/* * sed.c - very minimalist version of sed * * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley * Copyright (C) 1999,2000,2001 by Mark Whitley * Copyright (C) 2002 Matt Kraai * Copyright (C) 2003 by Glenn McGrath * * 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 * */ /* Supported features and commands in this version of sed: - comments ('#') - address matching: num|/matchstr/[,num|/matchstr/|$]command - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags) - edit commands: (a)ppend, (i)nsert, (c)hange - file commands: (r)ead - backreferences in substitution expressions (\1, \2...\9) - grouped commands: {cmd1;cmd2} - transliteration (y/source-chars/dest-chars/) - pattern space hold space storing / swapping (g, h, x) - labels / branching (: label, b, t) (Note: Specifying an address (range) to match is *optional*; commands default to the whole pattern space if no specific address match was requested.) Unsupported features: - GNU extensions - and lots, lots more. Bugs: - Cant subst globally using ^ or $ in regex, eg. "aah" | sed 's/^a/b/g' Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html */ #include #include /* for getopt() */ #include #include /* for strdup() */ #include #include /* for isspace() */ #include #include "busybox.h" typedef struct sed_cmd_s { /* Order by alignment requirements */ /* address storage */ regex_t *beg_match; /* sed -e '/match/cmd' */ regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */ int beg_line; /* 'sed 1p' 0 == no begining line, apply commands to all lines */ int end_line; /* 'sed 1,3p' 0 == no end line, use only beginning. -1 == $ */ /* inversion flag */ int invert; /* the '!' after the address */ // int block_cmd; /* This command is part of a group that has a command address */ /* SUBSTITUTION COMMAND SPECIFIC FIELDS */ /* sed -e 's/sub_match/replace/' */ regex_t *sub_match; char *replace; /* EDIT COMMAND (a,i,c) SPECIFIC FIELDS */ char *editline; /* FILE COMMAND (r) SPECIFIC FIELDS */ char *filename; /* SUBSTITUTION COMMAND SPECIFIC FIELDS */ unsigned int num_backrefs:4; /* how many back references (\1..\9) */ /* Note: GNU/POSIX sed does not save more than nine backrefs, so * we only use 4 bits to hold the number */ unsigned int sub_g:1; /* sed -e 's/foo/bar/g' (global) */ unsigned int sub_p:1; /* sed -e 's/foo/bar/p' (print substitution) */ /* TRANSLATE COMMAND */ char *translate; /* GENERAL FIELDS */ /* the command */ char cmd; /* p,d,s (add more at your leisure :-) */ /* Branch commands */ char *label; /* next command in list (sequential list of specified commands) */ struct sed_cmd_s *next; } sed_cmd_t; /* externs */ extern void xregcomp(regex_t * preg, const char *regex, int cflags); extern int optind; /* in unistd.h */ extern char *optarg; /* ditto */ /* globals */ /* options */ static int be_quiet = 0; static const char bad_format_in_subst[] = "bad format in substitution expression"; /* linked list of sed commands */ static sed_cmd_t sed_cmd_head; static sed_cmd_t *sed_cmd_tail = &sed_cmd_head; const char *const semicolon_whitespace = "; \n\r\t\v\0"; static regex_t *previous_regex_ptr = NULL; #ifdef CONFIG_FEATURE_CLEAN_UP static void destroy_cmd_strs(void) { sed_cmd_t *sed_cmd = sed_cmd_head.next; while (sed_cmd) { sed_cmd_t *sed_cmd_next = sed_cmd->next; if (sed_cmd->beg_match) { regfree(sed_cmd->beg_match); free(sed_cmd->beg_match); } if (sed_cmd->end_match) { regfree(sed_cmd->end_match); free(sed_cmd->end_match); } if (sed_cmd->sub_match) { regfree(sed_cmd->sub_match); free(sed_cmd->sub_match); } free(sed_cmd->replace); free(sed_cmd); sed_cmd = sed_cmd_next; } } #endif /* * index_of_next_unescaped_regexp_delim - walks left to right through a string * beginning at a specified index and returns the index of the next regular * expression delimiter (typically a forward * slash ('/')) not preceeded by * a backslash ('\'). */ static int index_of_next_unescaped_regexp_delim(const char delimiter, const char *str) { int bracket = -1; int escaped = 0; int idx = 0; char ch; for (; (ch = str[idx]); idx++) { if (bracket != -1) { if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2 && str[idx - 1] == '^'))) bracket = -1; } else if (escaped) escaped = 0; else if (ch == '\\') escaped = 1; else if (ch == '[') bracket = idx; else if (ch == delimiter) return idx; } /* if we make it to here, we've hit the end of the string */ return -1; } static int parse_regex_delim(const char *cmdstr, char **match, char **replace) { const char *cmdstr_ptr = cmdstr; char delimiter; int idx = 0; /* verify that the 's' is followed by something. That something * (typically a 'slash') is now our regexp delimiter... */ if (*cmdstr == '\0') bb_error_msg_and_die(bad_format_in_subst); else delimiter = *cmdstr_ptr; cmdstr_ptr++; /* save the match string */ idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr); if (idx == -1) { bb_error_msg_and_die(bad_format_in_subst); } *match = bb_xstrndup(cmdstr_ptr, idx); /* save the replacement string */ cmdstr_ptr += idx + 1; idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr); if (idx == -1) { bb_error_msg_and_die(bad_format_in_subst); } *replace = bb_xstrndup(cmdstr_ptr, idx); return ((cmdstr_ptr - cmdstr) + idx); } /* * returns the index in the string just past where the address ends. */ static int get_address(char *my_str, int *linenum, regex_t ** regex) { int idx = 0; if (isdigit(my_str[idx])) { char *endstr; *linenum = strtol(my_str, &endstr, 10); /* endstr shouldnt ever equal NULL */ idx = endstr - my_str; } else if (my_str[idx] == '$') { *linenum = -1; idx++; } else if (my_str[idx] == '/' || my_str[idx] == '\\') { int idx_start = 1; char delimiter; delimiter = '/'; if (my_str[idx] == '\\') { idx_start++; delimiter = my_str[++idx]; } idx++; idx += index_of_next_unescaped_regexp_delim(delimiter, my_str + idx); if (idx == -1) { bb_error_msg_and_die("unterminated match expression"); } my_str[idx] = '\0'; *regex = (regex_t *) xmalloc(sizeof(regex_t)); xregcomp(*regex, my_str + idx_start, REG_NEWLINE); idx++; /* so it points to the next character after the last '/' */ } return idx; } static int parse_subst_cmd(sed_cmd_t * const sed_cmd, const char *substr) { int cflags = 0; char *match; int idx = 0; int j; /* * the string that gets passed to this function should look like this: * s/match/replace/gIp * || | ||| * mandatory optional * * (all three of the '/' slashes are mandatory) */ idx = parse_regex_delim(substr, &match, &sed_cmd->replace); /* determine the number of back references in the match string */ /* Note: we compute this here rather than in the do_subst_command() * function to save processor time, at the expense of a little more memory * (4 bits) per sed_cmd */ /* sed_cmd->num_backrefs = 0; *//* XXX: not needed? --apparently not */ for (j = 0; match[j]; j++) { /* GNU/POSIX sed does not save more than nine backrefs */ if (match[j] == '\\' && match[j + 1] == '(' && sed_cmd->num_backrefs <= 9) sed_cmd->num_backrefs++; } /* process the flags */ while (substr[++idx]) { switch (substr[idx]) { case 'g': sed_cmd->sub_g = 1; break; /* Hmm, i dont see the I option mentioned in the standard */ case 'I': cflags |= REG_ICASE; break; case 'p': sed_cmd->sub_p = 1; break; default: /* any whitespace or semicolon trailing after a s/// is ok */ if (strchr(semicolon_whitespace, substr[idx])) goto out; /* else */ bb_error_msg_and_die("bad option in substitution expression"); } } out: /* compile the match string into a regex */ if (*match != '\0') { /* If match is empty, we use last regex used at runtime */ sed_cmd->sub_match = (regex_t *) xmalloc(sizeof(regex_t)); xregcomp(sed_cmd->sub_match, match, cflags); } free(match); return idx; } static void replace_slash_n(char *string) { int i; int remaining = strlen(string); for (i = 0; string[i]; i++) { if ((string[i] == '\\') && (string[i + 1] == 'n')) { string[i] = '\n'; memmove(string + i + 1, string + i + 1, remaining - 1); } else { remaining--; } } } static int parse_translate_cmd(sed_cmd_t * const sed_cmd, const char *cmdstr) { char *match; char *replace; int idx; int i; idx = parse_regex_delim(cmdstr, &match, &replace); replace_slash_n(match); replace_slash_n(replace); sed_cmd->translate = xcalloc(1, (strlen(match) + 1) * 2); for (i = 0; (match[i] != 0) && (replace[i] != 0); i++) { sed_cmd->translate[i * 2] = match[i]; sed_cmd->translate[(i * 2) + 1] = replace[i]; } return (idx + 1); } static int parse_edit_cmd(sed_cmd_t * sed_cmd, const char *editstr) { int i, j; /* * the string that gets passed to this function should look like this: * * need one of these * | * | this backslash (immediately following the edit command) is mandatory * | | * [aic]\ * TEXT1\ * TEXT2\ * TEXTN * * as soon as we hit a TEXT line that has no trailing '\', we're done. * this means a command like: * * i\ * INSERTME * * is a-ok. * */ if ((*editstr != '\\') || ((editstr[1] != '\n') && (editstr[1] != '\r'))) { bb_error_msg_and_die("bad format in edit expression"); } /* store the edit line text */ sed_cmd->editline = xmalloc(strlen(&editstr[2]) + 2); for (i = 2, j = 0; editstr[i] != '\0' && strchr("\r\n", editstr[i]) == NULL; i++, j++) { if ((editstr[i] == '\\') && strchr("\n\r", editstr[i + 1]) != NULL) { sed_cmd->editline[j] = '\n'; i++; } else sed_cmd->editline[j] = editstr[i]; } /* figure out if we need to add a newline */ if (sed_cmd->editline[j - 1] != '\n') sed_cmd->editline[j++] = '\n'; /* terminate string */ sed_cmd->editline[j] = '\0'; return i; } static int parse_file_cmd(sed_cmd_t * sed_cmd, const char *filecmdstr) { int idx = 0; int filenamelen = 0; /* * the string that gets passed to this function should look like this: * '[ ]filename' * | | * | a filename * | * optional whitespace * re: the file to be read, the GNU manual says the following: "Note that * if filename cannot be read, it is treated as if it were an empty file, * without any error indication." Thus, all of the following commands are * perfectly leagal: * * sed -e '1r noexist' * sed -e '1r ;' * sed -e '1r' */ /* the file command may be followed by whitespace; move past it. */ while (isspace(filecmdstr[++idx])) {; } /* the first non-whitespace we get is a filename. the filename ends when we * hit a normal sed command terminator or end of string */ filenamelen = strcspn(&filecmdstr[idx], semicolon_whitespace); sed_cmd->filename = xmalloc(filenamelen + 1); safe_strncpy(sed_cmd->filename, &filecmdstr[idx], filenamelen + 1); return idx + filenamelen; } /* * Process the commands arguments */ static char *parse_cmd_str(sed_cmd_t * sed_cmd, char *cmdstr) { /* handle (s)ubstitution command */ if (sed_cmd->cmd == 's') { cmdstr += parse_subst_cmd(sed_cmd, cmdstr); } /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */ else if (strchr("aic", sed_cmd->cmd)) { if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c') bb_error_msg_and_die ("only a beginning address can be specified for edit commands"); cmdstr += parse_edit_cmd(sed_cmd, cmdstr); } /* handle file cmds: (r)ead */ else if (sed_cmd->cmd == 'r') { if (sed_cmd->end_line || sed_cmd->end_match) bb_error_msg_and_die("Command only uses one address"); cmdstr += parse_file_cmd(sed_cmd, cmdstr); } /* handle branch commands */ else if (strchr(":bt", sed_cmd->cmd)) { int length; cmdstr += strspn(cmdstr, " "); length = strcspn(cmdstr, "; \n"); sed_cmd->label = strndup(cmdstr, length); cmdstr += length; } /* translation command */ else if (sed_cmd->cmd == 'y') { cmdstr += parse_translate_cmd(sed_cmd, cmdstr); } /* if it wasnt a single-letter command that takes no arguments * then it must be an invalid command. */ else if (strchr("dgGhHnNpPqx={}", sed_cmd->cmd) == 0) { bb_error_msg_and_die("Unsupported command %c", sed_cmd->cmd); } /* give back whatever's left over */ return (cmdstr); } static char *add_cmd(sed_cmd_t * sed_cmd, char *cmdstr) { /* Skip over leading whitespace and semicolons */ cmdstr += strspn(cmdstr, semicolon_whitespace); /* if we ate the whole thing, that means there was just trailing * whitespace or a final / no-op semicolon. either