1 /* vi: set sw=4 ts=4: */
3 * Mini grep implementation for busybox using libc regex.
5 * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
6 * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 /* BB_AUDIT SUSv3 defects - unsupported option -x "match whole line only". */
11 /* BB_AUDIT GNU defects - always acts as -a. */
12 /* http://www.opengroup.org/onlinepubs/007904975/utilities/grep.html */
14 * 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> -
15 * correction "-e pattern1 -e pattern2" logic and more optimizations.
18 * (C) 2006 Jac Goudsmit added -o option
21 //config: bool "grep (8.5 kb)"
24 //config: grep is used to search files for a specified pattern.
27 //config: bool "egrep (7.6 kb)"
30 //config: Alias to "grep -E".
33 //config: bool "fgrep (7.6 kb)"
36 //config: Alias to "grep -F".
38 //config:config FEATURE_GREP_CONTEXT
39 //config: bool "Enable before and after context flags (-A, -B and -C)"
41 //config: depends on GREP || EGREP || FGREP
43 //config: Print the specified number of leading (-B) and/or trailing (-A)
44 //config: context surrounding our matching lines.
45 //config: Print the specified number of context lines (-C).
47 //applet:IF_GREP(APPLET(grep, BB_DIR_BIN, BB_SUID_DROP))
48 // APPLET_ODDNAME:name main location suid_type help
49 //applet:IF_EGREP(APPLET_ODDNAME(egrep, grep, BB_DIR_BIN, BB_SUID_DROP, egrep))
50 //applet:IF_FGREP(APPLET_ODDNAME(fgrep, grep, BB_DIR_BIN, BB_SUID_DROP, fgrep))
52 //kbuild:lib-$(CONFIG_GREP) += grep.o
53 //kbuild:lib-$(CONFIG_EGREP) += grep.o
54 //kbuild:lib-$(CONFIG_FGREP) += grep.o
57 #include "common_bufsiz.h"
62 //usage:#define grep_trivial_usage
63 //usage: "[-HhnlLoqvsriwFE"
64 //usage: IF_EXTRA_COMPAT("z")
66 //usage: IF_FEATURE_GREP_CONTEXT("[-A/B/C N] ")
67 //usage: "PATTERN/-e PATTERN.../-f FILE [FILE]..."
68 //usage:#define grep_full_usage "\n\n"
69 //usage: "Search for PATTERN in FILEs (or stdin)\n"
70 //usage: "\n -H Add 'filename:' prefix"
71 //usage: "\n -h Do not add 'filename:' prefix"
72 //usage: "\n -n Add 'line_no:' prefix"
73 //usage: "\n -l Show only names of files that match"
74 //usage: "\n -L Show only names of files that don't match"
75 //usage: "\n -c Show only count of matching lines"
76 //usage: "\n -o Show only the matching part of line"
77 //usage: "\n -q Quiet. Return 0 if PATTERN is found, 1 otherwise"
78 //usage: "\n -v Select non-matching lines"
79 //usage: "\n -s Suppress open and read errors"
80 //usage: "\n -r Recurse"
81 //usage: "\n -i Ignore case"
82 //usage: "\n -w Match whole words only"
83 //usage: "\n -x Match whole lines only"
84 //usage: "\n -F PATTERN is a literal (not regexp)"
85 //usage: "\n -E PATTERN is an extended regexp"
86 //usage: IF_EXTRA_COMPAT(
87 //usage: "\n -z Input is NUL terminated"
89 //usage: "\n -m N Match up to N times per file"
90 //usage: IF_FEATURE_GREP_CONTEXT(
91 //usage: "\n -A N Print N lines of trailing context"
92 //usage: "\n -B N Print N lines of leading context"
93 //usage: "\n -C N Same as '-A N -B N'"
95 //usage: "\n -e PTRN Pattern to match"
96 //usage: "\n -f FILE Read pattern from file"
98 //usage:#define grep_example_usage
99 //usage: "$ grep root /etc/passwd\n"
100 //usage: "root:x:0:0:root:/root:/bin/bash\n"
101 //usage: "$ grep ^[rR]oo. /etc/passwd\n"
102 //usage: "root:x:0:0:root:/root:/bin/bash\n"
104 //usage:#define egrep_trivial_usage NOUSAGE_STR
105 //usage:#define egrep_full_usage ""
106 //usage:#define fgrep_trivial_usage NOUSAGE_STR
107 //usage:#define fgrep_full_usage ""
109 /* -e,-f are lists; -m,-A,-B,-C have numeric param */
110 #define OPTSTR_GREP \
111 "lnqvscFiHhe:*f:*Lorm:+wx" \
112 IF_FEATURE_GREP_CONTEXT("A:+B:+C:+") \
114 IF_EXTRA_COMPAT("z") \
116 /* ignored: -a "assume all files to be text" */
117 /* ignored: -I "assume binary files have no matches" */
119 OPTBIT_l, /* list matched file names only */
120 OPTBIT_n, /* print line# */
121 OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */
122 OPTBIT_v, /* invert the match, to select non-matching lines */
123 OPTBIT_s, /* suppress errors about file open errors */
124 OPTBIT_c, /* count matches per file (suppresses normal output) */
125 OPTBIT_F, /* literal match */
126 OPTBIT_i, /* case-insensitive */
127 OPTBIT_H, /* force filename display */
128 OPTBIT_h, /* inhibit filename display */
129 OPTBIT_e, /* -e PATTERN */
130 OPTBIT_f, /* -f FILE_WITH_PATTERNS */
131 OPTBIT_L, /* list unmatched file names only */
132 OPTBIT_o, /* show only matching parts of lines */
133 OPTBIT_r, /* recurse dirs */
134 OPTBIT_m, /* -m MAX_MATCHES */
135 OPTBIT_w, /* -w whole word match */
136 OPTBIT_x, /* -x whole line match */
137 IF_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */
138 IF_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */
139 IF_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */
140 OPTBIT_E, /* extended regexp */
141 IF_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */
142 OPT_l = 1 << OPTBIT_l,
143 OPT_n = 1 << OPTBIT_n,
144 OPT_q = 1 << OPTBIT_q,
145 OPT_v = 1 << OPTBIT_v,
146 OPT_s = 1 << OPTBIT_s,
147 OPT_c = 1 << OPTBIT_c,
148 OPT_F = 1 << OPTBIT_F,
149 OPT_i = 1 << OPTBIT_i,
150 OPT_H = 1 << OPTBIT_H,
151 OPT_h = 1 << OPTBIT_h,
152 OPT_e = 1 << OPTBIT_e,
153 OPT_f = 1 << OPTBIT_f,
154 OPT_L = 1 << OPTBIT_L,
155 OPT_o = 1 << OPTBIT_o,
156 OPT_r = 1 << OPTBIT_r,
157 OPT_m = 1 << OPTBIT_m,
158 OPT_w = 1 << OPTBIT_w,
159 OPT_x = 1 << OPTBIT_x,
160 OPT_A = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0,
161 OPT_B = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0,
162 OPT_C = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0,
163 OPT_E = 1 << OPTBIT_E,
164 OPT_z = IF_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0,
167 #define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l)
168 #define PRINT_LINE_NUM (option_mask32 & OPT_n)
169 #define BE_QUIET (option_mask32 & OPT_q)
170 #define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s)
171 #define PRINT_MATCH_COUNTS (option_mask32 & OPT_c)
172 #define FGREP_FLAG (option_mask32 & OPT_F)
173 #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
174 #define NUL_DELIMITED (option_mask32 & OPT_z)
178 #if !ENABLE_EXTRA_COMPAT
181 RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */
183 smalluint invert_search;
184 smalluint print_filename;
185 smalluint open_errors;
186 #if ENABLE_FEATURE_GREP_CONTEXT
187 smalluint did_print_line;
191 IF_EXTRA_COMPAT(size_t *before_buf_size;)
192 int last_line_printed;
194 /* globals used internally */
195 llist_t *pattern_head; /* growable list of patterns to match */
196 const char *cur_file; /* the current file we are reading */
198 #define G (*(struct globals*)bb_common_bufsiz1)
199 #define INIT_G() do { \
200 setup_common_bufsiz(); \
201 BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
203 #define max_matches (G.max_matches )
204 #if !ENABLE_EXTRA_COMPAT
205 # define reflags (G.reflags )
207 # define case_fold (G.case_fold )
208 /* http://www.delorie.com/gnu/docs/regex/regex_46.html */
209 # define reflags re_syntax_options
213 # define REG_NOSUB bug:is:here /* should not be used */
214 /* Just RE_SYNTAX_EGREP is not enough, need to enable {n[,[m]]} too */
215 # define REG_EXTENDED (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES)
216 # define REG_ICASE bug:is:here /* should not be used */
218 #define invert_search (G.invert_search )
219 #define print_filename (G.print_filename )
220 #define open_errors (G.open_errors )
221 #define did_print_line (G.did_print_line )
222 #define lines_before (G.lines_before )
223 #define lines_after (G.lines_after )
224 #define before_buf (G.before_buf )
225 #define before_buf_size (G.before_buf_size )
226 #define last_line_printed (G.last_line_printed )
227 #define pattern_head (G.pattern_head )
228 #define cur_file (G.cur_file )
231 typedef struct grep_list_data_t {
233 /* for GNU regex, matched_range must be persistent across grep_file() calls */
