router/busybox/ash.c @@ -0,0 +1,12866 @@ +/* vi: set sw=4 ts=4: */ +/* + * ash shell port for busybox + * + * Copyright (c) 1989, 1991, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * This version of ash is adapted from the source in Debian's ash 0.3.8-5 + * package. + * + * Modified by Erik Andersen <andersee@debian.org> and + * Vladimir Oleynik <dzo@simtreas.ru> to be used in busybox + * + * + * Original copyright notice is retained at the end of this file. + */ + + +/* These defines allow you to adjust the feature set to be compiled + * into the ash shell. As a rule, enabling these options will make + * ash get bigger... With all of these options off, ash adds about + * 60k to busybox on an x86 system.*/ + + +/* Enable job control. This allows you to run jobs in the background, + * which is great when ash is being used as an interactive shell, but + * it completely useless for is all you are doing is running scripts. + * This adds about 2.5k on an x86 system. */ +#undef JOBS + +/* This enables alias support in ash. If you want to support things + * like "alias ls='ls -l'" with ash, enable this. This is only useful + * when ash is used as an intractive shell. This adds about 1.5k */ +#define ASH_ALIAS + +/* If you need ash to act as a full Posix shell, with full math + * support, enable this. This adds a bit over 2k an x86 system. */ +//#undef ASH_MATH_SUPPORT +#define ASH_MATH_SUPPORT + +/* Getopts is used by shell procedures to parse positional parameters. + * You probably want to leave this disabled, and use the busybox getopt + * applet if you want to do this sort of thing. There are some scripts + * out there that use it, so it you need it, enable. Most people will + * leave this disabled. This adds 1k on an x86 system. */ +#undef ASH_GETOPTS + +/* This allows you to override shell builtins and use whatever is on + * the filesystem. This is most useful when ash is acting as a + * standalone shell. Adds about 272 bytes. */ +#undef ASH_CMDCMD + + +/* Optimize size vs speed as size */ +#define ASH_OPTIMIZE_FOR_SIZE + +/* Enable this to compile in extra debugging noise. When debugging is + * on, debugging info will be written to $HOME/trace and a quit signal + * will generate a core dump. */ +#undef DEBUG + +/* These are here to work with glibc -- Don't change these... */ +#undef FNMATCH_BROKEN +#undef GLOB_BROKEN + +#include <assert.h> +#include <ctype.h> +#include <dirent.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <paths.h> +#include <pwd.h> +#include <setjmp.h> +#include <signal.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sysexits.h> +#include <unistd.h> +#include <sys/stat.h> +#include <sys/cdefs.h> +#include <sys/ioctl.h> +#include <sys/param.h> +#include <sys/resource.h> +#include <sys/time.h> +#include <sys/times.h> +#include <sys/types.h> +#include <sys/wait.h> + + +#if !defined(FNMATCH_BROKEN) +#include <fnmatch.h> +#endif +#if !defined(GLOB_BROKEN) +#include <glob.h> +#endif + +#ifdef JOBS +#include <termios.h> +#endif + +#include "busybox.h" +#include "cmdedit.h" + +/* + * This file was generated by the mksyntax program. + */ + +/* Syntax classes */ +#define CWORD 0 /* character is nothing special */ +#define CNL 1 /* newline character */ +#define CBACK 2 /* a backslash character */ +#define CSQUOTE 3 /* single quote */ +#define CDQUOTE 4 /* double quote */ +#define CENDQUOTE 5 /* a terminating quote */ +#define CBQUOTE 6 /* backwards single quote */ +#define CVAR 7 /* a dollar sign */ +#define CENDVAR 8 /* a '}' character */ +#define CLP 9 /* a left paren in arithmetic */ +#define CRP 10 /* a right paren in arithmetic */ +#define CENDFILE 11 /* end of file */ +#define CCTL 12 /* like CWORD, except it must be escaped */ +#define CSPCL 13 /* these terminate a word */ +#define CIGN 14 /* character should be ignored */ + +/* Syntax classes for is_ functions */ +#define ISDIGIT 01 /* a digit */ +#define ISUPPER 02 /* an upper case letter */ +#define ISLOWER 04 /* a lower case letter */ +#define ISUNDER 010 /* an underscore */ +#define ISSPECL 020 /* the name of a special parameter */ + +#define SYNBASE 130 +#define PEOF -130 + +#define PEOA -129 + +#define TEOF 0 +#define TNL 1 +#define TSEMI 2 +#define TBACKGND 3 +#define TAND 4 +#define TOR 5 +#define TPIPE 6 +#define TLP 7 +#define TRP 8 +#define TENDCASE 9 +#define TENDBQUOTE 10 +#define TREDIR 11 +#define TWORD 12 +#define TASSIGN 13 +#define TNOT 14 +#define TCASE 15 +#define TDO 16 +#define TDONE 17 +#define TELIF 18 +#define TELSE 19 +#define TESAC 20 +#define TFI 21 +#define TFOR 22 +#define TIF 23 +#define TIN 24 +#define TTHEN 25 +#define TUNTIL 26 +#define TWHILE 27 +#define TBEGIN 28 +#define TEND 29 + + +#define BASESYNTAX (basesyntax + SYNBASE) +#define DQSYNTAX (dqsyntax + SYNBASE) +#define SQSYNTAX (sqsyntax + SYNBASE) +#define ARISYNTAX (arisyntax + SYNBASE) + +/* control characters in argument strings */ +#define CTLESC '\201' +#define CTLVAR '\202' +#define CTLENDVAR '\203' +#define CTLBACKQ '\204' +#define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */ +/* CTLBACKQ | CTLQUOTE == '\205' */ +#define CTLARI '\206' +#define CTLENDARI '\207' +#define CTLQUOTEMARK '\210' + +#define is_digit(c) ((c)>='0' && (c)<='9') +#define is_alpha(c) (((c) < CTLESC || (c) > CTLENDARI) && isalpha((unsigned char) (c))) +#define is_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalpha((unsigned char) (c)))) +#define is_in_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalnum((unsigned char) (c)))) +#define is_special(c) ((is_type+SYNBASE)[c] & (ISSPECL|ISDIGIT)) +#define digit_val(c) ((c) - '0') + + +#define _DIAGASSERT(x) + + + +#define S_DFL 1 /* default signal handling (SIG_DFL) */ +#define S_CATCH 2 /* signal is caught */ +#define S_IGN 3 /* signal is ignored (SIG_IGN) */ +#define S_HARD_IGN 4 /* signal is ignored permenantly */ +#define S_RESET 5 /* temporary - to reset a hard ignored sig */ + + +/* variable substitution byte (follows CTLVAR) */ +#define VSTYPE 0x0f /* type of variable substitution */ +#define VSNUL 0x10 /* colon--treat the empty string as unset */ +#define VSQUOTE 0x80 /* inside double quotes--suppress splitting */ + +/* values of VSTYPE field */ +#define VSNORMAL 0x1 /* normal variable: $var or ${var} */ +#define VSMINUS 0x2 /* ${var-text} */ +#define VSPLUS 0x3 /* ${var+text} */ +#define VSQUESTION 0x4 /* ${var?message} */ +#define VSASSIGN 0x5 /* ${var=text} */ +#define VSTRIMLEFT 0x6 /* ${var#pattern} */ +#define VSTRIMLEFTMAX 0x7 /* ${var##pattern} */ +#define VSTRIMRIGHT 0x8 /* ${var%pattern} */ +#define VSTRIMRIGHTMAX 0x9 /* ${var%%pattern} */ +#define VSLENGTH 0xa /* ${#var} */ + +/* flags passed to redirect */ +#define REDIR_PUSH 01 /* save previous values of file descriptors */ +#define REDIR_BACKQ 02 /* save the command output to pipe */ + +/* + * BSD setjmp saves the signal mask, which violates ANSI C and takes time, + * so we use _setjmp instead. + */ + +#if defined(BSD) +#define setjmp(jmploc) _setjmp(jmploc) +#define longjmp(jmploc, val) _longjmp(jmploc, val) +#endif + +/* + * Most machines require the value returned from malloc to be aligned + * in some way. The following macro will get this right on many machines. + */ + +#ifndef ALIGN +union align { + int i; + char *cp; +}; + +#define ALIGN(nbytes) (((nbytes) + sizeof(union align) - 1) & ~(sizeof(union align) - 1)) +#endif + +#ifdef BB_LOCALE_SUPPORT +#include <locale.h> +static void change_lc_all(const char *value); +static void change_lc_ctype(const char *value); +#endif + +/* + * These macros allow the user to suspend the handling of interrupt signals + * over a period of time. This is similar to SIGHOLD to or sigblock, but + * much more efficient and portable. (But hacking the kernel is so much + * more fun than worrying about efficiency and portability. :-)) + */ + +static void onint (void); +static volatile int suppressint; +static volatile int intpending; + +#define INTOFF suppressint++ +#ifndef ASH_OPTIMIZE_FOR_SIZE +#define INTON { if (--suppressint == 0 && intpending) onint(); } +#define FORCEINTON {suppressint = 0; if (intpending) onint();} +#else +static void __inton (void); +static void forceinton (void); +#define INTON __inton() +#define FORCEINTON forceinton() +#endif + +#define CLEAR_PENDING_INT intpending = 0 +#define int_pending() intpending + + +typedef void *pointer; +#ifndef NULL +#define NULL (void *)0 +#endif + +static inline pointer ckmalloc (int sz) { return xmalloc(sz); } +static inline pointer ckrealloc(void *p, int sz) { return xrealloc(p, sz); } +static inline char * savestr (const char *s) { return xstrdup(s); } + +static pointer stalloc (int); +static void stunalloc (pointer); +static void ungrabstackstr (char *, char *); +static char * growstackstr(void); +static char * makestrspace(size_t newlen); +static char *sstrdup (const char *); + +/* + * Parse trees for commands are allocated in lifo order, so we use a stack + * to make this more efficient, and also to avoid all sorts of exception + * handling code to handle interrupts in the middle of a parse. + * + * The size 504 was chosen because the Ultrix malloc handles that size + * well. + */ + +#define MINSIZE 504 /* minimum size of a block */ + + +struct stack_block { + struct stack_block *prev; + char space[MINSIZE]; +}; + +static struct stack_block stackbase; +static struct stack_block *stackp = &stackbase; +static struct stackmark *markp; +static char *stacknxt = stackbase.space; +static int stacknleft = MINSIZE; + + +#define equal(s1, s2) (strcmp(s1, s2) == 0) + +#define stackblock() stacknxt +#define stackblocksize() stacknleft +#define STARTSTACKSTR(p) p = stackblock(), sstrnleft = stackblocksize() + +#define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c))) +#define CHECKSTRSPACE(n, p) { if (sstrnleft < n) p = makestrspace(n); } +#define STACKSTRNUL(p) (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0')) + + +#define USTPUTC(c, p) (--sstrnleft, *p++ = (c)) +#define STUNPUTC(p) (++sstrnleft, --p) +#define STTOPC(p) p[-1] +#define STADJUST(amount, p) (p += (amount), sstrnleft -= (amount)) +#define grabstackstr(p) stalloc(stackblocksize() - sstrnleft) + +#define ckfree(p) free((pointer)(p)) + + +#ifdef DEBUG +#define TRACE(param) trace param +static void trace (const char *, ...); +static void trargs (char **); +static void showtree (union node *); +static void trputc (int); +static void trputs (const char *); +static void opentrace (void); +#else +#define TRACE(param) +#endif + +#define NSEMI 0 +#define NCMD 1 +#define NPIPE 2 +#define NREDIR 3 +#define NBACKGND 4 +#define NSUBSHELL 5 +#define NAND 6 +#define NOR 7 +#define NIF 8 +#define NWHILE 9 +#define NUNTIL 10 +#define NFOR 11 +#define NCASE 12 +#define NCLIST 13 +#define NDEFUN 14 +#define NARG 15 +#define NTO 16 +#define NFROM 17 +#define NFROMTO 18 +#define NAPPEND 19 +#define NTOOV 20 +#define NTOFD 21 +#define NFROMFD 22 +#define NHERE 23 +#define NXHERE 24 +#define NNOT 25 + +/* + * expandarg() flags + */ +#define EXP_FULL 0x1 /* perform word splitting & file globbing */ +#define EXP_TILDE 0x2 /* do normal tilde expansion */ +#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */ +#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */ +#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */ +#define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */ + + +#define NOPTS 16 + +static char optet_vals[NOPTS]; + +static const char * const optlist[NOPTS] = { + "e" "errexit", + "f" "noglob", + "I" "ignoreeof", + "i" "interactive", + "m" "monitor", + "n" "noexec", + "s" "stdin", + "x" "xtrace", + "v" "verbose", + "V" "vi", + "E" "emacs", + "C" "noclobber", + "a" "allexport", + "b" "notify", + "u" "nounset", + "q" "quietprofile" +}; + +#define optent_name(optent) (optent+1) +#define optent_letter(optent) optent[0] +#define optent_val(optent) optet_vals[optent] + +#define eflag optent_val(0) +#define fflag optent_val(1) +#define Iflag optent_val(2) +#define iflag optent_val(3) +#define mflag optent_val(4) +#define nflag optent_val(5) +#define sflag optent_val(6) +#define xflag optent_val(7) +#define vflag optent_val(8) +#define Vflag optent_val(9) +#define Eflag optent_val(10) +#define Cflag optent_val(11) +#define aflag optent_val(12) +#define bflag optent_val(13) +#define uflag optent_val(14) +#define qflag optent_val(15) + + +/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */ +#define FORK_FG 0 +#define FORK_BG 1 +#define FORK_NOJOB 2 + + +struct nbinary { + int type; + union node *ch1; + union node *ch2; +}; + + +struct ncmd { + int type; + int backgnd; + union node *assign; + union node *args; + union node *redirect; +}; + + +struct npipe { + int type; + int backgnd; + struct nodelist *cmdlist; +}; + + +struct nredir { + int type; + union node *n; + union node *redirect; +}; + + +struct nif { + int type; + union node *test; + union node *ifpart; + union node *elsepart; +}; + + +struct nfor { + int type; + union node *args; + union node *body; + char *var; +}; + + +struct ncase { + int type; + union node *expr; + union node *cases; +}; + + +struct nclist { + int type; + union node *next; + union node *pattern; + union node *body; +}; + + +struct narg { + int type; + union node *next; + char *text; + struct nodelist *backquote; +}; + + +struct nfile { + int type; + union node *next; + int fd; + union node *fname; + char *expfname; +}; + + +struct ndup { + int type; + union node *next; + int fd; + int dupfd; + union node *vname; +}; + + +struct nhere { + int type; + union node *next; + int fd; + union node *doc; +}; + + +struct nnot { + int type; + union node *com; +}; + + +union node { + int type; + struct nbinary nbinary; + struct ncmd ncmd; + struct npipe npipe; + struct nredir nredir; + struct nif nif; + struct nfor nfor; + struct ncase ncase; + struct nclist nclist; + struct narg narg; + struct nfile nfile; + struct ndup ndup; + struct nhere nhere; + struct nnot nnot; +}; + + +struct nodelist { + struct nodelist *next; + union node *n; +}; + +struct backcmd { /* result of evalbackcmd */ + int fd; /* file descriptor to read from */ + char *buf; /* buffer */ + int nleft; /* number of chars in buffer */ + struct job *jp; /* job structure for command */ +}; + +struct cmdentry { + int cmdtype; + union param { + int index; + union node *func; + const struct builtincmd *cmd; + } u; +}; + +struct strlist { + struct strlist *next; + char *text; +}; + + +struct arglist { + struct strlist *list; + struct strlist **lastp; +}; + +struct strpush { + struct strpush *prev; /* preceding string on stack */ + char *prevstring; + int prevnleft; +#ifdef ASH_ALIAS + struct alias *ap; /* if push was associated with an alias */ +#endif + char *string; /* remember the string since it may change */ +}; + +struct parsefile { + struct parsefile *prev; /* preceding file on stack */ + int linno; /* current line */ + int fd; /* file descriptor (or -1 if string) */ + int nleft; /* number of chars left in this line */ + int lleft; /* number of chars left in this buffer */ + char *nextc; /* next char in buffer */ + char *buf; /* input buffer */ + struct strpush *strpush; /* for pushing strings at this level */ + struct strpush basestrpush; /* so pushing one is fast */ +}; + +struct stackmark { + struct stack_block *stackp; + char *stacknxt; + int stacknleft; + struct stackmark *marknext; +}; + +struct shparam { + int nparam; /* # of positional parameters (without $0) */ + unsigned char malloc; /* if parameter list dynamically allocated */ + char **p; /* parameter list */ + int optind; /* next parameter to be processed by getopts */ + int optoff; /* used by getopts */ +}; + +/* + * When commands are first encountered, they are entered in a hash table. + * This ensures that a full path search will not have to be done for them + * on each invocation. + * + * We should investigate converting to a linear search, even though that + * would make the command name "hash" a misnomer. + */ +#define CMDTABLESIZE 31 /* should be prime */ +#define ARB 1 /* actual size determined at run time */ + + + +struct tblentry { + struct tblentry *next; /* next entry in hash chain */ + union param param; /* definition of builtin function */ + short cmdtype; /* index identifying command */ + char rehash; /* if set, cd done since entry created */ + char cmdname[ARB]; /* name of command */ +}; + + +static struct tblentry *cmdtable[CMDTABLESIZE]; +static int builtinloc = -1; /* index in path of %builtin, or -1 */ +static int exerrno = 0; /* Last exec error */ + + +static void tryexec (char *, char **, char **); +static void printentry (struct tblentry *, int); +static void clearcmdentry (int); +static struct tblentry *cmdlookup (const char *, int); +static void delete_cmd_entry (void); +static int path_change (const char *, int *); + + +static void flushall (void); +static void out2fmt (const char *, ...) + __attribute__((__format__(__printf__,1,2))); +static int xwrite (int, const char *, int); + +static void outstr (const char *p, FILE *file) { fputs(p, file); } +static void out1str(const char *p) { outstr(p, stdout); } +static void out2str(const char *p) { outstr(p, stderr); } + +#ifndef ASH_OPTIMIZE_FOR_SIZE +#define out2c(c) putc((c), stderr) +#else +static void out2c(int c) { putc(c, stderr); } +#endif + +/* syntax table used when not in quotes */ +static const char basesyntax[257] = { + CENDFILE, CSPCL, CWORD, CCTL, + CCTL, CCTL, CCTL, CCTL, + CCTL, CCTL, CCTL, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CSPCL, + CNL, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CSPCL, CWORD, + CDQUOTE, CWORD, CVAR, CWORD, + CSPCL, CSQUOTE, CSPCL, CSPCL, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CSPCL, CSPCL, CWORD, + CSPCL, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CBACK, CWORD, + CWORD, CWORD, CBQUOTE, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CSPCL, CENDVAR, + CWORD +}; + +/* syntax table used when in double quotes */ +static const char dqsyntax[257] = { + CENDFILE, CIGN, CWORD, CCTL, + CCTL, CCTL, CCTL, CCTL, + CCTL, CCTL, CCTL, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CNL, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CCTL, + CENDQUOTE,CWORD, CVAR, CWORD, + CWORD, CWORD, CWORD, CWORD, + CCTL, CWORD, CWORD, CCTL, + CWORD, CCTL, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CCTL, CWORD, CWORD, CCTL, + CWORD, CCTL, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CCTL, CBACK, CCTL, + CWORD, CWORD, CBQUOTE, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CENDVAR, + CCTL +}; + +/* syntax table used when in single quotes */ +static const char sqsyntax[257] = { + CENDFILE, CIGN, CWORD, CCTL, + CCTL, CCTL, CCTL, CCTL, + CCTL, CCTL, CCTL, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CNL, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CCTL, + CWORD, CWORD, CWORD, CWORD, + CWORD, CENDQUOTE,CWORD, CWORD, + CCTL, CWORD, CWORD, CCTL, + CWORD, CCTL, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CCTL, CWORD, CWORD, CCTL, + CWORD, CCTL, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CCTL, CCTL, CCTL, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CCTL +}; + +/* syntax table used when in arithmetic */ +static const char arisyntax[257] = { + CENDFILE, CIGN, CWORD, CCTL, + CCTL, CCTL, CCTL, CCTL, + CCTL, CCTL, CCTL, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CNL, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CDQUOTE, CWORD, CVAR, CWORD, + CWORD, CSQUOTE, CLP, CRP, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CBACK, CWORD, + CWORD, CWORD, CBQUOTE, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CWORD, + CWORD, CWORD, CWORD, CENDVAR, + CWORD +}; + +/* character classification table */ +static const char is_type[257] = { + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0, ISSPECL, + 0, ISSPECL, ISSPECL, 0, + 0, 0, 0, 0, + ISSPECL, 0, 0, ISSPECL, + 0, 0, ISDIGIT, ISDIGIT, + ISDIGIT, ISDIGIT, ISDIGIT, ISDIGIT, + ISDIGIT, ISDIGIT, ISDIGIT, ISDIGIT, + 0, 0, 0, 0, + 0, ISSPECL, ISSPECL, ISUPPER, + ISUPPER, ISUPPER, ISUPPER, ISUPPER, + ISUPPER, ISUPPER, ISUPPER, ISUPPER, + ISUPPER, ISUPPER, ISUPPER, ISUPPER, + ISUPPER, ISUPPER, ISUPPER, ISUPPER, + ISUPPER, ISUPPER, ISUPPER, ISUPPER, + ISUPPER, ISUPPER, ISUPPER, ISUPPER, + ISUPPER, 0, 0, 0, + 0, ISUNDER, 0, ISLOWER, + ISLOWER, ISLOWER, ISLOWER, ISLOWER, + ISLOWER, ISLOWER, ISLOWER, ISLOWER, + ISLOWER, ISLOWER, ISLOWER, ISLOWER, + ISLOWER, ISLOWER, ISLOWER, ISLOWER, + ISLOWER, ISLOWER, ISLOWER, ISLOWER, + ISLOWER, ISLOWER, ISLOWER, ISLOWER, + ISLOWER, 0, 0, 0, + 0 +}; + +/* Array indicating which tokens mark the end of a list */ +static const char tokendlist[] = { + 1, + 0, + 0, + 0, + 0, + 0, + 0, + 0, + 1, + 1, + 1, + 0, + 0, + 0, + 0, + 0, + 1, + 1, + 1, + 1, + 1, + 1, + 0, + 0, + 0, + 1, + 0, + 0, + 0, + 1, +}; + +static const char *const tokname[] = { + "end of file", + "newline", + "\";\"", + "\"&\"", + "\"&&\"", + "\"||\"", + "\"|\"", + "\"(\"", + "\")\"", + "\";;\"", + "\"`\"", + "redirection", + "word", + "assignment", + "\"!\"", + "\"case\"", + "\"do\"", + "\"done\"", + "\"elif\"", + "\"else\"", + "\"esac\"", + "\"fi\"", + "\"for\"", + "\"if\"", + "\"in\"", + "\"then\"", + "\"until\"", + "\"while\"", + "\"{\"", + "\"}\"", +}; + +#define KWDOFFSET 14 + +static const char *const parsekwd[] = { + "!", + "case", + "do", + "done", + "elif", + "else", + "esac", + "fi", + "for", + "if", + "in", + "then", + "until", + "while", + "{", + "}" +}; + + +static int plinno = 1; /* input line number */ + +static int parselleft; /* copy of parsefile->lleft */ + +static struct parsefile basepf; /* top level input file */ +static char basebuf[BUFSIZ]; /* buffer for top level input file */ +static struct parsefile *parsefile = &basepf; /* current input file */ + +/* + * NEOF is returned by parsecmd when it encounters an end of file. It + * must be distinct from NULL, so we use the address of a variable that + * happens to be handy. + */ + +static int tokpushback; /* last token pushed back */ +#define NEOF ((union node *)&tokpushback) +static int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */ + + +static void error (const char *, ...) __attribute__((__noreturn__)); +static void exerror (int, const char *, ...) __attribute__((__noreturn__)); +static void shellexec (char **, char **, const char *, int) + __attribute__((noreturn)); +static void exitshell (int) __attribute__((noreturn)); + +static int goodname(const char *); +static void ignoresig (int); +static void onsig (int); +static void dotrap (void); +static int decode_signal (const char *, int); + +static void shprocvar(void); +static void deletefuncs(void); +static void setparam (char **); +static void freeparam (volatile struct shparam *); + +/* reasons for skipping commands (see comment on breakcmd routine) */ +#define SKIPBREAK 1 +#define SKIPCONT 2 +#define SKIPFUNC 3 +#define SKIPFILE 4 + +/* values of cmdtype */ +#define CMDUNKNOWN -1 /* no entry in table for command */ +#define CMDNORMAL 0 /* command is an executable program */ +#define CMDBUILTIN 1 /* command is a shell builtin */ +#define CMDFUNCTION 2 /* command is a shell function */ + +#define DO_ERR 1 /* find_command prints errors */ +#define DO_ABS 2 /* find_command checks absolute paths */ +#define DO_NOFUN 4 /* find_command ignores functions */ +#define DO_BRUTE 8 /* find_command ignores hash table */ + +/* + * Shell variables. + */ + +/* flags */ +#define VEXPORT 0x01 /* variable is exported */ +#define VREADONLY 0x02 /* variable cannot be modified */ +#define VSTRFIXED 0x04 /* variable struct is staticly allocated */ +#define VTEXTFIXED 0x08 /* text is staticly allocated */ +#define VSTACK 0x10 /* text is allocated on the stack */ +#define VUNSET 0x20 /* the variable is not set */ +#define VNOFUNC 0x40 /* don't call the callback function */ + + +struct var { + struct var *next; /* next entry in hash list */ + int flags; /* flags are defined above */ + char *text; /* name=value */ + void (*func) (const char *); + /* function to be called when */ + /* the variable gets set/unset */ +}; + +struct localvar { + struct localvar *next; /* next local variable in list */ + struct var *vp; /* the variable that was made local */ + int flags; /* saved flags */ + char *text; /* saved text */ +}; + + +#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) +#define rmescapes(p) _rmescapes((p), 0) +static char *_rmescapes (char *, int); +#else +static void rmescapes (char *); +#endif + +static int casematch (union node *, const char *); +static void clearredir(void); +static void popstring(void); +static void readcmdfile (const char *); + +static int number (const char *); +static int is_number (const char *, int *num); +static char *single_quote (const char *); +static int nextopt (const char *); + +static void redirect (union node *, int); +static void popredir (void); +static int dup_as_newfd (int, int); + +static void changepath(const char *newval); +static void getoptsreset(const char *value); + + +static int parsenleft; /* copy of parsefile->nleft */ +static char *parsenextc; /* copy of parsefile->nextc */ +static int rootpid; /* pid of main shell */ +static int rootshell; /* true if we aren't a child of the main shell */ + +static const char spcstr[] = " "; +static const char snlfmt[] = "%s\n"; + +static int sstrnleft; +static int herefd = -1; + +static struct localvar *localvars; + +static struct var vifs; +static struct var vmail; +static struct var vmpath; +static struct var vpath; +static struct var vps1; +static struct var vps2; +static struct var voptind; +#ifdef BB_LOCALE_SUPPORT +static struct var vlc_all; +static struct var vlc_ctype; +#endif + +struct varinit { + struct var *var; + int flags; + const char *text; + void (*func) (const char *); +}; + +static const char defpathvar[] = + "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"; +#define defpath (defpathvar + 5) + +#ifdef IFS_BROKEN +static const char defifsvar[] = "IFS= \t\n"; +#define defifs (defifsvar + 4) +#else +static const char defifs[] = " \t\n"; +#endif + +static const struct varinit varinit[] = { +#ifdef IFS_BROKEN + { &vifs, VSTRFIXED|VTEXTFIXED, defifsvar, +#else + { &vifs, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS=", +#endif + NULL }, + { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=", + NULL }, + { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=", + NULL }, + { &vpath, VSTRFIXED|VTEXTFIXED, defpathvar, + changepath }, + /* + * vps1 depends on uid + */ + { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ", + NULL }, + { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1", + getoptsreset }, +#ifdef BB_LOCALE_SUPPORT + { &vlc_all, VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL=", + change_lc_all }, + { &vlc_ctype, VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE=", + change_lc_ctype }, +#endif + { NULL, 0, NULL, + NULL } +}; + +#define VTABSIZE 39 + +static struct var *vartab[VTABSIZE]; + +/* + * The following macros access the values of the above variables. + * They have to skip over the name. They return the null string + * for unset variables. + */ + +#define ifsval() (vifs.text + 4) +#define ifsset() ((vifs.flags & VUNSET) == 0) +#define mailval() (vmail.text + 5) +#define mpathval() (vmpath.text + 9) +#define pathval() (vpath.text + 5) +#define ps1val() (vps1.text + 4) +#define ps2val() (vps2.text + 4) +#define optindval() (voptind.text + 7) + +#define mpathset() ((vmpath.flags & VUNSET) == 0) + +static void initvar (void); +static void setvar (const char *, const char *, int); +static void setvareq (char *, int); +static void listsetvar (struct strlist *); +static const char *lookupvar (const char *); +static const char *bltinlookup (const char *); +static char **environment (void); +static int showvarscmd (int, char **); +static void mklocal (char *); +static void poplocalvars (void); +static int unsetvar (const char *); +static int varequal (const char *, const char *); + + +static char *arg0; /* value of $0 */ +static struct shparam shellparam; /* current positional parameters */ +static char **argptr; /* argument list for builtin commands */ +static char *optionarg; /* set by nextopt (like getopt) */ +static char *optptr; /* used by nextopt */ +static char *minusc; /* argument to -c option */ + + +#ifdef ASH_ALIAS + +#define ALIASINUSE 1 +#define ALIASDEAD 2 + +#define ATABSIZE 39 + +struct alias { + struct alias *next; + char *name; + char *val; + int flag; +}; + +static struct alias *atab[ATABSIZE]; + +static void setalias (char *, char *); +static struct alias **hashalias (const char *); +static struct alias *freealias (struct alias *); +static struct alias **__lookupalias (const char *); + +static void +setalias(name, val) + char *name, *val; +{ + struct alias *ap, **app; + + app = __lookupalias(name); + ap = *app; + INTOFF; + if (ap) { + if (!