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 (8.6 kb)"
24
//config: grep is used to search files for a specified pattern.
27
//config: bool "egrep (7.8 kb)"
30
//config: Alias to "grep -E".
33
//config: bool "fgrep (7.8 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 \
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"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;
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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 = getopt32long(argv, "^"
711
"color\0" Optional_argument "\xff",
712
&pattern_head, &fopt, &max_matches,
713
&lines_after, &lines_before, &Copt
718
/* -C unsets prev -A and -B, but following -A or -B
720
if (!(opts & OPT_A)) /* not overridden */
722
if (!(opts & OPT_B)) /* not overridden */
726
if (opts & (OPT_c|OPT_q|OPT_l|OPT_L)) {
727
option_mask32 &= ~OPT_n;
730
} else if (lines_before > 0) {
731
if (lines_before > INT_MAX / sizeof(long long))
732
lines_before = INT_MAX / sizeof(long long);
733
/* overflow in (lines_before * sizeof(x)) is prevented (above) */
734
before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
735
IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
738
/* with auto sanity checks */
739
getopt32(argv, "^" OPTSTR_GREP "\0" "H-h:c-n:q-n:l-n:", // why trailing ":"?
740
&pattern_head, &fopt, &max_matches);
742
invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
744
{ /* convert char **argv to grep_list_data_t */
746
for (cur = pattern_head; cur; cur = cur->link)
747
cur->data = new_grep_list_data(cur->data, 0);
749
if (option_mask32 & OPT_f) {
750
load_regexes_from_file(fopt);
751
if (!pattern_head) { /* -f EMPTY_FILE? */
752
/* GNU grep treats it as "nothing matches" */
753
llist_add_to(&pattern_head, new_grep_list_data((char*) "", 0));
758
if (ENABLE_FGREP && applet_name[0] == 'f')
759
option_mask32 |= OPT_F;
761
#if !ENABLE_EXTRA_COMPAT
762
if (!(option_mask32 & (OPT_o | OPT_w | OPT_x)))
766
if ((ENABLE_EGREP && applet_name[0] == 'e')
767
|| (option_mask32 & OPT_E)
769
reflags |= REG_EXTENDED;
771
#if ENABLE_EXTRA_COMPAT
773
reflags = RE_SYNTAX_GREP;
777
if (option_mask32 & OPT_i) {
778
#if !ENABLE_EXTRA_COMPAT
779
reflags |= REG_ICASE;
782
case_fold = xmalloc(256);
783
for (i = 0; i < 256; i++)
784
case_fold[i] = (unsigned char)i;
785
for (i = 'a'; i <= 'z'; i++)
786
case_fold[i] = (unsigned char)(i - ('a' - 'A'));
792
/* if we didn't get a pattern from -e and no command file was specified,
793
* first parameter should be the pattern. no pattern, no worky */
794
if (pattern_head == NULL) {
798
pattern = new_grep_list_data(*argv++, 0);
799
llist_add_to(&pattern_head, pattern);
802
/* argv[0..(argc-1)] should be names of file to grep through. If
803
* there is more than one file to grep, we will print the filenames. */
804
if (argv[0] && argv[1])
806
/* -H / -h of course override */
807
if (option_mask32 & OPT_H)
809
if (option_mask32 & OPT_h)
812
/* If no files were specified, or '-' was specified, take input from
813
* stdin. Otherwise, we grep through all the files specified. */
818
if (!cur_file || LONE_DASH(cur_file)) {
819
cur_file = "(standard input)";
821
if (option_mask32 & OPT_r) {
823
if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
824
if (!(option_mask32 & OPT_h))
826
matched += grep_dir(cur_file);
830
/* else: fopen(dir) will succeed, but reading won't */
831
file = fopen_for_read(cur_file);
833
if (!SUPPRESS_ERR_MSGS)
834
bb_simple_perror_msg(cur_file);
839
matched += grep_file(file);
840
fclose_if_not_stdin(file);
842
} while (*argv && *++argv);
844
/* destroy all the elements in the pattern list */
845
if (ENABLE_FEATURE_CLEAN_UP) {
846
while (pattern_head) {
847
llist_t *pattern_head_ptr = pattern_head;
848
grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data;
850
pattern_head = pattern_head->link;
851
if (gl->flg_mem_allocated_compiled & ALLOCATED)
853
if (gl->flg_mem_allocated_compiled & COMPILED)
854
regfree(&gl->compiled_regex);
856
free(pattern_head_ptr);
859
/* 0 = success, 1 = failed, 2 = error */
862
return !matched; /* invert return value: 0 = success, 1 = failed */
added
removed
findutils/grep.c
