source: MondoRescue/branches/3.3/mindi-busybox/findutils/grep.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 25.2 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini grep implementation for busybox using libc regex.
4 *
5 * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
6 * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9 */
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 */
13/*
14 * 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> -
15 * correction "-e pattern1 -e pattern2" logic and more optimizations.
16 * precompiled regex
17 *
18 * (C) 2006 Jac Goudsmit added -o option
19 */
20
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))
24
25//kbuild:lib-$(CONFIG_GREP) += grep.o
26
27//config:config GREP
28//config: bool "grep"
29//config: default y
30//config: help
31//config: grep is used to search files for a specified pattern.
32//config:
33//config:config FEATURE_GREP_EGREP_ALIAS
34//config: bool "Enable extended regular expressions (egrep & grep -E)"
35//config: default y
36//config: depends on GREP
37//config: help
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.
41//config:
42//config:config FEATURE_GREP_FGREP_ALIAS
43//config: bool "Alias fgrep to grep -F"
44//config: default y
45//config: depends on GREP
46//config: help
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.
50//config:
51//config:config FEATURE_GREP_CONTEXT
52//config: bool "Enable before and after context flags (-A, -B and -C)"
53//config: default y
54//config: depends on GREP
55//config: help
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).
59
60#include "libbb.h"
61#include "common_bufsiz.h"
62#include "xregex.h"
63
64
65/* options */
66//usage:#define grep_trivial_usage
67//usage: "[-HhnlLoqvsriw"
68//usage: "F"
69//usage: IF_FEATURE_GREP_EGREP_ALIAS("E")
70//usage: IF_EXTRA_COMPAT("z")
71//usage: "] [-m N] "
72//usage: IF_FEATURE_GREP_CONTEXT("[-A/B/C N] ")
73//usage: "PATTERN/-e PATTERN.../-f FILE [FILE]..."
74//usage:#define grep_full_usage "\n\n"
75//usage: "Search for PATTERN in FILEs (or stdin)\n"
76//usage: "\n -H Add 'filename:' prefix"
77//usage: "\n -h Do not add 'filename:' prefix"
78//usage: "\n -n Add 'line_no:' prefix"
79//usage: "\n -l Show only names of files that match"
80//usage: "\n -L Show only names of files that don't match"
81//usage: "\n -c Show only count of matching lines"
82//usage: "\n -o Show only the matching part of line"
83//usage: "\n -q Quiet. Return 0 if PATTERN is found, 1 otherwise"
84//usage: "\n -v Select non-matching lines"
85//usage: "\n -s Suppress open and read errors"
86//usage: "\n -r Recurse"
87//usage: "\n -i Ignore case"
88//usage: "\n -w Match whole words only"
89//usage: "\n -x Match whole lines only"
90//usage: "\n -F PATTERN is a literal (not regexp)"
91//usage: IF_FEATURE_GREP_EGREP_ALIAS(
92//usage: "\n -E PATTERN is an extended regexp"
93//usage: )
94//usage: IF_EXTRA_COMPAT(
95//usage: "\n -z Input is NUL terminated"
96//usage: )
97//usage: "\n -m N Match up to N times per file"
98//usage: IF_FEATURE_GREP_CONTEXT(
99//usage: "\n -A N Print N lines of trailing context"
100//usage: "\n -B N Print N lines of leading context"
101//usage: "\n -C N Same as '-A N -B N'"
102//usage: )
103//usage: "\n -e PTRN Pattern to match"
104//usage: "\n -f FILE Read pattern from file"
105//usage:
106//usage:#define grep_example_usage
107//usage: "$ grep root /etc/passwd\n"
108//usage: "root:x:0:0:root:/root:/bin/bash\n"
109//usage: "$ grep ^[rR]oo. /etc/passwd\n"
110//usage: "root:x:0:0:root:/root:/bin/bash\n"
111//usage:
112//usage:#define egrep_trivial_usage NOUSAGE_STR
113//usage:#define egrep_full_usage ""
114//usage:#define fgrep_trivial_usage NOUSAGE_STR
115//usage:#define fgrep_full_usage ""
116
117#define OPTSTR_GREP \
118 "lnqvscFiHhe:f:Lorm:wx" \
119 IF_FEATURE_GREP_CONTEXT("A:B:C:") \
120 IF_FEATURE_GREP_EGREP_ALIAS("E") \
121 IF_EXTRA_COMPAT("z") \
122 "aI"
123/* ignored: -a "assume all files to be text" */
124/* ignored: -I "assume binary files have no matches" */
125enum {
126 OPTBIT_l, /* list matched file names only */
127 OPTBIT_n, /* print line# */
128 OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */
129 OPTBIT_v, /* invert the match, to select non-matching lines */
130 OPTBIT_s, /* suppress errors about file open errors */
131 OPTBIT_c, /* count matches per file (suppresses normal output) */
132 OPTBIT_F, /* literal match */
133 OPTBIT_i, /* case-insensitive */
134 OPTBIT_H, /* force filename display */
135 OPTBIT_h, /* inhibit filename display */
136 OPTBIT_e, /* -e PATTERN */
137 OPTBIT_f, /* -f FILE_WITH_PATTERNS */
138 OPTBIT_L, /* list unmatched file names only */
139 OPTBIT_o, /* show only matching parts of lines */
140 OPTBIT_r, /* recurse dirs */
141 OPTBIT_m, /* -m MAX_MATCHES */
142 OPTBIT_w, /* -w whole word match */
143 OPTBIT_x, /* -x whole line match */
144 IF_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */
145 IF_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */
146 IF_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */
147 IF_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */
148 IF_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */
149 OPT_l = 1 << OPTBIT_l,
150 OPT_n = 1 << OPTBIT_n,
151 OPT_q = 1 << OPTBIT_q,
152 OPT_v = 1 << OPTBIT_v,
153 OPT_s = 1 << OPTBIT_s,
154 OPT_c = 1 << OPTBIT_c,
155 OPT_F = 1 << OPTBIT_F,
156 OPT_i = 1 << OPTBIT_i,
157 OPT_H = 1 << OPTBIT_H,
158 OPT_h = 1 << OPTBIT_h,
159 OPT_e = 1 << OPTBIT_e,
160 OPT_f = 1 << OPTBIT_f,
161 OPT_L = 1 << OPTBIT_L,
162 OPT_o = 1 << OPTBIT_o,
163 OPT_r = 1 << OPTBIT_r,
164 OPT_m = 1 << OPTBIT_m,
165 OPT_w = 1 << OPTBIT_w,
166 OPT_x = 1 << OPTBIT_x,
167 OPT_A = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0,
168 OPT_B = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0,
169 OPT_C = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0,
170 OPT_E = IF_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0,
171 OPT_z = IF_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0,
172};
173
174#define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l)
175#define PRINT_LINE_NUM (option_mask32 & OPT_n)
176#define BE_QUIET (option_mask32 & OPT_q)
177#define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s)
178#define PRINT_MATCH_COUNTS (option_mask32 & OPT_c)
179#define FGREP_FLAG (option_mask32 & OPT_F)
180#define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
181#define NUL_DELIMITED (option_mask32 & OPT_z)
182
183struct globals {
184 int max_matches;
185#if !ENABLE_EXTRA_COMPAT
186 int reflags;
187#else
188 RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */
189#endif
190 smalluint invert_search;
191 smalluint print_filename;
192 smalluint open_errors;
193#if ENABLE_FEATURE_GREP_CONTEXT
194 smalluint did_print_line;
195 int lines_before;
196 int lines_after;
197 char **before_buf;
198 IF_EXTRA_COMPAT(size_t *before_buf_size;)
199 int last_line_printed;
200#endif
201 /* globals used internally */
202 llist_t *pattern_head; /* growable list of patterns to match */
203 const char *cur_file; /* the current file we are reading */
204} FIX_ALIASING;
205#define G (*(struct globals*)bb_common_bufsiz1)
206#define INIT_G() do { \
207 setup_common_bufsiz(); \
208 BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
209} while (0)
210#define max_matches (G.max_matches )
211#if !ENABLE_EXTRA_COMPAT
212# define reflags (G.reflags )
213#else
214# define case_fold (G.case_fold )
215/* http://www.delorie.com/gnu/docs/regex/regex_46.html */
216# define reflags re_syntax_options
217# undef REG_NOSUB
218# undef REG_EXTENDED
219# undef REG_ICASE
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 */
224#endif
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 )
236
237
238typedef struct grep_list_data_t {
239 char *pattern;
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;
244#else
245 struct re_pattern_buffer compiled_regex;
246 struct re_registers matched_range;
247#endif
248#define ALLOCATED 1
249#define COMPILED 2
250 int flg_mem_alocated_compiled;
251} grep_list_data_t;
252
253#if !ENABLE_EXTRA_COMPAT
254#define print_line(line, line_len, linenum, decoration) \
255 print_line(line, linenum, decoration)
256#endif
257static void print_line(const char *line, size_t line_len, int linenum, char decoration)
258{
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 */
262 if (linenum < 1)
263 return;
264 /* possibly print the little '--' separator */
265 if ((lines_before || lines_after) && did_print_line
266 && last_line_printed != linenum - 1
267 ) {
268 puts("--");
269 }
270 /* guard against printing "--" before first line of first file */
271 did_print_line = 1;
272 last_line_printed = linenum;
273#endif
274 if (print_filename)
275 printf("%s%c", cur_file, decoration);
276 if (PRINT_LINE_NUM)
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
281 puts(line);
282#else
283 fwrite(line, 1, line_len, stdout);
284 putchar(NUL_DELIMITED ? '\0' : '\n');
285#endif
286 }
287}
288
289#if ENABLE_EXTRA_COMPAT
290/* Unlike getline, this one removes trailing '\n' */
291static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file)
292{
293 ssize_t res_sz;
294 char *line;
295 int delim = (NUL_DELIMITED ? '\0' : '\n');
296
297 res_sz = getdelim(line_ptr, line_alloc_len, delim, file);
298 line = *line_ptr;
299
300 if (res_sz > 0) {
301 if (line[res_sz - 1] == delim)
302 line[--res_sz] = '\0';
303 } else {
304 free(line); /* uclibc allocates a buffer even on EOF. WTF? */
305 }
306 return res_sz;
307}
308#endif
309
310static int grep_file(FILE *file)
311{
312 smalluint found;
313 int linenum = 0;
314 int nmatches = 0;
315#if !ENABLE_EXTRA_COMPAT
316 char *line;
317#else
318 char *line = NULL;
319 ssize_t line_len;
320 size_t line_alloc_len;
321# define rm_so start[0]
322# define rm_eo end[0]
323#endif
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 */
328#else
329 enum { print_n_lines_after = 0 };
330#endif
331
332 while (
333#if !ENABLE_EXTRA_COMPAT
334 (line = xmalloc_fgetline(file)) != NULL
335#else
336 (line_len = bb_getline(&line, &line_alloc_len, file)) >= 0
337#endif
338 ) {
339 llist_t *pattern_ptr = pattern_head;
340 grep_list_data_t *gl = gl; /* for gcc */
341
342 linenum++;
343 found = 0;
344 while (pattern_ptr) {
345 gl = (grep_list_data_t *)pattern_ptr->data;
346 if (FGREP_FLAG) {
347 char *match;
348 char *str = line;
349 opt_f_again:
350 match = ((option_mask32 & OPT_i)
351 ? strcasestr(str, gl->pattern)
352 : strstr(str, gl->pattern)
353 );
354 if (match) {
355 if (option_mask32 & OPT_x) {
356 if (match != str)
357 goto opt_f_not_found;
358 if (str[strlen(gl->pattern)] != '\0')
359 goto opt_f_not_found;
360 } else
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 != '_'))
366 goto opt_f_found;
367 }
368 str = match + 1;
369 goto opt_f_again;
370 }
371 opt_f_found:
372 found = 1;
373 opt_f_not_found: ;
374 }
375 } else {
376#if ENABLE_EXTRA_COMPAT
377 unsigned start_pos;
378#else
379 int match_flg;
380#endif
381 char *match_at;
382
383 if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
384 gl->flg_mem_alocated_compiled |= COMPILED;
385#if !ENABLE_EXTRA_COMPAT
386 xregcomp(&gl->compiled_regex, gl->pattern, reflags);
387#else
388 memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
389 gl->compiled_regex.translate = case_fold; /* for -i */
390 if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
391 bb_error_msg_and_die("bad regex '%s'", gl->pattern);
392#endif
393 }
394#if !ENABLE_EXTRA_COMPAT
395 gl->matched_range.rm_so = 0;
396 gl->matched_range.rm_eo = 0;
397 match_flg = 0;
398#else
399 start_pos = 0;
400#endif
401 match_at = line;
402 opt_w_again:
403//bb_error_msg("'%s' start_pos:%d line_len:%d", match_at, start_pos, line_len);
404 if (
405#if !ENABLE_EXTRA_COMPAT
406 regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, match_flg) == 0
407#else
408 re_search(&gl->compiled_regex, match_at, line_len,
409 start_pos, /*range:*/ line_len,
410 &gl->matched_range) >= 0
411#endif
412 ) {
413 if (option_mask32 & OPT_x) {
414 found = (gl->matched_range.rm_so == 0
415 && match_at[gl->matched_range.rm_eo] == '\0');
416 } else
417 if (!(option_mask32 & OPT_w)) {
418 found = 1;
419 } else {
420 char c = ' ';
421 if (match_at > line || gl->matched_range.rm_so != 0) {
422 c = match_at[gl->matched_range.rm_so - 1];
423 }
424 if (!isalnum(c) && c != '_') {
425 c = match_at[gl->matched_range.rm_eo];
426 }
427 if (!isalnum(c) && c != '_') {
428 found = 1;
429 } else {
430 /*
431 * Why check gl->matched_range.rm_eo?
432 * Zero-length match makes -w skip the line:
433 * "echo foo | grep ^" prints "foo",
434 * "echo foo | grep -w ^" prints nothing.
435 * Without such check, we can loop forever.
436 */
437#if !ENABLE_EXTRA_COMPAT
438 if (gl->matched_range.rm_eo != 0) {
439 match_at += gl->matched_range.rm_eo;
440 match_flg |= REG_NOTBOL;
441 goto opt_w_again;
442 }
443#else
444 if (gl->matched_range.rm_eo > start_pos) {
445 start_pos = gl->matched_range.rm_eo;
446 goto opt_w_again;
447 }
448#endif
449 }
450 }
451 }
452 }
453 /* If it's non-inverted search, we can stop
454 * at first match */
455 if (found && !invert_search)
456 goto do_found;
457 pattern_ptr = pattern_ptr->link;
458 } /* while (pattern_ptr) */
459
460 if (found ^ invert_search) {
461 do_found:
462 /* keep track of matches */
463 nmatches++;
464
465 /* quiet/print (non)matching file names only? */
466 if (option_mask32 & (OPT_q|OPT_l|OPT_L)) {
467 free(line); /* we don't need line anymore */
468 if (BE_QUIET) {
469 /* manpage says about -q:
470 * "exit immediately with zero status
471 * if any match is found,
472 * even if errors were detected" */
473 exit(EXIT_SUCCESS);
474 }
475 /* if we're just printing filenames, we stop after the first match */
476 if (PRINT_FILES_WITH_MATCHES) {
477 puts(cur_file);
478 /* fall through to "return 1" */
479 }
480 /* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
481 return 1; /* one match */
482 }
483
484#if ENABLE_FEATURE_GREP_CONTEXT
485 /* Were we printing context and saw next (unwanted) match? */
486 if ((option_mask32 & OPT_m) && nmatches > max_matches)
487 break;
488#endif
489
490 /* print the matched line */
491 if (PRINT_MATCH_COUNTS == 0) {
492#if ENABLE_FEATURE_GREP_CONTEXT
493 int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
494
495 /* if we were told to print 'before' lines and there is at least
496 * one line in the circular buffer, print them */
497 if (lines_before && before_buf[prevpos] != NULL) {
498 int first_buf_entry_line_num = linenum - lines_before;
499
500 /* advance to the first entry in the circular buffer, and
501 * figure out the line number is of the first line in the
502 * buffer */
503 idx = curpos;
504 while (before_buf[idx] == NULL) {
505 idx = (idx + 1) % lines_before;
506 first_buf_entry_line_num++;
507 }
508
509 /* now print each line in the buffer, clearing them as we go */
510 while (before_buf[idx] != NULL) {
511 print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-');
512 free(before_buf[idx]);
513 before_buf[idx] = NULL;
514 idx = (idx + 1) % lines_before;
515 first_buf_entry_line_num++;
516 }
517 }
518
519 /* make a note that we need to print 'after' lines */
520 print_n_lines_after = lines_after;
521#endif
522 if (option_mask32 & OPT_o) {
523 if (FGREP_FLAG) {
524 /* -Fo just prints the pattern
525 * (unless -v: -Fov doesnt print anything at all) */
526 if (found)
527 print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
528 } else while (1) {
529 unsigned start = gl->matched_range.rm_so;
530 unsigned end = gl->matched_range.rm_eo;
531 unsigned len = end - start;
532 char old = line[end];
533 line[end] = '\0';
534 /* Empty match is not printed: try "echo test | grep -o ''" */
535 if (len != 0)
536 print_line(line + start, len, linenum, ':');
537 if (old == '\0')
538 break;
539 line[end] = old;
540 if (len == 0)
541 end++;
542#if !ENABLE_EXTRA_COMPAT
543 if (regexec(&gl->compiled_regex, line + end,
544 1, &gl->matched_range, REG_NOTBOL) != 0)
545 break;
546 gl->matched_range.rm_so += end;
547 gl->matched_range.rm_eo += end;
548#else
549 if (re_search(&gl->compiled_regex, line, line_len,
550 end, line_len - end,
551 &gl->matched_range) < 0)
552 break;
553#endif
554 }
555 } else {
556 print_line(line, line_len, linenum, ':');
557 }
558 }
559 }
560#if ENABLE_FEATURE_GREP_CONTEXT
561 else { /* no match */
562 /* if we need to print some context lines after the last match, do so */
563 if (print_n_lines_after) {
564 print_line(line, strlen(line), linenum, '-');
565 print_n_lines_after--;
566 } else if (lines_before) {
567 /* Add the line to the circular 'before' buffer */
568 free(before_buf[curpos]);
569 before_buf[curpos] = line;
570 IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
571 curpos = (curpos + 1) % lines_before;
572 /* avoid free(line) - we took the line */
573 line = NULL;
574 }
575 }
576
577#endif /* ENABLE_FEATURE_GREP_CONTEXT */
578#if !ENABLE_EXTRA_COMPAT
579 free(line);
580#endif
581 /* Did we print all context after last requested match? */
582 if ((option_mask32 & OPT_m)
583 && !print_n_lines_after
584 && nmatches == max_matches
585 ) {
586 break;
587 }
588 } /* while (read line) */
589
590 /* special-case file post-processing for options where we don't print line
591 * matches, just filenames and possibly match counts */
592
593 /* grep -c: print [filename:]count, even if count is zero */
594 if (PRINT_MATCH_COUNTS) {
595 if (print_filename)
596 printf("%s:", cur_file);
597 printf("%d\n", nmatches);
598 }
599
600 /* grep -L: print just the filename */
601 if (PRINT_FILES_WITHOUT_MATCHES) {
602 /* nmatches is zero, no need to check it:
603 * we return 1 early if we detected a match
604 * and PRINT_FILES_WITHOUT_MATCHES is set */
605 puts(cur_file);
606 }
607
608 return nmatches;
609}
610
611#if ENABLE_FEATURE_CLEAN_UP
612#define new_grep_list_data(p, m) add_grep_list_data(p, m)
613static char *add_grep_list_data(char *pattern, int flg_used_mem)
614#else
615#define new_grep_list_data(p, m) add_grep_list_data(p)
616static char *add_grep_list_data(char *pattern)
617#endif
618{
619 grep_list_data_t *gl = xzalloc(sizeof(*gl));
620 gl->pattern = pattern;
621#if ENABLE_FEATURE_CLEAN_UP
622 gl->flg_mem_alocated_compiled = flg_used_mem;
623#else
624 /*gl->flg_mem_alocated_compiled = 0;*/
625#endif
626 return (char *)gl;
627}
628
629static void load_regexes_from_file(llist_t *fopt)
630{
631 while (fopt) {
632 char *line;
633 FILE *fp;
634 llist_t *cur = fopt;
635 char *ffile = cur->data;
636
637 fopt = cur->link;
638 free(cur);
639 fp = xfopen_stdin(ffile);
640 while ((line = xmalloc_fgetline(fp)) != NULL) {
641 llist_add_to(&pattern_head,
642 new_grep_list_data(line, ALLOCATED));
643 }
644 fclose_if_not_stdin(fp);
645 }
646}
647
648static int FAST_FUNC file_action_grep(const char *filename,
649 struct stat *statbuf UNUSED_PARAM,
650 void* matched,
651 int depth UNUSED_PARAM)
652{
653 FILE *file = fopen_for_read(filename);
654 if (file == NULL) {
655 if (!SUPPRESS_ERR_MSGS)
656 bb_simple_perror_msg(filename);
657 open_errors = 1;
658 return 0;
659 }
660 cur_file = filename;
661 *(int*)matched += grep_file(file);
662 fclose(file);
663 return 1;
664}
665
666static int grep_dir(const char *dir)
667{
668 int matched = 0;
669 recursive_action(dir,
670 /* recurse=yes */ ACTION_RECURSE |
671 /* followLinks=command line only */ ACTION_FOLLOWLINKS_L0 |
672 /* depthFirst=yes */ ACTION_DEPTHFIRST,
673 /* fileAction= */ file_action_grep,
674 /* dirAction= */ NULL,
675 /* userData= */ &matched,
676 /* depth= */ 0);
677 return matched;
678}
679
680int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
681int grep_main(int argc UNUSED_PARAM, char **argv)
682{
683 FILE *file;
684 int matched;
685 llist_t *fopt = NULL;
686#if ENABLE_FEATURE_GREP_CONTEXT
687 int Copt, opts;
688#endif
689 INIT_G();
690
691 /* For grep, exitcode of 1 is "not found". Other errors are 2: */
692 xfunc_error_retval = 2;
693
694 /* do normal option parsing */
695#if ENABLE_FEATURE_GREP_CONTEXT
696 /* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
697 * -m,-A,-B,-C have numeric param */
698 opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
699 opts = getopt32(argv,
700 OPTSTR_GREP,
701 &pattern_head, &fopt, &max_matches,
702 &lines_after, &lines_before, &Copt);
703
704 if (opts & OPT_C) {
705 /* -C unsets prev -A and -B, but following -A or -B
706 * may override it */
707 if (!(opts & OPT_A)) /* not overridden */
708 lines_after = Copt;
709 if (!(opts & OPT_B)) /* not overridden */
710 lines_before = Copt;
711 }
712 /* sanity checks */
713 if (opts & (OPT_c|OPT_q|OPT_l|OPT_L)) {
714 option_mask32 &= ~OPT_n;
715 lines_before = 0;
716 lines_after = 0;
717 } else if (lines_before > 0) {
718 if (lines_before > INT_MAX / sizeof(long long))
719 lines_before = INT_MAX / sizeof(long long);
720 /* overflow in (lines_before * sizeof(x)) is prevented (above) */
721 before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
722 IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
723 }
724#else
725 /* with auto sanity checks */
726 /* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
727 opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+";
728 getopt32(argv, OPTSTR_GREP,
729 &pattern_head, &fopt, &max_matches);
730#endif
731 invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
732
733 { /* convert char **argv to grep_list_data_t */
734 llist_t *cur;
735 for (cur = pattern_head; cur; cur = cur->link)
736 cur->data = new_grep_list_data(cur->data, 0);
737 }
738 if (option_mask32 & OPT_f) {
739 load_regexes_from_file(fopt);
740 if (!pattern_head) { /* -f EMPTY_FILE? */
741 /* GNU grep treats it as "nothing matches" */
742 llist_add_to(&pattern_head, new_grep_list_data((char*) "", 0));
743 invert_search ^= 1;
744 }
745 }
746
747 if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
748 option_mask32 |= OPT_F;
749
750#if !ENABLE_EXTRA_COMPAT
751 if (!(option_mask32 & (OPT_o | OPT_w | OPT_x)))
752 reflags = REG_NOSUB;
753#endif
754
755 if (ENABLE_FEATURE_GREP_EGREP_ALIAS
756 && (applet_name[0] == 'e' || (option_mask32 & OPT_E))
757 ) {
758 reflags |= REG_EXTENDED;
759 }
760#if ENABLE_EXTRA_COMPAT
761 else {
762 reflags = RE_SYNTAX_GREP;
763 }
764#endif
765
766 if (option_mask32 & OPT_i) {
767#if !ENABLE_EXTRA_COMPAT
768 reflags |= REG_ICASE;
769#else
770 int i;
771 case_fold = xmalloc(256);
772 for (i = 0; i < 256; i++)
773 case_fold[i] = (unsigned char)i;
774 for (i = 'a'; i <= 'z'; i++)
775 case_fold[i] = (unsigned char)(i - ('a' - 'A'));
776#endif
777 }
778
779 argv += optind;
780
781 /* if we didn't get a pattern from -e and no command file was specified,
782 * first parameter should be the pattern. no pattern, no worky */
783 if (pattern_head == NULL) {
784 char *pattern;
785 if (*argv == NULL)
786 bb_show_usage();
787 pattern = new_grep_list_data(*argv++, 0);
788 llist_add_to(&pattern_head, pattern);
789 }
790
791 /* argv[0..(argc-1)] should be names of file to grep through. If
792 * there is more than one file to grep, we will print the filenames. */
793 if (argv[0] && argv[1])
794 print_filename = 1;
795 /* -H / -h of course override */
796 if (option_mask32 & OPT_H)
797 print_filename = 1;
798 if (option_mask32 & OPT_h)
799 print_filename = 0;
800
801 /* If no files were specified, or '-' was specified, take input from
802 * stdin. Otherwise, we grep through all the files specified. */
803 matched = 0;
804 do {
805 cur_file = *argv;
806 file = stdin;
807 if (!cur_file || LONE_DASH(cur_file)) {
808 cur_file = "(standard input)";
809 } else {
810 if (option_mask32 & OPT_r) {
811 struct stat st;
812 if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
813 if (!(option_mask32 & OPT_h))
814 print_filename = 1;
815 matched += grep_dir(cur_file);
816 goto grep_done;
817 }
818 }
819 /* else: fopen(dir) will succeed, but reading won't */
820 file = fopen_for_read(cur_file);
821 if (file == NULL) {
822 if (!SUPPRESS_ERR_MSGS)
823 bb_simple_perror_msg(cur_file);
824 open_errors = 1;
825 continue;
826 }
827 }
828 matched += grep_file(file);
829 fclose_if_not_stdin(file);
830 grep_done: ;
831 } while (*argv && *++argv);
832
833 /* destroy all the elments in the pattern list */
834 if (ENABLE_FEATURE_CLEAN_UP) {
835 while (pattern_head) {
836 llist_t *pattern_head_ptr = pattern_head;
837 grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data;
838
839 pattern_head = pattern_head->link;
840 if (gl->flg_mem_alocated_compiled & ALLOCATED)
841 free(gl->pattern);
842 if (gl->flg_mem_alocated_compiled & COMPILED)
843 regfree(&gl->compiled_regex);
844 free(gl);
845 free(pattern_head_ptr);
846 }
847 }
848 /* 0 = success, 1 = failed, 2 = error */
849 if (open_errors)
850 return 2;
851 return !matched; /* invert return value: 0 = success, 1 = failed */
852}
Note: See TracBrowser for help on using the repository browser.