way, get out */ if (*cmdstr == '\0') { return (NULL); } /* if this is a comment, jump past it and keep going */ if (*cmdstr == '#') { /* "#n" is the same as using -n on the command line */ if (cmdstr[1] == 'n') { be_quiet++; } return (strpbrk(cmdstr, "\n\r")); } /* parse the command * format is: [addr][,addr]cmd * |----||-----||-| * part1 part2 part3 */ /* first part (if present) is an address: either a '$', a number or a /regex/ */ cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match); /* second part (if present) will begin with a comma */ if (*cmdstr == ',') { int idx; cmdstr++; idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match); if (idx == 0) { bb_error_msg_and_die("get_address: no address found in string\n" "\t(you probably didn't check the string you passed me)"); } cmdstr += idx; } /* skip whitespace before the command */ while (isspace(*cmdstr)) { cmdstr++; } /* there my be the inversion flag between part2 and part3 */ if (*cmdstr == '!') { sed_cmd->invert = 1; cmdstr++; #ifdef SED_FEATURE_STRICT_CHECKING /* According to the spec * It is unspecified whether s can follow a '!' character, * and conforming applications shall not follow a '!' character * with s. */ if (isblank(cmdstr[idx]) { bb_error_msg_and_die("blank follows '!'");} #else /* skip whitespace before the command */ while (isspace(*cmdstr)) { cmdstr++; } #endif } /* last part (mandatory) will be a command */ if (*cmdstr == '\0') bb_error_msg_and_die("missing command"); sed_cmd->cmd = *cmdstr; cmdstr++; cmdstr = parse_cmd_str(sed_cmd, cmdstr); /* Add the command to the command array */ sed_cmd_tail->next = sed_cmd; sed_cmd_tail = sed_cmd_tail->next; return (cmdstr); } static void add_cmd_str(char *cmdstr) { #ifdef CONFIG_FEATURE_SED_EMBEDED_NEWLINE char *cmdstr_ptr = cmdstr; /* HACK: convert "\n" to match tranlated '\n' string */ while ((cmdstr_ptr = strstr(cmdstr_ptr, "\\n")) != NULL) { cmdstr = xrealloc(cmdstr, strlen(cmdstr) + 2); cmdstr_ptr = strstr(cmdstr, "\\n"); memmove(cmdstr_ptr + 1, cmdstr_ptr, strlen(cmdstr_ptr) + 1); cmdstr_ptr[0] = '\\'; cmdstr_ptr += 3; } #endif do { sed_cmd_t *sed_cmd; sed_cmd = xcalloc(1, sizeof(sed_cmd_t)); cmdstr = add_cmd(sed_cmd, cmdstr); } while (cmdstr && strlen(cmdstr)); } static void load_cmd_file(char *filename) { FILE *cmdfile; char *line; char *nextline; char *e; cmdfile = bb_xfopen(filename, "r"); while ((line = bb_get_line_from_file(cmdfile)) != NULL) { /* if a line ends with '\' it needs the next line appended to it */ while (((e = last_char_is(line, '\n')) != NULL) && (e > line) && (e[-1] == '\\') && ((nextline = bb_get_line_from_file(cmdfile)) != NULL)) { line = xrealloc(line, (e - line) + 1 + strlen(nextline) + 1); strcat(line, nextline); free(nextline); } /* eat trailing newline (if any) --if I don't do this, edit commands * (aic) will print an extra newline */ chomp(line); add_cmd_str(line); free(line); } } struct pipeline { char *buf; int idx; int len; }; #define PIPE_MAGIC 0x7f #define PIPE_GROW 64 void pipe_putc(struct pipeline *const pipeline, char c) { if (pipeline->buf[pipeline->idx] == PIPE_MAGIC) { pipeline->buf = xrealloc(pipeline->buf, pipeline->len + PIPE_GROW); memset(pipeline->buf + pipeline->len, 0, PIPE_GROW); pipeline->len += PIPE_GROW; pipeline->buf[pipeline->len - 1] = PIPE_MAGIC; } pipeline->buf[pipeline->idx++] = (c); } #define pipeputc(c) pipe_putc(pipeline, c) #if 0 { if (pipeline[pipeline_idx] == PIPE_MAGIC) { pipeline = xrealloc(pipeline, pipeline_len + PIPE_GROW); memset(pipeline + pipeline_len, 0, PIPE_GROW); pipeline_len += PIPE_GROW; pipeline[pipeline_len - 1] = PIPE_MAGIC; } pipeline[pipeline_idx++] = (c); } #endif static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t * regmatch, struct pipeline *const pipeline, int matches) { int i; /* go through the replacement string */ for (i = 0; replace[i]; i++) { /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */ if (replace[i] == '\\' && isdigit(replace[i + 1])) { int j; char tmpstr[2]; int backref; ++i; /* i