(ap->flag & ALIASINUSE)) { + ckfree(ap->val); + } + ap->val = savestr(val); + ap->flag &= ~ALIASDEAD; + } else { + /* not found */ + ap = ckmalloc(sizeof (struct alias)); + ap->name = savestr(name); + ap->val = savestr(val); + ap->flag = 0; + ap->next = 0; + *app = ap; + } + INTON; +} + +static int +unalias(char *name) +{ + struct alias **app; + + app = __lookupalias(name); + + if (*app) { + INTOFF; + *app = freealias(*app); + INTON; + return (0); + } + + return (1); +} + +static void +rmaliases(void) +{ + struct alias *ap, **app; + int i; + + INTOFF; + for (i = 0; i < ATABSIZE; i++) { + app = &atab[i]; + for (ap = *app; ap; ap = *app) { + *app = freealias(*app); + if (ap == *app) { + app = &ap->next; + } + } + } + INTON; +} + +static struct alias * +lookupalias(const char *name, int check) +{ + struct alias *ap = *__lookupalias(name); + + if (check && ap && (ap->flag & ALIASINUSE)) + return (NULL); + return (ap); +} + +static void +printalias(const struct alias *ap) { + char *p; + + p = single_quote(ap->val); + printf("alias %s=%s\n", ap->name, p); + stunalloc(p); +} + + +/* + * TODO - sort output + */ +static int +aliascmd(int argc, char **argv) +{ + char *n, *v; + int ret = 0; + struct alias *ap; + + if (argc == 1) { + int i; + + for (i = 0; i < ATABSIZE; i++) + for (ap = atab[i]; ap; ap = ap->next) { + printalias(ap); + } + return (0); + } + while ((n = *++argv) != NULL) { + if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */ + if ((ap = *__lookupalias(n)) == NULL) { + out2fmt("%s: %s not found\n", "alias", n); + ret = 1; + } else + printalias(ap); + } + else { + *v++ = '\0'; + setalias(n, v); + } + } + + return (ret); +} + +static int +unaliascmd(int argc, char **argv) +{ + int i; + + while ((i = nextopt("a")) != '\0') { + if (i == 'a') { + rmaliases(); + return (0); + } + } + for (i = 0; *argptr; argptr++) { + if (unalias(*argptr)) { + out2fmt("%s: %s not found\n", "unalias", *argptr); + i = 1; + } + } + + return (i); +} + +static struct alias ** +hashalias(p) + const char *p; + { + unsigned int hashval; + + hashval = *p << 4; + while (*p) + hashval+= *p++; + return &atab[hashval % ATABSIZE]; +} + +static struct alias * +freealias(struct alias *ap) { + struct alias *next; + + if (ap->flag & ALIASINUSE) { + ap->flag |= ALIASDEAD; + return ap; + } + + next = ap->next; + ckfree(ap->name); + ckfree(ap->val); + ckfree(ap); + return next; +} + + +static struct alias ** +__lookupalias(const char *name) { + struct alias **app = hashalias(name); + + for (; *app; app = &(*app)->next) { + if (equal(name, (*app)->name)) { + break; + } + } + + return app; +} +#endif + +#ifdef ASH_MATH_SUPPORT +/* The generated file arith.c has been replaced with a custom hand + * written implementation written by Aaron Lehmann <aaronl@vitelus.com>. + * This is now part of libbb, so that it can be used by all the shells + * in busybox. */ +#define ARITH_NUM 257 +#define ARITH_LPAREN 258 +#define ARITH_RPAREN 259 +#define ARITH_OR 260 +#define ARITH_AND 261 +#define ARITH_BOR 262 +#define ARITH_BXOR 263 +#define ARITH_BAND 264 +#define ARITH_EQ 265 +#define ARITH_NE 266 +#define ARITH_LT 267 +#define ARITH_GT 268 +#define ARITH_GE 269 +#define ARITH_LE 270 +#define ARITH_LSHIFT 271 +#define ARITH_RSHIFT 272 +#define ARITH_ADD 273 +#define ARITH_SUB 274 +#define ARITH_MUL 275 +#define ARITH_DIV 276 +#define ARITH_REM 277 +#define ARITH_UNARYMINUS 278 +#define ARITH_UNARYPLUS 279 +#define ARITH_NOT 280 +#define ARITH_BNOT 281 + +static void expari (int); +#endif + +static char *trap[NSIG]; /* trap handler commands */ +static char sigmode[NSIG - 1]; /* current value of signal */ +static char gotsig[NSIG - 1]; /* indicates specified signal received */ +static int pendingsigs; /* indicates some signal received */ + +/* + * This file was generated by the mkbuiltins program. + */ + +#ifdef JOBS +static int bgcmd (int, char **); +static int fgcmd (int, char **); +static int killcmd (int, char **); +#endif +static int bltincmd (int, char **); +static int cdcmd (int, char **); +static int breakcmd (int, char **); +#ifdef ASH_CMDCMD +static int commandcmd (int, char **); +#endif +static int dotcmd (int, char **); +static int evalcmd (int, char **); +static int execcmd (int, char **); +static int exitcmd (int, char **); +static int exportcmd (int, char **); +static int histcmd (int, char **); +static int hashcmd (int, char **); +static int helpcmd (int, char **); +static int jobscmd (int, char **); +static int localcmd (int, char **); +#ifndef BB_PWD +static int pwdcmd (int, char **); +#endif +static int readcmd (int, char **); +static int returncmd (int, char **); +static int setcmd (int, char **); +static int setvarcmd (int, char **); +static int shiftcmd (int, char **); +static int trapcmd (int, char **); +static int umaskcmd (int, char **); +#ifdef ASH_ALIAS +static int aliascmd (int, char **); +static int unaliascmd (int, char **); +#endif +static int unsetcmd (int, char **); +static int waitcmd (int, char **); +static int ulimitcmd (int, char **); +static int timescmd (int, char **); +#ifdef ASH_MATH_SUPPORT +static int letcmd (int, char **); +#endif +static int typecmd (int, char **); +#ifdef ASH_GETOPTS +static int getoptscmd (int, char **); +#endif + +#ifndef BB_TRUE_FALSE +static int true_main (int, char **); +static int false_main (int, char **); +#endif + +static void setpwd (const char *, int); + + +#define BUILTIN_NOSPEC "0" +#define BUILTIN_SPECIAL "1" +#define BUILTIN_REGULAR "2" +#define BUILTIN_ASSIGN "4" +#define BUILTIN_SPEC_ASSG "5" +#define BUILTIN_REG_ASSG "6" + +#define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1) +#define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2) +#define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4) + +struct builtincmd { + const char *name; + int (*const builtinfunc) (int, char **); + //unsigned flags; +}; + + +/* It is CRUCIAL that this listing be kept in ascii order, otherwise + * the binary search in find_builtin() will stop working. If you value + * your kneecaps, you'll be sure to *make sure* that any changes made + * to this array result in the listing remaining in ascii order. You + * have been warned. + */ +static const struct builtincmd builtincmds[] = { + { BUILTIN_SPECIAL ".", dotcmd }, /* first, see declare DOTCMD */ + { BUILTIN_SPECIAL ":", true_main }, +#ifdef ASH_ALIAS + { BUILTIN_REG_ASSG "alias", aliascmd }, +#endif +#ifdef JOBS + { BUILTIN_REGULAR "bg", bgcmd }, +#endif + { BUILTIN_SPECIAL "break", breakcmd }, + { BUILTIN_SPECIAL "builtin", bltincmd }, + { BUILTIN_REGULAR "cd", cdcmd }, + { BUILTIN_NOSPEC "chdir", cdcmd }, +#ifdef ASH_CMDCMD + { BUILTIN_REGULAR "command", commandcmd }, +#endif + { BUILTIN_SPECIAL "continue", breakcmd }, + { BUILTIN_SPECIAL "eval", evalcmd }, + { BUILTIN_SPECIAL "exec", execcmd }, + { BUILTIN_SPECIAL "exit", exitcmd }, + { BUILTIN_SPEC_ASSG "export", exportcmd }, + { BUILTIN_REGULAR "false", false_main }, + { BUILTIN_REGULAR "fc", histcmd }, +#ifdef JOBS + { BUILTIN_REGULAR "fg", fgcmd }, +#endif +#ifdef ASH_GETOPTS + { BUILTIN_REGULAR "getopts", getoptscmd }, +#endif + { BUILTIN_NOSPEC "hash", hashcmd }, + { BUILTIN_NOSPEC "help", helpcmd }, + { BUILTIN_REGULAR "jobs", jobscmd }, +#ifdef JOBS + { BUILTIN_REGULAR "kill", killcmd }, +#endif +#ifdef ASH_MATH_SUPPORT + { BUILTIN_REGULAR "let", letcmd }, +#endif + { BUILTIN_ASSIGN "local", localcmd }, +#ifndef BB_PWD + { BUILTIN_NOSPEC "pwd", pwdcmd }, +#endif + { BUILTIN_REGULAR "read", readcmd }, + { BUILTIN_SPEC_ASSG "readonly", exportcmd }, + { BUILTIN_SPECIAL "return", returncmd }, + { BUILTIN_SPECIAL "set", setcmd }, + { BUILTIN_NOSPEC "setvar", setvarcmd }, + { BUILTIN_SPECIAL "shift", shiftcmd }, + { BUILTIN_SPECIAL "times", timescmd }, + { BUILTIN_SPECIAL "trap", trapcmd }, + { BUILTIN_REGULAR "true", true_main }, + { BUILTIN_NOSPEC "type", typecmd }, + { BUILTIN_NOSPEC "ulimit", ulimitcmd }, + { BUILTIN_REGULAR "umask", umaskcmd }, +#ifdef ASH_ALIAS + { BUILTIN_REGULAR "unalias", unaliascmd }, +#endif + { BUILTIN_SPECIAL "unset", unsetcmd }, + { BUILTIN_REGULAR "wait", waitcmd }, +}; +#define NUMBUILTINS (sizeof (builtincmds) / sizeof (struct builtincmd) ) + +static const struct builtincmd *DOTCMD = &builtincmds[0]; +static struct builtincmd *BLTINCMD; +static struct builtincmd *EXECCMD; +static struct builtincmd *EVALCMD; + +/* states */ +#define JOBSTOPPED 1 /* all procs are stopped */ +#define JOBDONE 2 /* all procs are completed */ + +/* + * A job structure contains information about a job. A job is either a + * single process or a set of processes contained in a pipeline. In the + * latter case, pidlist will be non-NULL, and will point to a -1 terminated + * array of pids. + */ + +struct procstat { + pid_t pid; /* process id */ + int status; /* status flags (defined above) */ + char *cmd; /* text of command being run */ +}; + + +static int job_warning; /* user was warned about stopped jobs */ + +#ifdef JOBS +static void setjobctl(int enable); +#else +#define setjobctl(on) /* do nothing */ +#endif + + +struct job { + struct procstat ps0; /* status of process */ + struct procstat *ps; /* status or processes when more than one */ + short nprocs; /* number of processes */ + short pgrp; /* process group of this job */ + char state; /* true if job is finished */ + char used; /* true if this entry is in used */ + char changed; /* true if status has changed */ +#ifdef JOBS + char jobctl; /* job running under job control */ +#endif +}; + +static struct job *jobtab; /* array of jobs */ +static int njobs; /* size of array */ +static int backgndpid = -1; /* pid of last background process */ +#ifdef JOBS +static int initialpgrp; /* pgrp of shell on invocation */ +static int curjob; /* current job */ +static int jobctl; +#endif +static int intreceived; + +static struct job *makejob (const union node *, int); +static int forkshell (struct job *, const union node *, int); +static int waitforjob (struct job *); + +static int docd (char *, int); +static char *getcomponent (void); +static void updatepwd (const char *); +static void getpwd (void); + +static char *padvance (const char **, const char *); + +static char nullstr[1]; /* zero length string */ +static char *curdir = nullstr; /* current working directory */ +static char *cdcomppath; + +static int +cdcmd(argc, argv) + int argc; + char **argv; +{ + const char *dest; + const char *path; + char *p; + struct stat statb; + int print = 0; + + nextopt(nullstr); + if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME")) == NULL) + error("HOME not set"); + if (*dest == '\0') + dest = "."; + if (dest[0] == '-' && dest[1] == '\0') { + dest = bltinlookup("OLDPWD"); + if (!dest || !*dest) { + dest = curdir; + } + print = 1; + if (dest) + print = 1; + else + dest = "."; + } + if (*dest == '/' || (path = bltinlookup("CDPATH")) == NULL) + path = nullstr; + while ((p = padvance(&path, dest)) != NULL) { + if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { + if (!print) { + if (p[0] == '.' && p[1] == '/' && p[2] != '\0') + p += 2; + print = strcmp(p, dest); + } + if (docd(p, print) >= 0) + return 0; + + } + } + error("can't cd to %s", dest); + /* NOTREACHED */ +} + + +/* + * Actually do the chdir. In an interactive shell, print the + * directory name if "print" is nonzero. + */ + +static int +docd(dest, print) + char *dest; + int print; +{ + char *p; + char *q; + char *component; + struct stat statb; + int first; + int badstat; + + TRACE(("docd(\"%s\", %d) called\n", dest, print)); + + /* + * Check each component of the path. If we find a symlink or + * something we can't stat, clear curdir to force a getcwd() + * next time we get the value of the current directory. + */ + badstat = 0; + cdcomppath = sstrdup(dest); + STARTSTACKSTR(p); + if (*dest == '/') { + STPUTC('/', p); + cdcomppath++; + } + first = 1; + while ((q = getcomponent()) != NULL) { + if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0')) + continue; + if (! first) + STPUTC('/', p); + first = 0; + component = q; + while (*q) + STPUTC(*q++, p); + if (equal(component, "..")) + continue; + STACKSTRNUL(p); + if ((lstat(stackblock(), &statb) < 0) + || (S_ISLNK(statb.st_mode))) { + /* print = 1; */ + badstat = 1; + break; + } + } + + INTOFF; + if (chdir(dest) < 0) { + INTON; + return -1; + } + updatepwd(badstat ? NULL : dest); + INTON; + if (print && iflag) + printf(snlfmt, curdir); + return 0; +} + + +/* + * Get the next component of the path name pointed to by cdcomppath. + * This routine overwrites the string pointed to by cdcomppath. + */ + +static char * +getcomponent() { + char *p; + char *start; + + if ((p = cdcomppath) == NULL) + return NULL; + start = cdcomppath; + while (*p != '/' && *p != '\0') + p++; + if (*p == '\0') { + cdcomppath = NULL; + } else { + *p++ = '\0'; + cdcomppath = p; + } + return start; +} + + + +/* + * Update curdir (the name of the current directory) in response to a + * cd command. We also call hashcd to let the routines in exec.c know + * that the current directory has changed. + */ + +static void hashcd (void); + +static void +updatepwd(const char *dir) +{ + char *new; + char *p; + size_t len; + + hashcd(); /* update command hash table */ + + /* + * If our argument is NULL, we don't know the current directory + * any more because we traversed a symbolic link or something + * we couldn't stat(). + */ + if (dir == NULL || curdir == nullstr) { + setpwd(0, 1); + return; + } + len = strlen(dir); + cdcomppath = sstrdup(dir); + STARTSTACKSTR(new); + if (*dir != '/') { + p = curdir; + while (*p) + STPUTC(*p++, new); + if (p[-1] == '/') + STUNPUTC(new); + } + while ((p = getcomponent()) != NULL) { + if (equal(p, "..")) { + while (new > stackblock() && (STUNPUTC(new), *new) != '/'); + } else if (*p != '\0' && ! equal(p, ".")) { + STPUTC('/', new); + while (*p) + STPUTC(*p++, new); + } + } + if (new == stackblock()) + STPUTC('/', new); + STACKSTRNUL(new); + setpwd(stackblock(), 1); +} + + +#ifndef BB_PWD +static int +pwdcmd(argc, argv) + int argc; + char **argv; +{ + printf(snlfmt, curdir); + return 0; +} +#endif + +/* + * Find out what the current directory is. If we already know the current + * directory, this routine returns immediately. + */ +static void +getpwd(void) +{ + curdir = xgetcwd(0); + if(curdir==0) + curdir = nullstr; +} + +static void +setpwd(const char *val, int setold) +{ + if (setold) { + setvar("OLDPWD", curdir, VEXPORT); + } + INTOFF; + if (curdir != nullstr) { + free(curdir); + curdir = nullstr; + } + if (!val) { + getpwd(); + } else { + curdir = savestr(val); + } + INTON; + setvar("PWD", curdir, VEXPORT); +} + +/* + * Errors and exceptions. + */ + +/* + * Code to handle exceptions in C. + */ + +/* + * We enclose jmp_buf in a structure so that we can declare pointers to + * jump locations. The global variable handler contains the location to + * jump to when an exception occurs, and the global variable exception + * contains a code identifying the exeception. To implement nested + * exception handlers, the user should save the value of handler on entry + * to an inner scope, set handler to point to a jmploc structure for the + * inner scope, and restore handler on exit from the scope. + */ + +struct jmploc { + jmp_buf loc; +}; + +/* exceptions */ +#define EXINT 0 /* SIGINT received */ +#define EXERROR 1 /* a generic error */ +#define EXSHELLPROC 2 /* execute a shell procedure */ +#define EXEXEC 3 /* command execution failed */ + +static struct jmploc *handler; +static int exception; + +static void exverror (int, const char *, va_list) + __attribute__((__noreturn__)); + +/* + * Called to raise an exception. Since C doesn't include exceptions, we + * just do a longjmp to the exception handler. The type of exception is + * stored in the global variable "exception". + */ + +static void exraise (int) __attribute__((__noreturn__)); + +static void +exraise(int e) +{ +#ifdef DEBUG + if (handler == NULL) + abort(); +#endif + flushall(); + exception = e; + longjmp(handler->loc, 1); +} + + +/* + * Called from trap.c when a SIGINT is received. (If the user specifies + * that SIGINT is to be trapped or ignored using the trap builtin, then + * this routine is not called.) Suppressint is nonzero when interrupts + * are held using the INTOFF macro. The call to _exit is necessary because + * there is a short period after a fork before the signal handlers are + * set to the appropriate value for the child. (The test for iflag is + * just defensive programming.) + */ + +static void +onint(void) { + sigset_t mysigset; + + if (suppressint) { + intpending++; + return; + } + intpending = 0; + sigemptyset(&mysigset); + sigprocmask(SIG_SETMASK, &mysigset, NULL); + if (rootshell && iflag) + exraise(EXINT); + else { + signal(SIGINT, SIG_DFL); + raise(SIGINT); + } + /* NOTREACHED */ +} + + +static char *commandname; /* currently executing command */ + +/* + * Exverror is called to raise the error exception. If the first argument + * is not NULL then error prints an error message using printf style + * formatting. It then raises the error exception. + */ +static void +exverror(int cond, const char *msg, va_list ap) +{ + CLEAR_PENDING_INT; + INTOFF; + +#ifdef DEBUG + if (msg) + TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); + else + TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); +#endif + if (msg) { + if (commandname) + out2fmt("%s: ", commandname); + vfprintf(stderr, msg, ap); + out2c('\n'); + } + exraise(cond); + /* NOTREACHED */ +} + + +static void +error(const char *msg, ...) +{ + va_list ap; + va_start(ap, msg); + exverror(EXERROR, msg, ap); + /* NOTREACHED */ + va_end(ap); +} + + +static void +exerror(int cond, const char *msg, ...) +{ + va_list ap; + va_start(ap, msg); + exverror(cond, msg, ap); + /* NOTREACHED */ + va_end(ap); +} + + + +/* + * Table of error messages. + */ + +struct errname { + short errcode; /* error number */ + char action; /* operation which encountered the error */ +}; + +/* + * Types of operations (passed to the errmsg routine). + */ + +#define E_OPEN 01 /* opening a file */ +#define E_CREAT 02 /* creating a file */ +#define E_EXEC 04 /* executing a program */ + +#define ALL (E_OPEN|E_CREAT|E_EXEC) + +static const struct errname errormsg[] = { + { EINTR, ALL }, + { EACCES, ALL }, + { EIO, ALL }, + { ENOENT, E_OPEN }, + { ENOENT, E_CREAT }, + { ENOENT, E_EXEC }, + { ENOTDIR, E_OPEN }, + { ENOTDIR, E_CREAT }, + { ENOTDIR, E_EXEC }, + { EISDIR, ALL }, + { EEXIST, E_CREAT }, +#ifdef EMFILE + { EMFILE, ALL }, +#endif + { ENFILE, ALL }, + { ENOSPC, ALL }, +#ifdef EDQUOT + { EDQUOT, ALL }, +#endif +#ifdef ENOSR + { ENOSR, ALL }, +#endif + { ENXIO, ALL }, + { EROFS, ALL }, + { ETXTBSY, ALL }, +#ifdef EAGAIN + { EAGAIN, E_EXEC }, +#endif + { ENOMEM, ALL }, +#ifdef ENOLINK + { ENOLINK, ALL }, +#endif +#ifdef EMULTIHOP + { EMULTIHOP, ALL }, +#endif +#ifdef ECOMM + { ECOMM, ALL }, +#endif +#ifdef ESTALE + { ESTALE, ALL }, +#endif +#ifdef ETIMEDOUT + { ETIMEDOUT, ALL }, +#endif +#ifdef ELOOP + { ELOOP, ALL }, +#endif + { E2BIG, E_EXEC }, +#ifdef ELIBACC + { ELIBACC, E_EXEC }, +#endif +}; + +#define ERRNAME_SIZE (sizeof(errormsg)/sizeof(struct errname)) + +/* + * Return a string describing an error. The returned string may be a + * pointer to a static buffer that will be overwritten on the next call. + * Action describes the operation that got the error. + */ + +static const char * +errmsg(int e, int action) +{ + struct errname const *ep; + static char buf[12]; + + for (ep = errormsg ; ep < errormsg+ERRNAME_SIZE; ep++) { + if (ep->errcode == e && (ep->action & action) != 0) + return strerror(e); + } + + snprintf(buf, sizeof buf, "error %d", e); + return buf; +} + + +#ifdef ASH_OPTIMIZE_FOR_SIZE +static void +__inton() { + if (--suppressint == 0 && intpending) { + onint(); + } +} +static void forceinton (void) { + suppressint = 0; + if (intpending) + onint(); +} +#endif + +/* flags in argument to evaltree */ +#define EV_EXIT 01 /* exit after evaluating tree */ +#define EV_TESTED 02 /* exit status is checked; ignore -e flag */ +#define EV_BACKCMD 04 /* command executing within back quotes */ + +static int evalskip; /* set if we are skipping commands */ +static int skipcount; /* number of levels to skip */ +static int loopnest; /* current loop nesting level */ +static int funcnest; /* depth of function calls */ + + +static struct strlist *cmdenviron; /* environment for builtin command */ +static int exitstatus; /* exit status of last command */ +static int oexitstatus; /* saved exit status */ + +static void evalsubshell (const union node *, int); +static void expredir (union node *); +static void prehash (union node *); +static void eprintlist (struct strlist *); + +static union node *parsecmd(int); +/* + * Called to reset things after an exception. + */ + +/* + * The eval commmand. + */ +static void evalstring (char *, int); + +static int +evalcmd(argc, argv) + int argc; + char **argv; +{ + char *p; + char *concat; + char **ap; + + if (argc > 1) { + p = argv[1]; + if (argc > 2) { + STARTSTACKSTR(concat); + ap = argv + 2; + for (;;) { + while (*p) + STPUTC(*p++, concat); + if ((p = *ap++) == NULL) + break; + STPUTC(' ', concat); + } + STPUTC('\0', concat); + p = grabstackstr(concat); + } + evalstring(p, EV_TESTED); + } + return exitstatus; +} + +/* + * Execute a command or commands contained in a string. + */ + +static void evaltree (union node *, int); +static void setinputstring (char *); +static void popfile (void); +static void setstackmark(struct stackmark *mark); +static void popstackmark(struct stackmark *mark); + + +static void +evalstring(char *s, int flag) +{ + union node *n; + struct stackmark smark; + + setstackmark(&smark); + setinputstring(s); + while ((n = parsecmd(0)) != NEOF) { + evaltree(n, flag); + popstackmark(&smark); + } + popfile(); + popstackmark(&smark); +} + +static struct builtincmd *find_builtin (const char *); +static void expandarg (union node *, struct arglist *, int); +static void calcsize (const union node *); +static union node *copynode (const union node *); + +/* + * Make a copy of a parse tree. + */ + +static int funcblocksize; /* size of structures in function */ +static int funcstringsize; /* size of strings in node */ +static pointer funcblock; /* block to allocate function from */ +static char *funcstring; /* block to allocate strings from */ + + +static inline union node * +copyfunc(union node *n) +{ + if (n == NULL) + return NULL; + funcblocksize = 0; + funcstringsize = 0; + calcsize(n); + funcblock = ckmalloc(funcblocksize + funcstringsize); + funcstring = (char *) funcblock + funcblocksize; + return copynode(n); +} + +/* + * Free a parse tree. + */ + +static void +freefunc(union node *n) +{ + if (n) + ckfree(n); +} + + +/* + * Add a new command entry, replacing any existing command entry for + * the same name. + */ + +static inline void +addcmdentry(char *name, struct cmdentry *entry) +{ + struct tblentry *cmdp; + + INTOFF; + cmdp = cmdlookup(name, 1); + if (cmdp->cmdtype == CMDFUNCTION) { + freefunc(cmdp->param.func); + } + cmdp->cmdtype = entry->cmdtype; + cmdp->param = entry->u; + INTON; +} + +static inline void +evalloop(const union node *n, int flags) +{ + int status; + + loopnest++; + status = 0; + for (;;) { + evaltree(n->nbinary.ch1, EV_TESTED); + if (evalskip) { +skipping: if (evalskip == SKIPCONT && --skipcount <= 0) { + evalskip = 0; + continue; + } + if (evalskip == SKIPBREAK && --skipcount <= 0) + evalskip = 0; + break; + } + if (n->type == NWHILE) { + if (exitstatus != 0) + break; + } else { + if (exitstatus == 0) + break; + } + evaltree(n->nbinary.ch2, flags & EV_TESTED); + status = exitstatus; + if (evalskip) + goto skipping; + } + loopnest--; + exitstatus = status; +} + +static void +evalfor(const union node *n, int flags) +{ + struct arglist arglist; + union node *argp; + struct strlist *sp; + struct stackmark smark; + + setstackmark(&smark); + arglist.lastp = &arglist.list; + for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { + oexitstatus = exitstatus; + expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD); + if (evalskip) + goto out; + } + *arglist.lastp = NULL; + + exitstatus = 0; + loopnest++; + for (sp = arglist.list ; sp ; sp = sp->next) { + setvar(n->nfor.var, sp->text, 0); + evaltree(n->nfor.body, flags & EV_TESTED); + if (evalskip) { + if (evalskip == SKIPCONT && --skipcount <= 0) { + evalskip = 0; + continue; + } + if (evalskip == SKIPBREAK && --skipcount <= 0) + evalskip = 0; + break; + } + } + loopnest--; +out: + popstackmark(&smark); +} + +static inline void +evalcase(const union node *n, int flags) +{ + union node *cp; + union node *patp; + struct arglist arglist; + struct stackmark smark; + + setstackmark(&smark); + arglist.lastp = &arglist.list; + oexitstatus = exitstatus; + expandarg(n->ncase.expr, &arglist, EXP_TILDE); + for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) { + for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) { + if (casematch(patp, arglist.list->text)) { + if (evalskip == 0) { + evaltree(cp->nclist.body, flags); + } + goto out; + } + } + } +out: + popstackmark(&smark); +} + +/* + * Evaluate a pipeline. All the processes in the pipeline are children + * of the process creating the pipeline. (This differs from some versions + * of the shell, which make the last process in a pipeline the parent + * of all the rest.) + */ + +static inline void +evalpipe(n) + union node *n; +{ + struct job *jp; + struct nodelist *lp; + int pipelen; + int prevfd; + int pip[2]; + + TRACE(("evalpipe(0x%lx) called\n", (long)n)); + pipelen = 0; + for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) + pipelen++; + INTOFF; + jp = makejob(n, pipelen); + prevfd = -1; + for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { + prehash(lp->n); + pip[1] = -1; + if (lp->next) { + if (pipe(pip) < 0) { + close(prevfd); + error("Pipe call failed"); + } + } + if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { + INTON; + if (prevfd > 0) { + close(0); + dup_as_newfd(prevfd, 0); + close(prevfd); + if (pip[0] == 0) { + pip[0] = -1; + } + } + if (pip[1] >= 0) { + if (pip[0] >= 0) { + close(pip[0]); + } + if (pip[1] != 1) { + close(1); + dup_as_newfd(pip[1], 1); + close(pip[1]); + } + } + evaltree(lp->n, EV_EXIT); + } + if (prevfd >= 0) + close(prevfd); + prevfd = pip[0]; + close(pip[1]); + } + INTON; + if (n->npipe.backgnd == 0) { + INTOFF; + exitstatus = waitforjob(jp); + TRACE(("evalpipe: job done exit status %d\n", exitstatus)); + INTON; + } +} + +static void find_command (const char *, struct cmdentry *, int, const char *); + +static int +isassignment(const char *word) { + if (!is_name(*word)) { + return 0; + } + do { + word++; + } while (is_in_name(*word)); + return *word == '='; +} + + +static void +evalcommand(union node *cmd, int flags) +{ + struct stackmark smark; + union node *argp; + struct arglist arglist; + struct arglist varlist; + char **argv; + int argc; + char **envp; + struct strlist *sp; + int mode; + struct cmdentry cmdentry; + struct job *jp; + char *volatile savecmdname; + volatile struct shparam saveparam; + struct localvar *volatile savelocalvars; + volatile int e; + char *lastarg; + const char *path; + const struct builtincmd *firstbltin; + struct jmploc *volatile savehandler; + struct jmploc jmploc; +#if __GNUC__ + /* Avoid longjmp clobbering */ + (void) &argv; + (void) &argc; + (void) &lastarg; + (void) &flags; +#endif + + /* First expand the arguments. */ + TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags)); + setstackmark(&smark); + arglist.lastp = &arglist.list; + varlist.lastp = &varlist.list; + arglist.list = 0; + oexitstatus = exitstatus; + exitstatus = 0; + path = pathval(); + for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) { + expandarg(argp, &varlist, EXP_VARTILDE); + } + for ( + argp = cmd->ncmd.args; argp && !arglist.list; + argp = argp->narg.next + ) { + expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); + } + if (argp) { + struct builtincmd *bcmd; + int pseudovarflag; + bcmd = find_builtin(arglist.list->text); + pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd); + for (; argp; argp = argp->narg.next) { + if (pseudovarflag && isassignment(argp->narg.text)) { + expandarg(argp, &arglist, EXP_VARTILDE); + continue; + } + expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); + } + } + *arglist.lastp = NULL; + *varlist.lastp = NULL; + expredir(cmd->ncmd.redirect); + argc = 0; + for (sp = arglist.list ; sp ; sp = sp->next) + argc++; + argv = stalloc(sizeof (char *) * (argc + 1)); + + for (sp = arglist.list ; sp ; sp = sp->next) { + TRACE(("evalcommand arg: %s\n", sp->text)); + *argv++ = sp->text; + } + *argv = NULL; + lastarg = NULL; + if (iflag && funcnest == 0 && argc > 0) + lastarg = argv[-1]; + argv -= argc; + + /* Print the command if xflag is set. */ + if (xflag) { + out2c('+'); + eprintlist(varlist.list); + eprintlist(arglist.list); + out2c('\n'); + } + + /* Now locate the command. */ + if (argc == 0) { + cmdentry.cmdtype = CMDBUILTIN; + firstbltin = cmdentry.u.cmd = BLTINCMD; + } else { + const char *oldpath; + int findflag = DO_ERR; + int oldfindflag; + + /* + * Modify the command lookup path, if a PATH= assignment + * is present + */ + for (sp = varlist.list ; sp ; sp = sp->next) + if (varequal(sp->text, defpathvar)) { + path = sp->text + 5; + findflag |= DO_BRUTE; + } + oldpath = path; + oldfindflag = findflag; + firstbltin = 0; + for(;;) { + find_command(argv[0], &cmdentry, findflag, path); + if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */ + exitstatus = 127; + goto out; + } + /* implement bltin and command here */ + if (cmdentry.cmdtype != CMDBUILTIN) { + break; + } + if (!firstbltin) { + firstbltin = cmdentry.u.cmd; + } + if (cmdentry.u.cmd == BLTINCMD) { + for(;;) { + struct builtincmd *bcmd; + + argv++; + if (--argc == 0) + goto found; + if (!(bcmd = find_builtin(*argv))) { + out2fmt("%s: not found\n", *argv); + exitstatus = 127; + goto out; + } + cmdentry.u.cmd = bcmd; + if (bcmd != BLTINCMD) + break; + } + } + if (cmdentry.u.cmd == find_builtin("command")) { + argv++; + if (--argc == 0) { + goto found; + } + if (*argv[0] == '-') { + if (!equal(argv[0], "-p")) { + argv--; + argc++; + break; + } + argv++; + if (--argc == 0) { + goto found; + } + path = defpath; + findflag |= DO_BRUTE; + } else { + path = oldpath; + findflag = oldfindflag; + } + findflag |= DO_NOFUN; + continue; + } +found: + break; + } + } + + /* Fork off a child process if necessary. */ + if (cmd->ncmd.backgnd + || (cmdentry.cmdtype == CMDNORMAL && (flags & EV_EXIT) == 0) + ) { + jp = makejob(cmd, 1); + mode = cmd->ncmd.backgnd; + if (forkshell(jp, cmd, mode) != 0) + goto parent; /* at end of routine */ + flags |= EV_EXIT; + } + + /* This is the child process if a fork occurred. */ + /* Execute the command. */ + if (cmdentry.cmdtype == CMDFUNCTION) { +#ifdef DEBUG + trputs("Shell function: "); trargs(argv); +#endif + exitstatus = oexitstatus; + redirect(cmd->ncmd.redirect, REDIR_PUSH); + saveparam = shellparam; + shellparam.malloc = 0; + shellparam.nparam = argc - 1; + shellparam.p = argv + 1; + INTOFF; + savelocalvars = localvars; + localvars = NULL; + INTON; + if (setjmp(jmploc.loc)) { + if (exception == EXSHELLPROC) { + freeparam((volatile struct shparam *) + &saveparam); + } else { + saveparam.optind = shellparam.optind; + saveparam.optoff = shellparam.optoff; + freeparam(&shellparam); + shellparam = saveparam; + } + poplocalvars(); + localvars = savelocalvars; + handler = savehandler; + longjmp(handler->loc, 1); + } + savehandler = handler; + handler = &jmploc; + for (sp = varlist.list ; sp ; sp = sp->next) + mklocal(sp->text); + funcnest++; + evaltree(cmdentry.u.func, flags & EV_TESTED); + funcnest--; + INTOFF; + poplocalvars(); + localvars = savelocalvars; + saveparam.optind = shellparam.optind; + saveparam.optoff = shellparam.optoff; + freeparam(&shellparam); + shellparam = saveparam; + handler = savehandler; + popredir(); + INTON; + if (evalskip == SKIPFUNC) { + evalskip = 0; + skipcount = 0; + } + if (flags & EV_EXIT) + exitshell(exitstatus); + } else if (cmdentry.cmdtype == CMDBUILTIN) { +#ifdef DEBUG + trputs("builtin command: "); trargs(argv); +#endif + mode = (cmdentry.u.cmd == EXECCMD)? 0 : REDIR_PUSH; + redirect(cmd->ncmd.redirect, mode); + savecmdname = commandname; + if (IS_BUILTIN_SPECIAL(firstbltin)) { + listsetvar(varlist.list); + } else { + cmdenviron = varlist.list; + } + e = -1; + if (setjmp(jmploc.loc)) { + e = exception; + exitstatus = (e == EXINT)? SIGINT+128 : 2; + goto cmddone; + } + savehandler = handler; + handler = &jmploc; + commandname = argv[0]; + argptr = argv + 1; + optptr = NULL; /* initialize nextopt */ + exitstatus = (*cmdentry.u.cmd->builtinfunc)(argc, argv); + flushall(); +cmddone: + cmdenviron = NULL; + if (e != EXSHELLPROC) { + commandname = savecmdname; + if (flags & EV_EXIT) + exitshell(exitstatus); + } + handler = savehandler; + if (e != -1) { + if ((e != EXERROR && e != EXEXEC) + || cmdentry.u.cmd == BLTINCMD + || cmdentry.u.cmd == DOTCMD + || cmdentry.u.cmd == EVALCMD + || cmdentry.u.cmd == EXECCMD) + exraise(e); + FORCEINTON; + } + if (cmdentry.u.cmd != EXECCMD) + popredir(); + } else { +#ifdef DEBUG + trputs("normal command: "); trargs(argv); +#endif + redirect(cmd->ncmd.redirect, 0); + clearredir(); + for (sp = varlist.list ; sp ; sp = sp->next) + setvareq(sp->text, VEXPORT|VSTACK); + envp = environment(); + shellexec(argv, envp, path, cmdentry.u.index); + } + goto out; + +parent: /* parent process gets here (if we forked) */ + if (mode == 0) { /* argument to fork */ + INTOFF; + exitstatus = waitforjob(jp); + INTON; + } + +out: + if (lastarg) + setvar("_", lastarg, 0); + popstackmark(&smark); +} + +/* + * Evaluate a parse tree. The value is left in the global variable + * exitstatus. + */ +static void +evaltree(n, flags) + union node *n; + int flags; +{ + int checkexit = 0; + if (n == NULL) { + TRACE(("evaltree(NULL) called\n")); + goto out; + } + TRACE(("evaltree(0x%lx: %d) called\n", (long)n, n->type)); + switch (n->type) { + case NSEMI: + evaltree(n->nbinary.ch1, flags & EV_TESTED); + if (evalskip) + goto out; + evaltree(n->nbinary.ch2, flags); + break; + case NAND: + evaltree(n->nbinary.ch1, EV_TESTED); + if (evalskip || exitstatus != 0) + goto out; + evaltree(n->nbinary.ch2, flags); + break; + case NOR: + evaltree(n->nbinary.ch1, EV_TESTED); + if (evalskip || exitstatus == 0) + goto out; + evaltree(n->nbinary.ch2, flags); + break; + case NREDIR: + expredir(n->nredir.redirect); + redirect(n->nredir.redirect, REDIR_PUSH); + evaltree(n->nredir.n, flags); + popredir(); + break; + case NSUBSHELL: + evalsubshell(n, flags); + break; + case NBACKGND: + evalsubshell(n, flags); + break; + case NIF: { + evaltree(n->nif.test, EV_TESTED); + if (evalskip) + goto out; + if (exitstatus == 0) + evaltree(n->nif.ifpart, flags); + else if (n->nif.elsepart) + evaltree(n->nif.elsepart, flags); + else + exitstatus = 0; + break; + } + case NWHILE: + case NUNTIL: + evalloop(n, flags); + break; + case NFOR: + evalfor(n, flags); + break; + case NCASE: + evalcase(n, flags); + break; + case NDEFUN: { + struct builtincmd *bcmd; + struct cmdentry entry; + if ( + (bcmd = find_builtin(n->narg.text)) && + IS_BUILTIN_SPECIAL(bcmd) + ) { + out2fmt("%s is a special built-in\n", n->narg.text); + exitstatus = 1; + break; + } + entry.cmdtype = CMDFUNCTION; + entry.u.func = copyfunc(n->narg.next); + addcmdentry(n->narg.text, &entry); + exitstatus = 0; + break; + } + case NNOT: + evaltree(n->nnot.com, EV_TESTED); + exitstatus = !exitstatus; + break; + + case NPIPE: + evalpipe(n); + checkexit = 1; + break; + case NCMD: + evalcommand(n, flags); + checkexit = 1; + break; +#ifdef DEBUG + default: + printf("Node type = %d\n", n->type); + break; +#endif + } +out: + if (pendingsigs) + dotrap(); + if ( + flags & EV_EXIT || + (checkexit && eflag && exitstatus && !