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 //applet:IF_GREP(APPLET(grep, BB_DIR_BIN, BB_SUID_DROP))
22 //applet:IF_FEATURE_GREP_EGREP_ALIAS(APPLET_ODDNAME(egrep, grep, BB_DIR_BIN, BB_SUID_DROP, egrep))
23 //applet:IF_FEATURE_GREP_FGREP_ALIAS(APPLET_ODDNAME(fgrep, grep, BB_DIR_BIN, BB_SUID_DROP, fgrep))
25 //kbuild:lib-$(CONFIG_GREP) += grep.o
31 //config: grep is used to search files for a specified pattern.
33 //config:config FEATURE_GREP_EGREP_ALIAS
34 //config: bool "Enable extended regular expressions (egrep & grep -E)"
36 //config: depends on GREP
38 //config: Enabled support for extended regular expressions. Extended
39 //config: regular expressions allow for alternation (foo|bar), grouping,
40 //config: and various repetition operators.
42 //config:config FEATURE_GREP_FGREP_ALIAS
43 //config: bool "Alias fgrep to grep -F"
45 //config: depends on GREP
47 //config: fgrep sees the search pattern as a normal string rather than
48 //config: regular expressions.
49 //config: grep -F always works, this just creates the fgrep alias.
51 //config:config FEATURE_GREP_CONTEXT
52 //config: bool "Enable before and after context flags (-A, -B and -C)"
54 //config: depends on GREP
56 //config: Print the specified number of leading (-B) and/or trailing (-A)
57 //config: context surrounding our matching lines.
58 //config: Print the specified number of context lines (-C).
65 //usage:#define grep_trivial_usage
66 //usage: "[-HhnlLoqvsriw"
68 //usage: IF_FEATURE_GREP_EGREP_ALIAS("E")
69 //usage: IF_EXTRA_COMPAT("z")
71 //usage: IF_FEATURE_GREP_CONTEXT("[-A/B/C N] ")
72 //usage: "PATTERN/-e PATTERN.../-f FILE [FILE]..."
73 //usage:#define grep_full_usage "\n\n"
74 //usage: "Search for PATTERN in FILEs (or stdin)\n"
75 //usage: "\n -H Add 'filename:' prefix"
76 //usage: "\n -h Do not add 'filename:' prefix"
77 //usage: "\n -n Add 'line_no:' prefix"
78 //usage: "\n -l Show only names of files that match"
79 //usage: "\n -L Show only names of files that don't match"
80 //usage: "\n -c Show only count of matching lines"
81 //usage: "\n -o Show only the matching part of line"
82 //usage: "\n -q Quiet. Return 0 if PATTERN is found, 1 otherwise"
83 //usage: "\n -v Select non-matching lines"
84 //usage: "\n -s Suppress open and read errors"
85 //usage: "\n -r Recurse"
86 //usage: "\n -i Ignore case"
87 //usage: "\n -w Match whole words only"
88 //usage: "\n -x Match whole lines only"
89 //usage: "\n -F PATTERN is a literal (not regexp)"
90 //usage: IF_FEATURE_GREP_EGREP_ALIAS(
91 //usage: "\n -E PATTERN is an extended regexp"
93 //usage: IF_EXTRA_COMPAT(
94 //usage: "\n -z Input is NUL terminated"
96 //usage: "\n -m N Match up to N times per file"
97 //usage: IF_FEATURE_GREP_CONTEXT(
98 //usage: "\n -A N Print N lines of trailing context"
99 //usage: "\n -B N Print N lines of leading context"
100 //usage: "\n -C N Same as '-A N -B N'"
102 //usage: "\n -e PTRN Pattern to match"
103 //usage: "\n -f FILE Read pattern from file"
105 //usage:#define grep_example_usage
106 //usage: "$ grep root /etc/passwd\n"
107 //usage: "root:x:0:0:root:/root:/bin/bash\n"
108 //usage: "$ grep ^[rR]oo. /etc/passwd\n"
109 //usage: "root:x:0:0:root:/root:/bin/bash\n"
111 //usage:#define egrep_trivial_usage NOUSAGE_STR
112 //usage:#define egrep_full_usage ""
113 //usage:#define fgrep_trivial_usage NOUSAGE_STR
114 //usage:#define fgrep_full_usage ""
116 #define OPTSTR_GREP \
117 "lnqvscFiHhe:f:Lorm:wx" \
118 IF_FEATURE_GREP_CONTEXT("A:B:C:") \
119 IF_FEATURE_GREP_EGREP_ALIAS("E") \