now indexes the backref number, instead of the leading slash */ tmpstr[0] = replace[i]; tmpstr[1] = 0; backref = atoi(tmpstr); /* print out the text held in regmatch[backref] */ if (backref <= matches && regmatch[backref].rm_so != -1) for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++) pipeputc(line[j]); } /* if we find a backslash escaped character, print the character */ else if (replace[i] == '\\') { ++i; pipeputc(replace[i]); } /* if we find an unescaped '&' print out the whole matched text. * fortunately, regmatch[0] contains the indicies to the whole matched * expression (kinda seems like it was designed for just such a * purpose...) */ else if (replace[i] == '&') { int j; for (j = regmatch[0].rm_so; j < regmatch[0].rm_eo; j++) pipeputc(line[j]); } /* nothing special, just print this char of the replacement string to stdout */ else pipeputc(replace[i]); } } static int do_subst_command(sed_cmd_t * sed_cmd, char **line) { char *hackline = *line; struct pipeline thepipe = { NULL, 0, 0 }; struct pipeline *const pipeline = &thepipe; int altered = 0; int result; regmatch_t *regmatch = NULL; regex_t *current_regex; if (sed_cmd->sub_match == NULL) { current_regex = previous_regex_ptr; } else { previous_regex_ptr = current_regex = sed_cmd->sub_match; } result = regexec(current_regex, hackline, 0, NULL, 0); /* we only proceed if the substitution 'search' expression matches */ if (result == REG_NOMATCH) { return 0; } /* whaddaya know, it matched. get the number of back references */ regmatch = xmalloc(sizeof(regmatch_t) * (sed_cmd->num_backrefs + 1)); /* allocate more PIPE_GROW bytes if replaced string is larger than original */ thepipe.len = strlen(hackline) + PIPE_GROW; thepipe.buf = xcalloc(1, thepipe.len); /* buffer magic */ thepipe.buf[thepipe.len - 1] = PIPE_MAGIC; /* and now, as long as we've got a line to try matching and if we can match * the search string, we make substitutions */ while ((*hackline || !altered) && (regexec(current_regex, hackline, sed_cmd->num_backrefs + 1, regmatch, 0) != REG_NOMATCH)) { int i; /* print everything before the match */ for (i = 0; i < regmatch[0].rm_so; i++) pipeputc(hackline[i]); /* then print the substitution string */ print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch, pipeline, sed_cmd->num_backrefs); /* advance past the match */ hackline += regmatch[0].rm_eo; /* flag that something has changed */ altered++; /* if we're not doing this globally, get out now */ if (!sed_cmd->sub_g) { break; } } for (; *hackline; hackline++) pipeputc(*hackline); if (thepipe.buf[thepipe.idx] == PIPE_MAGIC) thepipe.buf[thepipe.idx] = 0; /* cleanup */ free(regmatch); free(*line); *line = thepipe.buf; return altered; } static sed_cmd_t *branch_to(const char *label) { sed_cmd_t *sed_cmd; for (sed_cmd = sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) { if ((sed_cmd->label) && (strcmp(sed_cmd->label, label) == 0)) { break; } } /* If no match returns last command */ return (sed_cmd); } static void process_file(FILE * file) { char *pattern_space; /* Posix requires it be able to hold at least 8192 bytes */ char *hold_space = NULL; /* Posix requires it be able to hold at least 8192 bytes */ static int linenum = 0; /* GNU sed does not restart counting lines at EOF */ unsigned int still_in_range = 0; int altered; int force_print; pattern_space = bb_get_chomped_line_from_file(file); if (pattern_space == NULL) { return; } /* go through every line in the file */ do { char *next_line; sed_cmd_t *sed_cmd; int substituted = 0; /* This enables whole blocks of commands to be mask'ed out if the lead address doesnt match */ int block_mask = 1; /* Read one line in advance so we can act on the last line, the '$' address */ next_line = bb_get_chomped_line_from_file(file); linenum++; altered = 0; force_print = 0; /* for every line, go through all the commands */ for (sed_cmd = sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) { int deleted = 0; /* * entry point into sedding... */ int matched = ( /* no range necessary */ (sed_cmd->beg_line == 0 && sed_cmd->end_line == 0 && sed_cmd->beg_match == NULL && sed_cmd->end_match == NULL) || /* this line number is the first address we're looking for */ (sed_cmd->beg_line > 0 && (sed_cmd->beg_line == linenum)) || /* this line matches our first address regex */ (sed_cmd->beg_match && (regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0) == 0)) || /* we are currently within the beginning & ending address range */ still_in_range || ((sed_cmd->beg_line == -1) && (next_line == NULL)) ); if (sed_cmd->cmd == '{') { block_mask = block_mask & matched; } // matched &= block_mask; if (sed_cmd->invert ^ (matched & block_mask)) { /* Update last used regex incase a blank substitute BRE is found */ if (sed_cmd->beg_match) { previous_regex_ptr = sed_cmd->beg_match; } /* * actual sedding */ switch (sed_cmd->cmd) { case '=': printf("%d\n", linenum); break; case 'P':{ /* Write the current pattern space upto the first newline */ char *tmp = strchr(pattern_space, '\n'); if (tmp) { *tmp = '\0'; } } case 'p': /* Write the current pattern space to output */ puts(pattern_space); break; case 'd': altered++; deleted = 1; break; case 's': /* * Some special cases for 's' printing to make it compliant with * GNU sed printing behavior (aka "The -n | s///p Matrix"): * * -n ONLY = never print anything regardless of any successful * substitution * * s///p ONLY = always print successful substitutions, even if * the pattern_space is going to be printed anyway (pattern_space * will be printed twice). * * -n AND s///p = print ONLY a successful substitution ONE TIME; * no other lines are printed - this is the reason why the 'p' * flag exists in the first place. */ #ifdef CONFIG_FEATURE_SED_EMBEDED_NEWLINE /* HACK: escape newlines twice so regex can match them */ { int offset = 0; while (strchr(pattern_space + offset, '\n') != NULL) { char *tmp; pattern_space = xrealloc(pattern_space, strlen(pattern_space) + 2); tmp = strchr(pattern_space + offset, '\n'); memmove(tmp + 1, tmp, strlen(tmp) + 1); tmp[0] = '\\'; tmp[1] = 'n'; offset = tmp - pattern_space + 2; } } #endif /* we print the pattern_space once, unless we were told to be quiet */ substituted = do_subst_command(sed_cmd, &pattern_space); #ifdef CONFIG_FEATURE_SED_EMBEDED_NEWLINE /* undo HACK: escape newlines twice so regex can match them */ { char *tmp = pattern_space; while ((tmp = strstr(tmp, "\\n")) != NULL) { memmove(tmp, tmp + 1, strlen(tmp + 1) + 1); tmp[0] = '\n'; } } #endif altered |= substituted; if (!be_quiet && altered && ((sed_cmd->next == NULL) || (sed_cmd->next->cmd != 's'))) { force_print = 1; } /* we also print the line if we were given the 'p' flag * (this is quite possibly the second printing) */ if ((sed_cmd->sub_p) && altered) { puts(pattern_space); } break; case 'a': puts(pattern_space); fputs(sed_cmd->editline, stdout); altered++; break; case 'i': fputs(sed_cmd->editline, stdout); break; case 'c': /* single-address case */ if ((sed_cmd->end_match == NULL && sed_cmd->end_line == 0) /* multi-address case */ /* - matching text */ || (sed_cmd->end_match && (regexec(sed_cmd->end_match, pattern_space, 0, NULL, 0) == 0)) /* - matching line numbers */ || (sed_cmd->end_line > 0 && sed_cmd->end_line == linenum)) { fputs(sed_cmd->editline, stdout); } altered++; break; case 'r':{ FILE *outfile; outfile = fopen(sed_cmd->filename, "r"); if (outfile) { char *line; while ((line = bb_get_chomped_line_from_file(outfile)) != NULL) { pattern_space = xrealloc(pattern_space, strlen(line) + strlen(pattern_space) + 2); strcat(pattern_space, "\n"); strcat(pattern_space, line); } bb_xprint_and_close_file(outfile); } } break; case 'q': /* Branch to end of script and quit */ deleted = 1; /* Exit the outer while loop */ free(next_line); next_line = NULL; break; case 'n': /* Read next line from input */ free(pattern_space); pattern_space = next_line; next_line = bb_get_chomped_line_from_file(file); linenum++; break; case 'N': /* Append the next line to the