(flags & EV_TESTED)) + ) + exitshell(exitstatus); +} + +/* + * Kick off a subshell to evaluate a tree. + */ + +static void +evalsubshell(const union node *n, int flags) +{ + struct job *jp; + int backgnd = (n->type == NBACKGND); + + expredir(n->nredir.redirect); + jp = makejob(n, 1); + if (forkshell(jp, n, backgnd) == 0) { + if (backgnd) + flags &=~ EV_TESTED; + redirect(n->nredir.redirect, 0); + evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ + } + if (! backgnd) { + INTOFF; + exitstatus = waitforjob(jp); + INTON; + } +} + +/* + * Compute the names of the files in a redirection list. + */ + +static void fixredir(union node *n, const char *text, int err); + +static void +expredir(union node *n) +{ + union node *redir; + + for (redir = n ; redir ; redir = redir->nfile.next) { + struct arglist fn; + fn.lastp = &fn.list; + oexitstatus = exitstatus; + switch (redir->type) { + case NFROMTO: + case NFROM: + case NTO: + case NAPPEND: + case NTOOV: + expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); + redir->nfile.expfname = fn.list->text; + break; + case NFROMFD: + case NTOFD: + if (redir->ndup.vname) { + expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE); + fixredir(redir, fn.list->text, 1); + } + break; + } + } +} + + +/* + * Execute a command inside back quotes. If it's a builtin command, we + * want to save its output in a block obtained from malloc. Otherwise + * we fork off a subprocess and get the output of the command via a pipe. + * Should be called with interrupts off. + */ + +static void +evalbackcmd(union node *n, struct backcmd *result) +{ + int pip[2]; + struct job *jp; + struct stackmark smark; /* unnecessary */ + + setstackmark(&smark); + result->fd = -1; + result->buf = NULL; + result->nleft = 0; + result->jp = NULL; + if (n == NULL) { + exitstatus = 0; + goto out; + } + exitstatus = 0; + if (pipe(pip) < 0) + error("Pipe call failed"); + jp = makejob(n, 1); + if (forkshell(jp, n, FORK_NOJOB) == 0) { + FORCEINTON; + close(pip[0]); + if (pip[1] != 1) { + close(1); + dup_as_newfd(pip[1], 1); + close(pip[1]); + } + eflag = 0; + evaltree(n, EV_EXIT); + } + close(pip[1]); + result->fd = pip[0]; + result->jp = jp; +out: + popstackmark(&smark); + TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n", + result->fd, result->buf, result->nleft, result->jp)); +} + + +/* + * Execute a simple command. + */ + +/* + * Search for a command. This is called before we fork so that the + * location of the command will be available in the parent as well as + * the child. The check for "goodname" is an overly conservative + * check that the name will not be subject to expansion. + */ + +static void +prehash(n) + union node *n; +{ + struct cmdentry entry; + + if (n->type == NCMD && n->ncmd.args) + if (goodname(n->ncmd.args->narg.text)) + find_command(n->ncmd.args->narg.text, &entry, 0, + pathval()); +} + + +/* + * Builtin commands. Builtin commands whose functions are closely + * tied to evaluation are implemented here. + */ + +/* + * No command given, or a bltin command with no arguments. Set the + * specified variables. + */ + +int +bltincmd(argc, argv) + int argc; + char **argv; +{ + /* + * Preserve exitstatus of a previous possible redirection + * as POSIX mandates + */ + return exitstatus; +} + + +/* + * Handle break and continue commands. Break, continue, and return are + * all handled by setting the evalskip flag. The evaluation routines + * above all check this flag, and if it is set they start skipping + * commands rather than executing them. The variable skipcount is + * the number of loops to break/continue, or the number of function + * levels to return. (The latter is always 1.) It should probably + * be an error to break out of more loops than exist, but it isn't + * in the standard shell so we don't make it one here. + */ + +static int +breakcmd(argc, argv) + int argc; + char **argv; +{ + int n = argc > 1 ? number(argv[1]) : 1; + + if (n > loopnest) + n = loopnest; + if (n > 0) { + evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; + skipcount = n; + } + return 0; +} + + +/* + * The return command. + */ + +static int +returncmd(argc, argv) + int argc; + char **argv; +{ + int ret = argc > 1 ? number(argv[1]) : oexitstatus; + + if (funcnest) { + evalskip = SKIPFUNC; + skipcount = 1; + return ret; + } + else { + /* Do what ksh does; skip the rest of the file */ + evalskip = SKIPFILE; + skipcount = 1; + return ret; + } +} + + +#ifndef BB_TRUE_FALSE +static int +false_main(argc, argv) + int argc; + char **argv; +{ + return 1; +} + + +static int +true_main(argc, argv) + int argc; + char **argv; +{ + return 0; +} +#endif + +/* + * Controls whether the shell is interactive or not. + */ + +static void setsignal(int signo); +static void chkmail(int silent); + + +static void +setinteractive(int on) +{ + static int is_interactive; + static int do_banner=0; + + if (on == is_interactive) + return; + setsignal(SIGINT); + setsignal(SIGQUIT); + setsignal(SIGTERM); + chkmail(1); + is_interactive = on; + if (do_banner==0 && is_interactive) { + /* Looks like they want an interactive shell */ + printf( "\n\n" BB_BANNER " Built-in shell (ash)\n"); + printf( "Enter 'help' for a list of built-in commands.\n\n"); + do_banner=1; + } +} + +static void +optschanged(void) +{ + setinteractive(iflag); + setjobctl(mflag); +} + + +static int +execcmd(argc, argv) + int argc; + char **argv; +{ + if (argc > 1) { + struct strlist *sp; + + iflag = 0; /* exit on error */ + mflag = 0; + optschanged(); + for (sp = cmdenviron; sp ; sp = sp->next) + setvareq(sp->text, VEXPORT|VSTACK); + shellexec(argv + 1, environment(), pathval(), 0); + } + return 0; +} + +static void +eprintlist(struct strlist *sp) +{ + for (; sp; sp = sp->next) { + out2fmt(" %s",sp->text); + } +} + +/* + * Exec a program. Never returns. If you change this routine, you may + * have to change the find_command routine as well. + */ + +static const char *pathopt; /* set by padvance */ + +static void +shellexec(argv, envp, path, idx) + char **argv, **envp; + const char *path; + int idx; +{ + char *cmdname; + int e; + + if (strchr(argv[0], '/') != NULL) { + tryexec(argv[0], argv, envp); + e = errno; + } else { + e = ENOENT; + while ((cmdname = padvance(&path, argv[0])) != NULL) { + if (--idx < 0 && pathopt == NULL) { + tryexec(cmdname, argv, envp); + if (errno != ENOENT && errno != ENOTDIR) + e = errno; + } + stunalloc(cmdname); + } + } + + /* Map to POSIX errors */ + switch (e) { + case EACCES: + exerrno = 126; + break; + case ENOENT: + exerrno = 127; + break; + default: + exerrno = 2; + break; + } + exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC)); + /* NOTREACHED */ +} + +/* + * Clear traps on a fork. + */ +static void +clear_traps(void) { + char **tp; + + for (tp = trap ; tp < &trap[NSIG] ; tp++) { + if (*tp && **tp) { /* trap not NULL or SIG_IGN */ + INTOFF; + ckfree(*tp); + *tp = NULL; + if (tp != &trap[0]) + setsignal(tp - trap); + INTON; + } + } +} + + +static void +initshellproc(void) { + +#ifdef ASH_ALIAS + /* from alias.c: */ + { + rmaliases(); + } +#endif + /* from eval.c: */ + { + exitstatus = 0; + } + + /* from exec.c: */ + { + deletefuncs(); + } + + /* from jobs.c: */ + { + backgndpid = -1; +#ifdef JOBS + jobctl = 0; +#endif + } + + /* from options.c: */ + { + int i; + + for (i = 0; i < NOPTS; i++) + optent_val(i) = 0; + optschanged(); + + } + + /* from redir.c: */ + { + clearredir(); + } + + /* from trap.c: */ + { + char *sm; + + clear_traps(); + for (sm = sigmode ; sm < sigmode + NSIG - 1; sm++) { + if (*sm == S_IGN) + *sm = S_HARD_IGN; + } + } + + /* from var.c: */ + { + shprocvar(); + } +} + +static int preadbuffer(void); +static void pushfile (void); + +/* + * Read a character from the script, returning PEOF on end of file. + * Nul characters in the input are silently discarded. + */ + +#ifndef ASH_OPTIMIZE_FOR_SIZE +#define pgetc_macro() (--parsenleft >= 0? *parsenextc++ : preadbuffer()) +static int +pgetc(void) +{ + return pgetc_macro(); +} +#else +static int +pgetc_macro(void) +{ + return --parsenleft >= 0? *parsenextc++ : preadbuffer(); +} + +static inline int +pgetc(void) +{ + return pgetc_macro(); +} +#endif + + +/* + * Undo the last call to pgetc. Only one character may be pushed back. + * PEOF may be pushed back. + */ + +static void +pungetc() { + parsenleft++; + parsenextc--; +} + + +static void +popfile(void) { + struct parsefile *pf = parsefile; + + INTOFF; + if (pf->fd >= 0) + close(pf->fd); + if (pf->buf) + ckfree(pf->buf); + while (pf->strpush) + popstring(); + parsefile = pf->prev; + ckfree(pf); + parsenleft = parsefile->nleft; + parselleft = parsefile->lleft; + parsenextc = parsefile->nextc; + plinno = parsefile->linno; + INTON; +} + + +/* + * Return to top level. + */ + +static void +popallfiles(void) { + while (parsefile != &basepf) + popfile(); +} + +/* + * Close the file(s) that the shell is reading commands from. Called + * after a fork is done. + */ + +static void +closescript() { + popallfiles(); + if (parsefile->fd > 0) { + close(parsefile->fd); + parsefile->fd = 0; + } +} + + +/* + * Like setinputfile, but takes an open file descriptor. Call this with + * interrupts off. + */ + +static void +setinputfd(fd, push) + int fd, push; +{ + (void) fcntl(fd, F_SETFD, FD_CLOEXEC); + if (push) { + pushfile(); + parsefile->buf = 0; + } else { + closescript(); + while (parsefile->strpush) + popstring(); + } + parsefile->fd = fd; + if (parsefile->buf == NULL) + parsefile->buf = ckmalloc(BUFSIZ); + parselleft = parsenleft = 0; + plinno = 1; +} + + +/* + * Set the input to take input from a file. If push is set, push the + * old input onto the stack first. + */ + +static void +setinputfile(const char *fname, int push) +{ + int fd; + int myfileno2; + + INTOFF; + if ((fd = open(fname, O_RDONLY)) < 0) + error("Can't open %s", fname); + if (fd < 10) { + myfileno2 = dup_as_newfd(fd, 10); + close(fd); + if (myfileno2 < 0) + error("Out of file descriptors"); + fd = myfileno2; + } + setinputfd(fd, push); + INTON; +} + + +static void +tryexec(char *cmd, char **argv, char **envp) +{ + int e; + +#ifdef BB_FEATURE_SH_STANDALONE_SHELL + char *name = cmd; + char** argv_l=argv; + int argc_l; +#ifdef BB_FEATURE_SH_APPLETS_ALWAYS_WIN + name = get_last_path_component(name); +#endif + argv_l=envp; + for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++) + putenv(*argv_l); + argv_l=argv; + for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++) + optind = 1; + run_applet_by_name(name, argc_l, argv); +#endif + execve(cmd, argv, envp); + e = errno; + if (e == ENOEXEC) { + INTOFF; + initshellproc(); + setinputfile(cmd, 0); + commandname = arg0 = savestr(argv[0]); + setparam(argv + 1); + exraise(EXSHELLPROC); + } + errno = e; +} + +static char *commandtext (const union node *); + +/* + * Do a path search. The variable path (passed by reference) should be + * set to the start of the path before the first call; padvance will update + * this value as it proceeds. Successive calls to padvance will return + * the possible path expansions in sequence. If an option (indicated by + * a percent sign) appears in the path entry then the global variable + * pathopt will be set to point to it; otherwise pathopt will be set to + * NULL. + */ + +static const char *pathopt; + +static void growstackblock(void); + + +static char * +padvance(const char **path, const char *name) +{ + const char *p; + char *q; + const char *start; + int len; + + if (*path == NULL) + return NULL; + start = *path; + for (p = start ; *p && *p != ':' && *p != '%' ; p++); + len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */ + while (stackblocksize() < len) + growstackblock(); + q = stackblock(); + if (p != start) { + memcpy(q, start, p - start); + q += p - start; + *q++ = '/'; + } + strcpy(q, name); + pathopt = NULL; + if (*p == '%') { + pathopt = ++p; + while (*p && *p != ':') p++; + } + if (*p == ':') + *path = p + 1; + else + *path = NULL; + return stalloc(len); +} + +/* + * Wrapper around strcmp for qsort/bsearch/... + */ +static int +pstrcmp(const void *a, const void *b) +{ + return strcmp((const char *) a, *(const char *const *) b); +} + +/* + * Find a keyword is in a sorted array. + */ + +static const char *const * +findkwd(const char *s) +{ + return bsearch(s, parsekwd, sizeof(parsekwd) / sizeof(const char *), + sizeof(const char *), pstrcmp); +} + + +/*** Command hashing code ***/ + + +static int +hashcmd(argc, argv) + int argc; + char **argv; +{ + struct tblentry **pp; + struct tblentry *cmdp; + int c; + int verbose; + struct cmdentry entry; + char *name; +#ifdef ASH_ALIAS + const struct alias *ap; +#endif + + verbose = 0; + while ((c = nextopt("rvV")) != '\0') { + if (c == 'r') { + clearcmdentry(0); + return 0; + } else if (c == 'v' || c == 'V') { + verbose = c; + } + } + if (*argptr == NULL) { + for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) { + for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) { + if (cmdp->cmdtype != CMDBUILTIN) { + printentry(cmdp, verbose); + } + } + } + return 0; + } + c = 0; + while ((name = *argptr++) != NULL) { + if ((cmdp = cmdlookup(name, 0)) != NULL + && (cmdp->cmdtype == CMDNORMAL + || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))) + delete_cmd_entry(); +#ifdef ASH_ALIAS + /* Then look at the aliases */ + if ((ap = lookupalias(name, 0)) != NULL) { + if (verbose=='v') + printf("%s is an alias for %s\n", name, ap->val); + else + printalias(ap); + continue; + } +#endif + /* First look at the keywords */ + if (findkwd(name)!=0) { + if (verbose=='v') + printf("%s is a shell keyword\n", name); + else + printf(snlfmt, name); + continue; + } + + find_command(name, &entry, DO_ERR, pathval()); + if (entry.cmdtype == CMDUNKNOWN) c = 1; + else if (verbose) { + cmdp = cmdlookup(name, 0); + if (cmdp) printentry(cmdp, verbose=='v'); + flushall(); + } + } + return c; +} + +static void +printentry(cmdp, verbose) + struct tblentry *cmdp; + int verbose; + { + int idx; + const char *path; + char *name; + + printf("%s%s", cmdp->cmdname, (verbose ? " is " : "")); + if (cmdp->cmdtype == CMDNORMAL) { + idx = cmdp->param.index; + path = pathval(); + do { + name = padvance(&path, cmdp->cmdname); + stunalloc(name); + } while (--idx >= 0); + if(verbose) + out1str(name); + } else if (cmdp->cmdtype == CMDBUILTIN) { + if(verbose) + out1str("a shell builtin"); + } else if (cmdp->cmdtype == CMDFUNCTION) { + if (verbose) { + INTOFF; + out1str("a function\n"); + name = commandtext(cmdp->param.func); + printf("%s() {\n %s\n}", cmdp->cmdname, name); + ckfree(name); + INTON; + } +#ifdef DEBUG + } else { + error("internal error: cmdtype %d", cmdp->cmdtype); +#endif + } + printf(snlfmt, cmdp->rehash ? "*" : nullstr); +} + + + +/*** List the available builtins ***/ + + +static int helpcmd(int argc, char** argv) +{ + int col, i; + + printf("\nBuilt-in commands:\n-------------------\n"); + for (col=0, i=0; i < NUMBUILTINS; i++) { + col += printf("%c%s", ((col == 0) ? '\t' : ' '), + builtincmds[i].name+1); + if (col > 60) { + printf("\n"); + col = 0; + } + } +#ifdef BB_FEATURE_SH_STANDALONE_SHELL + { + extern const struct BB_applet applets[]; + extern const size_t NUM_APPLETS; + + for (i=0; i < NUM_APPLETS; i++) { + + col += printf("%c%s", ((col == 0) ? '\t' : ' '), + applets[i].name); + if (col > 60) { + printf("\n"); + col = 0; + } + } + } +#endif + printf("\n\n"); + return EXIT_SUCCESS; +} + +/* + * Resolve a command name. If you change this routine, you may have to + * change the shellexec routine as well. + */ + +static int prefix (const char *, const char *); + +static void +find_command(const char *name, struct cmdentry *entry, int act, const char *path) +{ + struct tblentry *cmdp; + int idx; + int prev; + char *fullname; + struct stat statb; + int e; + int bltin; + int firstchange; + int updatetbl; + int regular; + struct builtincmd *bcmd; + + /* If name contains a slash, don't use the hash table */ + if (strchr(name, '/') != NULL) { + if (act & DO_ABS) { + while (stat(name, &statb) < 0) { + if (errno != ENOENT && errno != ENOTDIR) + e = errno; + entry->cmdtype = CMDUNKNOWN; + entry->u.index = -1; + return; + } + entry->cmdtype = CMDNORMAL; + entry->u.index = -1; + return; + } + entry->cmdtype = CMDNORMAL; + entry->u.index = 0; + return; + } + + updatetbl = 1; + if (act & DO_BRUTE) { + firstchange = path_change(path, &bltin); + } else { + bltin = builtinloc; + firstchange = 9999; + } + + /* If name is in the table, and not invalidated by cd, we're done */ + if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0) { + if (cmdp->cmdtype == CMDFUNCTION) { + if (act & DO_NOFUN) { + updatetbl = 0; + } else { + goto success; + } + } else if (act & DO_BRUTE) { + if ((cmdp->cmdtype == CMDNORMAL && + cmdp->param.index >= firstchange) || + (cmdp->cmdtype == CMDBUILTIN && + ((builtinloc < 0 && bltin >= 0) ? + bltin : builtinloc) >= firstchange)) { + /* need to recompute the entry */ + } else { + goto success; + } + } else { + goto success; + } + } + + bcmd = find_builtin(name); + regular = bcmd && IS_BUILTIN_REGULAR(bcmd); + + if (regular) { + if (cmdp && (cmdp->cmdtype == CMDBUILTIN)) { + goto success; + } + } else if (act & DO_BRUTE) { + if (firstchange == 0) { + updatetbl = 0; + } + } + + /* If %builtin not in path, check for builtin next */ + if (regular || (bltin < 0 && bcmd)) { +builtin: + if (!updatetbl) { + entry->cmdtype = CMDBUILTIN; + entry->u.cmd = bcmd; + return; + } + INTOFF; + cmdp = cmdlookup(name, 1); + cmdp->cmdtype = CMDBUILTIN; + cmdp->param.cmd = bcmd; + INTON; + goto success; + } + + /* We have to search path. */ + prev = -1; /* where to start */ + if (cmdp && cmdp->rehash) { /* doing a rehash */ + if (cmdp->cmdtype == CMDBUILTIN) + prev = builtinloc; + else + prev = cmdp->param.index; + } + + e = ENOENT; + idx = -1; +loop: + while ((fullname = padvance(&path, name)) != NULL) { + stunalloc(fullname); + idx++; + if (idx >= firstchange) { + updatetbl = 0; + } + if (pathopt) { + if (prefix("builtin", pathopt)) { + if ((bcmd = find_builtin(name))) { + goto builtin; + } + continue; + } else if (!(act & DO_NOFUN) && + prefix("func", pathopt)) { + /* handled below */ + } else { + continue; /* ignore unimplemented options */ + } + } + /* if rehash, don't redo absolute path names */ + if (fullname[0] == '/' && idx <= prev && + idx < firstchange) { + if (idx < prev) + continue; + TRACE(("searchexec \"%s\": no change\n", name)); + goto success; + } + while (stat(fullname, &statb) < 0) { + if (errno != ENOENT && errno != ENOTDIR) + e = errno; + goto loop; + } + e = EACCES; /* if we fail, this will be the error */ + if (!S_ISREG(statb.st_mode)) + continue; + if (pathopt) { /* this is a %func directory */ + stalloc(strlen(fullname) + 1); + readcmdfile(fullname); + if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION) + error("%s not defined in %s", name, fullname); + stunalloc(fullname); + goto success; + } + TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname)); + /* If we aren't called with DO_BRUTE and cmdp is set, it must + be a function and we're being called with DO_NOFUN */ + if (!updatetbl) { + entry->cmdtype = CMDNORMAL; + entry->u.index = idx; + return; + } + INTOFF; + cmdp = cmdlookup(name, 1); + cmdp->cmdtype = CMDNORMAL; + cmdp->param.index = idx; + INTON; + goto success; + } + + /* We failed. If there was an entry for this command, delete it */ + if (cmdp && updatetbl) + delete_cmd_entry(); + if (act & DO_ERR) + out2fmt("%s: %s\n", name, errmsg(e, E_EXEC)); + entry->cmdtype = CMDUNKNOWN; + return; + +success: + cmdp->rehash = 0; + entry->cmdtype = cmdp->cmdtype; + entry->u = cmdp->param; +} + + + +/* + * Search the table of builtin commands. + */ + +static int +bstrcmp(const void *name, const void *b) +{ + return strcmp((const char *)name, (*(const char *const *) b)+1); +} + +static struct builtincmd * +find_builtin(const char *name) +{ + struct builtincmd *bp; + + bp = bsearch(name, builtincmds, NUMBUILTINS, sizeof(struct builtincmd), + bstrcmp + ); + return bp; +} + + +/* + * Called when a cd is done. Marks all commands so the next time they + * are executed they will be rehashed. + */ + +static void +hashcd(void) { + struct tblentry **pp; + struct tblentry *cmdp; + + for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) { + for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) { + if (cmdp->cmdtype == CMDNORMAL + || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)) + cmdp->rehash = 1; + } + } +} + + + +/* + * Called before PATH is changed. The argument is the new value of PATH; + * pathval() still returns the old value at this point. Called with + * interrupts off. + */ + +static void +changepath(const char *newval) +{ + int firstchange; + int bltin; + + firstchange = path_change(newval, &bltin); + if (builtinloc < 0 && bltin >= 0) + builtinloc = bltin; /* zap builtins */ + clearcmdentry(firstchange); + builtinloc = bltin; +} + + +/* + * Clear out command entries. The argument specifies the first entry in + * PATH which has changed. + */ + +static void +clearcmdentry(firstchange) + int firstchange; +{ + struct tblentry **tblp; + struct tblentry **pp; + struct tblentry *cmdp; + + INTOFF; + for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) { + pp = tblp; + while ((cmdp = *pp) != NULL) { + if ((cmdp->cmdtype == CMDNORMAL && + cmdp->param.index >= firstchange) + || (cmdp->cmdtype == CMDBUILTIN && + builtinloc >= firstchange)) { + *pp = cmdp->next; + ckfree(cmdp); + } else { + pp = &cmdp->next; + } + } + } + INTON; +} + + +/* + * Delete all functions. + */ + +static void +deletefuncs(void) { + struct tblentry **tblp; + struct tblentry **pp; + struct tblentry *cmdp; + + INTOFF; + for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) { + pp = tblp; + while ((cmdp = *pp) != NULL) { + if (cmdp->cmdtype == CMDFUNCTION) { + *pp = cmdp->next; + freefunc(cmdp->param.func); + ckfree(cmdp); + } else { + pp = &cmdp->next; + } + } + } + INTON; +} + + + +/* + * Locate a command in the command hash table. If "add" is nonzero, + * add the command to the table if it is not already present. The + * variable "lastcmdentry" is set to point to the address of the link + * pointing to the entry, so that delete_cmd_entry can delete the + * entry. + */ + +static struct tblentry **lastcmdentry; + +static struct tblentry * +cmdlookup(const char *name, int add) +{ + int hashval; + const char *p; + struct tblentry *cmdp; + struct tblentry **pp; + + p = name; + hashval = *p << 4; + while (*p) + hashval += *p++; + hashval &= 0x7FFF; + pp = &cmdtable[hashval % CMDTABLESIZE]; + for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) { + if (equal(cmdp->cmdname, name)) + break; + pp = &cmdp->next; + } + if (add && cmdp == NULL) { + INTOFF; + cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB + + strlen(name) + 1); + cmdp->next = NULL; + cmdp->cmdtype = CMDUNKNOWN; + cmdp->rehash = 0; + strcpy(cmdp->cmdname, name); + INTON; + } + lastcmdentry = pp; + return cmdp; +} + +/* + * Delete the command entry returned on the last lookup. + */ + +static void +delete_cmd_entry() { + struct tblentry *cmdp; + + INTOFF; + cmdp = *lastcmdentry; + *lastcmdentry = cmdp->next; + ckfree(cmdp); + INTON; +} + + + + + +static const short nodesize[26] = { + ALIGN(sizeof (struct nbinary)), + ALIGN(sizeof (struct ncmd)), + ALIGN(sizeof (struct npipe)), + ALIGN(sizeof (struct nredir)), + ALIGN(sizeof (struct nredir)), + ALIGN(sizeof (struct nredir)), + ALIGN(sizeof (struct nbinary)), + ALIGN(sizeof (struct nbinary)), + ALIGN(sizeof (struct nif)), + ALIGN(sizeof (struct nbinary)), + ALIGN(sizeof (struct nbinary)), + ALIGN(sizeof (struct nfor)), + ALIGN(sizeof (struct ncase)), + ALIGN(sizeof (struct nclist)), + ALIGN(sizeof (struct narg)), + ALIGN(sizeof (struct narg)), + ALIGN(sizeof (struct nfile)), + ALIGN(sizeof (struct nfile)), + ALIGN(sizeof (struct nfile)), + ALIGN(sizeof (struct nfile)), + ALIGN(sizeof (struct nfile)), + ALIGN(sizeof (struct ndup)), + ALIGN(sizeof (struct ndup)), + ALIGN(sizeof (struct nhere)), + ALIGN(sizeof (struct nhere)), + ALIGN(sizeof (struct nnot)), +}; + + + +/* + * Delete a function if it exists. + */ + +static void +unsetfunc(char *name) +{ + struct tblentry *cmdp; + + if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) { + freefunc(cmdp->param.func); + delete_cmd_entry(); + } +} + + +/* + * Locate and print what a word is... + */ + +static int +typecmd(int argc, char **argv) +{ + int i; + int err = 0; + char *argv_a[2]; + + argv_a[1] = 0; + + for (i = 1; i < argc; i++) { + argv_a[0] = argv[i]; + argptr = argv_a; + optptr = "v"; + err |= hashcmd(argc, argv); + } + return err; +} + +#ifdef ASH_CMDCMD +static int +commandcmd(argc, argv) + int argc; + char **argv; +{ + int c; + int default_path = 0; + int verify_only = 0; + int verbose_verify_only = 0; + + while ((c = nextopt("pvV")) != '\0') + switch (c) { + case 'p': + default_path = 1; + break; + case 'v': + verify_only = 1; + break; + case 'V': + verbose_verify_only = 1; + break; + } + + if (default_path + verify_only + verbose_verify_only > 1 || + !*argptr) { + out2str( + "command [-p] command [arg ...]\n" + "command {-v|-V} command\n"); + return EX_USAGE; + } + + if (verify_only || verbose_verify_only) { + char *argv_a[2]; + + argv_a[1] = 0; + argv_a[0] = *argptr; + argptr = argv_a; + optptr = verbose_verify_only ? "v" : "V"; /* reverse special */ + return hashcmd(argc, argv); + } + + return 0; +} +#endif + +static int +path_change(newval, bltin) + const char *newval; + int *bltin; +{ + const char *old, *new; + int idx; + int firstchange; + + old = pathval(); + new = newval; + firstchange = 9999; /* assume no change */ + idx = 0; + *bltin = -1; + for (;;) { + if (*old != *new) { + firstchange = idx; + if ((*old == '\0' && *new == ':') + || (*old == ':' && *new == '\0')) + firstchange++; + old = new; /* ignore subsequent differences */ + } + if (*new == '\0') + break; + if (*new == '%' && *bltin < 0 && prefix("builtin", new + 1)) + *bltin = idx; + if (*new == ':') { + idx++; + } + new++, old++; + } + if (builtinloc >= 0 && *bltin < 0) + firstchange = 0; + return firstchange; +} +/* + * Routines to expand arguments to commands. We have to deal with + * backquotes, shell variables, and file metacharacters. + */ +/* + * _rmescape() flags + */ +#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */ +#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */ + +/* + * Structure specifying which parts of the string should be searched + * for IFS characters. + */ + +struct ifsregion { + struct ifsregion *next; /* next region in list */ + int begoff; /* offset of start of region */ + int endoff; /* offset of end of region */ + int nulonly; /* search for nul bytes only */ +}; + + +static char *expdest; /* output of current string */ +static struct nodelist *argbackq; /* list of back quote expressions */ +static struct ifsregion ifsfirst; /* first struct in list of ifs regions */ +static struct ifsregion *ifslastp; /* last struct in list */ +static struct arglist exparg; /* holds expanded arg list */ + +static void argstr (char *, int); +static char *exptilde (char *, int); +static void expbackq (union node *, int, int); +static int subevalvar (char *, char *, int, int, int, int, int); +static int varisset (char *, int); +static void strtodest (const char *, const char *, int); +static void varvalue (char *, int, int); +static void recordregion (int, int, int); +static void removerecordregions (int); +static void ifsbreakup (char *, struct arglist *); +static void ifsfree (void); +static void expandmeta (struct strlist *, int); +#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) +#define preglob(p) _rmescapes((p), RMESCAPE_ALLOC | RMESCAPE_GLOB) +#if !defined(GLOB_BROKEN) +static void addglob (const glob_t *); +#endif +#endif +#if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN)) +static void expmeta (char *, char *); +#endif +#if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN)) +static struct strlist *expsort (struct strlist *); +static struct strlist *msort (struct strlist *, int); +#endif +static int patmatch (char *, char *, int); +#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) +static int patmatch2 (char *, char *, int); +#else +static int pmatch (char *, char *, int); +#define patmatch2 patmatch +#endif +static char *cvtnum (int, char *); + +/* + * Expand shell variables and backquotes inside a here document. + */ + +/* arg: the document, fd: where to write the expanded version */ +static inline void +expandhere(union node *arg, int fd) +{ + herefd = fd; + expandarg(arg, (struct arglist *)NULL, 0); + xwrite(fd, stackblock(), expdest - stackblock()); +} + + +/* + * Perform variable substitution and command substitution on an argument, + * placing the resulting list of arguments in arglist. If EXP_FULL is true, + * perform splitting and file name expansion. When arglist is NULL, perform + * here document expansion. + */ + +static void +expandarg(arg, arglist, flag) + union node *arg; + struct arglist *arglist; + int flag; +{ + struct strlist *sp; + char *p; + + argbackq = arg->narg.backquote; + STARTSTACKSTR(expdest); + ifsfirst.next = NULL; + ifslastp = NULL; + argstr(arg->narg.text, flag); + if (arglist == NULL) { + return; /* here document expanded */ + } + STPUTC('\0', expdest); + p = grabstackstr(expdest); + exparg.lastp = &exparg.list; + /* + * TODO - EXP_REDIR + */ + if (flag & EXP_FULL) { + ifsbreakup(p, &exparg); + *exparg.lastp = NULL; + exparg.lastp = &exparg.list; + expandmeta(exparg.list, flag); + } else { + if (flag & EXP_REDIR) + rmescapes(p); + sp = (struct strlist *)stalloc(sizeof (struct strlist)); + sp->text = p; + *exparg.lastp = sp; + exparg.lastp = &sp->next; + } + ifsfree(); + *exparg.lastp = NULL; + if (exparg.list) { + *arglist->lastp = exparg.list; + arglist->lastp = exparg.lastp; + } +} + + +/* + * Expand a variable, and return a pointer to the next character in the + * input string. + */ + +static inline char * +evalvar(p, flag) + char *p; + int flag; +{ + int subtype; + int varflags; + char *var; + const char *val; + int patloc; + int c; + int set; + int special; + int startloc; + int varlen; + int easy; + int quotes = flag & (EXP_FULL | EXP_CASE); + + varflags = *p++; + subtype = varflags & VSTYPE; + var = p; + special = 0; + if (! is_name(*p)) + special = 1; + p = strchr(p, '=') + 1; +again: /* jump here after setting a variable with ${var=text} */ + if (special) { + set = varisset(var, varflags & VSNUL); + val = NULL; + } else { + val = lookupvar(var); + if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { + val = NULL; + set = 0; + } else + set = 1; + } + varlen = 0; + startloc = expdest - stackblock(); + if (set && subtype != VSPLUS) { + /* insert the value of the variable */ + if (special) { + varvalue(var, varflags & VSQUOTE, flag); + if (subtype == VSLENGTH) { + varlen = expdest - stackblock() - startloc; + STADJUST(-varlen, expdest); + } + } else { + if (subtype == VSLENGTH) { + varlen = strlen(val); + } else { + strtodest( + val, + varflags & VSQUOTE ? + DQSYNTAX : BASESYNTAX, + quotes + ); + } + } + } + + if (subtype == VSPLUS) + set = ! set; + + easy = ((varflags & VSQUOTE) == 0 || + (*var == '@' && shellparam.nparam != 1)); + + + switch (subtype) { + case VSLENGTH: + expdest = cvtnum(varlen, expdest); + goto record; + + case VSNORMAL: + if (!easy) + break; +record: + recordregion(startloc, expdest - stackblock(), + varflags & VSQUOTE); + break; + + case VSPLUS: + case VSMINUS: + if (!set) { + argstr(p, flag); + break; + } + if (easy) + goto record; + break; + + case VSTRIMLEFT: + case VSTRIMLEFTMAX: + case VSTRIMRIGHT: + case VSTRIMRIGHTMAX: + if (!set) + break; + /* + * Terminate the string and start recording the pattern + * right after it + */ + STPUTC('\0', expdest); + patloc = expdest - stackblock(); + if (subevalvar(p, NULL, patloc, subtype, + startloc, varflags, quotes) == 0) { + int amount = (expdest - stackblock() - patloc) + 1; + STADJUST(-amount, expdest); + } + /* Remove any recorded regions beyond start of variable */ + removerecordregions(startloc); + goto record; + + case VSASSIGN: + case VSQUESTION: + if (!set) { + if (subevalvar(p, var, 0, subtype, startloc, + varflags, quotes)) { + varflags &= ~VSNUL; + /* + * Remove any recorded regions beyond + * start of variable + */ + removerecordregions(startloc); + goto again; + } + break; + } + if (easy) + goto record; + break; + +#ifdef DEBUG + default: + abort(); +#endif + } + + if (subtype != VSNORMAL) { /* skip to end of alternative */ + int nesting = 1; + for (;;) { + if ((c = *p++) == CTLESC) + p++; + else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { + if (set) + argbackq = argbackq->next; + } else if (c == CTLVAR) { + if ((*p++ & VSTYPE) != VSNORMAL) + nesting++; + } else if (c == CTLENDVAR) { + if (--nesting == 0) + break; + } + } + } + return p; +} + + +/* + * Perform variable and command substitution. If EXP_FULL is set, output CTLESC + * characters to allow for further processing. Otherwise treat + * $@ like $* since no splitting will be performed. + */ + +static void +argstr(p, flag) + char *p; + int flag; +{ + char c; + int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */ + int firsteq = 1; + + if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) + p = exptilde(p, flag); + for (;;) { + switch (c = *p++) { + case '\0': + case CTLENDVAR: /* ??? */ + goto breakloop; + case CTLQUOTEMARK: + /* "$@" syntax adherence hack */ + if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') + break; + if ((flag & EXP_FULL) != 0) + STPUTC(c, expdest); + break; + case CTLESC: + if (quotes) + STPUTC(c, expdest); + c = *p++; + STPUTC(c, expdest); + break; + case CTLVAR: + p = evalvar(p, flag); + break; + case CTLBACKQ: + case CTLBACKQ|CTLQUOTE: + expbackq(argbackq->n, c & CTLQUOTE, flag); + argbackq = argbackq->next; + break; +#ifdef ASH_MATH_SUPPORT + case CTLENDARI: + expari(flag); + break; +#endif + case ':': + case '=': + /* + * sort of a hack - expand tildes in variable + * assignments (after the first '=' and after ':'s). + */ + STPUTC(c, expdest); + if (flag & EXP_VARTILDE && *p == '~') { + if (c == '=') { + if (firsteq) + firsteq = 0; + else + break; + } + p = exptilde(p, flag); + } + break; + default: + STPUTC(c, expdest); + } + } +breakloop:; + return; +} + +static char * +exptilde(p, flag) + char *p; + int flag; +{ + char c, *startp = p; + struct passwd *pw; + const char *home; + int quotes = flag & (EXP_FULL | EXP_CASE); + + while ((c = *p) != '\0') { + switch(c) { + case CTLESC: + return (startp); + case CTLQUOTEMARK: + return (startp); + case ':': + if (flag & EXP_VARTILDE) + goto done; + break; + case '/': + goto done; + } + p++; + } +done: + *p = '\0'; + if (*(startp+1) == '\0') { + if ((home = lookupvar("HOME")) == NULL) + goto lose; + } else { + if ((pw = getpwnam(startp+1)) == NULL) + goto lose; + home = pw->pw_dir; + } + if (*home == '\0') + goto lose; + *p = c; + strtodest(home, SQSYNTAX, quotes); + return (p); +lose: + *p = c; + return (startp); +} + + +static void +removerecordregions(int endoff) +{ + if (ifslastp == NULL) + return; + + if (ifsfirst.endoff > endoff) { + while (ifsfirst.next != NULL) { + struct ifsregion *ifsp; + INTOFF; + ifsp = ifsfirst.next->next; + ckfree(ifsfirst.next); + ifsfirst.next = ifsp; + INTON; + } + if (ifsfirst.begoff > endoff) + ifslastp = NULL; + else { + ifslastp = &ifsfirst; + ifsfirst.endoff = endoff; + } + return; + } + + ifslastp = &ifsfirst; + while (ifslastp->next && ifslastp->next->begoff < endoff) + ifslastp=ifslastp->next; + while (ifslastp->next != NULL) { + struct ifsregion *ifsp; + INTOFF; + ifsp = ifslastp->next->next; + ckfree(ifslastp->next); + ifslastp->next = ifsp; + INTON; + } + if (ifslastp->endoff > endoff) + ifslastp->endoff = endoff; +} + + +#ifdef ASH_MATH_SUPPORT +/* + * Expand arithmetic expression. Backup to start of expression, + * evaluate, place result in (backed up) result, adjust string position. + */ +static void +expari(int flag) +{ + char *p, *start; + int errcode; + int result; + int begoff; + int quotes = flag & (EXP_FULL | EXP_CASE); + int quoted; + + /* ifsfree(); */ + + /* + * This routine is slightly over-complicated for + * efficiency. First we make sure there is + * enough space for the result, which may be bigger + * than the expression if we add exponentation. Next we + * scan backwards looking for the start of arithmetic. If the + * next previous character is a CTLESC character, then we + * have to rescan starting from the beginning since CTLESC + * characters have to be processed left to right. + */ + CHECKSTRSPACE(10, expdest); + USTPUTC('\0', expdest); + start = stackblock(); + p = expdest - 1; + while (*p != CTLARI && p >= start) + --p; + if (*p != CTLARI) + error("missing CTLARI (shouldn't happen)"); + if (p > start && *(p-1) == CTLESC) + for (p = start; *p != CTLARI; p++) + if (*p == CTLESC) + p++; + + if (p[1] == '"') + quoted=1; + else + quoted=0; + begoff = p - start; + removerecordregions(begoff); + if (quotes) + rmescapes(p+2); + result = arith(p+2, &errcode); + if (errcode < 0) { + if(errcode == -2) + error("divide by zero"); + else + error("syntax error: \"%s\"\n", p+2); + } + snprintf(p, 12, "%d", result); + + while (*p++) + ; + + if (quoted == 0) + recordregion(begoff, p - 1 - start, 0); + result = expdest - p + 1; + STADJUST(-result, expdest); +} +#endif + +/* + * Expand stuff in backwards quotes. + */ + +static void +expbackq(cmd, quoted, flag) + union node *cmd; + int quoted; + int flag; +{ + volatile struct backcmd in; + int i; + char buf[128]; + char *p; + char *dest = expdest; + volatile struct ifsregion saveifs; + struct ifsregion *volatile savelastp; + struct nodelist *volatile saveargbackq; + char lastc; + int startloc = dest - stackblock(); + char const *syntax = quoted? DQSYNTAX : BASESYNTAX; + volatile int saveherefd; + int quotes = flag & (EXP_FULL | EXP_CASE); + struct jmploc jmploc; + struct jmploc *volatile savehandler; + int ex; + +#if __GNUC__ + /* Avoid longjmp clobbering */ + (void) &dest; + (void) &syntax; +#endif + + in.fd = -1; + in.buf = 0; + in.jp = 0; + + INTOFF; + saveifs = ifsfirst; + savelastp = ifslastp; + saveargbackq = argbackq; + saveherefd = herefd; + herefd = -1; + if ((ex = setjmp(jmploc.loc))) { + goto err1; + } + savehandler = handler; + handler = &jmploc; + INTON; + p = grabstackstr(dest); + evalbackcmd(cmd, (struct backcmd *) &in); + ungrabstackstr(p, dest); +err1: + INTOFF; + ifsfirst = saveifs; + ifslastp = savelastp; + argbackq = saveargbackq; + herefd = saveherefd; + if (ex) { + goto err2; + } + + p = in.buf; + lastc = '\0'; + for (;;) { + if (--in.nleft < 0) { + if (in.fd < 0) + break; + i = safe_read(in.fd, buf, sizeof buf); + TRACE(("expbackq: read returns %d\n", i)); + if (i <= 0) + break; + p = buf; + in.nleft = i - 1; + } + lastc = *p++; + if (lastc != '\0') { + if (quotes && syntax[(int)lastc] == CCTL) + STPUTC(CTLESC, dest); + STPUTC(lastc, dest); + } + } + + /* Eat all trailing newlines */ + for (; dest > stackblock() && dest[-1] == '\n';) + STUNPUTC(dest); + +err2: + if (in.fd >= 0) + close(in.fd); + if (in.buf) + ckfree(in.buf); + if (in.jp) + exitstatus = waitforjob(in.jp); + handler = savehandler; + if (ex) { + longjmp(handler->loc, 1); + } + if (quoted == 0) + recordregion(startloc, dest - stackblock(), 0); + TRACE(("evalbackq: size=%d: \"%.*s\"\n", + (dest - stackblock()) - startloc, + (dest - stackblock()) - startloc, + stackblock() + startloc)); + expdest = dest; + INTON; +} + +static int +subevalvar(p, str, strloc, subtype, startloc, varflags, quotes) + char *p; + char *str; + int strloc; + int subtype; + int startloc; + int varflags; + int quotes; +{ + char *startp; + char *loc = NULL; + char *q; + int c = 0; + int saveherefd = herefd; + struct nodelist *saveargbackq = argbackq; + int amount; + + herefd = -1; + argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0); + STACKSTRNUL(expdest); + herefd = saveherefd; + argbackq = saveargbackq; + startp = stackblock() + startloc; + if (str == NULL) + str = stackblock() + strloc; + + switch (subtype) { + case VSASSIGN: + setvar(str, startp, 0); + amount = startp - expdest; + STADJUST(amount, expdest); + varflags &= ~VSNUL; + if (c != 0) + *loc = c; + return 1; + + case VSQUESTION: + if (*p != CTLENDVAR) { + out2fmt(snlfmt, startp); + error((char *)NULL); + } + error("%.*s: parameter %snot set", p - str - 1, + str, (varflags & VSNUL) ? "null or " + : nullstr); + /* NOTREACHED */ + + case VSTRIMLEFT: + for (loc = startp; loc < str; loc++) { + c = *loc; + *loc = '\0'; + if (patmatch2(str, startp, quotes)) + goto recordleft; + *loc = c; + if (quotes && *loc == CTLESC) + loc++; + } + return 0; + + case VSTRIMLEFTMAX: + for (loc = str - 1; loc >= startp;) { + c = *loc; + *loc = '\0'; + if (patmatch2(str, startp, quotes)) + goto recordleft; + *loc = c; + loc--; + if (quotes && loc > startp && *(loc - 1) == CTLESC) { + for (q = startp; q < loc; q++) + if (*q == CTLESC) + q++; + if (q > loc) + loc--; + } + } + return 0; + + case VSTRIMRIGHT: + for (loc = str - 1; loc >= startp;) { + if (patmatch2(str, loc, quotes)) + goto recordright; + loc--; + if (quotes && loc > startp && *(loc - 1) == CTLESC) { + for (q = startp; q < loc; q++) + if (*q == CTLESC) + q++; + if (q > loc) + loc--; + } + } + return 0; + + case VSTRIMRIGHTMAX: + for (loc = startp; loc < str - 1; loc++) { + if (patmatch2(str, loc, quotes)) + goto recordright; + if (quotes && *loc == CTLESC) + loc++; + } + return 0; + +#ifdef DEBUG + default: + abort(); +#endif + } + +recordleft: + *loc = c; + amount = ((str - 1) - (loc - startp)) - expdest; + STADJUST(amount, expdest); + while (loc != str - 1) + *startp++ = *loc++; + return 1; + +recordright: + amount = loc - expdest; + STADJUST(amount, expdest); + STPUTC('\0', expdest); + STADJUST(-1, expdest); + return 1; +} + + +/* + * Test whether a specialized variable is set. + */ + +static int +varisset(name, nulok) + char *name; + int nulok; +{ + if (*name == '!') + return backgndpid != -1; + else if (*name == '@' || *name == '*') { + if (*shellparam.p == NULL) + return 0; + + if (nulok) { + char **av; + + for (av = shellparam.p; *av; av++) + if (**av != '\0') + return 1; + return 0; + } + } else if (is_digit(*name)) { + char *ap; + int num = atoi(name); + + if (num > shellparam.nparam) + return 0; + + if (num == 0) + ap = arg0; + else + ap = shellparam.p[num - 1]; + + if (nulok && (ap == NULL || *ap == '\0')) + return 0; + } + return 1; +} + +/* + * Put a string on the stack. + */ + +static void +strtodest(p, syntax, quotes) + const char *p; + const char *syntax; + int quotes; +{ + while (*p) { + if (quotes && syntax[(int) *p] == CCTL) + STPUTC(CTLESC, expdest); + STPUTC(*p++, expdest); + } +} + +/* + * Add the value of a specialized variable to the stack string. + */ + +static void +varvalue(name, quoted, flags) + char *name; + int quoted; + int flags; +{ + int num; + char *p; + int i; + int sep; + int sepq = 0; + char **ap; + char const *syntax; + int allow_split = flags & EXP_FULL; + int quotes = flags & (EXP_FULL | EXP_CASE); + + syntax = quoted ? DQSYNTAX : BASESYNTAX; + switch (*name) { + case '$': + num = rootpid; + goto numvar; + case '?': + num = oexitstatus; + goto numvar; + case '#': + num = shellparam.nparam; + goto numvar; + case '!': + num = backgndpid; +numvar: + expdest = cvtnum(num, expdest); + break; + case '-': + for (i = 0 ; i < NOPTS ; i++) { + if (optent_val(i)) + STPUTC(optent_letter(optlist[i]), expdest); + } + break; + case '@': + if (allow_split && quoted) { + sep = 1 << CHAR_BIT; + goto param; + } + /* fall through */ + case '*': + sep = ifsset() ? ifsval()[0] : ' '; + if (quotes) { + sepq = syntax[(int) sep] == CCTL; + } +param: + for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { + strtodest(p, syntax, quotes); + if (*ap && sep) { + if (sepq) + STPUTC(CTLESC, expdest); + STPUTC(sep, expdest); + } + } + break; + case '0': + strtodest(arg0, syntax, quotes); + break; + default: + num = atoi(name); + if (num > 0 && num <= shellparam.nparam) { + strtodest(shellparam.p[num - 1], syntax, quotes); + } + break; + } +} + + +/* + * Record the fact that we have to scan this region of the + * string for IFS characters. + */ + +static void +recordregion(start, end, nulonly) + int start; + int end; + int nulonly; +{ + struct ifsregion *ifsp; + + if (ifslastp == NULL) { + ifsp = &ifsfirst; + } else { + INTOFF; + ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); + ifsp->next = NULL; + ifslastp->next = ifsp; + INTON; + } + ifslastp = ifsp; + ifslastp->begoff = start; + ifslastp->endoff = end; + ifslastp->nulonly = nulonly; +} + + + +/* + * Break the argument string into pieces based upon IFS and add the + * strings to the argument list. The regions of the string to be + * searched for IFS characters have been stored by recordregion. + */ +static void +ifsbreakup(string, arglist) + char *string; + struct arglist *arglist; + { + struct ifsregion *ifsp; + struct strlist *sp; + char *start; + char *p; + char *q; + const char *ifs, *realifs; + int ifsspc; + int nulonly; + + + start = string; + ifsspc = 0; + nulonly = 0; + realifs = ifsset() ? ifsval() : defifs; + if (ifslastp != NULL) { + ifsp = &ifsfirst; + do { + p = string + ifsp->begoff; + nulonly = ifsp->nulonly; + ifs = nulonly ? nullstr : realifs; + ifsspc = 0; + while (p < string + ifsp->endoff) { + q = p; + if (*p == CTLESC) + p++; + if (strchr(ifs, *p)) { + if (!nulonly) + ifsspc = (strchr(defifs, *p) != NULL); + /* Ignore IFS whitespace at start */ + if (q == start && ifsspc) { + p++; + start = p; + continue; + } + *q = '\0'; + sp = (struct strlist *)stalloc(sizeof *sp); + sp->text = start; + *arglist->lastp = sp; + arglist->lastp = &sp->next; + p++; + if (!nulonly) { + for (;;) { + if (p >= string + ifsp->endoff) { + break; + } + q = p; + if (*p == CTLESC) + p++; + if (strchr(ifs, *p) == NULL ) { + p = q; + break; + } else if (strchr(defifs, *p) == NULL) { + if (ifsspc) { + p++; + ifsspc = 0; + } else { + p = q; + break; + } + } else + p++; + } + } + start = p; + } else + p++; + } + } while ((ifsp = ifsp->next) != NULL); + if (!(*start || (!ifsspc && start > string && nulonly))) { + return; + } + } + + sp = (struct strlist *)stalloc(sizeof *sp); + sp->text = start; + *arglist->lastp = sp; + arglist->lastp = &sp->next; +} + +static void +ifsfree() +{ + while (ifsfirst.next != NULL) { + struct ifsregion *ifsp; + INTOFF; + ifsp = ifsfirst.next->next; + ckfree(ifsfirst.next); + ifsfirst.next = ifsp; + INTON; + } + ifslastp = NULL; + ifsfirst.next = NULL; +} + +/* + * Add a file name to the list. + */ + +static void +addfname(const char *name) +{ + char *p; + struct strlist *sp; + + p = sstrdup(name); + sp = (struct strlist *)stalloc(sizeof *sp); + sp->text = p; + *exparg.lastp = sp; + exparg.lastp = &sp->next; +} + +/* + * Expand shell metacharacters. At this point, the only control characters + * should be escapes. The results are stored in the list exparg. + */ + +#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) +static void +expandmeta(str, flag) + struct strlist *str; + int flag; +{ + const char *p; + glob_t pglob; + /* TODO - EXP_REDIR */ + + while (str) { + if (fflag) + goto nometa; + p = preglob(str->text); + INTOFF; + switch (glob(p, 0, 0, &pglob)) { + case 0: + if(pglob.gl_pathv[1]==0 && !strcmp(p, pglob.gl_pathv[0])) + goto nometa2; + addglob(&pglob); + globfree(&pglob); + INTON; + break; + case GLOB_NOMATCH: +nometa2: + globfree(&pglob); + INTON; +nometa: + *exparg.lastp = str; + rmescapes(str->text); + exparg.lastp = &str->next; + break; + default: /* GLOB_NOSPACE */ + error("Out of space"); + } + str = str->next; + } +} + + +/* + * Add the result of glob(3) to the list. + */ + +static void +addglob(pglob) + const glob_t *pglob; +{ + char **p = pglob->gl_pathv; + + do { + addfname(*p); + } while (*++p); +} + + +#else /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */ +static char *expdir; + + +static void +expandmeta(str, flag) + struct strlist *str; + int flag; +{ + char *p; + struct strlist **savelastp; + struct strlist *sp; + char c; + /* TODO - EXP_REDIR */ + + while (str) { + if (fflag) + goto nometa; + p = str->text; + for (;;) { /* fast check for meta chars */ + if ((c = *p++) == '\0') + goto nometa; + if (c == '*' || c == '?' || c == '[' || c == '!') + break; + } + savelastp = exparg.lastp; + INTOFF; + if (expdir == NULL) { + int i = strlen(str->text); + expdir = ckmalloc(i < 2048 ? 2048 : i); + } + + expmeta(expdir, str->text); + ckfree(expdir); + expdir = NULL; + INTON; + if (exparg.lastp == savelastp) { + /* + * no matches + */ +nometa: + *exparg.lastp = str; + rmescapes(str->text); + exparg.lastp = &str->next; + } else { + *exparg.lastp = NULL; + *savelastp = sp = expsort(*savelastp); + while (sp->next != NULL) + sp = sp->next; + exparg.lastp = &sp->next; + } + str = str->next; + } +} + + +/* + * Do metacharacter (i.e. *, ?, [...]) expansion. + */ + +static void +expmeta(enddir, name) + char *enddir; + char *name; + { + char *p; + const char *cp; + char *q; + char *start; + char *endname; + int metaflag; + struct stat statb; + DIR *dirp; + struct dirent *dp; + int atend; + int matchdot; + + metaflag = 0; + start = name; + for (p = name ; ; p++) { + if (*p == '*' || *p == '?') + metaflag = 1; + else if (*p == '[') { + q = p + 1; + if (*q == '!') + q++; + for (;;) { + while (*q == CTLQUOTEMARK) + q++; + if (*q == CTLESC) + q++; + if (*q == '/' || *q == '\0') + break; + if (*++q == ']') { + metaflag = 1; + break; + } + } + } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) { + metaflag = 1; + } else if (*p == '\0') + break; + else if (*p == CTLQUOTEMARK) + continue; + else if (*p == CTLESC) + p++; + if (*p == '/') { + if (metaflag) + break; + start = p + 1; + } + } + if (metaflag == 0) { /* we've reached the end of the file name */ + if (enddir != expdir) + metaflag++; + for (p = name ; ; p++) { + if (*p == CTLQUOTEMARK) + continue; + if (*p == CTLESC) + p++; + *enddir++ = *p; + if (*p == '\0') + break; + } + if (metaflag == 0 || lstat(expdir, &statb) >= 0) + addfname(expdir); + return; + } + endname = p; + if (start != name) { + p = name; + while (p < start) { + while (*p == CTLQUOTEMARK) + p++; + if (*p == CTLESC) + p++; + *enddir++ = *p++; + } + } + if (enddir == expdir) { + cp = "."; + } else if (enddir == expdir + 1 && *expdir == '/') { + cp = "/"; + } else { + cp = expdir; + enddir[-1] = '\0'; + } + if ((dirp = opendir(cp)) == NULL) + return; + if (enddir != expdir) + enddir[-1] = '/'; + if (*endname == 0) { + atend = 1; + } else { + atend = 0; + *endname++ = '\0'; + } + matchdot = 0; + p = start; + while (*p == CTLQUOTEMARK) + p++; + if (*p == CTLESC) + p++; + if (*p == '.') + matchdot++; + while (! int_pending() && (dp = readdir(dirp)) != NULL) { + if (dp->d_name[0] == '.' && ! matchdot) + continue; + if (patmatch(start, dp->d_name, 0)) { + if (atend) { + strcpy(enddir, dp->d_name); + addfname(expdir); + } else { + for (p = enddir, cp = dp->d_name; + (*p++ = *cp++) != '\0';) + continue; + p[-1] = '/'; + expmeta(p, endname); + } + } + } + closedir(dirp); + if (! atend) + endname[-1] = '/'; +} +#endif /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */ + + + +#if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN)) +/* + * Sort the results of file name expansion. It calculates the number of + * strings to sort and then calls msort (short for merge sort) to do the + * work. + */ + +static struct strlist * +expsort(str) + struct strlist *str; + { + int len; + struct strlist *sp; + + len = 0; + for (sp = str ; sp ; sp = sp->next) + len++; + return msort(str, len); +} + + +static struct strlist * +msort(list, len) + struct strlist *list; + int len; +{ + struct strlist *p, *q = NULL; + struct strlist **lpp; + int half; + int n; + + if (len <= 1) + return list; + half = len >> 1; + p = list; + for (n = half ; --n >= 0 ; ) { + q = p; + p = p->next; + } + q->next = NULL; /* terminate first half of list */ + q = msort(list, half); /* sort first half of list */ + p = msort(p, len - half); /* sort second half */ + lpp = &list; + for (;;) { + if (strcmp(p->text, q->text) < 0) { + *lpp = p; + lpp = &p->next; + if ((p = *lpp) == NULL) { + *lpp = q; + break; + } + } else { + *lpp = q; + lpp = &q->next; + if ((q = *lpp) == NULL) { + *lpp = p; + break; + } + } + } + return list; +} +#endif + + + +/* + * Returns true if the pattern matches the string. + */ + +#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) +/* squoted: string might have quote chars */ +static int +patmatch(char *pattern, char *string, int squoted) +{ + const char *p; + char *q; + + p = preglob(pattern); + q = squoted ? _rmescapes(string, RMESCAPE_ALLOC) : string; + + return !fnmatch(p, q, 0); +} + + +static int +patmatch2(char *pattern, char *string, int squoted) +{ + char *p; + int res; + + sstrnleft--; + p = grabstackstr(expdest); + res = patmatch(pattern, string, squoted); + ungrabstackstr(p, expdest); + return res; +} +#else +static int +patmatch(char *pattern, char *string, int squoted) { + return pmatch(pattern, string, squoted); +} + + +static int +pmatch(char *pattern, char *string, int squoted) +{ + char *p, *q; + char c; + + p = pattern; + q = string; + for (;;) { + switch (c = *p++) { + case '\0': + goto breakloop; + case CTLESC: + if (squoted && *q == CTLESC) + q++; + if (*q++ != *p++) + return 0; + break; + case CTLQUOTEMARK: + continue; + case '?': + if (squoted && *q == CTLESC) + q++; + if (*q++ == '\0') + return 0; + break; + case '*': + c = *p; + while (c == CTLQUOTEMARK || c == '*') + c = *++p; + if (c != CTLESC && c != CTLQUOTEMARK && + c != '?' && c != '*' && c != '[') { + while (*q != c) { + if (squoted && *q == CTLESC && + q[1] == c) + break; + if (*q == '\0') + return 0; + if (squoted && *q == CTLESC) + q++; + q++; + } + } + do { + if (pmatch(p, q, squoted)) + return 1; + if (squoted && *q == CTLESC) + q++; + } while (*q++ != '\0'); + return 0; + case '[': { + char *endp; + int invert, found; + char chr; + + endp = p; + if (*endp == '!') + endp++; + for (;;) { + while (*endp == CTLQUOTEMARK) + endp++; + if (*endp == '\0') + goto dft; /* no matching ] */ + if (*endp == CTLESC) + endp++; + if (*++endp == ']') + break; + } + invert = 0; + if (*p == '!') { + invert++; + p++; + } + found = 0; + chr = *q++; + if (squoted && chr == CTLESC) + chr = *q++; + if (chr == '\0') + return 0; + c = *p++; + do { + if (c == CTLQUOTEMARK) + continue; + if (c == CTLESC) + c = *p++; + if (*p == '-' && p[1] != ']') { + p++; + while (*p == CTLQUOTEMARK) + p++; + if (*p == CTLESC) + p++; + if (chr >= c && chr <= *p) + found = 1; + p++; + } else { + if (chr == c) + found = 1; + } + } while ((c = *p++) != ']'); + if (found == invert) + return 0; + break; + } +dft: default: + if (squoted && *q == CTLESC) + q++; + if (*q++ != c) + return 0; + break; + } + } +breakloop: + if (*q != '\0') + return 0; + return 1; +} +#endif + + + +/* + * Remove any CTLESC characters from a string. + */ + +#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) +static char * +_rmescapes(char *str, int flag) +{ + char *p, *q, *r; + static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 }; + + p = strpbrk(str, qchars); + if (!p) { + return str; + } + q = p; + r = str; + if (flag & RMESCAPE_ALLOC) { + size_t len = p - str; + q = r = stalloc(strlen(p) + len + 1); + if (len > 0) { + memcpy(q, str, len); + q += len; + } + } + while (*p) { + if (*p == CTLQUOTEMARK) { + p++; + continue; + } + if (*p == CTLESC) { + p++; + if (flag & RMESCAPE_GLOB && *p != '/') { + *q++ = '\\'; + } + } + *q++ = *p++; + } + *q = '\0'; + return r; +} +#else +static void +rmescapes(str) + char *str; +{ + char *p, *q; + + p = str; + while (*p != CTLESC && *p != CTLQUOTEMARK) { + if (*p++ == '\0') + return; + } + q = p; + while (*p) { + if (*p == CTLQUOTEMARK) { + p++; + continue; + } + if (*p == CTLESC) + p++; + *q++ = *p++; + } + *q = '\0'; +} +#endif + + + +/* + * See if a pattern matches in a case statement. + */ + +static int +casematch(union node *pattern, const char *val) +{ + struct stackmark smark; + int result; + char *p; + + setstackmark(&smark); + argbackq = pattern->narg.backquote; + STARTSTACKSTR(expdest); + ifslastp = NULL; + argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); + STPUTC('\0', expdest); + p = grabstackstr(expdest); + result = patmatch(p, (char *)val, 0); + popstackmark(&smark); + return result; +} + +/* + * Our own itoa(). + */ + +static char * +cvtnum(num, buf) + int num; + char *buf; + { + int len; + + CHECKSTRSPACE(32, buf); + len = sprintf(buf, "%d", num); + STADJUST(len, buf); + return buf; +} +/* + * Editline and history functions (and glue). + */ +static int histcmd(argc, argv) + int argc; + char **argv; +{ + error("not compiled with history support"); + /* NOTREACHED */ +} + + +struct redirtab { + struct redirtab *next; + short renamed[10]; /* Current ash support only 0-9 descriptors */ + /* char on arm (and others) can't be negative */ +}; + +static struct redirtab *redirlist; + +extern char **environ; + + + +/* + * Initialization code. + */ + +static void +init(void) { + + /* from cd.c: */ + { + setpwd(0, 0); + } + + /* from input.c: */ + { + basepf.nextc = basepf.buf = basebuf; + } + + /* from var.c: */ + { + char **envp; + char ppid[32]; + + initvar(); + for (envp = environ ; *envp ; envp++) { + if (strchr(*envp, '=')) { + setvareq(*envp, VEXPORT|VTEXTFIXED); + } + } + + snprintf(ppid, sizeof(ppid), "%d", (int) getppid()); + setvar("PPID", ppid, 0); + } +} + + + +/* + * This routine is called when an error or an interrupt occurs in an + * interactive shell and control is returned to the main command loop. + */ + +/* 1 == check for aliases, 2 == also check for assignments */ +static int checkalias; /* also used in no alias mode for check assignments */ + +static void +reset(void) { + + /* from eval.c: */ + { + evalskip = 0; + loopnest = 0; + funcnest = 0; + } + + /* from input.c: */ + { + if (exception != EXSHELLPROC) + parselleft = parsenleft = 0; /* clear input buffer */ + popallfiles(); + } + + /* from parser.c: */ + { + tokpushback = 0; + checkkwd = 0; + checkalias = 0; + } + + /* from redir.c: */ + { + while (redirlist) + popredir(); + } + +} + + + +/* + * This file implements the input routines used by the parser. + */ + +#ifdef BB_FEATURE_COMMAND_EDITING +static const char * cmdedit_prompt; +static inline void putprompt(const char *s) { + cmdedit_prompt = s; +} +#else +static inline void putprompt(const char *s) { + out2str(s); +} +#endif + +#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */ + + + +/* + * Same as pgetc(), but ignores PEOA. + */ + +#ifdef ASH_ALIAS +static int +pgetc2() +{ + int c; + do { + c = pgetc_macro(); + } while (c == PEOA); + return c; +} +#else +static inline int pgetc2() { return pgetc_macro(); } +#endif + +/* + * Read a line from the script. + */ + +static inline char * +pfgets(char *line, int len) +{ + char *p = line; + int nleft = len; + int c; + + while (--nleft > 0) { + c = pgetc2(); + if (c == PEOF) { + if (p == line) + return NULL; + break; + } + *p++ = c; + if (c == '\n') + break; + } + *p = '\0'; + return line; +} + +static inline int +preadfd(void) +{ + int nr; + char *buf = parsefile->buf; + parsenextc = buf; + +retry: +#ifdef BB_FEATURE_COMMAND_EDITING + { + if (!iflag || parsefile->fd) + nr = safe_read(parsefile->fd, buf, BUFSIZ - 1); + else { + nr = cmdedit_read_input((char*)cmdedit_prompt, buf); + } + } +#else + nr = safe_read(parsefile->fd, buf, BUFSIZ - 1); +#endif + + if (nr < 0) { + if (parsefile->fd == 0 && errno == EWOULDBLOCK) { + int flags = fcntl(0, F_GETFL, 0); + if (flags >= 0 && flags & O_NONBLOCK) { + flags &=~ O_NONBLOCK; + if (fcntl(0, F_SETFL, flags) >= 0) { + out2str("sh: turning off NDELAY mode\n"); + goto retry; + } + } + } + } + return nr; +} + +static void +popstring(void) +{ + struct strpush *sp = parsefile->strpush; + + INTOFF; +#ifdef ASH_ALIAS + if (sp->ap) { + if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') { + if (!checkalias) { + checkalias = 1; + } + } + if (sp->string != sp->ap->val) { + ckfree(sp->string); + } + + sp->ap->flag &= ~ALIASINUSE; + if (sp->ap->flag & ALIASDEAD) { + unalias(sp->ap->name); + } + } +#endif + parsenextc = sp->prevstring; + parsenleft = sp->prevnleft; +/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/ + parsefile->strpush = sp->prev; + if (sp != &(parsefile->basestrpush)) + ckfree(sp); + INTON; +} + + +/* + * Refill the input buffer and return the next input character: + * + * 1) If a string was pushed back on the input, pop it; + * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading + * from a string so we can't refill the buffer, return EOF. + * 3) If the is more stuff in this buffer, use it else call read to fill it. + * 4) Process input up to the next newline, deleting nul characters. + */ + +static int +preadbuffer(void) +{ + char *p, *q; + int more; + char savec; + + while (parsefile->strpush) { +#ifdef ASH_ALIAS + if (parsenleft == -1 && parsefile->strpush->ap && + parsenextc[-1] != ' ' && parsenextc[-1] != '\t') { + return PEOA; + } +#endif + popstring(); + if (--parsenleft >= 0) + return (*parsenextc++); + } + if (parsenleft == EOF_NLEFT || parsefile->buf == NULL) + return PEOF; + flushall(); + +again: + if (parselleft <= 0) { + if ((parselleft = preadfd()) <= 0) { + parselleft = parsenleft = EOF_NLEFT; + return PEOF; + } + } + + q = p = parsenextc; + + /* delete nul characters */ + for (more = 1; more;) { + switch (*p) { + case '\0': + p++; /* Skip nul */ + goto check; + + + case '\n': + parsenleft = q - parsenextc; + more = 0; /* Stop processing here */ + break; + } + + *q++ = *p++; +check: + if (--parselleft <= 0 && more) { + parsenleft = q - parsenextc - 1; + if (parsenleft < 0) + goto again; + more = 0; + } + } + + savec = *q; + *q = '\0'; + + if (vflag) { + out2str(parsenextc); + } + + *q = savec; + + return *parsenextc++; +} + + +/* + * Push a string back onto the input at this current parsefile level. + * We handle aliases this way. + */ +static void +pushstring(char *s, int len, void *ap) +{ + struct strpush *sp; + + INTOFF; +/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/ + if (parsefile->strpush) { + sp = ckmalloc(sizeof (struct strpush)); + sp->prev = parsefile->strpush; + parsefile->strpush = sp; + } else + sp = parsefile->strpush = &(parsefile->basestrpush); + sp->prevstring = parsenextc; + sp->prevnleft = parsenleft; +#ifdef ASH_ALIAS + sp->ap = (struct alias *)ap; + if (ap) { + ((struct alias *)ap)->flag |= ALIASINUSE; + sp->string = s; + } +#endif + parsenextc = s; + parsenleft = len; + INTON; +} + + +/* + * Like setinputfile, but takes input from a string. + */ + +static void +setinputstring(char *string) +{ + INTOFF; + pushfile(); + parsenextc = string; + parsenleft = strlen(string); + parsefile->buf = NULL; + plinno = 1; + INTON; +} + + + +/* + * To handle the "." command, a stack of input files is used. Pushfile + * adds a new entry to the stack and popfile restores the previous level. + */ + +static void +pushfile(void) { + struct parsefile *pf; + + parsefile->nleft = parsenleft; + parsefile->lleft = parselleft; + parsefile->nextc = parsenextc; + parsefile->linno = plinno; + pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile)); + pf->prev = parsefile; + pf->fd = -1; + pf->strpush = NULL; + pf->basestrpush.prev = NULL; + parsefile = pf; +} + +#ifdef JOBS +static void restartjob (struct job *); +#endif +static void freejob (struct job *); +static struct job *getjob (const char *); +static int dowait (int, struct job *); +static void waitonint(int); + + +/* + * We keep track of whether or not fd0 has been redirected. This is for + * background commands, where we want to redirect fd0 to /dev/null only + * if it hasn't already been redirected. +*/ +static int fd0_redirected = 0; + +/* Return true if fd 0 has already been redirected at least once. */ +static inline int +fd0_redirected_p () { + return fd0_redirected != 0; +} + +static void dupredirect (const union node *, int, int fd1dup); + +#ifdef JOBS +/* + * Turn job control on and off. + * + * Note: This code assumes that the third arg to ioctl is a character + * pointer, which is true on Berkeley systems but not System V. Since + * System V doesn't have job control yet, this isn't a problem now. + */ + + + +static void setjobctl(int enable) +{ +#ifdef OLD_TTY_DRIVER + int ldisc; +#endif + + if (enable == jobctl || rootshell == 0) + return; + if (enable) { + do { /* while we are in the background */ +#ifdef OLD_TTY_DRIVER + if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) { +#else + initialpgrp = tcgetpgrp(2); + if (initialpgrp < 0) { +#endif + out2str("sh: can't access tty; job control turned off\n"); + mflag = 0; + return; + } + if (initialpgrp == -1) + initialpgrp = getpgrp(); + else if (initialpgrp != getpgrp()) { + killpg(initialpgrp, SIGTTIN); + continue; + } + } while (0); +#ifdef OLD_TTY_DRIVER + if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) { + out2str("sh: need new tty driver to run job control; job control turned off\n"); + mflag = 0; + return; + } +#endif + setsignal(SIGTSTP); + setsignal(SIGTTOU); + setsignal(SIGTTIN); + setpgid(0, rootpid); +#ifdef OLD_TTY_DRIVER + ioctl(2, TIOCSPGRP, (char *)&rootpid); +#else + tcsetpgrp(2, rootpid); +#endif + } else { /* turning job control off */ + setpgid(0, initialpgrp); +#ifdef OLD_TTY_DRIVER + ioctl(2, TIOCSPGRP, (char *)&initialpgrp); +#else + tcsetpgrp(2, initialpgrp); +#endif + setsignal(SIGTSTP); + setsignal(SIGTTOU); + setsignal(SIGTTIN); + } + jobctl = enable; +} +#endif + + +#ifdef JOBS +static int +killcmd(argc, argv) + int argc; + char **argv; +{ + int signo = -1; + int list = 0; + int i; + pid_t pid; + struct job *jp; + + if (argc <= 1) { +usage: + error( +"Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n" +"kill -l [exitstatus]" + ); + } + + if (*argv[1] == '-') { + signo = decode_signal(argv[1] + 1, 1); + if (signo < 0) { + int c; + + while ((c = nextopt("ls:")) != '\0') + switch (c) { + case 'l': + list = 1; + break; + case 's': + signo = decode_signal(optionarg, 1); + if (signo < 0) { + error( + "invalid signal number or name: %s", + optionarg + ); + } + break; +#ifdef DEBUG + default: + error( + "nextopt returned character code 0%o", c); +#endif + } + } else + argptr++; + } + + if (!list && signo < 0) + signo = SIGTERM; + + if ((signo < 0 || !