120 IF_EXTRA_COMPAT("z") \
122 /* ignored: -a "assume all files to be text" */
123 /* ignored: -I "assume binary files have no matches" */
125 OPTBIT_l, /* list matched file names only */
126 OPTBIT_n, /* print line# */
127 OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */
128 OPTBIT_v, /* invert the match, to select non-matching lines */
129 OPTBIT_s, /* suppress errors about file open errors */
130 OPTBIT_c, /* count matches per file (suppresses normal output) */
131 OPTBIT_F, /* literal match */
132 OPTBIT_i, /* case-insensitive */
133 OPTBIT_H, /* force filename display */
134 OPTBIT_h, /* inhibit filename display */
135 OPTBIT_e, /* -e PATTERN */
136 OPTBIT_f, /* -f FILE_WITH_PATTERNS */
137 OPTBIT_L, /* list unmatched file names only */
138 OPTBIT_o, /* show only matching parts of lines */
139 OPTBIT_r, /* recurse dirs */
140 OPTBIT_m, /* -m MAX_MATCHES */
141 OPTBIT_w, /* -w whole word match */
142 OPTBIT_x, /* -x whole line match */
143 IF_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */
144 IF_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */
145 IF_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */
146 IF_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */
147 IF_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */
148 OPT_l = 1 << OPTBIT_l,
149 OPT_n = 1 << OPTBIT_n,
150 OPT_q = 1 << OPTBIT_q,
151 OPT_v = 1 << OPTBIT_v,
152 OPT_s = 1 << OPTBIT_s,
153 OPT_c = 1 << OPTBIT_c,
154 OPT_F = 1 << OPTBIT_F,
155 OPT_i = 1 << OPTBIT_i,
156 OPT_H = 1 << OPTBIT_H,
157 OPT_h = 1 << OPTBIT_h,
158 OPT_e = 1 << OPTBIT_e,
159 OPT_f = 1 << OPTBIT_f,
160 OPT_L = 1 << OPTBIT_L,
161 OPT_o = 1 << OPTBIT_o,
162 OPT_r = 1 << OPTBIT_r,
163 OPT_m = 1 << OPTBIT_m,
164 OPT_w = 1 << OPTBIT_w,
165 OPT_x = 1 << OPTBIT_x,
166 OPT_A = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0,
167 OPT_B = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0,
168 OPT_C = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0,
169 OPT_E = IF_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0,
170 OPT_z = IF_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0,
173 #define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l)
174 #define PRINT_LINE_NUM (option_mask32 & OPT_n)
175 #define BE_QUIET (option_mask32 & OPT_q)
176 #define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s)
177 #define PRINT_MATCH_COUNTS (option_mask32 & OPT_c)
178 #define FGREP_FLAG (option_mask32 & OPT_F)
179 #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
180 #define NUL_DELIMITED (option_mask32 & OPT_z)
184 #if !ENABLE_EXTRA_COMPAT
187 RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */
189 smalluint invert_search;
190 smalluint print_filename;
191 smalluint open_errors;
192 #if ENABLE_FEATURE_GREP_CONTEXT
193 smalluint did_print_line;
197 IF_EXTRA_COMPAT(size_t *before_buf_size;)
198 int last_line_printed;
200 /* globals used internally */
201 llist_t *pattern_head; /* growable list of patterns to match */
202 const char *cur_file; /* the current file we are reading */
204 #define G (*(struct globals*)&bb_common_bufsiz1)
205 #define INIT_G() do { \
206 struct G_sizecheck { \
207 char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
210 #define max_matches (G.max_matches )
211 #if !ENABLE_EXTRA_COMPAT
212 # define reflags (G.reflags )
214 # define case_fold (G.case_fold )
215 /* http://www.delorie.com/gnu/docs/regex/regex_46.html */
216 # define reflags re_syntax_options
220 # define REG_NOSUB bug:is:here /* should not be used */