current line */ if (next_line) { pattern_space = realloc(pattern_space, strlen(pattern_space) + strlen(next_line) + 2); strcat(pattern_space, "\n"); strcat(pattern_space, next_line); next_line = bb_get_chomped_line_from_file(file); linenum++; } break; case 'b': sed_cmd = branch_to(sed_cmd->label); break; case 't': if (substituted) { sed_cmd = branch_to(sed_cmd->label); } break; case 'y':{ int i; for (i = 0; pattern_space[i] != 0; i++) { int j; for (j = 0; sed_cmd->translate[j]; j += 2) { if (pattern_space[i] == sed_cmd->translate[j]) { pattern_space[i] = sed_cmd->translate[j + 1]; } } } } break; case 'g': /* Replace pattern space with hold space */ free(pattern_space); pattern_space = strdup(hold_space); break; case 'G': { /* Append newline and hold space to pattern space */ int pattern_space_size = 0; if (pattern_space) { pattern_space_size = strlen(pattern_space); } pattern_space = xrealloc(pattern_space, pattern_space_size + strlen(hold_space) + 2); strcat(pattern_space, "\n"); strcat(pattern_space, hold_space); break; } case 'h': /* Replace hold space with pattern space */ free(hold_space); hold_space = strdup(pattern_space); break; case 'H': { /* Append newline and pattern space to hold space */ int hold_space_size = 0; if (hold_space) { hold_space_size = strlen(hold_space); } hold_space = xrealloc(hold_space, hold_space_size + strlen(pattern_space) + 2); strcat(hold_space, "\n"); strcat(hold_space, pattern_space); break; } case 'x':{ /* Swap hold and pattern space */ char *tmp = pattern_space; pattern_space = hold_space; hold_space = tmp; break; } } } /* * exit point from sedding... */ if (matched) { if ( /* this is a single-address command or... */ (sed_cmd->end_line == 0 && sed_cmd->end_match == NULL) /* If only one address */ /* we were in the middle of our address range (this * isn't the first time through) and.. */ || ((still_in_range == 1) /* this line number is the last address we're looking for or... */ && ((sed_cmd->end_line > 0 && (sed_cmd->end_line == linenum)) /* this line matches our last address regex */ || (sed_cmd->end_match && (regexec(sed_cmd->end_match, pattern_space, 0, NULL, 0) == 0))))) { /* we're out of our address range */ still_in_range = 0; } else { /* didn't hit the exit? then we're still in the middle of an address range */ still_in_range = 1; } } if (sed_cmd->cmd == '}') { block_mask = 1; } if (deleted) break; } /* we will print the line unless we were told to be quiet or if the * line was altered (via a 'd'elete or 's'ubstitution), in which case * the altered line was already printed */ if ((!be_quiet && !altered) || force_print) { puts(pattern_space); } free(pattern_space); pattern_space = next_line; } while (pattern_space); } extern int sed_main(int argc, char **argv) { int opt, status = EXIT_SUCCESS; #ifdef CONFIG_FEATURE_CLEAN_UP /* destroy command strings on exit */ if (atexit(destroy_cmd_strs) == -1) bb_perror_msg_and_die("atexit"); #endif /* do normal option parsing */ while ((opt = getopt(argc, argv, "ne:f:")) > 0) { switch (opt) { case 'n': be_quiet++; break; case 'e':{ char *str_cmd = strdup(optarg); add_cmd_str(str_cmd); free(str_cmd); break; } case 'f': load_cmd_file(optarg); break; default: bb_show_usage(); } } /* if we didn't get a pattern from a -e and no command file was specified, * argv[optind] should be the pattern. no pattern, no worky */ if (sed_cmd_head.next == NULL) { if (argv[optind] == NULL) bb_show_usage(); else { char *str_cmd = strdup(argv[optind]); add_cmd_str(strdup(str_cmd)); free(str_cmd); optind++; } } /* argv[(optind)..(argc-1)] should be names of file to process. If no * files were specified or '-' was specified, take input from stdin. * Otherwise, we process all the files specified. */ if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) { process_file(stdin); } else { int i; FILE *file; for (i = optind; i < argc; i++) { file = bb_wfopen(argv[i], "r"); if (file) { process_file(file); fclose(file); } else status = EXIT_FAILURE; } } return status; }