*argptr) ^ list) { + goto usage; + } + + if (list) { + const char *name; + + if (!*argptr) { + out1str("0\n"); + for (i = 1; i < NSIG; i++) { + name = u_signal_names(0, &i, 1); + if(name) + printf(snlfmt, name); + } + return 0; + } + name = u_signal_names(*argptr, &signo, -1); + if (name) + printf(snlfmt, name); + else + error("invalid signal number or exit status: %s", + *argptr); + return 0; + } + + do { + if (**argptr == '%') { + jp = getjob(*argptr); + if (jp->jobctl == 0) + error("job %s not created under job control", + *argptr); + pid = -jp->ps[0].pid; + } else + pid = atoi(*argptr); + if (kill(pid, signo) != 0) + error("%s: %m", *argptr); + } while (*++argptr); + + return 0; +} + +static int +fgcmd(argc, argv) + int argc; + char **argv; +{ + struct job *jp; + int pgrp; + int status; + + jp = getjob(argv[1]); + if (jp->jobctl == 0) + error("job not created under job control"); + pgrp = jp->ps[0].pid; +#ifdef OLD_TTY_DRIVER + ioctl(2, TIOCSPGRP, (char *)&pgrp); +#else + tcsetpgrp(2, pgrp); +#endif + restartjob(jp); + INTOFF; + status = waitforjob(jp); + INTON; + return status; +} + + +static int +bgcmd(argc, argv) + int argc; + char **argv; +{ + struct job *jp; + + do { + jp = getjob(*++argv); + if (jp->jobctl == 0) + error("job not created under job control"); + restartjob(jp); + } while (--argc > 1); + return 0; +} + + +static void +restartjob(jp) + struct job *jp; +{ + struct procstat *ps; + int i; + + if (jp->state == JOBDONE) + return; + INTOFF; + killpg(jp->ps[0].pid, SIGCONT); + for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { + if (WIFSTOPPED(ps->status)) { + ps->status = -1; + jp->state = 0; + } + } + INTON; +} +#endif + +static void showjobs(int change); + + +static int +jobscmd(argc, argv) + int argc; + char **argv; +{ + showjobs(0); + return 0; +} + + +/* + * Print a list of jobs. If "change" is nonzero, only print jobs whose + * statuses have changed since the last call to showjobs. + * + * If the shell is interrupted in the process of creating a job, the + * result may be a job structure containing zero processes. Such structures + * will be freed here. + */ + +static void +showjobs(change) + int change; +{ + int jobno; + int procno; + int i; + struct job *jp; + struct procstat *ps; + int col; + char s[64]; + + TRACE(("showjobs(%d) called\n", change)); + while (dowait(0, (struct job *)NULL) > 0); + for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { + if (! jp->used) + continue; + if (jp->nprocs == 0) { + freejob(jp); + continue; + } + if (change && ! jp->changed) + continue; + procno = jp->nprocs; + for (ps = jp->ps ; ; ps++) { /* for each process */ + if (ps == jp->ps) + snprintf(s, 64, "[%d] %ld ", jobno, + (long)ps->pid); + else + snprintf(s, 64, " %ld ", + (long)ps->pid); + out1str(s); + col = strlen(s); + s[0] = '\0'; + if (ps->status == -1) { + /* don't print anything */ + } else if (WIFEXITED(ps->status)) { + snprintf(s, 64, "Exit %d", + WEXITSTATUS(ps->status)); + } else { +#ifdef JOBS + if (WIFSTOPPED(ps->status)) + i = WSTOPSIG(ps->status); + else /* WIFSIGNALED(ps->status) */ +#endif + i = WTERMSIG(ps->status); + if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F]) + strcpy(s, sys_siglist[i & 0x7F]); + else + snprintf(s, 64, "Signal %d", i & 0x7F); + if (WCOREDUMP(ps->status)) + strcat(s, " (core dumped)"); + } + out1str(s); + col += strlen(s); + printf( + "%*c%s\n", 30 - col >= 0 ? 30 - col : 0, ' ', + ps->cmd + ); + if (--procno <= 0) + break; + } + jp->changed = 0; + if (jp->state == JOBDONE) { + freejob(jp); + } + } +} + + +/* + * Mark a job structure as unused. + */ + +static void +freejob(struct job *jp) +{ + const struct procstat *ps; + int i; + + INTOFF; + for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { + if (ps->cmd != nullstr) + ckfree(ps->cmd); + } + if (jp->ps != &jp->ps0) + ckfree(jp->ps); + jp->used = 0; +#ifdef JOBS + if (curjob == jp - jobtab + 1) + curjob = 0; +#endif + INTON; +} + + + +static int +waitcmd(argc, argv) + int argc; + char **argv; +{ + struct job *job; + int status, retval; + struct job *jp; + + if (--argc > 0) { +start: + job = getjob(*++argv); + } else { + job = NULL; + } + for (;;) { /* loop until process terminated or stopped */ + if (job != NULL) { + if (job->state) { + status = job->ps[job->nprocs - 1].status; + if (! iflag) + freejob(job); + if (--argc) { + goto start; + } + if (WIFEXITED(status)) + retval = WEXITSTATUS(status); +#ifdef JOBS + else if (WIFSTOPPED(status)) + retval = WSTOPSIG(status) + 128; +#endif + else { + retval = WTERMSIG(status) + 128; + } + return retval; + } + } else { + for (jp = jobtab ; ; jp++) { + if (jp >= jobtab + njobs) { /* no running procs */ + return 0; + } + if (jp->used && jp->state == 0) + break; + } + } + if (dowait(2, 0) < 0 && errno == EINTR) { + return 129; + } + } +} + + + +/* + * Convert a job name to a job structure. + */ + +static struct job * +getjob(const char *name) +{ + int jobno; + struct job *jp; + int pid; + int i; + + if (name == NULL) { +#ifdef JOBS +currentjob: + if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0) + error("No current job"); + return &jobtab[jobno - 1]; +#else + error("No current job"); +#endif + } else if (name[0] == '%') { + if (is_digit(name[1])) { + jobno = number(name + 1); + if (jobno > 0 && jobno <= njobs + && jobtab[jobno - 1].used != 0) + return &jobtab[jobno - 1]; +#ifdef JOBS + } else if (name[1] == '%' && name[2] == '\0') { + goto currentjob; +#endif + } else { + struct job *found = NULL; + for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { + if (jp->used && jp->nprocs > 0 + && prefix(name + 1, jp->ps[0].cmd)) { + if (found) + error("%s: ambiguous", name); + found = jp; + } + } + if (found) + return found; + } + } else if (is_number(name, &pid)) { + for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { + if (jp->used && jp->nprocs > 0 + && jp->ps[jp->nprocs - 1].pid == pid) + return jp; + } + } + error("No such job: %s", name); + /* NOTREACHED */ +} + + + +/* + * Return a new job structure, + */ + +static struct job * +makejob(const union node *node, int nprocs) +{ + int i; + struct job *jp; + + for (i = njobs, jp = jobtab ; ; jp++) { + if (--i < 0) { + INTOFF; + if (njobs == 0) { + jobtab = ckmalloc(4 * sizeof jobtab[0]); + } else { + jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); + memcpy(jp, jobtab, njobs * sizeof jp[0]); + /* Relocate `ps' pointers */ + for (i = 0; i < njobs; i++) + if (jp[i].ps == &jobtab[i].ps0) + jp[i].ps = &jp[i].ps0; + ckfree(jobtab); + jobtab = jp; + } + jp = jobtab + njobs; + for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); + INTON; + break; + } + if (jp->used == 0) + break; + } + INTOFF; + jp->state = 0; + jp->used = 1; + jp->changed = 0; + jp->nprocs = 0; +#ifdef JOBS + jp->jobctl = jobctl; +#endif + if (nprocs > 1) { + jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); + } else { + jp->ps = &jp->ps0; + } + INTON; + TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs, + jp - jobtab + 1)); + return jp; +} + + +/* + * Fork of a subshell. If we are doing job control, give the subshell its + * own process group. Jp is a job structure that the job is to be added to. + * N is the command that will be evaluated by the child. Both jp and n may + * be NULL. The mode parameter can be one of the following: + * FORK_FG - Fork off a foreground process. + * FORK_BG - Fork off a background process. + * FORK_NOJOB - Like FORK_FG, but don't give the process its own + * process group even if job control is on. + * + * When job control is turned off, background processes have their standard + * input redirected to /dev/null (except for the second and later processes + * in a pipeline). + */ + + + +static int +forkshell(struct job *jp, const union node *n, int mode) +{ + int pid; +#ifdef JOBS + int pgrp; +#endif + const char *devnull = _PATH_DEVNULL; + const char *nullerr = "Can't open %s"; + + TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n, + mode)); + INTOFF; + pid = fork(); + if (pid == -1) { + TRACE(("Fork failed, errno=%d\n", errno)); + INTON; + error("Cannot fork"); + } + if (pid == 0) { + struct job *p; + int wasroot; + int i; + + TRACE(("Child shell %d\n", getpid())); + wasroot = rootshell; + rootshell = 0; + closescript(); + INTON; + clear_traps(); +#ifdef JOBS + jobctl = 0; /* do job control only in root shell */ + if (wasroot && mode != FORK_NOJOB && mflag) { + if (jp == NULL || jp->nprocs == 0) + pgrp = getpid(); + else + pgrp = jp->ps[0].pid; + setpgid(0, pgrp); + if (mode == FORK_FG) { + /*** this causes superfluous TIOCSPGRPS ***/ +#ifdef OLD_TTY_DRIVER + if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0) + error("TIOCSPGRP failed, errno=%d", errno); +#else + if (tcsetpgrp(2, pgrp) < 0) + error("tcsetpgrp failed, errno=%d", errno); +#endif + } + setsignal(SIGTSTP); + setsignal(SIGTTOU); + } else if (mode == FORK_BG) { + ignoresig(SIGINT); + ignoresig(SIGQUIT); + if ((jp == NULL || jp->nprocs == 0) && + ! fd0_redirected_p ()) { + close(0); + if (open(devnull, O_RDONLY) != 0) + error(nullerr, devnull); + } + } +#else + if (mode == FORK_BG) { + ignoresig(SIGINT); + ignoresig(SIGQUIT); + if ((jp == NULL || jp->nprocs == 0) && + ! fd0_redirected_p ()) { + close(0); + if (open(devnull, O_RDONLY) != 0) + error(nullerr, devnull); + } + } +#endif + for (i = njobs, p = jobtab ; --i >= 0 ; p++) + if (p->used) + freejob(p); + if (wasroot && iflag) { + setsignal(SIGINT); + setsignal(SIGQUIT); + setsignal(SIGTERM); + } + return pid; + } +#ifdef JOBS + if (rootshell && mode != FORK_NOJOB && mflag) { + if (jp == NULL || jp->nprocs == 0) + pgrp = pid; + else + pgrp = jp->ps[0].pid; + setpgid(pid, pgrp); + } +#endif + if (mode == FORK_BG) + backgndpid = pid; /* set $! */ + if (jp) { + struct procstat *ps = &jp->ps[jp->nprocs++]; + ps->pid = pid; + ps->status = -1; + ps->cmd = nullstr; + if (iflag && rootshell && n) + ps->cmd = commandtext(n); + } + INTON; + TRACE(("In parent shell: child = %d\n", pid)); + return pid; +} + + + +/* + * Wait for job to finish. + * + * Under job control we have the problem that while a child process is + * running interrupts generated by the user are sent to the child but not + * to the shell. This means that an infinite loop started by an inter- + * active user may be hard to kill. With job control turned off, an + * interactive user may place an interactive program inside a loop. If + * the interactive program catches interrupts, the user doesn't want + * these interrupts to also abort the loop. The approach we take here + * is to have the shell ignore interrupt signals while waiting for a + * forground process to terminate, and then send itself an interrupt + * signal if the child process was terminated by an interrupt signal. + * Unfortunately, some programs want to do a bit of cleanup and then + * exit on interrupt; unless these processes terminate themselves by + * sending a signal to themselves (instead of calling exit) they will + * confuse this approach. + */ + +static int +waitforjob(struct job *jp) +{ +#ifdef JOBS + int mypgrp = getpgrp(); +#endif + int status; + int st; + struct sigaction act, oact; + + INTOFF; + intreceived = 0; +#ifdef JOBS + if (!jobctl) { +#else + if (!iflag) { +#endif + sigaction(SIGINT, 0, &act); + act.sa_handler = waitonint; + sigaction(SIGINT, &act, &oact); + } + TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1)); + while (jp->state == 0) { + dowait(1, jp); + } +#ifdef JOBS + if (!jobctl) { +#else + if (!iflag) { +#endif + sigaction(SIGINT, &oact, 0); + if (intreceived && trap[SIGINT]) kill(getpid(), SIGINT); + } +#ifdef JOBS + if (jp->jobctl) { +#ifdef OLD_TTY_DRIVER + if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0) + error("TIOCSPGRP failed, errno=%d\n", errno); +#else + if (tcsetpgrp(2, mypgrp) < 0) + error("tcsetpgrp failed, errno=%d\n", errno); +#endif + } + if (jp->state == JOBSTOPPED) + curjob = jp - jobtab + 1; +#endif + status = jp->ps[jp->nprocs - 1].status; + /* convert to 8 bits */ + if (WIFEXITED(status)) + st = WEXITSTATUS(status); +#ifdef JOBS + else if (WIFSTOPPED(status)) + st = WSTOPSIG(status) + 128; +#endif + else + st = WTERMSIG(status) + 128; +#ifdef JOBS + if (jp->jobctl) { + /* + * This is truly gross. + * If we're doing job control, then we did a TIOCSPGRP which + * caused us (the shell) to no longer be in the controlling + * session -- so we wouldn't have seen any ^C/SIGINT. So, we + * intuit from the subprocess exit status whether a SIGINT + * occured, and if so interrupt ourselves. Yuck. - mycroft + */ + if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) + raise(SIGINT); + } + if (jp->state == JOBDONE) + +#endif + freejob(jp); + INTON; + return st; +} + + + +/* + * Wait for a process to terminate. + */ + +/* + * Do a wait system call. If job control is compiled in, we accept + * stopped processes. If block is zero, we return a value of zero + * rather than blocking. + * + * System V doesn't have a non-blocking wait system call. It does + * have a SIGCLD signal that is sent to a process when one of it's + * children dies. The obvious way to use SIGCLD would be to install + * a handler for SIGCLD which simply bumped a counter when a SIGCLD + * was received, and have waitproc bump another counter when it got + * the status of a process. Waitproc would then know that a wait + * system call would not block if the two counters were different. + * This approach doesn't work because if a process has children that + * have not been waited for, System V will send it a SIGCLD when it + * installs a signal handler for SIGCLD. What this means is that when + * a child exits, the shell will be sent SIGCLD signals continuously + * until is runs out of stack space, unless it does a wait call before + * restoring the signal handler. The code below takes advantage of + * this (mis)feature by installing a signal handler for SIGCLD and + * then checking to see whether it was called. If there are any + * children to be waited for, it will be. + * + */ + +static inline int +waitproc(int block, int *status) +{ + int flags; + + flags = 0; +#ifdef JOBS + if (jobctl) + flags |= WUNTRACED; +#endif + if (block == 0) + flags |= WNOHANG; + return wait3(status, flags, (struct rusage *)NULL); +} + +static int +dowait(int block, struct job *job) +{ + int pid; + int status; + struct procstat *sp; + struct job *jp; + struct job *thisjob; + int done; + int stopped; + int core; + int sig; + + TRACE(("dowait(%d) called\n", block)); + do { + pid = waitproc(block, &status); + TRACE(("wait returns %d, status=%d\n", pid, status)); + } while (!(block & 2) && pid == -1 && errno == EINTR); + if (pid <= 0) + return pid; + INTOFF; + thisjob = NULL; + for (jp = jobtab ; jp < jobtab + njobs ; jp++) { + if (jp->used) { + done = 1; + stopped = 1; + for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { + if (sp->pid == -1) + continue; + if (sp->pid == pid) { + TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status)); + sp->status = status; + thisjob = jp; + } + if (sp->status == -1) + stopped = 0; + else if (WIFSTOPPED(sp->status)) + done = 0; + } + if (stopped) { /* stopped or done */ + int state = done? JOBDONE : JOBSTOPPED; + if (jp->state != state) { + TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); + jp->state = state; +#ifdef JOBS + if (done && curjob == jp - jobtab + 1) + curjob = 0; /* no current job */ +#endif + } + } + } + } + INTON; + if (! rootshell || ! iflag || (job && thisjob == job)) { + core = WCOREDUMP(status); +#ifdef JOBS + if (WIFSTOPPED(status)) sig = WSTOPSIG(status); + else +#endif + if (WIFEXITED(status)) sig = 0; + else sig = WTERMSIG(status); + + if (sig != 0 && sig != SIGINT && sig != SIGPIPE) { + if (thisjob != job) + out2fmt("%d: ", pid); +#ifdef JOBS + if (sig == SIGTSTP && rootshell && iflag) + out2fmt("%%%ld ", + (long)(job - jobtab + 1)); +#endif + if (sig < NSIG && sys_siglist[sig]) + out2str(sys_siglist[sig]); + else + out2fmt("Signal %d", sig); + if (core) + out2str(" - core dumped"); + out2c('\n'); + } else { + TRACE(("Not printing status: status=%d, sig=%d\n", + status, sig)); + } + } else { + TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job)); + if (thisjob) + thisjob->changed = 1; + } + return pid; +} + + + + +/* + * return 1 if there are stopped jobs, otherwise 0 + */ +static int +stoppedjobs(void) +{ + int jobno; + struct job *jp; + + if (job_warning) + return (0); + for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { + if (jp->used == 0) + continue; + if (jp->state == JOBSTOPPED) { + out2str("You have stopped jobs.\n"); + job_warning = 2; + return (1); + } + } + + return (0); +} + +/* + * Return a string identifying a command (to be printed by the + * jobs command. + */ + +static char *cmdnextc; +static int cmdnleft; +#define MAXCMDTEXT 200 + +static void +cmdputs(const char *s) +{ + const char *p; + char *q; + char c; + int subtype = 0; + + if (cmdnleft <= 0) + return; + p = s; + q = cmdnextc; + while ((c = *p++) != '\0') { + if (c == CTLESC) + *q++ = *p++; + else if (c == CTLVAR) { + *q++ = '$'; + if (--cmdnleft > 0) + *q++ = '{'; + subtype = *p++; + } else if (c == '=' && subtype != 0) { + *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL]; + subtype = 0; + } else if (c == CTLENDVAR) { + *q++ = '}'; + } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) + cmdnleft++; /* ignore it */ + else + *q++ = c; + if (--cmdnleft <= 0) { + *q++ = '.'; + *q++ = '.'; + *q++ = '.'; + break; + } + } + cmdnextc = q; +} + + +static void +cmdtxt(const union node *n) +{ + union node *np; + struct nodelist *lp; + const char *p; + int i; + char s[2]; + + if (n == NULL) + return; + switch (n->type) { + case NSEMI: + cmdtxt(n->nbinary.ch1); + cmdputs("; "); + cmdtxt(n->nbinary.ch2); + break; + case NAND: + cmdtxt(n->nbinary.ch1); + cmdputs(" && "); + cmdtxt(n->nbinary.ch2); + break; + case NOR: + cmdtxt(n->nbinary.ch1); + cmdputs(" || "); + cmdtxt(n->nbinary.ch2); + break; + case NPIPE: + for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { + cmdtxt(lp->n); + if (lp->next) + cmdputs(" | "); + } + break; + case NSUBSHELL: + cmdputs("("); + cmdtxt(n->nredir.n); + cmdputs(")"); + break; + case NREDIR: + case NBACKGND: + cmdtxt(n->nredir.n); + break; + case NIF: + cmdputs("if "); + cmdtxt(n->nif.test); + cmdputs("; then "); + cmdtxt(n->nif.ifpart); + cmdputs("..."); + break; + case NWHILE: + cmdputs("while "); + goto until; + case NUNTIL: + cmdputs("until "); +until: + cmdtxt(n->nbinary.ch1); + cmdputs("; do "); + cmdtxt(n->nbinary.ch2); + cmdputs("; done"); + break; + case NFOR: + cmdputs("for "); + cmdputs(n->nfor.var); + cmdputs(" in ..."); + break; + case NCASE: + cmdputs("case "); + cmdputs(n->ncase.expr->narg.text); + cmdputs(" in ..."); + break; + case NDEFUN: + cmdputs(n->narg.text); + cmdputs("() ..."); + break; + case NCMD: + for (np = n->ncmd.args ; np ; np = np->narg.next) { + cmdtxt(np); + if (np->narg.next) + cmdputs(spcstr); + } + for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { + cmdputs(spcstr); + cmdtxt(np); + } + break; + case NARG: + cmdputs(n->narg.text); + break; + case NTO: + p = ">"; i = 1; goto redir; + case NAPPEND: + p = ">>"; i = 1; goto redir; + case NTOFD: + p = ">&"; i = 1; goto redir; + case NTOOV: + p = ">|"; i = 1; goto redir; + case NFROM: + p = "<"; i = 0; goto redir; + case NFROMFD: + p = "<&"; i = 0; goto redir; + case NFROMTO: + p = "<>"; i = 0; goto redir; +redir: + if (n->nfile.fd != i) { + s[0] = n->nfile.fd + '0'; + s[1] = '\0'; + cmdputs(s); + } + cmdputs(p); + if (n->type == NTOFD || n->type == NFROMFD) { + s[0] = n->ndup.dupfd + '0'; + s[1] = '\0'; + cmdputs(s); + } else { + cmdtxt(n->nfile.fname); + } + break; + case NHERE: + case NXHERE: + cmdputs("<<..."); + break; + default: + cmdputs("???"); + break; + } +} + + +static char * +commandtext(const union node *n) +{ + char *name; + + cmdnextc = name = ckmalloc(MAXCMDTEXT); + cmdnleft = MAXCMDTEXT - 4; + cmdtxt(n); + *cmdnextc = '\0'; + return name; +} + + +static void waitonint(int sig) { + intreceived = 1; + return; +} +/* + * Routines to check for mail. (Perhaps make part of main.c?) + */ + + +#define MAXMBOXES 10 + + +static int nmboxes; /* number of mailboxes */ +static time_t mailtime[MAXMBOXES]; /* times of mailboxes */ + + + +/* + * Print appropriate message(s) if mail has arrived. If the argument is + * nozero, then the value of MAIL has changed, so we just update the + * values. + */ + +static void +chkmail(int silent) +{ + int i; + const char *mpath; + char *p; + char *q; + struct stackmark smark; + struct stat statb; + + if (silent) + nmboxes = 10; + if (nmboxes == 0) + return; + setstackmark(&smark); + mpath = mpathset()? mpathval() : mailval(); + for (i = 0 ; i < nmboxes ; i++) { + p = padvance(&mpath, nullstr); + if (p == NULL) + break; + if (*p == '\0') + continue; + for (q = p ; *q ; q++); +#ifdef DEBUG + if (q[-1] != '/') + abort(); +#endif + q[-1] = '\0'; /* delete trailing '/' */ + if (stat(p, &statb) < 0) + statb.st_size = 0; + if (statb.st_size > mailtime[i] && ! silent) { + out2fmt(snlfmt, + pathopt? pathopt : "you have mail"); + } + mailtime[i] = statb.st_size; + } + nmboxes = i; + popstackmark(&smark); +} + +#define PROFILE 0 + +#if PROFILE +static short profile_buf[16384]; +extern int etext(); +#endif + +static void read_profile (const char *); +static void cmdloop (int); +static void options (int); +static void setoption (int, int); +static void procargs (int, char **); + + +/* + * Main routine. We initialize things, parse the arguments, execute + * profiles if we're a login shell, and then call cmdloop to execute + * commands. The setjmp call sets up the location to jump to when an + * exception occurs. When an exception occurs the variable "state" + * is used to figure out how far we had gotten. + */ + +int +ash_main(argc, argv) + int argc; + char **argv; +{ + struct jmploc jmploc; + struct stackmark smark; + volatile int state; + const char *shinit; + + BLTINCMD = find_builtin("builtin"); + EXECCMD = find_builtin("exec"); + EVALCMD = find_builtin("eval"); + +#ifndef BB_FEATURE_SH_FANCY_PROMPT + unsetenv("PS1"); + unsetenv("PS2"); +#endif + +#if PROFILE + monitor(4, etext, profile_buf, sizeof profile_buf, 50); +#endif +#if defined(linux) || defined(__GNU__) + signal(SIGCHLD, SIG_DFL); +#endif + state = 0; + if (setjmp(jmploc.loc)) { + INTOFF; + /* + * When a shell procedure is executed, we raise the + * exception EXSHELLPROC to clean up before executing + * the shell procedure. + */ + switch (exception) { + case EXSHELLPROC: + rootpid = getpid(); + rootshell = 1; + minusc = NULL; + state = 3; + break; + + case EXEXEC: + exitstatus = exerrno; + break; + + case EXERROR: + exitstatus = 2; + break; + + default: + break; + } + + if (exception != EXSHELLPROC) { + if (state == 0 || iflag == 0 || ! rootshell) + exitshell(exitstatus); + } + reset(); + if (exception == EXINT) { + out2c('\n'); + } + popstackmark(&smark); + FORCEINTON; /* enable interrupts */ + if (state == 1) + goto state1; + else if (state == 2) + goto state2; + else if (state == 3) + goto state3; + else + goto state4; + } + handler = &jmploc; +#ifdef DEBUG + opentrace(); + trputs("Shell args: "); trargs(argv); +#endif + rootpid = getpid(); + rootshell = 1; + init(); + setstackmark(&smark); + procargs(argc, argv); + if (argv[0] && argv[0][0] == '-') { + state = 1; + read_profile("/etc/profile"); +state1: + state = 2; + read_profile(".profile"); + } +state2: + state = 3; +#ifndef linux + if (getuid() == geteuid() && getgid() == getegid()) { +#endif + if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') { + state = 3; + read_profile(shinit); + } +#ifndef linux + } +#endif +state3: + state = 4; + if (sflag == 0 || minusc) { + static int sigs[] = { + SIGINT, SIGQUIT, SIGHUP, +#ifdef SIGTSTP + SIGTSTP, +#endif + SIGPIPE + }; +#define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0])) + int i; + + for (i = 0; i < SIGSSIZE; i++) + setsignal(sigs[i]); + } + + if (minusc) + evalstring(minusc, 0); + + if (sflag || minusc == NULL) { +state4: + cmdloop(1); + } +#if PROFILE + monitor(0); +#endif + exitshell(exitstatus); + /* NOTREACHED */ +} + + +/* + * Read and execute commands. "Top" is nonzero for the top level command + * loop; it turns on prompting if the shell is interactive. + */ + +static void +cmdloop(int top) +{ + union node *n; + struct stackmark smark; + int inter; + int numeof = 0; + + TRACE(("cmdloop(%d) called\n", top)); + setstackmark(&smark); + for (;;) { + if (pendingsigs) + dotrap(); + inter = 0; + if (iflag && top) { + inter++; + showjobs(1); + chkmail(0); + flushall(); + } + n = parsecmd(inter); + /* showtree(n); DEBUG */ + if (n == NEOF) { + if (!top || numeof >= 50) + break; + if (!stoppedjobs()) { + if (!Iflag) + break; + out2str("\nUse \"exit\" to leave shell.\n"); + } + numeof++; + } else if (n != NULL && nflag == 0) { + job_warning = (job_warning == 2) ? 1 : 0; + numeof = 0; + evaltree(n, 0); + } + popstackmark(&smark); + setstackmark(&smark); + if (evalskip == SKIPFILE) { + evalskip = 0; + break; + } + } + popstackmark(&smark); +} + + + +/* + * Read /etc/profile or .profile. Return on error. + */ + +static void +read_profile(name) + const char *name; +{ + int fd; + int xflag_set = 0; + int vflag_set = 0; + + INTOFF; + if ((fd = open(name, O_RDONLY)) >= 0) + setinputfd(fd, 1); + INTON; + if (fd < 0) + return; + /* -q turns off -x and -v just when executing init files */ + if (qflag) { + if (xflag) + xflag = 0, xflag_set = 1; + if (vflag) + vflag = 0, vflag_set = 1; + } + cmdloop(0); + if (qflag) { + if (xflag_set) + xflag = 1; + if (vflag_set) + vflag = 1; + } + popfile(); +} + + + +/* + * Read a file containing shell functions. + */ + +static void +readcmdfile(const char *name) +{ + int fd; + + INTOFF; + if ((fd = open(name, O_RDONLY)) >= 0) + setinputfd(fd, 1); + else + error("Can't open %s", name); + INTON; + cmdloop(0); + popfile(); +} + + + +/* + * Take commands from a file. To be compatable we should do a path + * search for the file, which is necessary to find sub-commands. + */ + + +static inline char * +find_dot_file(mybasename) + char *mybasename; +{ + char *fullname; + const char *path = pathval(); + struct stat statb; + + /* don't try this for absolute or relative paths */ + if (strchr(mybasename, '/')) + return mybasename; + + while ((fullname = padvance(&path, mybasename)) != NULL) { + if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { + /* + * Don't bother freeing here, since it will + * be freed by the caller. + */ + return fullname; + } + stunalloc(fullname); + } + + /* not found in the PATH */ + error("%s: not found", mybasename); + /* NOTREACHED */ +} + +static int +dotcmd(argc, argv) + int argc; + char **argv; +{ + struct strlist *sp; + exitstatus = 0; + + for (sp = cmdenviron; sp ; sp = sp->next) + setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED); + + if (argc >= 2) { /* That's what SVR2 does */ + char *fullname; + struct stackmark smark; + + setstackmark(&smark); + fullname = find_dot_file(argv[1]); + setinputfile(fullname, 1); + commandname = fullname; + cmdloop(0); + popfile(); + popstackmark(&smark); + } + return exitstatus; +} + + +static int +exitcmd(argc, argv) + int argc; + char **argv; +{ + if (stoppedjobs()) + return 0; + if (argc > 1) + exitstatus = number(argv[1]); + else + exitstatus = oexitstatus; + exitshell(exitstatus); + /* NOTREACHED */ +} + +static pointer +stalloc(int nbytes) +{ + char *p; + + nbytes = ALIGN(nbytes); + if (nbytes > stacknleft) { + int blocksize; + struct stack_block *sp; + + blocksize = nbytes; + if (blocksize < MINSIZE) + blocksize = MINSIZE; + INTOFF; + sp = ckmalloc(sizeof(struct stack_block) - MINSIZE + blocksize); + sp->prev = stackp; + stacknxt = sp->space; + stacknleft = blocksize; + stackp = sp; + INTON; + } + p = stacknxt; + stacknxt += nbytes; + stacknleft -= nbytes; + return p; +} + + +static void +stunalloc(pointer p) +{ +#ifdef DEBUG + if (p == NULL) { /*DEBUG */ + write(2, "stunalloc\n", 10); + abort(); + } +#endif + if (!