221 /* Just RE_SYNTAX_EGREP is not enough, need to enable {n[,[m]]} too */
222 # define REG_EXTENDED (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES)
223 # define REG_ICASE bug:is:here /* should not be used */
225 #define invert_search (G.invert_search )
226 #define print_filename (G.print_filename )
227 #define open_errors (G.open_errors )
228 #define did_print_line (G.did_print_line )
229 #define lines_before (G.lines_before )
230 #define lines_after (G.lines_after )
231 #define before_buf (G.before_buf )
232 #define before_buf_size (G.before_buf_size )
233 #define last_line_printed (G.last_line_printed )
234 #define pattern_head (G.pattern_head )
235 #define cur_file (G.cur_file )
238 typedef struct grep_list_data_t {
240 /* for GNU regex, matched_range must be persistent across grep_file() calls */
241 #if !ENABLE_EXTRA_COMPAT
242 regex_t compiled_regex;
243 regmatch_t matched_range;
245 struct re_pattern_buffer compiled_regex;
246 struct re_registers matched_range;
250 int flg_mem_alocated_compiled;
253 #if !ENABLE_EXTRA_COMPAT
254 #define print_line(line, line_len, linenum, decoration) \
255 print_line(line, linenum, decoration)
257 static void print_line(const char *line, size_t line_len, int linenum, char decoration)
259 #if ENABLE_FEATURE_GREP_CONTEXT
260 /* Happens when we go to next file, immediately hit match
261 * and try to print prev context... from prev file! Don't do it */
264 /* possibly print the little '--' separator */
265 if ((lines_before || lines_after) && did_print_line
266 && last_line_printed != linenum - 1
270 /* guard against printing "--" before first line of first file */
272 last_line_printed = linenum;
275 printf("%s%c", cur_file, decoration);
277 printf("%i%c", linenum, decoration);
278 /* Emulate weird GNU grep behavior with -ov */
279 if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o)) {
280 #if !ENABLE_EXTRA_COMPAT
283 fwrite(line, 1, line_len, stdout);
284 putchar(NUL_DELIMITED ? '\0' : '\n');
289 #if ENABLE_EXTRA_COMPAT
290 /* Unlike getline, this one removes trailing '\n' */
291 static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file)
295 int delim = (NUL_DELIMITED ? '\0' : '\n');
297 res_sz = getdelim(line_ptr, line_alloc_len, delim, file);
301 if (line[res_sz - 1] == delim)
302 line[--res_sz] = '\0';
304 free(line); /* uclibc allocates a buffer even on EOF. WTF? */
310 static int grep_file(FILE *file)
315 #if !ENABLE_EXTRA_COMPAT
320 size_t line_alloc_len;
321 # define rm_so start[0]
322 # define rm_eo end[0]
324 #if ENABLE_FEATURE_GREP_CONTEXT
325 int print_n_lines_after = 0;
326 int curpos = 0; /* track where we are in the circular 'before' buffer */
327 int idx = 0; /* used for iteration through the circular buffer */
329 enum { print_n_lines_after = 0 };
333 #if !ENABLE_EXTRA_COMPAT
334 (line = xmalloc_fgetline(file)) != NULL
336 (line_len = bb_getline(&line, &line_alloc_len, file)) >= 0
339 llist_t *pattern_ptr = pattern_head;
340 grep_list_data_t *gl = gl; /* for gcc */
344 while (pattern_ptr) {
345 gl = (grep_list_data_t *)pattern_ptr->data;
350 match = ((option_mask32 & OPT_i)
351 ? strcasestr(str, gl->pattern)
352 : strstr(str, gl->pattern)
355 if (option_mask32 & OPT_x) {
357 goto opt_f_not_found;
358 if (str[strlen(gl->pattern)] != '\0')
359 goto opt_f_not_found;
361 if (option_mask32 & OPT_w) {
362 char c = (match != str) ? match[-1] : ' ';
363 if (!isalnum(c) && c != '_') {
364 c = match[strlen(gl->pattern)];
365 if (!c || (!isalnum(c) && c != '_'))
