diff options
Diffstat (limited to 'release/src/router/busybox/coreutils/dd.c')
| -rw-r--r-- | release/src/router/busybox/coreutils/dd.c | 438 |
1 files changed, 295 insertions, 143 deletions
diff --git a/release/src/router/busybox/coreutils/dd.c b/release/src/router/busybox/coreutils/dd.c index cd97b24e..38dacc71 100644 --- a/release/src/router/busybox/coreutils/dd.c +++ b/release/src/router/busybox/coreutils/dd.c @@ -5,199 +5,351 @@ * * Copyright (C) 2000,2001 Matt Kraai * - * 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 - * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ -#include <sys/types.h> -#include <sys/stat.h> -#include <stdlib.h> -#include <stdio.h> -#include <unistd.h> -#include <string.h> -#include <fcntl.h> -#include "busybox.h" +#include "libbb.h" + +/* This is a NOEXEC applet. Be very careful! */ +enum { + ifd = STDIN_FILENO, + ofd = STDOUT_FILENO, +}; + static const struct suffix_mult dd_suffixes[] = { { "c", 1 }, { "w", 2 }, { "b", 512 }, { "kD", 1000 }, { "k", 1024 }, + { "K", 1024 }, /* compat with coreutils dd */ { "MD", 1000000 }, { "M", 1048576 }, { "GD", 1000000000 }, { "G", 1073741824 }, - { NULL, 0 } + { } +}; + +struct globals { + off_t out_full, out_part, in_full, in_part; }; +#define G (*(struct globals*)&bb_common_bufsiz1) +/* We have to zero it out because of NOEXEC */ +#define INIT_G() memset(&G, 0, sizeof(G)) + + +static void dd_output_status(int UNUSED_PARAM cur_signal) +{ + /* Deliberately using %u, not %d */ + fprintf(stderr, "%"OFF_FMT"u+%"OFF_FMT"u records in\n" + "%"OFF_FMT"u+%"OFF_FMT"u records out\n", + G.in_full, G.in_part, + G.out_full, G.out_part); +} + +static ssize_t full_write_or_warn(const void *buf, size_t len, + const char *const filename) +{ + ssize_t n = full_write(ofd, buf, len); + if (n < 0) + bb_perror_msg("writing '%s'", filename); + return n; +} + +static bool write_and_stats(const void *buf, size_t len, size_t obs, + const char *filename) +{ + ssize_t n = full_write_or_warn(buf, len, filename); + if (n < 0) + return 1; + if ((size_t)n == obs) + G.out_full++; + else if (n) /* > 0 */ + G.out_part++; + return 0; +} -int dd_main(int argc, char **argv) +#if ENABLE_LFS +#define XATOU_SFX xatoull_sfx +#else +#define XATOU_SFX xatoul_sfx +#endif + +int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int dd_main(int argc UNUSED_PARAM, char **argv) { - size_t out_full = 0; - size_t out_part = 0; - size_t in_full = 0; - size_t in_part = 0; - size_t count = -1; - size_t bs = 512; - ssize_t n; - off_t seek = 0; - off_t skip = 0; - int sync_flag = FALSE; - int noerror = FALSE; - int trunc = TRUE; - int oflag; - int ifd; - int ofd; - int i; - const char *infile = NULL; - const char *outfile = NULL; - char *buf; - - for (i = 1; i < argc; i++) { - if (strncmp("bs=", argv[i], 3) == 0) - bs = bb_xparse_number(argv[i]+3, dd_suffixes); - else if (strncmp("count=", argv[i], 6) == 0) - count = bb_xparse_number(argv[i]+6, dd_suffixes); - else if (strncmp("seek=", argv[i], 5) == 0) - seek = bb_xparse_number(argv[i]+5, dd_suffixes); - else if (strncmp("skip=", argv[i], 5) == 0) - skip = bb_xparse_number(argv[i]+5, dd_suffixes); - else if (strncmp("if=", argv[i], 3) == 0) - infile = argv[i]+3; - else if (strncmp("of=", argv[i], 3) == 0) - outfile = argv[i]+3; - else if (strncmp("conv=", argv[i], 5) == 0) { - buf = argv[i]+5; + enum { + /* Must be in the same order as OP_conv_XXX! */ + /* (see "flags |= (1 << what)" below) */ + FLAG_NOTRUNC = 1 << 0, + FLAG_SYNC = 1 << 1, + FLAG_NOERROR = 1 << 2, + FLAG_FSYNC = 1 << 3, + /* end of conv flags */ + FLAG_TWOBUFS = 1 << 4, + FLAG_COUNT = 1 << 5, + }; + static const char keywords[] ALIGN1 = + "bs\0""count\0""seek\0""skip\0""if\0""of\0" +#if ENABLE_FEATURE_DD_IBS_OBS + "ibs\0""obs\0""conv\0" +#endif + ; +#if ENABLE_FEATURE_DD_IBS_OBS + static const