234 #if !ENABLE_EXTRA_COMPAT
235 regex_t compiled_regex;
236 regmatch_t matched_range;
238 struct re_pattern_buffer compiled_regex;
239 struct re_registers matched_range;
243 int flg_mem_allocated_compiled;
246 #if !ENABLE_EXTRA_COMPAT
247 #define print_line(line, line_len, linenum, decoration) \
248 print_line(line, linenum, decoration)
250 static void print_line(const char *line, size_t line_len, int linenum, char decoration)
252 #if ENABLE_FEATURE_GREP_CONTEXT
253 /* Happens when we go to next file, immediately hit match
254 * and try to print prev context... from prev file! Don't do it */
257 /* possibly print the little '--' separator */
258 if ((lines_before || lines_after) && did_print_line
259 && last_line_printed != linenum - 1
263 /* guard against printing "--" before first line of first file */
265 last_line_printed = linenum;
268 printf("%s%c", cur_file, decoration);
270 printf("%i%c", linenum, decoration);
271 /* Emulate weird GNU grep behavior with -ov */
272 if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o)) {
273 #if !ENABLE_EXTRA_COMPAT
276 fwrite(line, 1, line_len, stdout);
277 putchar(NUL_DELIMITED ? '\0' : '\n');
282 #if ENABLE_EXTRA_COMPAT
283 /* Unlike getline, this one removes trailing '\n' */
284 static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file)
288 int delim = (NUL_DELIMITED ? '\0' : '\n');
290 res_sz = getdelim(line_ptr, line_alloc_len, delim, file);
294 if (line[res_sz - 1] == delim)
295 line[--res_sz] = '\0';
297 free(line); /* uclibc allocates a buffer even on EOF. WTF? */
303 static int grep_file(FILE *file)
308 #if !ENABLE_EXTRA_COMPAT
313 size_t line_alloc_len;
314 # define rm_so start[0]
315 # define rm_eo end[0]
317 #if ENABLE_FEATURE_GREP_CONTEXT
318 int print_n_lines_after = 0;
319 int curpos = 0; /* track where we are in the circular 'before' buffer */
320 int idx = 0; /* used for iteration through the circular buffer */
322 enum { print_n_lines_after = 0 };
326 #if !ENABLE_EXTRA_COMPAT
327 (line = xmalloc_fgetline(file)) != NULL
329 (line_len = bb_getline(&line, &line_alloc_len, file)) >= 0
332 llist_t *pattern_ptr = pattern_head;
333 grep_list_data_t *gl = gl; /* for gcc */
337 while (pattern_ptr) {
338 gl = (grep_list_data_t *)pattern_ptr->data;
343 match = ((option_mask32 & OPT_i)
344 ? strcasestr(str, gl->pattern)
345 : strstr(str, gl->pattern)
348 if (option_mask32 & OPT_x) {
350 goto opt_f_not_found;
351 if (str[strlen(gl->pattern)] != '\0')
352 goto opt_f_not_found;
354 if (option_mask32 & OPT_w) {
355 char c = (match != line) ? match[-1] : ' ';
356 if (!isalnum(c) && c != '_') {
357 c = match[strlen(gl->pattern)];
358 if (!c || (!isalnum(c) && c != '_'))
369 #if ENABLE_EXTRA_COMPAT
376 if (!(gl->flg_mem_allocated_compiled & COMPILED)) {
377 gl->flg_mem_allocated_compiled |= COMPILED;
378 #if !ENABLE_EXTRA_COMPAT
379 xregcomp(&gl->compiled_regex, gl->pattern, reflags);
381 memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
382 gl->compiled_regex.translate = case_fold; /* for -i */
383 if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
384 bb_error_msg_and_die("bad regex '%s'", gl->pattern);
387 #if !ENABLE_EXTRA_COMPAT
388 gl->matched_range.rm_so = 0;
389 gl->matched_range.rm_eo = 0;
396 //bb_error_msg("'%s' start_pos:%d line_len:%d", match_at, start_pos, line_len);
398 #if !ENABLE_EXTRA_COMPAT
399 regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, match_flg) == 0
401 re_search(&gl->compiled_regex, match_at, line_len,
402 start_pos, /*range:*/ line_len,
403 &gl->matched_range) >= 0
406 if (option_mask32 & OPT_x) {
407 found = (gl->matched_range.rm_so == 0
408 && match_at[gl->matched_range.rm_eo] == '\0');
410 if (!(option_mask32 & OPT_w)) {
414 if (match_at > line || gl->matched_range.rm_so != 0) {
415 c = match_at[gl->matched_range.rm_so - 1];
417 if (!isalnum(c) && c != '_') {
418 c = match_at[gl->matched_range.rm_eo];
420 if (!isalnum(c) && c != '_') {
424 * Why check gl->matched_range.rm_eo?