378 if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
379 gl->flg_mem_alocated_compiled |= COMPILED;
380 #if !ENABLE_EXTRA_COMPAT
381 xregcomp(&gl->compiled_regex, gl->pattern, reflags);
383 memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
384 gl->compiled_regex.translate = case_fold; /* for -i */
385 if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
386 bb_error_msg_and_die("bad regex '%s'", gl->pattern);
389 #if !ENABLE_EXTRA_COMPAT
390 gl->matched_range.rm_so = 0;
391 gl->matched_range.rm_eo = 0;
396 #if !ENABLE_EXTRA_COMPAT
397 regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, 0) == 0
399 re_search(&gl->compiled_regex, match_at, line_len,
400 /*start:*/ 0, /*range:*/ line_len,
401 &gl->matched_range) >= 0
404 if (option_mask32 & OPT_x) {
405 found = (gl->matched_range.rm_so == 0
406 && match_at[gl->matched_range.rm_eo] == '\0');
408 if (!(option_mask32 & OPT_w)) {
412 if (gl->matched_range.rm_so)
413 c = match_at[gl->matched_range.rm_so - 1];
414 if (!isalnum(c) && c != '_') {
415 c = match_at[gl->matched_range.rm_eo];
416 if (!c || (!isalnum(c) && c != '_')) {
419 match_at += gl->matched_range.rm_eo;
426 /* If it's non-inverted search, we can stop
428 if (found && !invert_search)
430 pattern_ptr = pattern_ptr->link;
431 } /* while (pattern_ptr) */
433 if (found ^ invert_search) {
435 /* keep track of matches */
438 /* quiet/print (non)matching file names only? */
439 if (option_mask32 & (OPT_q|OPT_l|OPT_L)) {
440 free(line); /* we don't need line anymore */
442 /* manpage says about -q:
443 * "exit immediately with zero status
444 * if any match is found,
445 * even if errors were detected" */
448 /* if we're just printing filenames, we stop after the first match */
449 if (PRINT_FILES_WITH_MATCHES) {
451 /* fall through to "return 1" */
453 /* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
454 return 1; /* one match */
457 #if ENABLE_FEATURE_GREP_CONTEXT
458 /* Were we printing context and saw next (unwanted) match? */
459 if ((option_mask32 & OPT_m) && nmatches > max_matches)
463 /* print the matched line */
464 if (PRINT_MATCH_COUNTS == 0) {
465 #if ENABLE_FEATURE_GREP_CONTEXT
466 int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
468 /* if we were told to print 'before' lines and there is at least
469 * one line in the circular buffer, print them */
470 if (lines_before && before_buf[prevpos] != NULL) {
471 int first_buf_entry_line_num = linenum - lines_before;
473 /* advance to the first entry in the circular buffer, and
474 * figure out the line number is of the first line in the
477 while (before_buf[idx] == NULL) {
478 idx = (idx + 1) % lines_before;
479 first_buf_entry_line_num++;
482 /* now print each line in the buffer, clearing them as we go */
483 while (before_buf[idx] != NULL) {
484 print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-');
485 free(before_buf[idx]);
486 before_buf[idx] = NULL;
487 idx = (idx + 1) % lines_before;
488 first_buf_entry_line_num++;
492 /* make a note that we need to print 'after' lines */
493 print_n_lines_after = lines_after;
495 if (option_mask32 & OPT_o) {
497 /* -Fo just prints the pattern
498 * (unless -v: -Fov doesnt print anything at all) */
500 print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
502 unsigned start = gl->matched_range.rm_so;
503 unsigned end = gl->matched_range.rm_eo;
504 unsigned len = end - start;
505 char old = line[end];
507 /* Empty match is not printed: try "echo test | grep -o ''" */