(stacknxt >= (char *)p && (char *)p >= stackp->space)) { + p = stackp->space; + } + stacknleft += stacknxt - (char *)p; + stacknxt = p; +} + + +static void +setstackmark(struct stackmark *mark) +{ + mark->stackp = stackp; + mark->stacknxt = stacknxt; + mark->stacknleft = stacknleft; + mark->marknext = markp; + markp = mark; +} + + +static void +popstackmark(struct stackmark *mark) +{ + struct stack_block *sp; + + INTOFF; + markp = mark->marknext; + while (stackp != mark->stackp) { + sp = stackp; + stackp = sp->prev; + ckfree(sp); + } + stacknxt = mark->stacknxt; + stacknleft = mark->stacknleft; + INTON; +} + + +/* + * When the parser reads in a string, it wants to stick the string on the + * stack and only adjust the stack pointer when it knows how big the + * string is. Stackblock (defined in stack.h) returns a pointer to a block + * of space on top of the stack and stackblocklen returns the length of + * this block. Growstackblock will grow this space by at least one byte, + * possibly moving it (like realloc). Grabstackblock actually allocates the + * part of the block that has been used. + */ + +static void +growstackblock(void) { + char *p; + int newlen = ALIGN(stacknleft * 2 + 100); + char *oldspace = stacknxt; + int oldlen = stacknleft; + struct stack_block *sp; + struct stack_block *oldstackp; + + if (stacknxt == stackp->space && stackp != &stackbase) { + INTOFF; + oldstackp = stackp; + sp = stackp; + stackp = sp->prev; + sp = ckrealloc((pointer)sp, sizeof(struct stack_block) - MINSIZE + newlen); + sp->prev = stackp; + stackp = sp; + stacknxt = sp->space; + stacknleft = newlen; + { + /* Stack marks pointing to the start of the old block + * must be relocated to point to the new block + */ + struct stackmark *xmark; + xmark = markp; + while (xmark != NULL && xmark->stackp == oldstackp) { + xmark->stackp = stackp; + xmark->stacknxt = stacknxt; + xmark->stacknleft = stacknleft; + xmark = xmark->marknext; + } + } + INTON; + } else { + p = stalloc(newlen); + memcpy(p, oldspace, oldlen); + stacknxt = p; /* free the space */ + stacknleft += newlen; /* we just allocated */ + } +} + + + +static inline void +grabstackblock(int len) +{ + len = ALIGN(len); + stacknxt += len; + stacknleft -= len; +} + + + +/* + * The following routines are somewhat easier to use that the above. + * The user declares a variable of type STACKSTR, which may be declared + * to be a register. The macro STARTSTACKSTR initializes things. Then + * the user uses the macro STPUTC to add characters to the string. In + * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is + * grown as necessary. When the user is done, she can just leave the + * string there and refer to it using stackblock(). Or she can allocate + * the space for it using grabstackstr(). If it is necessary to allow + * someone else to use the stack temporarily and then continue to grow + * the string, the user should use grabstack to allocate the space, and + * then call ungrabstr(p) to return to the previous mode of operation. + * + * USTPUTC is like STPUTC except that it doesn't check for overflow. + * CHECKSTACKSPACE can be called before USTPUTC to ensure that there + * is space for at least one character. + */ + + +static char * +growstackstr(void) { + int len = stackblocksize(); + if (herefd >= 0 && len >= 1024) { + xwrite(herefd, stackblock(), len); + sstrnleft = len - 1; + return stackblock(); + } + growstackblock(); + sstrnleft = stackblocksize() - len - 1; + return stackblock() + len; +} + + +/* + * Called from CHECKSTRSPACE. + */ + +static char * +makestrspace(size_t newlen) { + int len = stackblocksize() - sstrnleft; + do { + growstackblock(); + sstrnleft = stackblocksize() - len; + } while (sstrnleft < newlen); + return stackblock() + len; +} + + + +static void +ungrabstackstr(char *s, char *p) +{ + stacknleft += stacknxt - s; + stacknxt = s; + sstrnleft = stacknleft - (p - s); +} +/* + * Miscelaneous builtins. + */ + + +#undef rflag + +//#ifdef __GLIBC__ +static mode_t getmode(const void *, mode_t); +static void *setmode(const char *); +//#endif + +#if !defined(__GLIBC__) || __GLIBC__ == 2 && __GLIBC_MINOR__ < 1 +typedef long rlim_t; +#endif + + + +/* + * The read builtin. The -e option causes backslashes to escape the + * following character. + * + * This uses unbuffered input, which may be avoidable in some cases. + */ + +static int +readcmd(argc, argv) + int argc; + char **argv; +{ + char **ap; + int backslash; + char c; + int rflag; + char *prompt; + const char *ifs; + char *p; + int startword; + int status; + int i; + + rflag = 0; + prompt = NULL; + while ((i = nextopt("p:r")) != '\0') { + if (i == 'p') + prompt = optionarg; + else + rflag = 1; + } + if (prompt && isatty(0)) { + putprompt(prompt); + flushall(); + } + if (*(ap = argptr) == NULL) + error("arg count"); + if ((ifs = bltinlookup("IFS")) == NULL) + ifs = defifs; + status = 0; + startword = 1; + backslash = 0; + STARTSTACKSTR(p); + for (;;) { + if (read(0, &c, 1) != 1) { + status = 1; + break; + } + if (c == '\0') + continue; + if (backslash) { + backslash = 0; + if (c != '\n') + STPUTC(c, p); + continue; + } + if (!rflag && c == '\\') { + backslash++; + continue; + } + if (c == '\n') + break; + if (startword && *ifs == ' ' && strchr(ifs, c)) { + continue; + } + startword = 0; + if (backslash && c == '\\') { + if (read(0, &c, 1) != 1) { + status = 1; + break; + } + STPUTC(c, p); + } else if (ap[1] != NULL && strchr(ifs, c) != NULL) { + STACKSTRNUL(p); + setvar(*ap, stackblock(), 0); + ap++; + startword = 1; + STARTSTACKSTR(p); + } else { + STPUTC(c, p); + } + } + STACKSTRNUL(p); + /* Remove trailing blanks */ + while (stackblock() <= --p && strchr(ifs, *p) != NULL) + *p = '\0'; + setvar(*ap, stackblock(), 0); + while (*++ap != NULL) + setvar(*ap, nullstr, 0); + return status; +} + + + +static int +umaskcmd(argc, argv) + int argc; + char **argv; +{ + char *ap; + int mask; + int i; + int symbolic_mode = 0; + + while (nextopt("S") != '\0') { + symbolic_mode = 1; + } + + INTOFF; + mask = umask(0); + umask(mask); + INTON; + + if ((ap = *argptr) == NULL) { + if (symbolic_mode) { + char u[4], g[4], o[4]; + + i = 0; + if ((mask & S_IRUSR) == 0) + u[i++] = 'r'; + if ((mask & S_IWUSR) == 0) + u[i++] = 'w'; + if ((mask & S_IXUSR) == 0) + u[i++] = 'x'; + u[i] = '\0'; + + i = 0; + if ((mask & S_IRGRP) == 0) + g[i++] = 'r'; + if ((mask & S_IWGRP) == 0) + g[i++] = 'w'; + if ((mask & S_IXGRP) == 0) + g[i++] = 'x'; + g[i] = '\0'; + + i = 0; + if ((mask & S_IROTH) == 0) + o[i++] = 'r'; + if ((mask & S_IWOTH) == 0) + o[i++] = 'w'; + if ((mask & S_IXOTH) == 0) + o[i++] = 'x'; + o[i] = '\0'; + + printf("u=%s,g=%s,o=%s\n", u, g, o); + } else { + printf("%.4o\n", mask); + } + } else { + if (is_digit((unsigned char)*ap)) { + mask = 0; + do { + if (*ap >= '8' || *ap < '0') + error("Illegal number: %s", argv[1]); + mask = (mask << 3) + (*ap - '0'); + } while (*++ap != '\0'); + umask(mask); + } else { + void *set; + + INTOFF; + if ((set = setmode(ap)) != 0) { + mask = getmode(set, ~mask & 0777); + ckfree(set); + } + INTON; + if (!set) + error("Illegal mode: %s", ap); + + umask(~mask & 0777); + } + } + return 0; +} + +/* + * ulimit builtin + * + * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and + * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with + * ash by J.T. Conklin. + * + * Public domain. + */ + +struct limits { + const char *name; + int cmd; + int factor; /* multiply by to get rlim_{cur,max} values */ + char option; +}; + +static const struct limits limits[] = { +#ifdef RLIMIT_CPU + { "time(seconds)", RLIMIT_CPU, 1, 't' }, +#endif +#ifdef RLIMIT_FSIZE + { "file(blocks)", RLIMIT_FSIZE, 512, 'f' }, +#endif +#ifdef RLIMIT_DATA + { "data(kbytes)", RLIMIT_DATA, 1024, 'd' }, +#endif +#ifdef RLIMIT_STACK + { "stack(kbytes)", RLIMIT_STACK, 1024, 's' }, +#endif +#ifdef RLIMIT_CORE + { "coredump(blocks)", RLIMIT_CORE, 512, 'c' }, +#endif +#ifdef RLIMIT_RSS + { "memory(kbytes)", RLIMIT_RSS, 1024, 'm' }, +#endif +#ifdef RLIMIT_MEMLOCK + { "locked memory(kbytes)", RLIMIT_MEMLOCK, 1024, 'l' }, +#endif +#ifdef RLIMIT_NPROC + { "process(processes)", RLIMIT_NPROC, 1, 'p' }, +#endif +#ifdef RLIMIT_NOFILE + { "nofiles(descriptors)", RLIMIT_NOFILE, 1, 'n' }, +#endif +#ifdef RLIMIT_VMEM + { "vmemory(kbytes)", RLIMIT_VMEM, 1024, 'v' }, +#endif +#ifdef RLIMIT_SWAP + { "swap(kbytes)", RLIMIT_SWAP, 1024, 'w' }, +#endif + { (char *) 0, 0, 0, '\0' } +}; + +static int +ulimitcmd(argc, argv) + int argc; + char **argv; +{ + int c; + rlim_t val = 0; + enum { SOFT = 0x1, HARD = 0x2 } + how = SOFT | HARD; + const struct limits *l; + int set, all = 0; + int optc, what; + struct rlimit limit; + + what = 'f'; + while ((optc = nextopt("HSatfdsmcnpl")) != '\0') + switch (optc) { + case 'H': + how = HARD; + break; + case 'S': + how = SOFT; + break; + case 'a': + all = 1; + break; + default: + what = optc; + } + + for (l = limits; l->name && l->option != what; l++) + ; + if (!l->name) + error("internal error (%c)", what); + + set = *argptr ? 1 : 0; + if (set) { + char *p = *argptr; + + if (all || argptr[1]) + error("too many arguments"); + if (strcmp(p, "unlimited") == 0) + val = RLIM_INFINITY; + else { + val = (rlim_t) 0; + + while ((c = *p++) >= '0' && c <= '9') + { + val = (val * 10) + (long)(c - '0'); + if (val < (rlim_t) 0) + break; + } + if (c) + error("bad number"); + val *= l->factor; + } + } + if (all) { + for (l = limits; l->name; l++) { + getrlimit(l->cmd, &limit); + if (how & SOFT) + val = limit.rlim_cur; + else if (how & HARD) + val = limit.rlim_max; + + printf("%-20s ", l->name); + if (val == RLIM_INFINITY) + printf("unlimited\n"); + else + { + val /= l->factor; + printf("%lld\n", (long long) val); + } + } + return 0; + } + + getrlimit(l->cmd, &limit); + if (set) { + if (how & HARD) + limit.rlim_max = val; + if (how & SOFT) + limit.rlim_cur = val; + if (setrlimit(l->cmd, &limit) < 0) + error("error setting limit (%m)"); + } else { + if (how & SOFT) + val = limit.rlim_cur; + else if (how & HARD) + val = limit.rlim_max; + + if (val == RLIM_INFINITY) + printf("unlimited\n"); + else + { + val /= l->factor; + printf("%lld\n", (long long) val); + } + } + return 0; +} +/* + * prefix -- see if pfx is a prefix of string. + */ + +static int +prefix(char const *pfx, char const *string) +{ + while (*pfx) { + if (*pfx++ != *string++) + return 0; + } + return 1; +} + +/* + * Return true if s is a string of digits, and save munber in intptr + * nagative is bad + */ + +static int +is_number(const char *p, int *intptr) +{ + int ret = 0; + + do { + if (! is_digit(*p)) + return 0; + ret *= 10; + ret += digit_val(*p); + p++; + } while (*p != '\0'); + + *intptr = ret; + return 1; +} + +/* + * Convert a string of digits to an integer, printing an error message on + * failure. + */ + +static int +number(const char *s) +{ + int i; + if (! is_number(s, &i)) + error("Illegal number: %s", s); + return i; +} + +/* + * Produce a possibly single quoted string suitable as input to the shell. + * The return string is allocated on the stack. + */ + +static char * +single_quote(const char *s) { + char *p; + + STARTSTACKSTR(p); + + do { + char *q = p; + size_t len1, len1p, len2, len2p; + + len1 = strcspn(s, "'"); + len2 = strspn(s + len1, "'"); + + len1p = len1 ? len1 + 2 : len1; + switch (len2) { + case 0: + len2p = 0; + break; + case 1: + len2p = 2; + break; + default: + len2p = len2 + 2; + } + + CHECKSTRSPACE(len1p + len2p + 1, p); + + if (len1) { + *p = '\''; + q = p + 1 + len1; + memcpy(p + 1, s, len1); + *q++ = '\''; + s += len1; + } + + switch (len2) { + case 0: + break; + case 1: + *q++ = '\\'; + *q = '\''; + s++; + break; + default: + *q = '"'; + q += 1 + len2; + memcpy(q + 1, s, len2); + *q = '"'; + s += len2; + } + + STADJUST(len1p + len2p, p); + } while (*s); + + USTPUTC(0, p); + + return grabstackstr(p); +} + +/* + * Like strdup but works with the ash stack. + */ + +static char * +sstrdup(const char *p) +{ + size_t len = strlen(p) + 1; + return memcpy(stalloc(len), p, len); +} + + +/* + * Routine for dealing with parsed shell commands. + */ + + +static void sizenodelist (const struct nodelist *); +static struct nodelist *copynodelist (const struct nodelist *); +static char *nodesavestr (const char *); + +static void +calcsize(const union node *n) +{ + if (n == NULL) + return; + funcblocksize += nodesize[n->type]; + switch (n->type) { + case NSEMI: + case NAND: + case NOR: + case NWHILE: + case NUNTIL: + calcsize(n->nbinary.ch2); + calcsize(n->nbinary.ch1); + break; + case NCMD: + calcsize(n->ncmd.redirect); + calcsize(n->ncmd.args); + calcsize(n->ncmd.assign); + break; + case NPIPE: + sizenodelist(n->npipe.cmdlist); + break; + case NREDIR: + case NBACKGND: + case NSUBSHELL: + calcsize(n->nredir.redirect); + calcsize(n->nredir.n); + break; + case NIF: + calcsize(n->nif.elsepart); + calcsize(n->nif.ifpart); + calcsize(n->nif.test); + break; + case NFOR: + funcstringsize += strlen(n->nfor.var) + 1; + calcsize(n->nfor.body); + calcsize(n->nfor.args); + break; + case NCASE: + calcsize(n->ncase.cases); + calcsize(n->ncase.expr); + break; + case NCLIST: + calcsize(n->nclist.body); + calcsize(n->nclist.pattern); + calcsize(n->nclist.next); + break; + case NDEFUN: + case NARG: + sizenodelist(n->narg.backquote); + funcstringsize += strlen(n->narg.text) + 1; + calcsize(n->narg.next); + break; + case NTO: + case NFROM: + case NFROMTO: + case NAPPEND: + case NTOOV: + calcsize(n->nfile.fname); + calcsize(n->nfile.next); + break; + case NTOFD: + case NFROMFD: + calcsize(n->ndup.vname); + calcsize(n->ndup.next); + break; + case NHERE: + case NXHERE: + calcsize(n->nhere.doc); + calcsize(n->nhere.next); + break; + case NNOT: + calcsize(n->nnot.com); + break; + }; +} + +static void +sizenodelist(const struct nodelist *lp) +{ + while (lp) { + funcblocksize += ALIGN(sizeof(struct nodelist)); + calcsize(lp->n); + lp = lp->next; + } +} + + +static union node * +copynode(const union node *n) +{ + union node *new; + + if (n == NULL) + return NULL; + new = funcblock; + funcblock = (char *) funcblock + nodesize[n->type]; + switch (n->type) { + case NSEMI: + case NAND: + case NOR: + case NWHILE: + case NUNTIL: + new->nbinary.ch2 = copynode(n->nbinary.ch2); + new->nbinary.ch1 = copynode(n->nbinary.ch1); + break; + case NCMD: + new->ncmd.redirect = copynode(n->ncmd.redirect); + new->ncmd.args = copynode(n->ncmd.args); + new->ncmd.assign = copynode(n->ncmd.assign); + new->ncmd.backgnd = n->ncmd.backgnd; + break; + case NPIPE: + new->npipe.cmdlist = copynodelist(n->npipe.cmdlist); + new->npipe.backgnd = n->npipe.backgnd; + break; + case NREDIR: + case NBACKGND: + case NSUBSHELL: + new->nredir.redirect = copynode(n->nredir.redirect); + new->nredir.n = copynode(n->nredir.n); + break; + case NIF: + new->nif.elsepart = copynode(n->nif.elsepart); + new->nif.ifpart = copynode(n->nif.ifpart); + new->nif.test = copynode(n->nif.test); + break; + case NFOR: + new->nfor.var = nodesavestr(n->nfor.var); + new->nfor.body = copynode(n->nfor.body); + new->nfor.args = copynode(n->nfor.args); + break; + case NCASE: + new->ncase.cases = copynode(n->ncase.cases); + new->ncase.expr = copynode(n->ncase.expr); + break; + case NCLIST: + new->nclist.body = copynode(n->nclist.body); + new->nclist.pattern = copynode(n->nclist.pattern); + new->nclist.next = copynode(n->nclist.next); + break; + case NDEFUN: + case NARG: + new->narg.backquote = copynodelist(n->narg.backquote); + new->narg.text = nodesavestr(n->narg.text); + new->narg.next = copynode(n->narg.next); + break; + case NTO: + case NFROM: + case NFROMTO: + case NAPPEND: + case NTOOV: + new->nfile.fname = copynode(n->nfile.fname); + new->nfile.fd = n->nfile.fd; + new->nfile.next = copynode(n->nfile.next); + break; + case NTOFD: + case NFROMFD: + new->ndup.vname = copynode(n->ndup.vname); + new->ndup.dupfd = n->ndup.dupfd; + new->ndup.fd = n->ndup.fd; + new->ndup.next = copynode(n->ndup.next); + break; + case NHERE: + case NXHERE: + new->nhere.doc = copynode(n->nhere.doc); + new->nhere.fd = n->nhere.fd; + new->nhere.next = copynode(n->nhere.next); + break; + case NNOT: + new->nnot.com = copynode(n->nnot.com); + break; + }; + new->type = n->type; + return new; +} + + +static struct nodelist * +copynodelist(const struct nodelist *lp) +{ + struct nodelist *start; + struct nodelist **lpp; + + lpp = &start; + while (lp) { + *lpp = funcblock; + funcblock = (char *) funcblock + ALIGN(sizeof(struct nodelist)); + (*lpp)->n = copynode(lp->n); + lp = lp->next; + lpp = &(*lpp)->next; + } + *lpp = NULL; + return start; +} + + +static char * +nodesavestr(const char *s) +{ + const char *p = s; + char *q = funcstring; + char *rtn = funcstring; + + while ((*q++ = *p++) != '\0') + continue; + funcstring = q; + return rtn; +} + +#ifdef ASH_GETOPTS +static int getopts (char *, char *, char **, int *, int *); +#endif + + +/* + * Process the shell command line arguments. + */ + +static void +procargs(argc, argv) + int argc; + char **argv; +{ + int i; + + argptr = argv; + if (argc > 0) + argptr++; + for (i = 0; i < NOPTS; i++) + optent_val(i) = 2; + options(1); + if (*argptr == NULL && minusc == NULL) + sflag = 1; + if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) + iflag = 1; + if (mflag == 2) + mflag = iflag; + for (i = 0; i < NOPTS; i++) + if (optent_val(i) == 2) + optent_val(i) = 0; + arg0 = argv[0]; + if (sflag == 0 && minusc == NULL) { + commandname = argv[0]; + arg0 = *argptr++; + setinputfile(arg0, 0); + commandname = arg0; + } + /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ + if (argptr && minusc && *argptr) + arg0 = *argptr++; + + shellparam.p = argptr; + shellparam.optind = 1; + shellparam.optoff = -1; + /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ + while (*argptr) { + shellparam.nparam++; + argptr++; + } + optschanged(); +} + + + +/* + * Process shell options. The global variable argptr contains a pointer + * to the argument list; we advance it past the options. + */ + +static inline void +minus_o(const char *name, int val) +{ + int i; + + if (name == NULL) { + out1str("Current option settings\n"); + for (i = 0; i < NOPTS; i++) + printf("%-16s%s\n", optent_name(optlist[i]), + optent_val(i) ? "on" : "off"); + } else { + for (i = 0; i < NOPTS; i++) + if (equal(name, optent_name(optlist[i]))) { + setoption(optent_letter(optlist[i]), val); + return; + } + error("Illegal option -o %s", name); + } +} + + +static void +options(int cmdline) +{ + char *p; + int val; + int c; + + if (cmdline) + minusc = NULL; + while ((p = *argptr) != NULL) { + argptr++; + if ((c = *p++) == '-') { + val = 1; + if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) { + if (!cmdline) { + /* "-" means turn off -x and -v */ + if (p[0] == '\0') + xflag = vflag = 0; + /* "--" means reset params */ + else if (*argptr == NULL) + setparam(argptr); + } + break; /* "-" or "--" terminates options */ + } + } else if (c == '+') { + val = 0; + } else { + argptr--; + break; + } + while ((c = *p++) != '\0') { + if (c == 'c' && cmdline) { + char *q; +#ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ + if (*p == '\0') +#endif + q = *argptr++; + if (q == NULL || minusc != NULL) + error("Bad -c option"); + minusc = q; +#ifdef NOHACK + break; +#endif + } else if (c == 'o') { + minus_o(*argptr, val); + if (*argptr) + argptr++; + } else { + setoption(c, val); + } + } + } +} + + +static void +setoption(int flag, int val) +{ + int i; + + for (i = 0; i < NOPTS; i++) + if (optent_letter(optlist[i]) == flag) { + optent_val(i) = val; + if (val) { + /* #%$ hack for ksh semantics */ + if (flag == 'V') + Eflag = 0; + else if (flag == 'E') + Vflag = 0; + } + return; + } + error("Illegal option -%c", flag); + /* NOTREACHED */ +} + + + +/* + * Set the shell parameters. + */ + +static void +setparam(char **argv) +{ + char **newparam; + char **ap; + int nparam; + + for (nparam = 0 ; argv[nparam] ; nparam++); + ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); + while (*argv) { + *ap++ = savestr(*argv++); + } + *ap = NULL; + freeparam(&shellparam); + shellparam.malloc = 1; + shellparam.nparam = nparam; + shellparam.p = newparam; + shellparam.optind = 1; + shellparam.optoff = -1; +} + + +/* + * Free the list of positional parameters. + */ + +static void +freeparam(volatile struct shparam *param) +{ + char **ap; + + if (param->malloc) { + for (ap = param->p ; *ap ; ap++) + ckfree(*ap); + ckfree(param->p); + } +} + + + +/* + * The shift builtin command. + */ + +static int +shiftcmd(argc, argv) + int argc; + char **argv; +{ + int n; + char **ap1, **ap2; + + n = 1; + if (argc > 1) + n = number(argv[1]); + if (n > shellparam.nparam) + error("can't shift that many"); + INTOFF; + shellparam.nparam -= n; + for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { + if (shellparam.malloc) + ckfree(*ap1); + } + ap2 = shellparam.p; + while ((*ap2++ = *ap1++) != NULL); + shellparam.optind = 1; + shellparam.optoff = -1; + INTON; + return 0; +} + + + +/* + * The set command builtin. + */ + +static int +setcmd(argc, argv) + int argc; + char **argv; +{ + if (argc == 1) + return showvarscmd(argc, argv); + INTOFF; + options(0); + optschanged(); + if (*argptr != NULL) { + setparam(argptr); + } + INTON; + return 0; +} + + +static void +getoptsreset(const char *value) +{ + shellparam.optind = number(value); + shellparam.optoff = -1; +} + +#ifdef BB_LOCALE_SUPPORT +static void change_lc_all(const char *value) +{ + if(value != 0 && *value != 0) + setlocale(LC_ALL, value); +} + +static void change_lc_ctype(const char *value) +{ + if(value != 0 && *value != 0) + setlocale(LC_CTYPE, value); +} + +#endif + +#ifdef ASH_GETOPTS +/* + * The getopts builtin. Shellparam.optnext points to the next argument + * to be processed. Shellparam.optptr points to the next character to + * be processed in the current argument. If shellparam.optnext is NULL, + * then it's the first time getopts has been called. + */ + +static int +getoptscmd(argc, argv) + int argc; + char **argv; +{ + char **optbase; + + if (argc < 3) + error("Usage: getopts optstring var [arg]"); + else if (argc == 3) { + optbase = shellparam.p; + if (shellparam.optind > shellparam.nparam + 1) { + shellparam.optind = 1; + shellparam.optoff = -1; + } + } + else { + optbase = &argv[3]; + if (shellparam.optind > argc - 2) { + shellparam.optind = 1; + shellparam.optoff = -1; + } + } + + return getopts(argv[1], argv[2], optbase, &shellparam.optind, + &shellparam.optoff); +} + +/* + * Safe version of setvar, returns 1 on success 0 on failure. + */ + +static int +setvarsafe(name, val, flags) + const char *name, *val; + int flags; +{ + struct jmploc jmploc; + struct jmploc *volatile savehandler = handler; + int err = 0; +#ifdef __GNUC__ + (void) &err; +#endif + + if (setjmp(jmploc.loc)) + err = 1; + else { + handler = &jmploc; + setvar(name, val, flags); + } + handler = savehandler; + return err; +} + +static int +getopts(optstr, optvar, optfirst, myoptind, optoff) + char *optstr; + char *optvar; + char **optfirst; + int *myoptind; + int *optoff; +{ + char *p, *q; + char c = '?'; + int done = 0; + int err = 0; + char s[10]; + char **optnext = optfirst + *myoptind - 1; + + if (*myoptind <= 1 || *optoff < 0 || !(*(optnext - 1)) || + strlen(*(optnext - 1)) < *optoff) + p = NULL; + else + p = *(optnext - 1) + *optoff; + if (p == NULL || *p == '\0') { + /* Current word is done, advance */ + if (optnext == NULL) + return 1; + p = *optnext; + if (p == NULL || *p != '-' || *++p == '\0') { +atend: + *myoptind = optnext - optfirst + 1; + p = NULL; + done = 1; + goto out; + } + optnext++; + if (p[0] == '-' && p[1] == '\0') /* check for "--" */ + goto atend; + } + + c = *p++; + for (q = optstr; *q != c; ) { + if (*q == '\0') { + if (optstr[0] == ':') { + s[0] = c; + s[1] = '\0'; + err |= setvarsafe("OPTARG", s, 0); + } + else { + out2fmt("Illegal option -%c\n", c); + (void) unsetvar("OPTARG"); + } + c = '?'; + goto bad; + } + if (*++q == ':') + q++; + } + + if (*++q == ':') { + if (*p == '\0' && (p = *optnext) == NULL) { + if (optstr[0] == ':') { + s[0] = c; + s[1] = '\0'; + err |= setvarsafe("OPTARG", s, 0); + c = ':'; + } + else { + out2fmt("No arg for -%c option\n", c); + (void) unsetvar("OPTARG"); + c = '?'; + } + goto bad; + } + + if (p == *optnext) + optnext++; + setvarsafe("OPTARG", p, 0); + p = NULL; + } + else + setvarsafe("OPTARG", "", 0); + *myoptind = optnext - optfirst + 1; + goto out; + +bad: + *myoptind = 1; + p = NULL; +out: + *optoff = p ? p - *(optnext - 1) : -1; + snprintf(s, sizeof(s), "%d", *myoptind); + err |= setvarsafe("OPTIND", s, VNOFUNC); + s[0] = c; + s[1] = '\0'; + err |= setvarsafe(optvar, s, 0); + if (err) { + *myoptind = 1; + *optoff = -1; + exraise(EXERROR); + } + return done; +} +#endif + + +static int +nextopt(const char *optstring) +{ + char *p; + const char *q; + char c; + + if ((p = optptr) == NULL || *p == '\0') { + p = *argptr; + if (p == NULL || *p != '-' || *++p == '\0') + return '\0'; + argptr++; + if (p[0] == '-' && p[1] == '\0') /* check for "--" */ + return '\0'; + } + c = *p++; + for (q = optstring ; *q != c ; ) { + if (*q == '\0') + error("Illegal option -%c", c); + if (*++q == ':') + q++; + } + if (*++q == ':') { + if (*p == '\0' && (p = *argptr++) == NULL) + error("No arg for -%c option", c); + optionarg = p; + p = NULL; + } + optptr = p; + return c; +} + +static void +flushall() { + INTOFF; + fflush(stdout); + INTON; +} + + +static void +out2fmt(const char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); +} + +/* + * Version of write which resumes after a signal is caught. + */ + +static int +xwrite(int fd, const char *buf, int nbytes) +{ + int ntry; + int i; + int n; + + n = nbytes; + ntry = 0; + for (;;) { + i = write(fd, buf, n); + if (i > 0) { + if ((n -= i) <= 0) + return nbytes; + buf += i; + ntry = 0; + } else if (i == 0) { + if (++ntry > 10) + return nbytes - n; + } else if (errno != EINTR) { + return -1; + } + } +} + + +/* + * Shell command parser. + */ + +#define EOFMARKLEN 79 + + + +struct heredoc { + struct heredoc *next; /* next here document in list */ + union node *here; /* redirection node */ + char *eofmark; /* string indicating end of input */ + int striptabs; /* if set, strip leading tabs */ +}; + +static struct heredoc *heredoclist; /* list of here documents to read */ +static int parsebackquote; /* nonzero if we are inside backquotes */ +static int doprompt; /* if set, prompt the user */ +static int needprompt; /* true if interactive and at start of line */ +static int lasttoken; /* last token read */ + +static char *wordtext; /* text of last word returned by readtoken */ + +static struct nodelist *backquotelist; +static union node *redirnode; +static struct heredoc *heredoc; +static int quoteflag; /* set if (part of) last token was quoted */ +static int startlinno; /* line # where last token started */ + + +static union node *list (int); +static union node *andor (void); +static union node *pipeline (void); +static union node *command (void); +static union node *simplecmd (void); +static void parsefname (void); +static void parseheredoc (void); +static int peektoken (void); +static int readtoken (void); +static int xxreadtoken (void); +static int readtoken1 (int, char const *, char *, int); +static int noexpand (char *); +static void synexpect (int) __attribute__((noreturn)); +static void synerror (const char *) __attribute__((noreturn)); +static void setprompt (int); + + +/* + * Read and parse a command. Returns NEOF on end of file. (NULL is a + * valid parse tree indicating a blank line.) + */ + +static union node * +parsecmd(int interact) +{ + int t; + + tokpushback = 0; + doprompt = interact; + if (doprompt) + setprompt(1); + else + setprompt(0); + needprompt = 0; + t = readtoken(); + if (t == TEOF) + return NEOF; + if (t == TNL) + return NULL; + tokpushback++; + return list(1); +} + + +static union node * +list(nlflag) + int nlflag; +{ + union node *n1, *n2, *n3; + int tok; + + checkkwd = 2; + if (nlflag == 0 && tokendlist[peektoken()]) + return NULL; + n1 = NULL; + for (;;) { + n2 = andor(); + tok = readtoken(); + if (tok == TBACKGND) { + if (n2->type == NCMD || n2->type == NPIPE) { + n2->ncmd.backgnd = 1; + } else if (n2->type == NREDIR) { + n2->type = NBACKGND; + } else { + n3 = (union node *)stalloc(sizeof (struct nredir)); + n3->type = NBACKGND; + n3->nredir.n = n2; + n3->nredir.redirect = NULL; + n2 = n3; + } + } + if (n1 == NULL) { + n1 = n2; + } + else { + n3 = (union node *)stalloc(sizeof (struct nbinary)); + n3->type = NSEMI; + n3->nbinary.ch1 = n1; + n3->nbinary.ch2 = n2; + n1 = n3; + } + switch (tok) { + case TBACKGND: + case TSEMI: + tok = readtoken(); + /* fall through */ + case TNL: + if (tok == TNL) { + parseheredoc(); + if (nlflag) + return n1; + } else { + tokpushback++; + } + checkkwd = 2; + if (tokendlist[peektoken()]) + return n1; + break; + case TEOF: + if (heredoclist) + parseheredoc(); + else + pungetc(); /* push back EOF on input */ + return n1; + default: + if (nlflag) + synexpect(-1); + tokpushback++; + return n1; + } + } +} + + + +static union node * +andor() { + union node *n1, *n2, *n3; + int t; + + checkkwd = 1; + n1 = pipeline(); + for (;;) { + if ((t = readtoken()) == TAND) { + t = NAND; + } else if (t == TOR) { + t = NOR; + } else { + tokpushback++; + return n1; + } + checkkwd = 2; + n2 = pipeline(); + n3 = (union node *)stalloc(sizeof (struct nbinary)); + n3->type = t; + n3->nbinary.ch1 = n1; + n3->nbinary.ch2 = n2; + n1 = n3; + } +} + + + +static union node * +pipeline() { + union node *n1, *n2, *pipenode; + struct nodelist *lp, *prev; + int negate; + + negate = 0; + TRACE(("pipeline: entered\n")); + if (readtoken() == TNOT) { + negate = !negate; + checkkwd = 1; + } else + tokpushback++; + n1 = command(); + if (readtoken() == TPIPE) { + pipenode = (union node *)stalloc(sizeof (struct npipe)); + pipenode->type = NPIPE; + pipenode->npipe.backgnd = 0; + lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); + pipenode->npipe.cmdlist = lp; + lp->n = n1; + do { + prev = lp; + lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); + checkkwd = 2; + lp->n = command(); + prev->next = lp; + } while (readtoken() == TPIPE); + lp->next = NULL; + n1 = pipenode; + } + tokpushback++; + if (negate) { + n2 = (union node *)stalloc(sizeof (struct nnot)); + n2->type = NNOT; + n2->nnot.com = n1; + return n2; + } else + return n1; +} + + + +static union node * +command() { + union node *n1, *n2; + union node *ap, **app; + union node *cp, **cpp; + union node *redir, **rpp; + int t; + + redir = NULL; + n1 = NULL; + rpp = &redir; + + switch (readtoken()) { + case TIF: + n1 = (union node *)stalloc(sizeof (struct nif)); + n1->type = NIF; + n1->nif.test = list(0); + if (readtoken() != TTHEN) + synexpect(TTHEN); + n1->nif.ifpart = list(0); + n2 = n1; + while (readtoken() == TELIF) { + n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); + n2 = n2->nif.elsepart; + n2->type = NIF; + n2->nif.test = list(0); + if (readtoken() != TTHEN) + synexpect(TTHEN); + n2->nif.ifpart = list(0); + } + if (lasttoken == TELSE) + n2->nif.elsepart = list(0); + else { + n2->nif.elsepart = NULL; + tokpushback++; + } + if (readtoken() != TFI) + synexpect(TFI); + checkkwd = 1; + break; + case TWHILE: + case TUNTIL: { + int got; + n1 = (union node *)stalloc(sizeof (struct nbinary)); + n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; + n1->nbinary.ch1 = list(0); + if ((got=readtoken()) != TDO) { +TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); + synexpect(TDO); + } + n1->nbinary.ch2 = list(0); + if (readtoken() != TDONE) + synexpect(TDONE); + checkkwd = 1; + break; + } + case TFOR: + if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) + synerror("Bad for loop