char conv_words[] ALIGN1 = + "notrunc\0""sync\0""noerror\0""fsync\0"; +#endif + enum { + OP_bs = 0, + OP_count, + OP_seek, + OP_skip, + OP_if, + OP_of, +#if ENABLE_FEATURE_DD_IBS_OBS + OP_ibs, + OP_obs, + OP_conv, + /* Must be in the same order as FLAG_XXX! */ + OP_conv_notrunc = 0, + OP_conv_sync, + OP_conv_noerror, + OP_conv_fsync, + /* Unimplemented conv=XXX: */ + //nocreat do not create the output file + //excl fail if the output file already exists + //fdatasync physically write output file data before finishing + //swab swap every pair of input bytes + //lcase change upper case to lower case + //ucase change lower case to upper case + //block pad newline-terminated records with spaces to cbs-size + //unblock replace trailing spaces in cbs-size records with newline + //ascii from EBCDIC to ASCII + //ebcdic from ASCII to EBCDIC + //ibm from ASCII to alternate EBCDIC +#endif + }; + int exitcode = EXIT_FAILURE; + size_t ibs = 512, obs = 512; + ssize_t n, w; + char *ibuf, *obuf; + /* And these are all zeroed at once! */ + struct { + int flags; + size_t oc; + off_t count; + off_t seek, skip; + const char *infile, *outfile; + } Z; +#define flags (Z.flags ) +#define oc (Z.oc ) +#define count (Z.count ) +#define seek (Z.seek ) +#define skip (Z.skip ) +#define infile (Z.infile ) +#define outfile (Z.outfile) + + memset(&Z, 0, sizeof(Z)); + INIT_G(); + //fflush(NULL); - is this needed because of NOEXEC? + +#if ENABLE_FEATURE_DD_SIGNAL_HANDLING + signal_SA_RESTART_empty_mask(SIGUSR1, dd_output_status); +#endif + + for (n = 1; argv[n]; n++) { + int what; + char *val; + char *arg = argv[n]; + +#if ENABLE_DESKTOP + /* "dd --". NB: coreutils 6.9 will complain if they see + * more than one of them. We wouldn't. */ + if (arg[0] == '-' && arg[1] == '-' && arg[2] == '\0') + continue; +#endif + val = strchr(arg, '='); + if (val == NULL) + bb_show_usage(); + *val = '\0'; + what = index_in_strings(keywords, arg); + if (what < 0) + bb_show_usage(); + /* *val = '='; - to preserve ps listing? */ + val++; +#if ENABLE_FEATURE_DD_IBS_OBS + if (what == OP_ibs) { + /* Must fit into positive ssize_t */ + ibs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes); + /*continue;*/ + } + if (what == OP_obs) { + obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes); + /*continue;*/ + } + if (what == OP_conv) { while (1) { - if (strncmp("notrunc", buf, 7) == 0) { - trunc = FALSE; - buf += 7; - } else if (strncmp("sync", buf, 4) == 0) { - sync_flag = TRUE; - buf += 4; - } else if (strncmp("noerror", buf, 7) == 0) { - noerror = TRUE; - buf += 7; - } else { - bb_error_msg_and_die("invalid conversion `%s'", argv[i]+5); - } - if (buf[0] == '\0') + /* find ',', replace them with NUL so we can use val for + * index_in_strings() without copying. + * We rely on val being non-null, else strchr would fault. + */ + arg = strchr(val, ','); + if (arg) + *arg = '\0'; + what = index_in_strings(conv_words, val); + if (what < 0) + bb_error_msg_and_die(bb_msg_invalid_arg, val, "conv"); + flags |= (1 << what); + if (!arg) /* no ',' left, so this was the last specifier */ break; - if (buf[0] == ',') - buf++; + /* *arg = ','; - to preserve ps listing? */ + val = arg + 1; /* skip this keyword and ',' */ } - } else - bb_show_usage(); - } - - buf = xmalloc(bs); + continue; /* we trashed 'what', can't fall through */ + } +#endif + if (what == OP_bs) { + ibs = obs = xatoul_range_sfx(val, 1, ((size_t)-1L)/2, dd_suffixes); + /*continue;*/ + } + /* These can be large: */ + if (what == OP_count) { + flags |= FLAG_COUNT; + count = XATOU_SFX(val, dd_suffixes); + /*continue;*/ + } + if (what == OP_seek) { + seek = XATOU_SFX(val, dd_suffixes); + /*continue;*/ + } + if (what == OP_skip) { + skip = XATOU_SFX(val, dd_suffixes); + /*continue;*/ + } + if (what == OP_if) { + infile = val; + /*continue;*/ + } + if (what == OP_of) { + outfile = val; + /*continue;*/ + } + } /* end of "for (argv[n])" */ - if (infile != NULL) { - ifd = bb_xopen(infile, O_RDONLY); - } else { - ifd = STDIN_FILENO; +//XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever + ibuf = obuf = xmalloc(ibs); + if (ibs != obs) { + flags |= FLAG_TWOBUFS; + obuf = xmalloc(obs); + } + if (infile != NULL) + xmove_fd(xopen(infile, O_RDONLY), ifd); + else { infile = bb_msg_standard_input; } - if (outfile != NULL) { - oflag = O_WRONLY | O_CREAT; + int oflag = O_WRONLY | O_CREAT; - if (!seek && trunc) { + if (!seek && !(flags & FLAG_NOTRUNC)) oflag |= O_TRUNC; - } - if ((ofd = open(outfile, oflag, 0666)) < 0) { - bb_perror_msg_and_die("%s", outfile); - } + xmove_fd(xopen(outfile, oflag), ofd); - if (seek && trunc) { - if (ftruncate(ofd, seek * bs) < 0) { + if (seek && !(flags & FLAG_NOTRUNC)) { + if (ftruncate(ofd, seek * obs) < 0) { struct stat st; - if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) || - S_ISDIR (st.st_mode)) { - bb_perror_msg_and_die("%s", outfile); - } + if (fstat(ofd, &st) < 0 || S_ISREG(st.st_mode) || + S_ISDIR(st.st_mode)) + goto die_outfile; } } } else { - ofd = STDOUT_FILENO; outfile = bb_msg_standard_output; } - if (skip) { - if (lseek(ifd, skip * bs, SEEK_CUR) < 0) { - bb_perror_msg_and_die("%s", infile); + if (lseek(ifd, skip * ibs, SEEK_CUR) < 0) { + while (skip-- > 0) { + n = safe_read(ifd, ibuf, ibs); + if (n < 0) + goto die_infile; + if (n == 0) + break; + } } } - if (seek) { - if (lseek(ofd, seek * bs, SEEK_CUR) < 0) { - bb_perror_msg_and_die("%s", outfile); - } + if (lseek(ofd, seek * obs, SEEK_CUR) < 0) + goto die_outfile; } - while (in_full + in_part != count) { - if (noerror) { - /* Pre-zero the buffer when doing the noerror thing */ - memset(buf, '\0', bs); - } - n = safe_read(ifd, buf, bs); - if (n < 0) { - if (noerror) { - n = bs; - bb_perror_msg("%s", infile); - } else { - bb_perror_msg_and_die("%s", infile); - } - } - if (n == 0) { + while (!(flags & FLAG_COUNT) || (G.in_full + G.in_part != count)) { + if (flags & FLAG_NOERROR) /* Pre-zero the buffer if conv=noerror */ + memset(ibuf, 0, ibs); + n = safe_read(ifd, ibuf, ibs); + if (n == 0) break; - } - if (n == bs) { - in_full++; - } else { - in_part++; - } - if (sync_flag) { - memset(buf + n, '\0', bs - n); - n = bs; - } - n = bb_full_write(ofd, buf, n); if (n < 0) { - bb_perror_msg_and_die("%s", outfile); + if (!(flags & FLAG_NOERROR)) + goto die_infile; + n = ibs; + bb_simple_perror_msg(infile); } - if (n == bs) { - out_full++; - } else { - out_part++; + if ((size_t)n == ibs) + G.in_full++; + else { + G.in_part++; + if (flags & FLAG_SYNC) { + memset(ibuf + n, '\0', ibs - n); + n = ibs; + } + } + if (flags & FLAG_TWOBUFS) { + char *tmp = ibuf; + while (n) { + size_t d = obs - oc; + + if (d > (size_t)n) + d = n; + memcpy(obuf + oc, tmp, d); + n -= d; + tmp += d; + oc += d; + if (oc == obs) { + if (write_and_stats(obuf, obs, obs, outfile)) + goto out_status; + oc = 0; + } + } + } else if (write_and_stats(ibuf, n, obs, outfile)) + goto out_status; + + if (flags & FLAG_FSYNC) { + if (fsync(ofd) < 0) + goto die_outfile; } } - if (close (ifd) < 0) { - bb_perror_msg_and_die("%s", infile); + if (ENABLE_FEATURE_DD_IBS_OBS && oc) { + w = full_write_or_warn(obuf, oc, outfile); + if (w < 0) goto out_status; + if (w > 0) G.out_part++; + } + if (close(ifd) < 0) { + die_infile: + bb_simple_perror_msg_and_die(infile); } - if (close (ofd) < 0) { - bb_perror_msg_and_die("%s", outfile); + if (close(ofd) < 0) { + die_outfile: + bb_simple_perror_msg_and_die(outfile); } - fprintf(stderr, "%ld+%ld records in\n%ld+%ld records out\n", - (long)in_full, (long)in_part, - (long)out_full, (long)out_part); + exitcode = EXIT_SUCCESS; + out_status: + dd_output_status(0); - return EXIT_SUCCESS; + return exitcode; } |