509 print_line(line + start, len, linenum, ':');
515 #if !ENABLE_EXTRA_COMPAT
516 if (regexec(&gl->compiled_regex, line + end,
517 1, &gl->matched_range, REG_NOTBOL) != 0)
519 gl->matched_range.rm_so += end;
520 gl->matched_range.rm_eo += end;
522 if (re_search(&gl->compiled_regex, line, line_len,
524 &gl->matched_range) < 0)
529 print_line(line, line_len, linenum, ':');
533 #if ENABLE_FEATURE_GREP_CONTEXT
534 else { /* no match */
535 /* if we need to print some context lines after the last match, do so */
536 if (print_n_lines_after) {
537 print_line(line, strlen(line), linenum, '-');
538 print_n_lines_after--;
539 } else if (lines_before) {
540 /* Add the line to the circular 'before' buffer */
541 free(before_buf[curpos]);
542 before_buf[curpos] = line;
543 IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
544 curpos = (curpos + 1) % lines_before;
545 /* avoid free(line) - we took the line */
550 #endif /* ENABLE_FEATURE_GREP_CONTEXT */
551 #if !ENABLE_EXTRA_COMPAT
554 /* Did we print all context after last requested match? */
555 if ((option_mask32 & OPT_m)
556 && !print_n_lines_after
557 && nmatches == max_matches
561 } /* while (read line) */
563 /* special-case file post-processing for options where we don't print line
564 * matches, just filenames and possibly match counts */
566 /* grep -c: print [filename:]count, even if count is zero */
567 if (PRINT_MATCH_COUNTS) {
569 printf("%s:", cur_file);
570 printf("%d\n", nmatches);
573 /* grep -L: print just the filename */
574 if (PRINT_FILES_WITHOUT_MATCHES) {
575 /* nmatches is zero, no need to check it:
576 * we return 1 early if we detected a match
577 * and PRINT_FILES_WITHOUT_MATCHES is set */
584 #if ENABLE_FEATURE_CLEAN_UP
585 #define new_grep_list_data(p, m) add_grep_list_data(p, m)
586 static char *add_grep_list_data(char *pattern, int flg_used_mem)
588 #define new_grep_list_data(p, m) add_grep_list_data(p)
589 static char *add_grep_list_data(char *pattern)
592 grep_list_data_t *gl = xzalloc(sizeof(*gl));
593 gl->pattern = pattern;
594 #if ENABLE_FEATURE_CLEAN_UP
595 gl->flg_mem_alocated_compiled = flg_used_mem;
597 /*gl->flg_mem_alocated_compiled = 0;*/
602 static void load_regexes_from_file(llist_t *fopt)
608 char *ffile = cur->data;
612 fp = xfopen_stdin(ffile);
613 while ((line = xmalloc_fgetline(fp)) != NULL) {
614 llist_add_to(&pattern_head,
615 new_grep_list_data(line, ALLOCATED));
617 fclose_if_not_stdin(fp);
621 static int FAST_FUNC file_action_grep(const char *filename,
622 struct stat *statbuf UNUSED_PARAM,
624 int depth UNUSED_PARAM)
626 FILE *file = fopen_for_read(filename);
628 if (!SUPPRESS_ERR_MSGS)
629 bb_simple_perror_msg(filename);
634 *(int*)matched += grep_file(file);
639 static int grep_dir(const char *dir)
642 recursive_action(dir,
643 /* recurse=yes */ ACTION_RECURSE |
645 /* depthFirst=yes */ ACTION_DEPTHFIRST,
646 /* fileAction= */ file_action_grep,
647 /* dirAction= */ NULL,
648 /* userData= */ &matched,
653 int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
654 int grep_main(int argc UNUSED_PARAM, char **argv)
658 llist_t *fopt = NULL;
660 /* do normal option parsing */
661 #if ENABLE_FEATURE_GREP_CONTEXT
664 /* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
665 * -m,-A,-B,-C have numeric param */
666 opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
667 opts = getopt32(argv,
669 &pattern_head, &fopt, &max_matches,
670 &lines_after, &lines_before, &Copt);
673 /* -C unsets prev -A and -B, but following -A or -B