variable"); + n1 = (union node *)stalloc(sizeof (struct nfor)); + n1->type = NFOR; + n1->nfor.var = wordtext; + checkkwd = 1; + if (readtoken() == TIN) { + app = ≈ + while (readtoken() == TWORD) { + n2 = (union node *)stalloc(sizeof (struct narg)); + n2->type = NARG; + n2->narg.text = wordtext; + n2->narg.backquote = backquotelist; + *app = n2; + app = &n2->narg.next; + } + *app = NULL; + n1->nfor.args = ap; + if (lasttoken != TNL && lasttoken != TSEMI) + synexpect(-1); + } else { + static char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE, + '@', '=', '\0'}; + n2 = (union node *)stalloc(sizeof (struct narg)); + n2->type = NARG; + n2->narg.text = argvars; + n2->narg.backquote = NULL; + n2->narg.next = NULL; + n1->nfor.args = n2; + /* + * Newline or semicolon here is optional (but note + * that the original Bourne shell only allowed NL). + */ + if (lasttoken != TNL && lasttoken != TSEMI) + tokpushback++; + } + checkkwd = 2; + if (readtoken() != TDO) + synexpect(TDO); + n1->nfor.body = list(0); + if (readtoken() != TDONE) + synexpect(TDONE); + checkkwd = 1; + break; + case TCASE: + n1 = (union node *)stalloc(sizeof (struct ncase)); + n1->type = NCASE; + if (readtoken() != TWORD) + synexpect(TWORD); + n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); + n2->type = NARG; + n2->narg.text = wordtext; + n2->narg.backquote = backquotelist; + n2->narg.next = NULL; + do { + checkkwd = 1; + } while (readtoken() == TNL); + if (lasttoken != TIN) + synerror("expecting \"in\""); + cpp = &n1->ncase.cases; + checkkwd = 2, readtoken(); + do { + if (lasttoken == TLP) + readtoken(); + *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); + cp->type = NCLIST; + app = &cp->nclist.pattern; + for (;;) { + *app = ap = (union node *)stalloc(sizeof (struct narg)); + ap->type = NARG; + ap->narg.text = wordtext; + ap->narg.backquote = backquotelist; + if (checkkwd = 2, readtoken() != TPIPE) + break; + app = &ap->narg.next; + readtoken(); + } + ap->narg.next = NULL; + if (lasttoken != TRP) + synexpect(TRP); + cp->nclist.body = list(0); + + checkkwd = 2; + if ((t = readtoken()) != TESAC) { + if (t != TENDCASE) + synexpect(TENDCASE); + else + checkkwd = 2, readtoken(); + } + cpp = &cp->nclist.next; + } while(lasttoken != TESAC); + *cpp = NULL; + checkkwd = 1; + break; + case TLP: + n1 = (union node *)stalloc(sizeof (struct nredir)); + n1->type = NSUBSHELL; + n1->nredir.n = list(0); + n1->nredir.redirect = NULL; + if (readtoken() != TRP) + synexpect(TRP); + checkkwd = 1; + break; + case TBEGIN: + n1 = list(0); + if (readtoken() != TEND) + synexpect(TEND); + checkkwd = 1; + break; + /* Handle an empty command like other simple commands. */ + case TSEMI: + case TAND: + case TOR: + case TNL: + case TEOF: + case TRP: + case TBACKGND: + /* + * An empty command before a ; doesn't make much sense, and + * should certainly be disallowed in the case of `if ;'. + */ + if (!redir) + synexpect(-1); + case TWORD: + case TREDIR: + tokpushback++; + n1 = simplecmd(); + return n1; + default: + synexpect(-1); + /* NOTREACHED */ + } + + /* Now check for redirection which may follow command */ + while (readtoken() == TREDIR) { + *rpp = n2 = redirnode; + rpp = &n2->nfile.next; + parsefname(); + } + tokpushback++; + *rpp = NULL; + if (redir) { + if (n1->type != NSUBSHELL) { + n2 = (union node *)stalloc(sizeof (struct nredir)); + n2->type = NREDIR; + n2->nredir.n = n1; + n1 = n2; + } + n1->nredir.redirect = redir; + } + + return n1; +} + + +static union node * +simplecmd() { + union node *args, **app; + union node *n = NULL; + union node *vars, **vpp; + union node **rpp, *redir; + + args = NULL; + app = &args; + vars = NULL; + vpp = &vars; + redir = NULL; + rpp = &redir; + + checkalias = 2; + for (;;) { + switch (readtoken()) { + case TWORD: + case TASSIGN: + n = (union node *)stalloc(sizeof (struct narg)); + n->type = NARG; + n->narg.text = wordtext; + n->narg.backquote = backquotelist; + if (lasttoken == TWORD) { + *app = n; + app = &n->narg.next; + } else { + *vpp = n; + vpp = &n->narg.next; + } + break; + case TREDIR: + *rpp = n = redirnode; + rpp = &n->nfile.next; + parsefname(); /* read name of redirection file */ + break; + case TLP: + if ( + args && app == &args->narg.next && + !vars && !redir + ) { + /* We have a function */ + if (readtoken() != TRP) + synexpect(TRP); + n->type = NDEFUN; + checkkwd = 2; + n->narg.next = command(); + return n; + } + /* fall through */ + default: + tokpushback++; + goto out; + } + } +out: + *app = NULL; + *vpp = NULL; + *rpp = NULL; + n = (union node *)stalloc(sizeof (struct ncmd)); + n->type = NCMD; + n->ncmd.backgnd = 0; + n->ncmd.args = args; + n->ncmd.assign = vars; + n->ncmd.redirect = redir; + return n; +} + +static union node * +makename(void) { + union node *n; + + n = (union node *)stalloc(sizeof (struct narg)); + n->type = NARG; + n->narg.next = NULL; + n->narg.text = wordtext; + n->narg.backquote = backquotelist; + return n; +} + +static void fixredir(union node *n, const char *text, int err) +{ + TRACE(("Fix redir %s %d\n", text, err)); + if (!err) + n->ndup.vname = NULL; + + if (is_digit(text[0]) && text[1] == '\0') + n->ndup.dupfd = digit_val(text[0]); + else if (text[0] == '-' && text[1] == '\0') + n->ndup.dupfd = -1; + else { + + if (err) + synerror("Bad fd number"); + else + n->ndup.vname = makename(); + } +} + + +static void +parsefname(void) { + union node *n = redirnode; + + if (readtoken() != TWORD) + synexpect(-1); + if (n->type == NHERE) { + struct heredoc *here = heredoc; + struct heredoc *p; + int i; + + if (quoteflag == 0) + n->type = NXHERE; + TRACE(("Here document %d\n", n->type)); + if (here->striptabs) { + while (*wordtext == '\t') + wordtext++; + } + if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) + synerror("Illegal eof marker for << redirection"); + rmescapes(wordtext); + here->eofmark = wordtext; + here->next = NULL; + if (heredoclist == NULL) + heredoclist = here; + else { + for (p = heredoclist ; p->next ; p = p->next); + p->next = here; + } + } else if (n->type == NTOFD || n->type == NFROMFD) { + fixredir(n, wordtext, 0); + } else { + n->nfile.fname = makename(); + } +} + + +/* + * Input any here documents. + */ + +static void +parseheredoc() { + struct heredoc *here; + union node *n; + + while (heredoclist) { + here = heredoclist; + heredoclist = here->next; + if (needprompt) { + setprompt(2); + needprompt = 0; + } + readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, + here->eofmark, here->striptabs); + n = (union node *)stalloc(sizeof (struct narg)); + n->narg.type = NARG; + n->narg.next = NULL; + n->narg.text = wordtext; + n->narg.backquote = backquotelist; + here->here->nhere.doc = n; + } +} + +static int +peektoken() { + int t; + + t = readtoken(); + tokpushback++; + return (t); +} + +static int +readtoken() { + int t; + +#ifdef ASH_ALIAS + int savecheckalias = checkalias; + int savecheckkwd = checkkwd; + struct alias *ap; +#endif + +#ifdef DEBUG + int alreadyseen = tokpushback; +#endif + +#ifdef ASH_ALIAS +top: +#endif + + t = xxreadtoken(); + +#ifdef ASH_ALIAS + checkalias = savecheckalias; +#endif + + if (checkkwd) { + /* + * eat newlines + */ + if (checkkwd == 2) { + checkkwd = 0; + while (t == TNL) { + parseheredoc(); + t = xxreadtoken(); + } + } + checkkwd = 0; + /* + * check for keywords + */ + if (t == TWORD && !quoteflag) + { + const char *const *pp; + + if ((pp = findkwd(wordtext))) { + lasttoken = t = pp - parsekwd + KWDOFFSET; + TRACE(("keyword %s recognized\n", tokname[t])); + goto out; + } + } + } + + + if (t != TWORD) { + if (t != TREDIR) { + checkalias = 0; + } + } else if (checkalias == 2 && isassignment(wordtext)) { + lasttoken = t = TASSIGN; +#ifdef ASH_ALIAS + } else if (checkalias) { + if (!quoteflag && (ap = lookupalias(wordtext, 1)) != NULL) { + if (*ap->val) { + pushstring(ap->val, strlen(ap->val), ap); + } + checkkwd = savecheckkwd; + goto top; + } + checkalias = 0; +#endif + } +out: +#ifdef DEBUG + if (!alreadyseen) + TRACE(("token %s %s\n", tokname[t], t == TWORD || t == TASSIGN ? wordtext : "")); + else + TRACE(("reread token %s %s\n", tokname[t], t == TWORD || t == TASSIGN ? wordtext : "")); +#endif + return (t); +} + + +/* + * Read the next input token. + * If the token is a word, we set backquotelist to the list of cmds in + * backquotes. We set quoteflag to true if any part of the word was + * quoted. + * If the token is TREDIR, then we set redirnode to a structure containing + * the redirection. + * In all cases, the variable startlinno is set to the number of the line + * on which the token starts. + * + * [Change comment: here documents and internal procedures] + * [Readtoken shouldn't have any arguments. Perhaps we should make the + * word parsing code into a separate routine. In this case, readtoken + * doesn't need to have any internal procedures, but parseword does. + * We could also make parseoperator in essence the main routine, and + * have parseword (readtoken1?) handle both words and redirection.] + */ + +#define RETURN(token) return lasttoken = token + +static int +xxreadtoken() { + int c; + + if (tokpushback) { + tokpushback = 0; + return lasttoken; + } + if (needprompt) { + setprompt(2); + needprompt = 0; + } + startlinno = plinno; + for (;;) { /* until token or start of word found */ + c = pgetc_macro(); + switch (c) { + case ' ': case '\t': +#ifdef ASH_ALIAS + case PEOA: +#endif + continue; + case '#': + while ((c = pgetc()) != '\n' && c != PEOF); + pungetc(); + continue; + case '\\': + if (pgetc() == '\n') { + startlinno = ++plinno; + if (doprompt) + setprompt(2); + else + setprompt(0); + continue; + } + pungetc(); + goto breakloop; + case '\n': + plinno++; + needprompt = doprompt; + RETURN(TNL); + case PEOF: + RETURN(TEOF); + case '&': + if (pgetc() == '&') + RETURN(TAND); + pungetc(); + RETURN(TBACKGND); + case '|': + if (pgetc() == '|') + RETURN(TOR); + pungetc(); + RETURN(TPIPE); + case ';': + if (pgetc() == ';') + RETURN(TENDCASE); + pungetc(); + RETURN(TSEMI); + case '(': + RETURN(TLP); + case ')': + RETURN(TRP); + default: + goto breakloop; + } + } +breakloop: + return readtoken1(c, BASESYNTAX, (char *)NULL, 0); +#undef RETURN +} + + + +/* + * If eofmark is NULL, read a word or a redirection symbol. If eofmark + * is not NULL, read a here document. In the latter case, eofmark is the + * word which marks the end of the document and striptabs is true if + * leading tabs should be stripped from the document. The argument firstc + * is the first character of the input token or document. + * + * Because C does not have internal subroutines, I have simulated them + * using goto's to implement the subroutine linkage. The following macros + * will run code that appears at the end of readtoken1. + */ + +#define CHECKEND() {goto checkend; checkend_return:;} +#define PARSEREDIR() {goto parseredir; parseredir_return:;} +#define PARSESUB() {goto parsesub; parsesub_return:;} +#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} +#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} +#define PARSEARITH() {goto parsearith; parsearith_return:;} + +static int +readtoken1(firstc, syntax, eofmark, striptabs) + int firstc; + char const *syntax; + char *eofmark; + int striptabs; + { + int c = firstc; + char *out; + int len; + char line[EOFMARKLEN + 1]; + struct nodelist *bqlist; + int quotef; + int dblquote; + int varnest; /* levels of variables expansion */ + int arinest; /* levels of arithmetic expansion */ + int parenlevel; /* levels of parens in arithmetic */ + int dqvarnest; /* levels of variables expansion within double quotes */ + int oldstyle; + char const *prevsyntax; /* syntax before arithmetic */ +#if __GNUC__ + /* Avoid longjmp clobbering */ + (void) &out; + (void) "ef; + (void) &dblquote; + (void) &varnest; + (void) &arinest; + (void) &parenlevel; + (void) &dqvarnest; + (void) &oldstyle; + (void) &prevsyntax; + (void) &syntax; +#endif + + startlinno = plinno; + dblquote = 0; + if (syntax == DQSYNTAX) + dblquote = 1; + quotef = 0; + bqlist = NULL; + varnest = 0; + arinest = 0; + parenlevel = 0; + dqvarnest = 0; + + STARTSTACKSTR(out); + loop: { /* for each line, until end of word */ + CHECKEND(); /* set c to PEOF if at end of here document */ + for (;;) { /* until end of line or end of word */ + CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */ + switch(syntax[c]) { + case CNL: /* '\n' */ + if (syntax == BASESYNTAX) + goto endword; /* exit outer loop */ + USTPUTC(c, out); + plinno++; + if (doprompt) + setprompt(2); + else + setprompt(0); + c = pgetc(); + goto loop; /* continue outer loop */ + case CWORD: + USTPUTC(c, out); + break; + case CCTL: + if ((eofmark == NULL || dblquote) && + dqvarnest == 0) + USTPUTC(CTLESC, out); + USTPUTC(c, out); + break; + case CBACK: /* backslash */ + c = pgetc2(); + if (c == PEOF) { + USTPUTC('\\', out); + pungetc(); + } else if (c == '\n') { + if (doprompt) + setprompt(2); + else + setprompt(0); + } else { + if (dblquote && c != '\\' && c != '`' && c != '$' + && (c != '"' || eofmark != NULL)) + USTPUTC('\\', out); + if (SQSYNTAX[c] == CCTL) + USTPUTC(CTLESC, out); + else if (eofmark == NULL) + USTPUTC(CTLQUOTEMARK, out); + USTPUTC(c, out); + quotef++; + } + break; + case CSQUOTE: + if (eofmark == NULL) + USTPUTC(CTLQUOTEMARK, out); + syntax = SQSYNTAX; + break; + case CDQUOTE: + if (eofmark == NULL) + USTPUTC(CTLQUOTEMARK, out); + syntax = DQSYNTAX; + dblquote = 1; + break; + case CENDQUOTE: + if (eofmark != NULL && arinest == 0 && + varnest == 0) { + USTPUTC(c, out); + } else { + if (arinest) { + syntax = ARISYNTAX; + dblquote = 0; + } else if (eofmark == NULL && + dqvarnest == 0) { + syntax = BASESYNTAX; + dblquote = 0; + } + quotef++; + } + break; + case CVAR: /* '$' */ + PARSESUB(); /* parse substitution */ + break; + case CENDVAR: /* '}' */ + if (varnest > 0) { + varnest--; + if (dqvarnest > 0) { + dqvarnest--; + } + USTPUTC(CTLENDVAR, out); + } else { + USTPUTC(c, out); + } + break; +#ifdef ASH_MATH_SUPPORT + case CLP: /* '(' in arithmetic */ + parenlevel++; + USTPUTC(c, out); + break; + case CRP: /* ')' in arithmetic */ + if (parenlevel > 0) { + USTPUTC(c, out); + --parenlevel; + } else { + if (pgetc() == ')') { + if (--arinest == 0) { + USTPUTC(CTLENDARI, out); + syntax = prevsyntax; + if (syntax == DQSYNTAX) + dblquote = 1; + else + dblquote = 0; + } else + USTPUTC(')', out); + } else { + /* + * unbalanced parens + * (don't 2nd guess - no error) + */ + pungetc(); + USTPUTC(')', out); + } + } + break; +#endif + case CBQUOTE: /* '`' */ + PARSEBACKQOLD(); + break; + case CENDFILE: + goto endword; /* exit outer loop */ + case CIGN: + break; + default: + if (varnest == 0) + goto endword; /* exit outer loop */ +#ifdef ASH_ALIAS + if (c != PEOA) +#endif + USTPUTC(c, out); + + } + c = pgetc_macro(); + } + } +endword: + if (syntax == ARISYNTAX) + synerror("Missing '))'"); + if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL) + synerror("Unterminated quoted string"); + if (varnest != 0) { + startlinno = plinno; + synerror("Missing '}'"); + } + USTPUTC('\0', out); + len = out - stackblock(); + out = stackblock(); + if (eofmark == NULL) { + if ((c == '>' || c == '<') + && quotef == 0 + && len <= 2 + && (*out == '\0' || is_digit(*out))) { + PARSEREDIR(); + return lasttoken = TREDIR; + } else { + pungetc(); + } + } + quoteflag = quotef; + backquotelist = bqlist; + grabstackblock(len); + wordtext = out; + return lasttoken = TWORD; +/* end of readtoken routine */ + + + +/* + * Check to see whether we are at the end of the here document. When this + * is called, c is set to the first character of the next input line. If + * we are at the end of the here document, this routine sets the c to PEOF. + */ + +checkend: { + if (eofmark) { +#ifdef ASH_ALIAS + if (c == PEOA) { + c = pgetc2(); + } +#endif + if (striptabs) { + while (c == '\t') { + c = pgetc2(); + } + } + if (c == *eofmark) { + if (pfgets(line, sizeof line) != NULL) { + char *p, *q; + + p = line; + for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); + if (*p == '\n' && *q == '\0') { + c = PEOF; + plinno++; + needprompt = doprompt; + } else { + pushstring(line, strlen(line), NULL); + } + } + } + } + goto checkend_return; +} + + +/* + * Parse a redirection operator. The variable "out" points to a string + * specifying the fd to be redirected. The variable "c" contains the + * first character of the redirection operator. + */ + +parseredir: { + char fd = *out; + union node *np; + + np = (union node *)stalloc(sizeof (struct nfile)); + if (c == '>') { + np->nfile.fd = 1; + c = pgetc(); + if (c == '>') + np->type = NAPPEND; + else if (c == '&') + np->type = NTOFD; + else if (c == '|') + np->type = NTOOV; + else { + np->type = NTO; + pungetc(); + } + } else { /* c == '<' */ + np->nfile.fd = 0; + switch (c = pgetc()) { + case '<': + if (sizeof (struct nfile) != sizeof (struct nhere)) { + np = (union node *)stalloc(sizeof (struct nhere)); + np->nfile.fd = 0; + } + np->type = NHERE; + heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); + heredoc->here = np; + if ((c = pgetc()) == '-') { + heredoc->striptabs = 1; + } else { + heredoc->striptabs = 0; + pungetc(); + } + break; + + case '&': + np->type = NFROMFD; + break; + + case '>': + np->type = NFROMTO; + break; + + default: + np->type = NFROM; + pungetc(); + break; + } + } + if (fd != '\0') + np->nfile.fd = digit_val(fd); + redirnode = np; + goto parseredir_return; +} + + +/* + * Parse a substitution. At this point, we have read the dollar sign + * and nothing else. + */ + +parsesub: { + int subtype; + int typeloc; + int flags; + char *p; + static const char types[] = "}-+?="; + + c = pgetc(); + if ( + c <= PEOA || + (c != '(' && c != '{' && !is_name(c) && !is_special(c)) + ) { + USTPUTC('$', out); + pungetc(); + } else if (c == '(') { /* $(command) or $((arith)) */ + if (pgetc() == '(') { + PARSEARITH(); + } else { + pungetc(); + PARSEBACKQNEW(); + } + } else { + USTPUTC(CTLVAR, out); + typeloc = out - stackblock(); + USTPUTC(VSNORMAL, out); + subtype = VSNORMAL; + if (c == '{') { + c = pgetc(); + if (c == '#') { + if ((c = pgetc()) == '}') + c = '#'; + else + subtype = VSLENGTH; + } + else + subtype = 0; + } + if (c > PEOA && is_name(c)) { + do { + STPUTC(c, out); + c = pgetc(); + } while (c > PEOA && is_in_name(c)); + } else if (is_digit(c)) { + do { + USTPUTC(c, out); + c = pgetc(); + } while (is_digit(c)); + } + else if (is_special(c)) { + USTPUTC(c, out); + c = pgetc(); + } + else +badsub: synerror("Bad substitution"); + + STPUTC('=', out); + flags = 0; + if (subtype == 0) { + switch (c) { + case ':': + flags = VSNUL; + c = pgetc(); + /*FALLTHROUGH*/ + default: + p = strchr(types, c); + if (p == NULL) + goto badsub; + subtype = p - types + VSNORMAL; + break; + case '%': + case '#': + { + int cc = c; + subtype = c == '#' ? VSTRIMLEFT : + VSTRIMRIGHT; + c = pgetc(); + if (c == cc) + subtype++; + else + pungetc(); + break; + } + } + } else { + pungetc(); + } + if (dblquote || arinest) + flags |= VSQUOTE; + *(stackblock() + typeloc) = subtype | flags; + if (subtype != VSNORMAL) { + varnest++; + if (dblquote) { + dqvarnest++; + } + } + } + goto parsesub_return; +} + + +/* + * Called to parse command substitutions. Newstyle is set if the command + * is enclosed inside $(...); nlpp is a pointer to the head of the linked + * list of commands (passed by reference), and savelen is the number of + * characters on the top of the stack which must be preserved. + */ + +parsebackq: { + struct nodelist **nlpp; + int savepbq; + union node *n; + char *volatile str; + struct jmploc jmploc; + struct jmploc *volatile savehandler; + int savelen; + int saveprompt; +#ifdef __GNUC__ + (void) &saveprompt; +#endif + + savepbq = parsebackquote; + if (setjmp(jmploc.loc)) { + if (str) + ckfree(str); + parsebackquote = 0; + handler = savehandler; + longjmp(handler->loc, 1); + } + INTOFF; + str = NULL; + savelen = out - stackblock(); + if (savelen > 0) { + str = ckmalloc(savelen); + memcpy(str, stackblock(), savelen); + } + savehandler = handler; + handler = &jmploc; + INTON; + if (oldstyle) { + /* We must read until the closing backquote, giving special + treatment to some slashes, and then push the string and + reread it as input, interpreting it normally. */ + char *pout; + int pc; + int psavelen; + char *pstr; + + + STARTSTACKSTR(pout); + for (;;) { + if (needprompt) { + setprompt(2); + needprompt = 0; + } + switch (pc = pgetc()) { + case '`': + goto done; + + case '\\': + if ((pc = pgetc()) == '\n') { + plinno++; + if (doprompt) + setprompt(2); + else + setprompt(0); + /* + * If eating a newline, avoid putting + * the newline into the new character + * stream (via the STPUTC after the + * switch). + */ + continue; + } + if (pc != '\\' && pc != '`' && pc != '$' + && (!dblquote || pc != '"')) + STPUTC('\\', pout); + if (pc > PEOA) { + break; + } + /* fall through */ + + case PEOF: +#ifdef ASH_ALIAS + case PEOA: +#endif + startlinno = plinno; + synerror("EOF in backquote substitution"); + + case '\n': + plinno++; + needprompt = doprompt; + break; + + default: + break; + } + STPUTC(pc, pout); + } +done: + STPUTC('\0', pout); + psavelen = pout - stackblock(); + if (psavelen > 0) { + pstr = grabstackstr(pout); + setinputstring(pstr); + } + } + nlpp = &bqlist; + while (*nlpp) + nlpp = &(*nlpp)->next; + *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); + (*nlpp)->next = NULL; + parsebackquote = oldstyle; + + if (oldstyle) { + saveprompt = doprompt; + doprompt = 0; + } + + n = list(0); + + if (oldstyle) + doprompt = saveprompt; + else { + if (readtoken() != TRP) + synexpect(TRP); + } + + (*nlpp)->n = n; + if (oldstyle) { + /* + * Start reading from old file again, ignoring any pushed back + * tokens left from the backquote parsing + */ + popfile(); + tokpushback = 0; + } + while (stackblocksize() <= savelen) + growstackblock(); + STARTSTACKSTR(out); + if (str) { + memcpy(out, str, savelen); + STADJUST(savelen, out); + INTOFF; + ckfree(str); + str = NULL; + INTON; + } + parsebackquote = savepbq; + handler = savehandler; + if (arinest || dblquote) + USTPUTC(CTLBACKQ | CTLQUOTE, out); + else + USTPUTC(CTLBACKQ, out); + if (oldstyle) + goto parsebackq_oldreturn; + else + goto parsebackq_newreturn; +} + +/* + * Parse an arithmetic expansion (indicate start of one and set state) + */ +parsearith: { + + if (++arinest == 1) { + prevsyntax = syntax; + syntax = ARISYNTAX; + USTPUTC(CTLARI, out); + if (dblquote) + USTPUTC('"',out); + else + USTPUTC(' ',out); + } else { + /* + * we collapse embedded arithmetic expansion to + * parenthesis, which should be equivalent + */ + USTPUTC('(', out); + } + goto parsearith_return; +} + +} /* end of readtoken */ + + +/* + * Returns true if the text contains nothing to expand (no dollar signs + * or backquotes). + */ + +static int +noexpand(text) + char *text; + { + char *p; + char c; + + p = text; + while ((c = *p++) != '\0') { + if (c == CTLQUOTEMARK) + continue; + if (c == CTLESC) + p++; + else if (BASESYNTAX[(int)c] == CCTL) + return 0; + } + return 1; +} + + +/* + * Return true if the argument is a legal variable name (a letter or + * underscore followed by zero or more letters, underscores, and digits). + */ + +static int +goodname(const char *name) +{ + const char *p; + + p = name; + if (! is_name(*p)) + return 0; + while (*++p) { + if (! is_in_name(*p)) + return 0; + } + return 1; +} + + +/* + * Called when an unexpected token is read during the parse. The argument + * is the token that is expected, or -1 if more than one type of token can + * occur at this point. + */ + +static void +synexpect(token) + int token; +{ + char msg[64]; + + if (token >= 0) { + snprintf(msg, 64, "%s unexpected (expecting %s)", + tokname[lasttoken], tokname[token]); + } else { + snprintf(msg, 64, "%s unexpected", tokname[lasttoken]); + } + synerror(msg); + /* NOTREACHED */ +} + + +static void +synerror(const char *msg) +{ + if (commandname) + out2fmt("%s: %d: ", commandname, startlinno); + out2fmt("Syntax error: %s\n", msg); + error((char *)NULL); + /* NOTREACHED */ +} + + +/* + * called by editline -- any expansions to the prompt + * should be added here. + */ +static void +setprompt(int whichprompt) +{ + char *prompt; + switch (whichprompt) { + case 1: + prompt = ps1val(); + break; + case 2: + prompt = ps2val(); + break; + default: /* 0 */ + prompt = ""; + } + putprompt(prompt); +} + + +/* + * Code for dealing with input/output redirection. + */ + +#define EMPTY -2 /* marks an unused slot in redirtab */ +#ifndef PIPE_BUF +# define PIPESIZE 4096 /* amount of buffering in a pipe */ +#else +# define PIPESIZE PIPE_BUF +#endif + + +/* + * Open a file in noclobber mode. + * The code was copied from bash. + */ +static inline int +noclobberopen(const char *fname) +{ + int r, fd; + struct stat finfo, finfo2; + + /* + * If the file exists and is a regular file, return an error + * immediately. + */ + r = stat(fname, &finfo); + if (r == 0 && S_ISREG(finfo.st_mode)) { + errno = EEXIST; + return -1; + } + + /* + * If the file was not present (r != 0), make sure we open it + * exclusively so that if it is created before we open it, our open + * will fail. Make sure that we do not truncate an existing file. + * Note that we don't turn on O_EXCL unless the stat failed -- if the + * file was not a regular file, we leave O_EXCL off. + */ + if (r != 0) + return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666); + fd = open(fname, O_WRONLY|O_CREAT, 0666); + + /* If the open failed, return the file descriptor right away. */ + if (fd < 0) + return fd; + + /* + * OK, the open succeeded, but the file may have been changed from a + * non-regular file to a regular file between the stat and the open. + * We are assuming that the O_EXCL open handles the case where FILENAME + * did not exist and is symlinked to an existing file between the stat + * and open. + */ + + /* + * If we can open it and fstat the file descriptor, and neither check + * revealed that it was a regular file, and the file has not been + * replaced, return the file descriptor. + */ + if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) && + finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino) + return fd; + + /* The file has been replaced. badness. */ + close(fd); + errno = EEXIST; + return -1; +} + +/* + * Handle here documents. Normally we fork off a process to write the + * data to a pipe. If the document is short, we can stuff the data in + * the pipe without forking. + */ + +static inline int +openhere(const union node *redir) +{ + int pip[2]; + int len = 0; + + if (pipe(pip) < 0) + error("Pipe call failed"); + if (redir->type == NHERE) { + len = strlen(redir->nhere.doc->narg.text); + if (len <= PIPESIZE) { + xwrite(pip[1], redir->nhere.doc->narg.text, len); + goto out; + } + } + if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) { + close(pip[0]); + signal(SIGINT, SIG_IGN); + signal(SIGQUIT, SIG_IGN); + signal(SIGHUP, SIG_IGN); +#ifdef SIGTSTP + signal(SIGTSTP, SIG_IGN); +#endif + signal(SIGPIPE, SIG_DFL); + if (redir->type == NHERE) + xwrite(pip[1], redir->nhere.doc->narg.text, len); + else + expandhere(redir->nhere.doc, pip[1]); + _exit(0); + } +out: + close(pip[1]); + return pip[0]; +} + + +static inline int +openredirect(const union node *redir) +{ + char *fname; + int f; + + switch (redir->nfile.type) { + case NFROM: + fname = redir->nfile.expfname; + if ((f = open(fname, O_RDONLY)) < 0) + goto eopen; + break; + case NFROMTO: + fname = redir->nfile.expfname; + if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0) + goto ecreate; + break; + case NTO: + /* Take care of noclobber mode. */ + if (Cflag) { + fname = redir->nfile.expfname; + if ((f = noclobberopen(fname)) < 0) + goto ecreate; + break; + } + case NTOOV: + fname = redir->nfile.expfname; +#ifdef O_CREAT + if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0) + goto ecreate; +#else + if ((f = creat(fname, 0666)) < 0) + goto ecreate; +#endif + break; + case NAPPEND: + fname = redir->nfile.expfname; +#ifdef O_APPEND + if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0) + goto ecreate; +#else + if ((f = open(fname, O_WRONLY)) < 0 + && (f = creat(fname, 0666)) < 0) + goto ecreate; + lseek(f, (off_t)0, 2); +#endif + break; + default: +#ifdef DEBUG + abort(); +#endif + /* Fall through to eliminate warning. */ + case NTOFD: + case NFROMFD: + f = -1; + break; + case NHERE: + case NXHERE: + f = openhere(redir); + break; + } + + return f; +ecreate: + error("cannot create %s: %s", fname, errmsg(errno, E_CREAT)); +eopen: + error("cannot open %s: %s", fname, errmsg(errno, E_OPEN)); +} + + +/* + * Process a list of redirection commands. If the REDIR_PUSH flag is set, + * old file descriptors are stashed away so that the redirection can be + * undone by calling popredir. If the REDIR_BACKQ flag is set, then the + * standard output, and the standard error if it becomes a duplicate of + * stdout. + */ + +static void +redirect(union node *redir, int flags) +{ + union node *n; + struct redirtab *sv = NULL; + int i; + int fd; + int newfd; + int try; + int fd1dup = flags & REDIR_BACKQ;; /* stdout `cmd` redir to pipe */ + + if (flags & REDIR_PUSH) { + sv = ckmalloc(sizeof (struct redirtab)); + for (i = 0 ; i < 10 ; i++) + sv->renamed[i] = EMPTY; + sv->next = redirlist; + redirlist = sv; + } + for (n = redir ; n ; n = n->nfile.next) { + fd = n->nfile.fd; + try = 0; + if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) && + n->ndup.dupfd == fd) + continue; /* redirect from/to same file descriptor */ + + INTOFF; + newfd = openredirect(n); + if ((flags & REDIR_PUSH) && sv->renamed[fd] == EMPTY) { + if (newfd == fd) { + try++; + } else if ((i = fcntl(fd, F_DUPFD, 10)) == -1) { + switch (errno) { + case EBADF: + if (!try) { + dupredirect(n, newfd, fd1dup); + try++; + break; + } + /* FALLTHROUGH*/ + default: + if (newfd >= 0) { + close(newfd); + } + INTON; + error("%d: %m", fd); + /* NOTREACHED */ + } + } + if (!try) { + close(fd); + if (flags & REDIR_PUSH) { + sv->renamed[fd] = i; + } + } + } else if (fd != newfd) { + close(fd); + } + if (fd == 0) + fd0_redirected++; + if (!try) + dupredirect(n, newfd, fd1dup); + INTON; + } +} + + +static void +dupredirect(const union node *redir, int f, int fd1dup) +{ + int fd = redir->nfile.fd; + + if(fd==1) + fd1dup = 0; + if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) { + if (redir->ndup.dupfd >= 0) { /* if not ">&-" */ + if (redir->ndup.dupfd!=1 || fd1dup!