425 * Zero-length match makes -w skip the line:
426 * "echo foo | grep ^" prints "foo",
427 * "echo foo | grep -w ^" prints nothing.
428 * Without such check, we can loop forever.
430 #if !ENABLE_EXTRA_COMPAT
431 if (gl->matched_range.rm_eo != 0) {
432 match_at += gl->matched_range.rm_eo;
433 match_flg |= REG_NOTBOL;
437 if (gl->matched_range.rm_eo > start_pos) {
438 start_pos = gl->matched_range.rm_eo;
446 /* If it's non-inverted search, we can stop
448 if (found && !invert_search)
450 pattern_ptr = pattern_ptr->link;
451 } /* while (pattern_ptr) */
453 if (found ^ invert_search) {
455 /* keep track of matches */
458 /* quiet/print (non)matching file names only? */
459 if (option_mask32 & (OPT_q|OPT_l|OPT_L)) {
460 free(line); /* we don't need line anymore */
462 /* manpage says about -q:
463 * "exit immediately with zero status
464 * if any match is found,
465 * even if errors were detected" */
468 /* if we're just printing filenames, we stop after the first match */
469 if (PRINT_FILES_WITH_MATCHES) {
471 /* fall through to "return 1" */
473 /* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
474 return 1; /* one match */
477 #if ENABLE_FEATURE_GREP_CONTEXT
478 /* Were we printing context and saw next (unwanted) match? */
479 if ((option_mask32 & OPT_m) && nmatches > max_matches)
483 /* print the matched line */
484 if (PRINT_MATCH_COUNTS == 0) {
485 #if ENABLE_FEATURE_GREP_CONTEXT
486 int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
488 /* if we were told to print 'before' lines and there is at least
489 * one line in the circular buffer, print them */
490 if (lines_before && before_buf[prevpos] != NULL) {
491 int first_buf_entry_line_num = linenum - lines_before;
493 /* advance to the first entry in the circular buffer, and
494 * figure out the line number is of the first line in the
497 while (before_buf[idx] == NULL) {
498 idx = (idx + 1) % lines_before;
499 first_buf_entry_line_num++;
502 /* now print each line in the buffer, clearing them as we go */
503 while (before_buf[idx] != NULL) {
504 print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-');
505 free(before_buf[idx]);
506 before_buf[idx] = NULL;
507 idx = (idx + 1) % lines_before;
508 first_buf_entry_line_num++;
512 /* make a note that we need to print 'after' lines */
513 print_n_lines_after = lines_after;
515 if (option_mask32 & OPT_o) {
517 /* -Fo just prints the pattern
518 * (unless -v: -Fov doesn't print anything at all) */
520 print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
522 unsigned start = gl->matched_range.rm_so;
523 unsigned end = gl->matched_range.rm_eo;
524 unsigned len = end - start;
525 char old = line[end];
527 /* Empty match is not printed: try "echo test | grep -o ''" */
529 print_line(line + start, len, linenum, ':');
535 #if !ENABLE_EXTRA_COMPAT
536 if (regexec(&gl->compiled_regex, line + end,
537 1, &gl->matched_range, REG_NOTBOL) != 0)
539 gl->matched_range.rm_so += end;
540 gl->matched_range.rm_eo += end;
542 if (re_search(&gl->compiled_regex, line, line_len,
544 &gl->matched_range) < 0)
549 print_line(line, line_len, linenum, ':');
553 #if ENABLE_FEATURE_GREP_CONTEXT
554 else { /* no match */
555 /* if we need to print some context lines after the last match, do so */
556 if (print_n_lines_after) {
557 print_line(line, strlen(line), linenum, '-');
558 print_n_lines_after--;
559 } else if (lines_before) {
560 /* Add the line to the circular 'before' buffer */
561 free(before_buf[curpos]);
562 before_buf[curpos] = line;
563 IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
564 curpos = (curpos + 1) % lines_before;
565 /* avoid free(line) - we took the line */
570 #endif /* ENABLE_FEATURE_GREP_CONTEXT */
571 #if !ENABLE_EXTRA_COMPAT
574 /* Did we print all context after last requested match? */
575 if ((option_mask32 & OPT_m)
576 && !print_n_lines_after
577 && nmatches == max_matches
581 } /* while (read line) */
583 /* special-case file post-processing for options where we don't print line
584 * matches, just filenames and possibly match counts */
586 /* grep -c: print [filename:]count, even if count is zero */
587 if (PRINT_MATCH_COUNTS) {
589 printf("%s:", cur_file);
590 printf("%d\n", nmatches);
593 /* grep -L: print just the filename */
594 if (PRINT_FILES_WITHOUT_MATCHES) {
595 /* nmatches is zero, no need to check it:
596 * we return 1 early if we detected a match
597 * and PRINT_FILES_WITHOUT_MATCHES is set */
604 #if ENABLE_FEATURE_CLEAN_UP
605 #define new_grep_list_data(p, m) add_grep_list_data(p, m)
606 static char *add_grep_list_data(char *pattern, int flg_used_mem)
608 #define new_grep_list_data(p, m) add_grep_list_data(p)
609 static char *add_grep_list_data(char *pattern)
612 grep_list_data_t *gl = xzalloc(sizeof(*gl));
613 gl->pattern = pattern;
614 #if ENABLE_FEATURE_CLEAN_UP
615 gl->flg_mem_allocated_compiled = flg_used_mem;
617 /*gl->flg_mem_allocated_compiled = 0;*/
622 static void load_regexes_from_file(llist_t *fopt)
628 char *ffile = cur->data;
632 fp = xfopen_stdin(ffile);
633 while ((line = xmalloc_fgetline(fp)) != NULL) {
634 llist_add_to(&pattern_head,
635 new_grep_list_data(line, ALLOCATED));
637 fclose_if_not_stdin(fp);
641 static int FAST_FUNC file_action_grep(const char *filename,
642 struct stat *statbuf,
644 int depth UNUSED_PARAM)
648 /* If we are given a link to a directory, we should bail out now, rather
649 * than trying to open the "file" and hoping getline gives us nothing,
650 * since that is not portable across operating systems (FreeBSD for
651 * example will return the raw directory contents). */
652 if (S_ISLNK(statbuf->st_mode)) {
654 if (stat(filename, &sb) != 0) {
655 if (!SUPPRESS_ERR_MSGS)
656 bb_simple_perror_msg(filename);
659 if (S_ISDIR(sb.st_mode))
663 file = fopen_for_read(filename);
665 if (!SUPPRESS_ERR_MSGS)
666 bb_simple_perror_msg(filename);
671 *(int*)matched += grep_file(file);
676 static int grep_dir(const char *dir)
679 recursive_action(dir,
680 /* recurse=yes */ ACTION_RECURSE |
681 /* followLinks=command line only */ ACTION_FOLLOWLINKS_L0 |
682 /* depthFirst=yes */ ACTION_DEPTHFIRST,
683 /* fileAction= */ file_action_grep,
684 /* dirAction= */ NULL,
685 /* userData= */ &matched,
690 int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
691 int grep_main(int argc UNUSED_PARAM, char **argv)
695 llist_t *fopt = NULL;
696 #if ENABLE_FEATURE_GREP_CONTEXT
701 /* For grep, exitcode of 1 is "not found". Other errors are 2: */
702 xfunc_error_retval = 2;
704 /* do normal option parsing */
705 #if ENABLE_FEATURE_GREP_CONTEXT
706 /* -H unsets -h; -C unsets -A,-B */
707 opts = getopt32(argv,
708 "^" OPTSTR_GREP "\0" "H-h:C-AB",
709 &pattern_head, &fopt, &max_matches,
710 &lines_after, &lines_before, &Copt);
713 /* -C unsets prev -A and -B, but following -A or -B
715 if (!(opts & OPT_A)) /* not overridden */
717 if (!(opts & OPT_B)) /* not overridden */
721 if (opts & (OPT_c|OPT_q|OPT_l|OPT_L)) {
722 option_mask32 &= ~OPT_n;
725 } else if (lines_before > 0) {
726 if (lines_before > INT_MAX / sizeof(long long))
727 lines_before = INT_MAX / sizeof(long long);
728 /* overflow in (lines_before * sizeof(x)) is prevented (above) */
729 before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
730 IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
733 /* with auto sanity checks */
734 getopt32(argv, "^" OPTSTR_GREP "\0" "H-h:c-n:q-n:l-n:", // why trailing ":"?
735 &pattern_head, &fopt, &max_matches);
737 invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
739 { /* convert char **argv to grep_list_data_t */
741 for (cur = pattern_head; cur; cur = cur->link)
742 cur->data = new_grep_list_data(cur->data, 0);
744 if (option_mask32 & OPT_f) {
745 load_regexes_from_file(fopt);
746 if (!pattern_head) { /* -f EMPTY_FILE? */
747 /* GNU grep treats it as "nothing matches" */
748 llist_add_to(&pattern_head, new_grep_list_data((char*) "", 0));
753 if (ENABLE_FGREP && applet_name[0] == 'f')
754 option_mask32 |= OPT_F;
756 #if !ENABLE_EXTRA_COMPAT
757 if (!(option_mask32 & (OPT_o | OPT_w | OPT_x)))
761 if ((ENABLE_EGREP && applet_name[0] == 'e')
762 || (option_mask32 & OPT_E)
764 reflags |= REG_EXTENDED;
766 #if ENABLE_EXTRA_COMPAT
768 reflags = RE_SYNTAX_GREP;
772 if (option_mask32 & OPT_i) {
773 #if !ENABLE_EXTRA_COMPAT
774 reflags |= REG_ICASE;
777 case_fold = xmalloc(256);
778 for (i = 0; i < 256; i++)
779 case_fold[i] = (unsigned char)i;
780 for (i = 'a'; i <= 'z'; i++)
781 case_fold[i] = (unsigned char)(i - ('a' - 'A'));
787 /* if we didn't get a pattern from -e and no command file was specified,
788 * first parameter should be the pattern. no pattern, no worky */
789 if (pattern_head == NULL) {
793 pattern = new_grep_list_data(*argv++, 0);
794 llist_add_to(&pattern_head, pattern);
797 /* argv[0..(argc-1)] should be names of file to grep through. If
798 * there is more than one file to grep, we will print the filenames. */
799 if (argv[0] && argv[1])
801 /* -H / -h of course override */
802 if (option_mask32 & OPT_H)
804 if (option_mask32 & OPT_h)
807 /* If no files were specified, or '-' was specified, take input from
808 * stdin. Otherwise, we grep through all the files specified. */
813 if (!cur_file || LONE_DASH(cur_file)) {
814 cur_file = "(standard input)";
816 if (option_mask32 & OPT_r) {
818 if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
819 if (!(option_mask32 & OPT_h))
821 matched += grep_dir(cur_file);
825 /* else: fopen(dir) will succeed, but reading won't */
826 file = fopen_for_read(cur_file);
828 if (!SUPPRESS_ERR_MSGS)
829 bb_simple_perror_msg(cur_file);
834 matched += grep_file(file);
835 fclose_if_not_stdin(file);
837 } while (*argv && *++argv);
839 /* destroy all the elements in the pattern list */
840 if (ENABLE_FEATURE_CLEAN_UP) {
841 while (pattern_head) {
842 llist_t *pattern_head_ptr = pattern_head;
843 grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data;
845 pattern_head = pattern_head->link;
846 if (gl->flg_mem_allocated_compiled & ALLOCATED)
848 if (gl->flg_mem_allocated_compiled & COMPILED)
849 regfree(&gl->compiled_regex);
851 free(pattern_head_ptr);
854 /* 0 = success, 1 = failed, 2 = error */
857 return !matched; /* invert return value: 0 = success, 1 = failed */