675 if (!(opts & OPT_A)) /* not overridden */
677 if (!(opts & OPT_B)) /* not overridden */
681 if (opts & (OPT_c|OPT_q|OPT_l|OPT_L)) {
682 option_mask32 &= ~OPT_n;
685 } else if (lines_before > 0) {
686 if (lines_before > INT_MAX / sizeof(long long))
687 lines_before = INT_MAX / sizeof(long long);
688 /* overflow in (lines_before * sizeof(x)) is prevented (above) */
689 before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
690 IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
693 /* with auto sanity checks */
694 /* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
695 opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+";
696 getopt32(argv, OPTSTR_GREP,
697 &pattern_head, &fopt, &max_matches);
699 invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
701 { /* convert char **argv to grep_list_data_t */
703 for (cur = pattern_head; cur; cur = cur->link)
704 cur->data = new_grep_list_data(cur->data, 0);
706 if (option_mask32 & OPT_f) {
707 load_regexes_from_file(fopt);
708 if (!pattern_head) { /* -f EMPTY_FILE? */
709 /* GNU grep treats it as "nothing matches" */
710 llist_add_to(&pattern_head, new_grep_list_data((char*) "", 0));
715 if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
716 option_mask32 |= OPT_F;
718 #if !ENABLE_EXTRA_COMPAT
719 if (!(option_mask32 & (OPT_o | OPT_w | OPT_x)))
723 if (ENABLE_FEATURE_GREP_EGREP_ALIAS
724 && (applet_name[0] == 'e' || (option_mask32 & OPT_E))
726 reflags |= REG_EXTENDED;
728 #if ENABLE_EXTRA_COMPAT
730 reflags = RE_SYNTAX_GREP;
734 if (option_mask32 & OPT_i) {
735 #if !ENABLE_EXTRA_COMPAT
736 reflags |= REG_ICASE;
739 case_fold = xmalloc(256);
740 for (i = 0; i < 256; i++)
741 case_fold[i] = (unsigned char)i;
742 for (i = 'a'; i <= 'z'; i++)
743 case_fold[i] = (unsigned char)(i - ('a' - 'A'));
749 /* if we didn't get a pattern from -e and no command file was specified,
750 * first parameter should be the pattern. no pattern, no worky */
751 if (pattern_head == NULL) {
755 pattern = new_grep_list_data(*argv++, 0);
756 llist_add_to(&pattern_head, pattern);
759 /* argv[0..(argc-1)] should be names of file to grep through. If
760 * there is more than one file to grep, we will print the filenames. */
761 if (argv[0] && argv[1])
763 /* -H / -h of course override */
764 if (option_mask32 & OPT_H)
766 if (option_mask32 & OPT_h)
769 /* If no files were specified, or '-' was specified, take input from
770 * stdin. Otherwise, we grep through all the files specified. */
775 if (!cur_file || LONE_DASH(cur_file)) {
776 cur_file = "(standard input)";
778 if (option_mask32 & OPT_r) {
780 if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
781 if (!(option_mask32 & OPT_h))
783 matched += grep_dir(cur_file);
787 /* else: fopen(dir) will succeed, but reading won't */
788 file = fopen_for_read(cur_file);
790 if (!SUPPRESS_ERR_MSGS)
791 bb_simple_perror_msg(cur_file);
796 matched += grep_file(file);
797 fclose_if_not_stdin(file);
799 } while (*argv && *++argv);
801 /* destroy all the elments in the pattern list */
802 if (ENABLE_FEATURE_CLEAN_UP) {
803 while (pattern_head) {
804 llist_t *pattern_head_ptr = pattern_head;
805 grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data;
807 pattern_head = pattern_head->link;
808 if (gl->flg_mem_alocated_compiled & ALLOCATED)
810 if (gl->flg_mem_alocated_compiled & COMPILED)
811 regfree(&gl->compiled_regex);
813 free(pattern_head_ptr);
816 /* 0 = success, 1 = failed, 2 = error */
819 return !matched; /* invert return value: 0 = success, 1 = failed */