=1) + dup_as_newfd(redir->ndup.dupfd, fd); + } + return; + } + + if (f != fd) { + dup_as_newfd(f, fd); + close(f); + } + return; +} + + + +/* + * Undo the effects of the last redirection. + */ + +static void +popredir(void) +{ + struct redirtab *rp = redirlist; + int i; + + INTOFF; + for (i = 0 ; i < 10 ; i++) { + if (rp->renamed[i] != EMPTY) { + if (i == 0) + fd0_redirected--; + close(i); + if (rp->renamed[i] >= 0) { + dup_as_newfd(rp->renamed[i], i); + close(rp->renamed[i]); + } + } + } + redirlist = rp->next; + ckfree(rp); + INTON; +} + +/* + * Discard all saved file descriptors. + */ + +static void +clearredir(void) { + struct redirtab *rp; + int i; + + for (rp = redirlist ; rp ; rp = rp->next) { + for (i = 0 ; i < 10 ; i++) { + if (rp->renamed[i] >= 0) { + close(rp->renamed[i]); + } + rp->renamed[i] = EMPTY; + } + } +} + + +/* + * Copy a file descriptor to be >= to. Returns -1 + * if the source file descriptor is closed, EMPTY if there are no unused + * file descriptors left. + */ + +static int +dup_as_newfd(from, to) + int from; + int to; +{ + int newfd; + + newfd = fcntl(from, F_DUPFD, to); + if (newfd < 0) { + if (errno == EMFILE) + return EMPTY; + else + error("%d: %m", from); + } + return newfd; +} + +/*#ifdef __weak_alias +__weak_alias(getmode,_getmode) +__weak_alias(setmode,_setmode) +#endif*/ + +#ifndef S_ISTXT +#if defined(__GLIBC__) && __GLIBC__ >= 2 +#define S_ISTXT __S_ISVTX +#else +#define S_ISTXT S_ISVTX +#endif +#endif + +#define SET_LEN 6 /* initial # of bitcmd struct to malloc */ +#define SET_LEN_INCR 4 /* # of bitcmd structs to add as needed */ + +typedef struct bitcmd { + char cmd; + char cmd2; + mode_t bits; +} BITCMD; + +#define CMD2_CLR 0x01 +#define CMD2_SET 0x02 +#define CMD2_GBITS 0x04 +#define CMD2_OBITS 0x08 +#define CMD2_UBITS 0x10 + +static BITCMD *addcmd (BITCMD *, int, int, int, u_int); +static void compress_mode (BITCMD *); +#ifdef SETMODE_DEBUG +static void dumpmode (BITCMD *); +#endif + +/* + * Given the old mode and an array of bitcmd structures, apply the operations + * described in the bitcmd structures to the old mode, and return the new mode. + * Note that there is no '=' command; a strict assignment is just a '-' (clear + * bits) followed by a '+' (set bits). + */ +static mode_t +getmode(bbox, omode) + const void *bbox; + mode_t omode; +{ + const BITCMD *set; + mode_t clrval, newmode, value; + + _DIAGASSERT(bbox != NULL); + + set = (const BITCMD *)bbox; + newmode = omode; + for (value = 0;; set++) + switch(set->cmd) { + /* + * When copying the user, group or other bits around, we "know" + * where the bits are in the mode so that we can do shifts to + * copy them around. If we don't use shifts, it gets real + * grundgy with lots of single bit checks and bit sets. + */ + case 'u': + value = (newmode & S_IRWXU) >> 6; + goto common; + + case 'g': + value = (newmode & S_IRWXG) >> 3; + goto common; + + case 'o': + value = newmode & S_IRWXO; +common: if (set->cmd2 & CMD2_CLR) { + clrval = + (set->cmd2 & CMD2_SET) ? S_IRWXO : value; + if (set->cmd2 & CMD2_UBITS) + newmode &= ~((clrval<<6) & set->bits); + if (set->cmd2 & CMD2_GBITS) + newmode &= ~((clrval<<3) & set->bits); + if (set->cmd2 & CMD2_OBITS) + newmode &= ~(clrval & set->bits); + } + if (set->cmd2 & CMD2_SET) { + if (set->cmd2 & CMD2_UBITS) + newmode |= (value<<6) & set->bits; + if (set->cmd2 & CMD2_GBITS) + newmode |= (value<<3) & set->bits; + if (set->cmd2 & CMD2_OBITS) + newmode |= value & set->bits; + } + break; + + case '+': + newmode |= set->bits; + break; + + case '-': + newmode &= ~set->bits; + break; + + case 'X': + if (omode & (S_IFDIR|S_IXUSR|S_IXGRP|S_IXOTH)) + newmode |= set->bits; + break; + + case '\0': + default: +#ifdef SETMODE_DEBUG + (void)printf("getmode:%04o -> %04o\n", omode, newmode); +#endif + return (newmode); + } +} + +#define ADDCMD(a, b, c, d) do { \ + if (set >= endset) { \ + BITCMD *newset; \ + setlen += SET_LEN_INCR; \ + newset = realloc(saveset, sizeof(BITCMD) * setlen); \ + if (newset == NULL) { \ + free(saveset); \ + return (NULL); \ + } \ + set = newset + (set - saveset); \ + saveset = newset; \ + endset = newset + (setlen - 2); \ + } \ + set = addcmd(set, (a), (b), (c), (d)); \ +} while (/*CONSTCOND*/0) + +#define STANDARD_BITS (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO) + +static void * +setmode(p) + const char *p; +{ + int perm, who; + char op, *ep; + BITCMD *set, *saveset, *endset; + sigset_t mysigset, sigoset; + mode_t mask; + int equalopdone = 0; /* pacify gcc */ + int permXbits, setlen; + + if (!*p) + return (NULL); + + /* + * Get a copy of the mask for the permissions that are mask relative. + * Flip the bits, we want what's not set. Since it's possible that + * the caller is opening files inside a signal handler, protect them + * as best we can. + */ + sigfillset(&mysigset); + (void)sigprocmask(SIG_BLOCK, &mysigset, &sigoset); + (void)umask(mask = umask(0)); + mask = ~mask; + (void)sigprocmask(SIG_SETMASK, &sigoset, NULL); + + setlen = SET_LEN + 2; + + if ((set = malloc((u_int)(sizeof(BITCMD) * setlen))) == NULL) + return (NULL); + saveset = set; + endset = set + (setlen - 2); + + /* + * If an absolute number, get it and return; disallow non-octal digits + * or illegal bits. + */ + if (is_digit((unsigned char)*p)) { + perm = (mode_t)strtol(p, &ep, 8); + if (*ep || perm & ~(STANDARD_BITS|S_ISTXT)) { + free(saveset); + return (NULL); + } + ADDCMD('=', (STANDARD_BITS|S_ISTXT), perm, mask); + set->cmd = 0; + return (saveset); + } + + /* + * Build list of structures to set/clear/copy bits as described by + * each clause of the symbolic mode. + */ + for (;;) { + /* First, find out which bits might be modified. */ + for (who = 0;; ++p) { + switch (*p) { + case 'a': + who |= STANDARD_BITS; + break; + case 'u': + who |= S_ISUID|S_IRWXU; + break; + case 'g': + who |= S_ISGID|S_IRWXG; + break; + case 'o': + who |= S_IRWXO; + break; + default: + goto getop; + } + } + +getop: if ((op = *p++) != '+' && op != '-' && op != '=') { + free(saveset); + return (NULL); + } + if (op == '=') + equalopdone = 0; + + who &= ~S_ISTXT; + for (perm = 0, permXbits = 0;; ++p) { + switch (*p) { + case 'r': + perm |= S_IRUSR|S_IRGRP|S_IROTH; + break; + case 's': + /* + * If specific bits where requested and + * only "other" bits ignore set-id. + */ + if (who == 0 || (who & ~S_IRWXO)) + perm |= S_ISUID|S_ISGID; + break; + case 't': + /* + * If specific bits where requested and + * only "other" bits ignore set-id. + */ + if (who == 0 || (who & ~S_IRWXO)) { + who |= S_ISTXT; + perm |= S_ISTXT; + } + break; + case 'w': + perm |= S_IWUSR|S_IWGRP|S_IWOTH; + break; + case 'X': + permXbits = S_IXUSR|S_IXGRP|S_IXOTH; + break; + case 'x': + perm |= S_IXUSR|S_IXGRP|S_IXOTH; + break; + case 'u': + case 'g': + case 'o': + /* + * When ever we hit 'u', 'g', or 'o', we have + * to flush out any partial mode that we have, + * and then do the copying of the mode bits. + */ + if (perm) { + ADDCMD(op, who, perm, mask); + perm = 0; + } + if (op == '=') + equalopdone = 1; + if (op == '+' && permXbits) { + ADDCMD('X', who, permXbits, mask); + permXbits = 0; + } + ADDCMD(*p, who, op, mask); + break; + + default: + /* + * Add any permissions that we haven't already + * done. + */ + if (perm || (op == '=' && !equalopdone)) { + if (op == '=') + equalopdone = 1; + ADDCMD(op, who, perm, mask); + perm = 0; + } + if (permXbits) { + ADDCMD('X', who, permXbits, mask); + permXbits = 0; + } + goto apply; + } + } + +apply: if (!*p) + break; + if (*p != ',') + goto getop; + ++p; + } + set->cmd = 0; +#ifdef SETMODE_DEBUG + (void)printf("Before compress_mode()\n"); + dumpmode(saveset); +#endif + compress_mode(saveset); +#ifdef SETMODE_DEBUG + (void)printf("After compress_mode()\n"); + dumpmode(saveset); +#endif + return (saveset); +} + +static BITCMD * +addcmd(set, op, who, oparg, mask) + BITCMD *set; + int oparg, who; + int op; + u_int mask; +{ + + _DIAGASSERT(set != NULL); + + switch (op) { + case '=': + set->cmd = '-'; + set->bits = who ? who : STANDARD_BITS; + set++; + + op = '+'; + /* FALLTHROUGH */ + case '+': + case '-': + case 'X': + set->cmd = op; + set->bits = (who ? who : mask) & oparg; + break; + + case 'u': + case 'g': + case 'o': + set->cmd = op; + if (who) { + set->cmd2 = ((who & S_IRUSR) ? CMD2_UBITS : 0) | + ((who & S_IRGRP) ? CMD2_GBITS : 0) | + ((who & S_IROTH) ? CMD2_OBITS : 0); + set->bits = (mode_t)~0; + } else { + set->cmd2 = CMD2_UBITS | CMD2_GBITS | CMD2_OBITS; + set->bits = mask; + } + + if (oparg == '+') + set->cmd2 |= CMD2_SET; + else if (oparg == '-') + set->cmd2 |= CMD2_CLR; + else if (oparg == '=') + set->cmd2 |= CMD2_SET|CMD2_CLR; + break; + } + return (set + 1); +} + +#ifdef SETMODE_DEBUG +static void +dumpmode(set) + BITCMD *set; +{ + + _DIAGASSERT(set != NULL); + + for (; set->cmd; ++set) + (void)printf("cmd: '%c' bits %04o%s%s%s%s%s%s\n", + set->cmd, set->bits, set->cmd2 ? " cmd2:" : "", + set->cmd2 & CMD2_CLR ? " CLR" : "", + set->cmd2 & CMD2_SET ? " SET" : "", + set->cmd2 & CMD2_UBITS ? " UBITS" : "", + set->cmd2 & CMD2_GBITS ? " GBITS" : "", + set->cmd2 & CMD2_OBITS ? " OBITS" : ""); +} +#endif + +/* + * Given an array of bitcmd structures, compress by compacting consecutive + * '+', '-' and 'X' commands into at most 3 commands, one of each. The 'u', + * 'g' and 'o' commands continue to be separate. They could probably be + * compacted, but it's not worth the effort. + */ +static void +compress_mode(set) + BITCMD *set; +{ + BITCMD *nset; + int setbits, clrbits, Xbits, op; + + _DIAGASSERT(set != NULL); + + for (nset = set;;) { + /* Copy over any 'u', 'g' and 'o' commands. */ + while ((op = nset->cmd) != '+' && op != '-' && op != 'X') { + *set++ = *nset++; + if (!op) + return; + } + + for (setbits = clrbits = Xbits = 0;; nset++) { + if ((op = nset->cmd) == '-') { + clrbits |= nset->bits; + setbits &= ~nset->bits; + Xbits &= ~nset->bits; + } else if (op == '+') { + setbits |= nset->bits; + clrbits &= ~nset->bits; + Xbits &= ~nset->bits; + } else if (op == 'X') + Xbits |= nset->bits & ~setbits; + else + break; + } + if (clrbits) { + set->cmd = '-'; + set->cmd2 = 0; + set->bits = clrbits; + set++; + } + if (setbits) { + set->cmd = '+'; + set->cmd2 = 0; + set->bits = setbits; + set++; + } + if (Xbits) { + set->cmd = 'X'; + set->cmd2 = 0; + set->bits = Xbits; + set++; + } + } +} +#ifdef DEBUG +static void shtree (union node *, int, char *, FILE*); +static void shcmd (union node *, FILE *); +static void sharg (union node *, FILE *); +static void indent (int, char *, FILE *); +static void trstring (char *); + + +static void +showtree(n) + union node *n; +{ + trputs("showtree called\n"); + shtree(n, 1, NULL, stdout); +} + + +static void +shtree(n, ind, pfx, fp) + union node *n; + int ind; + char *pfx; + FILE *fp; +{ + struct nodelist *lp; + const char *s; + + if (n == NULL) + return; + + indent(ind, pfx, fp); + switch(n->type) { + case NSEMI: + s = "; "; + goto binop; + case NAND: + s = " && "; + goto binop; + case NOR: + s = " || "; +binop: + shtree(n->nbinary.ch1, ind, NULL, fp); + /* if (ind < 0) */ + fputs(s, fp); + shtree(n->nbinary.ch2, ind, NULL, fp); + break; + case NCMD: + shcmd(n, fp); + if (ind >= 0) + putc('\n', fp); + break; + case NPIPE: + for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { + shcmd(lp->n, fp); + if (lp->next) + fputs(" | ", fp); + } + if (n->npipe.backgnd) + fputs(" &", fp); + if (ind >= 0) + putc('\n', fp); + break; + default: + fprintf(fp, "<node type %d>", n->type); + if (ind >= 0) + putc('\n', fp); + break; + } +} + + + +static void +shcmd(cmd, fp) + union node *cmd; + FILE *fp; +{ + union node *np; + int first; + const char *s; + int dftfd; + + first = 1; + for (np = cmd->ncmd.args ; np ; np = np->narg.next) { + if (! first) + putchar(' '); + sharg(np, fp); + first = 0; + } + for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) { + if (! first) + putchar(' '); + switch (np->nfile.type) { + case NTO: s = ">"; dftfd = 1; break; + case NAPPEND: s = ">>"; dftfd = 1; break; + case NTOFD: s = ">&"; dftfd = 1; break; + case NTOOV: s = ">|"; dftfd = 1; break; + case NFROM: s = "<"; dftfd = 0; break; + case NFROMFD: s = "<&"; dftfd = 0; break; + case NFROMTO: s = "<>"; dftfd = 0; break; + default: s = "*error*"; dftfd = 0; break; + } + if (np->nfile.fd != dftfd) + fprintf(fp, "%d", np->nfile.fd); + fputs(s, fp); + if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) { + fprintf(fp, "%d", np->ndup.dupfd); + } else { + sharg(np->nfile.fname, fp); + } + first = 0; + } +} + + + +static void +sharg(arg, fp) + union node *arg; + FILE *fp; + { + char *p; + struct nodelist *bqlist; + int subtype; + + if (arg->type != NARG) { + printf("<node type %d>\n", arg->type); + fflush(stdout); + abort(); + } + bqlist = arg->narg.backquote; + for (p = arg->narg.text ; *p ; p++) { + switch (*p) { + case CTLESC: + putc(*++p, fp); + break; + case CTLVAR: + putc('$', fp); + putc('{', fp); + subtype = *++p; + if (subtype == VSLENGTH) + putc('#', fp); + + while (*p != '=') + putc(*p++, fp); + + if (subtype & VSNUL) + putc(':', fp); + + switch (subtype & VSTYPE) { + case VSNORMAL: + putc('}', fp); + break; + case VSMINUS: + putc('-', fp); + break; + case VSPLUS: + putc('+', fp); + break; + case VSQUESTION: + putc('?', fp); + break; + case VSASSIGN: + putc('=', fp); + break; + case VSTRIMLEFT: + putc('#', fp); + break; + case VSTRIMLEFTMAX: + putc('#', fp); + putc('#', fp); + break; + case VSTRIMRIGHT: + putc('%', fp); + break; + case VSTRIMRIGHTMAX: + putc('%', fp); + putc('%', fp); + break; + case VSLENGTH: + break; + default: + printf("<subtype %d>", subtype); + } + break; + case CTLENDVAR: + putc('}', fp); + break; + case CTLBACKQ: + case CTLBACKQ|CTLQUOTE: + putc('$', fp); + putc('(', fp); + shtree(bqlist->n, -1, NULL, fp); + putc(')', fp); + break; + default: + putc(*p, fp); + break; + } + } +} + + +static void +indent(amount, pfx, fp) + int amount; + char *pfx; + FILE *fp; +{ + int i; + + for (i = 0 ; i < amount ; i++) { + if (pfx && i == amount - 1) + fputs(pfx, fp); + putc('\t', fp); + } +} +#endif + + + +/* + * Debugging stuff. + */ + + +#ifdef DEBUG +FILE *tracefile; + +#if DEBUG == 2 +static int debug = 1; +#else +static int debug = 0; +#endif + + +static void +trputc(c) + int c; +{ + if (tracefile == NULL) + return; + putc(c, tracefile); + if (c == '\n') + fflush(tracefile); +} + +static void +trace(const char *fmt, ...) +{ + va_list va; + va_start(va, fmt); + if (tracefile != NULL) { + (void) vfprintf(tracefile, fmt, va); + if (strchr(fmt, '\n')) + (void) fflush(tracefile); + } + va_end(va); +} + + +static void +trputs(s) + const char *s; +{ + if (tracefile == NULL) + return; + fputs(s, tracefile); + if (strchr(s, '\n')) + fflush(tracefile); +} + + +static void +trstring(s) + char *s; +{ + char *p; + char c; + + if (tracefile == NULL) + return; + putc('"', tracefile); + for (p = s ; *p ; p++) { + switch (*p) { + case '\n': c = 'n'; goto backslash; + case '\t': c = 't'; goto backslash; + case '\r': c = 'r'; goto backslash; + case '"': c = '"'; goto backslash; + case '\\': c = '\\'; goto backslash; + case CTLESC: c = 'e'; goto backslash; + case CTLVAR: c = 'v'; goto backslash; + case CTLVAR+CTLQUOTE: c = 'V'; goto backslash; + case CTLBACKQ: c = 'q'; goto backslash; + case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash; +backslash: putc('\\', tracefile); + putc(c, tracefile); + break; + default: + if (*p >= ' ' && *p <= '~') + putc(*p, tracefile); + else { + putc('\\', tracefile); + putc(*p >> 6 & 03, tracefile); + putc(*p >> 3 & 07, tracefile); + putc(*p & 07, tracefile); + } + break; + } + } + putc('"', tracefile); +} + + +static void +trargs(ap) + char **ap; +{ + if (tracefile == NULL) + return; + while (*ap) { + trstring(*ap++); + if (*ap) + putc(' ', tracefile); + else + putc('\n', tracefile); + } + fflush(tracefile); +} + + +static void +opentrace() { + char s[100]; +#ifdef O_APPEND + int flags; +#endif + + if (!debug) + return; +#ifdef not_this_way + { + char *p; + if ((p = getenv("HOME")) == NULL) { + if (geteuid() == 0) + p = "/"; + else + p = "/tmp"; + } + strcpy(s, p); + strcat(s, "/trace"); + } +#else + strcpy(s, "./trace"); +#endif /* not_this_way */ + if ((tracefile = fopen(s, "a")) == NULL) { + fprintf(stderr, "Can't open %s\n", s); + return; + } +#ifdef O_APPEND + if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0) + fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); +#endif + fputs("\nTracing started.\n", tracefile); + fflush(tracefile); +} +#endif /* DEBUG */ + + +/* + * The trap builtin. + */ + +static int +trapcmd(argc, argv) + int argc; + char **argv; +{ + char *action; + char **ap; + int signo; + + if (argc <= 1) { + for (signo = 0 ; signo < NSIG ; signo++) { + if (trap[signo] != NULL) { + char *p; + const char *sn; + + p = single_quote(trap[signo]); + sn = sys_siglist[signo]; + if(sn==NULL) + sn = u_signal_names(0, &signo, 0); + if(sn==NULL) + sn = "???"; + printf("trap -- %s %s\n", p, sn); + stunalloc(p); + } + } + return 0; + } + ap = argv + 1; + if (argc == 2) + action = NULL; + else + action = *ap++; + while (*ap) { + if ((signo = decode_signal(*ap, 0)) < 0) + error("%s: bad trap", *ap); + INTOFF; + if (action) { + if (action[0] == '-' && action[1] == '\0') + action = NULL; + else + action = savestr(action); + } + if (trap[signo]) + ckfree(trap[signo]); + trap[signo] = action; + if (signo != 0) + setsignal(signo); + INTON; + ap++; + } + return 0; +} + + + + + + +/* + * Set the signal handler for the specified signal. The routine figures + * out what it should be set to. + */ + +static void +setsignal(int signo) +{ + int action; + char *t; + struct sigaction act; + + if ((t = trap[signo]) == NULL) + action = S_DFL; + else if (*t != '\0') + action = S_CATCH; + else + action = S_IGN; + if (rootshell && action == S_DFL) { + switch (signo) { + case SIGINT: + if (iflag || minusc || sflag == 0) + action = S_CATCH; + break; + case SIGQUIT: +#ifdef DEBUG + { + + if (debug) + break; + } +#endif + /* FALLTHROUGH */ + case SIGTERM: + if (iflag) + action = S_IGN; + break; +#ifdef JOBS + case SIGTSTP: + case SIGTTOU: + if (mflag) + action = S_IGN; + break; +#endif + } + } + + t = &sigmode[signo - 1]; + if (*t == 0) { + /* + * current setting unknown + */ + if (sigaction(signo, 0, &act) == -1) { + /* + * Pretend it worked; maybe we should give a warning + * here, but other shells don't. We don't alter + * sigmode, so that we retry every time. + */ + return; + } + if (act.sa_handler == SIG_IGN) { + if (mflag && (signo == SIGTSTP || + signo == SIGTTIN || signo == SIGTTOU)) { + *t = S_IGN; /* don't hard ignore these */ + } else + *t = S_HARD_IGN; + } else { + *t = S_RESET; /* force to be set */ + } + } + if (*t == S_HARD_IGN || *t == action) + return; + switch (action) { + case S_CATCH: + act.sa_handler = onsig; + break; + case S_IGN: + act.sa_handler = SIG_IGN; + break; + default: + act.sa_handler = SIG_DFL; + } + *t = action; + act.sa_flags = 0; + sigemptyset(&act.sa_mask); + sigaction(signo, &act, 0); +} + +/* + * Ignore a signal. + */ + +static void +ignoresig(signo) + int signo; +{ + if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) { + signal(signo, SIG_IGN); + } + sigmode[signo - 1] = S_HARD_IGN; +} + + +/* + * Signal handler. + */ + +static void +onsig(int signo) +{ + if (signo == SIGINT && trap[SIGINT] == NULL) { + onint(); + return; + } + gotsig[signo - 1] = 1; + pendingsigs++; +} + + +/* + * Called to execute a trap. Perhaps we should avoid entering new trap + * handlers while we are executing a trap handler. + */ + +static void +dotrap(void) +{ + int i; + int savestatus; + + for (;;) { + for (i = 1 ; ; i++) { + if (gotsig[i - 1]) + break; + if (i >= NSIG - 1) + goto done; + } + gotsig[i - 1] = 0; + savestatus=exitstatus; + evalstring(trap[i], 0); + exitstatus=savestatus; + } +done: + pendingsigs = 0; +} + +/* + * Called to exit the shell. + */ + +static void +exitshell(int status) +{ + struct jmploc loc1, loc2; + char *p; + + TRACE(("exitshell(%d) pid=%d\n", status, getpid())); + if (setjmp(loc1.loc)) { + goto l1; + } + if (setjmp(loc2.loc)) { + goto l2; + } + handler = &loc1; + if ((p = trap[0]) != NULL && *p != '\0') { + trap[0] = NULL; + evalstring(p, 0); + } +l1: handler = &loc2; /* probably unnecessary */ + flushall(); +#ifdef JOBS + setjobctl(0); +#endif +l2: _exit(status); + /* NOTREACHED */ +} + +static int decode_signal(const char *string, int minsig) +{ + int signo; + const char *name = u_signal_names(string, &signo, minsig); + + return name ? signo : -1; +} + +static struct var **hashvar (const char *); +static void showvars (const char *, int, int); +static struct var **findvar (struct var **, const char *); + +/* + * Initialize the varable symbol tables and import the environment + */ + +/* + * This routine initializes the builtin variables. It is called when the + * shell is initialized and again when a shell procedure is spawned. + */ + +static void +initvar() { + const struct varinit *ip; + struct var *vp; + struct var **vpp; + + for (ip = varinit ; (vp = ip->var) != NULL ; ip++) { + if ((vp->flags & VEXPORT) == 0) { + vpp = hashvar(ip->text); + vp->next = *vpp; + *vpp = vp; + vp->text = strdup(ip->text); + vp->flags = ip->flags; + vp->func = ip->func; + } + } + /* + * PS1 depends on uid + */ + if ((vps1.flags & VEXPORT) == 0) { + vpp = hashvar("PS1="); + vps1.next = *vpp; + *vpp = &vps1; + vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# "); + vps1.flags = VSTRFIXED|VTEXTFIXED; + } +} + +/* + * Set the value of a variable. The flags argument is ored with the + * flags of the variable. If val is NULL, the variable is unset. + */ + +static void +setvar(name, val, flags) + const char *name, *val; + int flags; +{ + const char *p; + int len; + int namelen; + char *nameeq; + int isbad; + int vallen = 0; + + isbad = 0; + p = name; + if (! is_name(*p)) + isbad = 1; + p++; + for (;;) { + if (! is_in_name(*p)) { + if (*p == '\0' || *p == '=') + break; + isbad = 1; + } + p++; + } + namelen = p - name; + if (isbad) + error("%.*s: bad variable name", namelen, name); + len = namelen + 2; /* 2 is space for '=' and '\0' */ + if (val == NULL) { + flags |= VUNSET; + } else { + len += vallen = strlen(val); + } + INTOFF; + nameeq = ckmalloc(len); + memcpy(nameeq, name, namelen); + nameeq[namelen] = '='; + if (val) { + memcpy(nameeq + namelen + 1, val, vallen + 1); + } else { + nameeq[namelen + 1] = '\0'; + } + setvareq(nameeq, flags); + INTON; +} + + + +/* + * Same as setvar except that the variable and value are passed in + * the first argument as name=value. Since the first argument will + * be actually stored in the table, it should not be a string that + * will go away. + */ + +static void +setvareq(s, flags) + char *s; + int flags; +{ + struct var *vp, **vpp; + + vpp = hashvar(s); + flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1)); + if ((vp = *findvar(vpp, s))) { + if (vp->flags & VREADONLY) { + size_t len = strchr(s, '=') - s; + error("%.*s: is read only", len, s); + } + INTOFF; + + if (vp->func && (flags & VNOFUNC) == 0) + (*vp->func)(strchr(s, '=') + 1); + + if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) + ckfree(vp->text); + + vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET); + vp->flags |= flags; + vp->text = s; + + /* + * We could roll this to a function, to handle it as + * a regular variable function callback, but why bother? + */ + if (iflag && (vp == &vmpath || (vp == &vmail && !mpathset()))) + chkmail(1); + INTON; + return; + } + /* not found */ + vp = ckmalloc(sizeof (*vp)); + vp->flags = flags; + vp->text = s; + vp->next = *vpp; + vp->func = NULL; + *vpp = vp; +} + + + +/* + * Process a linked list of variable assignments. + */ + +static void +listsetvar(mylist) + struct strlist *mylist; + { + struct strlist *lp; + + INTOFF; + for (lp = mylist ; lp ; lp = lp->next) { + setvareq(savestr(lp->text), 0); + } + INTON; +} + + + +/* + * Find the value of a variable. Returns NULL if not set. + */ + +static const char * +lookupvar(name) + const char *name; + { + struct var *v; + + if ((v = *findvar(hashvar(name), name)) && !(v->flags & VUNSET)) { + return strchr(v->text, '=') + 1; + } + return NULL; +} + + + +/* + * Search the environment of a builtin command. + */ + +static const char * +bltinlookup(const char *name) +{ + const struct strlist *sp; + + for (sp = cmdenviron ; sp ; sp = sp->next) { + if (varequal(sp->text, name)) + return strchr(sp->text, '=') + 1; + } + return lookupvar(name); +} + + + +/* + * Generate a list of exported variables. This routine is used to construct + * the third argument to execve when executing a program. + */ + +static char ** +environment() { + int nenv; + struct var **vpp; + struct var *vp; + char **env; + char **ep; + + nenv = 0; + for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { + for (vp = *vpp ; vp ; vp = vp->next) + if (vp->flags & VEXPORT) + nenv++; + } + ep = env = stalloc((nenv + 1) * sizeof *env); + for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { + for (vp = *vpp ; vp ; vp = vp->next) + if (vp->flags & VEXPORT) + *ep++ = vp->text; + } + *ep = NULL; + return env; +} + + +/* + * Called when a shell procedure is invoked to clear out nonexported + * variables. It is also necessary to reallocate variables of with + * VSTACK set since these are currently allocated on the stack. + */ + +static void +shprocvar(void) { + struct var **vpp; + struct var *vp, **prev; + + for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { + for (prev = vpp ; (vp = *prev) != NULL ; ) { + if ((vp->flags & VEXPORT) == 0) { + *prev = vp->next; + if ((vp->flags & VTEXTFIXED) == 0) + ckfree(vp->text); + if ((vp->flags & VSTRFIXED) == 0) + ckfree(vp); + } else { + if (vp->flags & VSTACK) { + vp->text = savestr(vp->text); + vp->flags &=~ VSTACK; + } + prev = &vp->next; + } + } + } + initvar(); +} + + + +/* + * Command to list all variables which are set. Currently this command + * is invoked from the set command when the set command is called without + * any variables. + */ + +static int +showvarscmd(argc, argv) + int argc; + char **argv; +{ + showvars(nullstr, VUNSET, VUNSET); + return 0; +} + + + +/* + * The export and readonly commands. + */ + +static int +exportcmd(argc, argv) + int argc; + char **argv; +{ + struct var *vp; + char *name; + const char *p; + int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT; + int pflag; + + listsetvar(cmdenviron); + pflag = (nextopt("p") == 'p'); + if (argc > 1 && !pflag) { + while ((name = *argptr++) != NULL) { + if ((p = strchr(name, '=')) != NULL) { + p++; + } else { + if ((vp = *findvar(hashvar(name), name))) { + vp->flags |= flag; + goto found; + } + } + setvar(name, p, flag); +found:; + } + } else { + showvars(argv[0], flag, 0); + } + return 0; +} + + +/* + * The "local" command. + */ + +/* funcnest nonzero if we are currently evaluating a function */ + +static int +localcmd(argc, argv) + int argc; + char **argv; +{ + char *name; + + if (! funcnest) + error("Not in a function"); + while ((name = *argptr++) != NULL) { + mklocal(name); + } + return 0; +} + + +/* + * Make a variable a local variable. When a variable is made local, it's + * value and flags are saved in a localvar structure. The saved values + * will be restored when the shell function returns. We handle the name + * "-" as a special case. + */ + +static void +mklocal(name) + char *name; + { + struct localvar *lvp; + struct var **vpp; + struct var *vp; + + INTOFF; + lvp = ckmalloc(sizeof (struct localvar)); + if (name[0] == '-' && name[1] == '\0') { + char *p; + p = ckmalloc(sizeof optet_vals); + lvp->text = memcpy(p, optet_vals, sizeof optet_vals); + vp = NULL; + } else { + vpp = hashvar(name); + vp = *findvar(vpp, name); + if (vp == NULL) { + if (strchr(name, '=')) + setvareq(savestr(name), VSTRFIXED); + else + setvar(name, NULL, VSTRFIXED); + vp = *vpp; /* the new variable */ + lvp->text = NULL; + lvp->flags = VUNSET; + } else { + lvp->text = vp->text; + lvp->flags = vp->flags; + vp->flags |= VSTRFIXED|VTEXTFIXED; + if (strchr(name, '=')) + setvareq(savestr(name), 0); + } + } + lvp->vp = vp; + lvp->next = localvars; + localvars = lvp; + INTON; +} + + +/* + * Called after a function returns. + */ + +static void +poplocalvars() { + struct localvar *lvp; + struct var *vp; + + while ((lvp = localvars) != NULL) { + localvars = lvp->next; + vp = lvp->vp; + if (vp == NULL) { /* $- saved */ + memcpy(optet_vals, lvp->text, sizeof optet_vals); + ckfree(lvp->text); + } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { + (void)unsetvar(vp->text); + } else { + if ((vp->flags & VTEXTFIXED) == 0) + ckfree(vp->text); + vp->flags = lvp->flags; + vp->text = lvp->text; + } + ckfree(lvp); + } +} + + +static int +setvarcmd(argc, argv) + int argc; + char **argv; +{ + if (argc <= 2) + return unsetcmd(argc, argv); + else if (argc == 3) + setvar(argv[1], argv[2], 0); + else + error("List assignment not implemented"); + return 0; +} + + +/* + * The unset builtin command. We unset the function before we unset the + * variable to allow a function to be unset when there is a readonly variable + * with the same name. + */ + +static int +unsetcmd(argc, argv) + int argc; + char **argv; +{ + char **ap; + int i; + int flg_func = 0; + int flg_var = 0; + int ret = 0; + + while ((i = nextopt("vf")) != '\0') { + if (i == 'f') + flg_func = 1; + else + flg_var = 1; + } + if (flg_func == 0 && flg_var == 0) + flg_var = 1; + + for (ap = argptr; *ap ; ap++) { + if (flg_func) + unsetfunc(*ap); + if (flg_var) + ret |= unsetvar(*ap); + } + return ret; +} + + +/* + * Unset the specified variable. + */ + +static int +unsetvar(const char *s) +{ + struct var **vpp; + struct var *vp; + + vpp = findvar(hashvar(s), s); + vp = *vpp; + if (vp) { + if (vp->flags & VREADONLY) + return (1); + INTOFF; + if (*(strchr(vp->text, '=') + 1) != '\0') + setvar(s, nullstr, 0); + vp->flags &= ~VEXPORT; + vp->flags |= VUNSET; + if ((vp->flags & VSTRFIXED) == 0) { + if ((vp->flags & VTEXTFIXED) == 0) + ckfree(vp->text); + *vpp = vp->next; + ckfree(vp); + } + INTON; + return (0); + } + + return (0); +} + + + +/* + * Find the appropriate entry in the hash table from the name. + */ + +static struct var ** +hashvar(const char *p) +{ + unsigned int hashval; + + hashval = ((unsigned char) *p) << 4; + while (*p && *p != '=') + hashval += (unsigned char) *p++; + return &vartab[hashval % VTABSIZE]; +} + + + +/* + * Returns true if the two strings specify the same varable. The first + * variable name is terminated by '='; the second may be terminated by + * either '=' or '\0'. + */ + +static int +varequal(const char *p, const char *q) +{ + while (*p == *q++) { + if (*p++ == '=') + return 1; + } + if (*p == '=' && *(q - 1) == '\0') + return 1; + return 0; +} + +static void +showvars(const char *myprefix, int mask, int xor) +{ + struct var **vpp; + struct var *vp; + const char *sep = myprefix == nullstr ? myprefix : spcstr; + + for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) { + for (vp = *vpp ; vp ; vp = vp->next) { + if ((vp->flags & mask) ^ xor) { + char *p; + int len; + + p = strchr(vp->text, '=') + 1; + len = p - vp->text; + p = single_quote(p); + + printf("%s%s%.*s%s\n", myprefix, sep, len, + vp->text, p); + stunalloc(p); + } + } + } +} + +static struct var ** +findvar(struct var **vpp, const char *name) +{ + for (; *vpp; vpp = &(*vpp)->next) { + if (varequal((*vpp)->text, name)) { + break; + } + } + return vpp; +} + +/* + * Copyright (c) 1999 Herbert Xu <herbert@debian.org> + * This file contains code for the times builtin. + * $Id: ash.c,v 1.1.1.4 2003/10/14 08:09:37 sparq Exp $ + */ +static int timescmd (int argc, char **argv) +{ + struct tms buf; + long int clk_tck = sysconf(_SC_CLK_TCK); + + times(&buf); + printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n", + (int) (buf.tms_utime / clk_tck / 60), + ((double) buf.tms_utime) / clk_tck, + (int) (buf.tms_stime / clk_tck / 60), + ((double) buf.tms_stime) / clk_tck, + (int) (buf.tms_cutime / clk_tck / 60), + ((double) buf.tms_cutime) / clk_tck, + (int) (buf.tms_cstime / clk_tck / 60), + ((double) buf.tms_cstime) / clk_tck); + return 0; +} + +#ifdef ASH_MATH_SUPPORT +/* The let builtin. */ +int letcmd(int argc, char **argv) +{ + int errcode; + long result=0; + if (argc == 2) { + char *tmp, *expression, p[13]; + expression = strchr(argv[1], '='); + if (!expression) { + /* Cannot use 'error()' here, or the return code + * will be incorrect */ + out2fmt("sh: let: syntax error: \"%s\"\n", argv[1]); + return 0; + } + *expression = '\0'; + tmp = ++expression; + result = arith(tmp, &errcode); + if (errcode < 0) { + /* Cannot use 'error()' here, or the return code + * will be incorrect */ + out2fmt("sh: let: "); + if(errcode == -2) + out2fmt("divide by zero"); + else + out2fmt("syntax error: \"%s=%s\"\n", argv[1], expression); + return 0; + } + snprintf(p, 12, "%ld", result); + setvar(argv[1], savestr(p), 0); + } else if (argc >= 3) + synerror("invalid operand"); + return !result; +} +#endif + + + +/*- + * Copyright (c) 1989, 1991, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change + * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> + * + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ |