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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 "xregex.h"
62
63
64/* options */
65//usage:#define grep_trivial_usage
66//usage: "[-HhnlLoqvsriw"
67//usage: "F"
68//usage: IF_FEATURE_GREP_EGREP_ALIAS("E")
69//usage: IF_EXTRA_COMPAT("z")
70//usage: "] [-m N] "
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"
92//usage: )
93//usage: IF_EXTRA_COMPAT(
94//usage: "\n -z Input is NUL terminated"
95//usage: )
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'"
101//usage: )
102//usage: "\n -e PTRN Pattern to match"
103//usage: "\n -f FILE Read pattern from file"
104//usage:
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"
110//usage:
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 ""
115
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") \
121 "aI"
122/* ignored: -a "assume all files to be text" */
123/* ignored: -I "assume binary files have no matches" */
124enum {
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,
171};
172
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)
181
182struct globals {
183 int max_matches;
184#if !ENABLE_EXTRA_COMPAT
185 int reflags;
186#else
187 RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */
188#endif
189 smalluint invert_search;
190 smalluint print_filename;
191 smalluint open_errors;
192#if ENABLE_FEATURE_GREP_CONTEXT
193 smalluint did_print_line;
194 int lines_before;
195 int lines_after;
196 char **before_buf;
197 IF_EXTRA_COMPAT(size_t *before_buf_size;)
198 int last_line_printed;
199#endif
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 */
203} FIX_ALIASING;
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]; \
208 }; \
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 static grep_list_data_t *gl;
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#endif
379 char *match_at;
380
381 if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
382 gl->flg_mem_alocated_compiled |= COMPILED;
383#if !ENABLE_EXTRA_COMPAT
384 xregcomp(&gl->compiled_regex, gl->pattern, reflags);
385#else
386 memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
387 gl->compiled_regex.translate = case_fold; /* for -i */
388 if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
389 bb_error_msg_and_die("bad regex '%s'", gl->pattern);
390#endif
391 }
392#if !ENABLE_EXTRA_COMPAT
393 gl->matched_range.rm_so = 0;
394 gl->matched_range.rm_eo = 0;
395#else
396 start_pos = 0;
397#endif
398 match_at = line;
399 opt_w_again:
400//bb_error_msg("'%s' start_pos:%d line_len:%d", match_at, start_pos, line_len);
401 if (
402#if !ENABLE_EXTRA_COMPAT
403 regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, 0) == 0
404#else
405 re_search(&gl->compiled_regex, match_at, line_len,
406 start_pos, /*range:*/ line_len,
407 &gl->matched_range) >= 0
408#endif
409 ) {
410 if (option_mask32 & OPT_x) {
411 found = (gl->matched_range.rm_so == 0
412 && match_at[gl->matched_range.rm_eo] == '\0');
413 } else
414 if (!(option_mask32 & OPT_w)) {
415 found = 1;
416 } else {
417 char c = ' ';
418 if (gl->matched_range.rm_so)
419 c = match_at[gl->matched_range.rm_so - 1];
420 if (!isalnum(c) && c != '_') {
421 c = match_at[gl->matched_range.rm_eo];
422 if (!c || (!isalnum(c) && c != '_')) {
423 found = 1;
424 } else {
425 /*
426 * Why check gl->matched_range.rm_eo?
427 * Zero-length match makes -w skip the line:
428 * "echo foo | grep ^" prints "foo",
429 * "echo foo | grep -w ^" prints nothing.
430 * Without such check, we can loop forever.
431 */
432#if !ENABLE_EXTRA_COMPAT
433 if (gl->matched_range.rm_eo != 0) {
434 match_at += gl->matched_range.rm_eo;
435 goto opt_w_again;
436 }
437#else
438 if (gl->matched_range.rm_eo > start_pos) {
439 start_pos = gl->matched_range.rm_eo;
440 goto opt_w_again;
441 }
442#endif
443 }
444 }
445 }
446 }
447 }
448 /* If it's non-inverted search, we can stop
449 * at first match */
450 if (found && !invert_search)
451 goto do_found;
452 pattern_ptr = pattern_ptr->link;
453 } /* while (pattern_ptr) */
454
455 if (found ^ invert_search) {
456 do_found:
457 /* keep track of matches */
458 nmatches++;
459
460 /* quiet/print (non)matching file names only? */
461 if (option_mask32 & (OPT_q|OPT_l|OPT_L)) {
462 free(line); /* we don't need line anymore */
463 if (BE_QUIET) {
464 /* manpage says about -q:
465 * "exit immediately with zero status
466 * if any match is found,
467 * even if errors were detected" */
468 exit(EXIT_SUCCESS);
469 }
470 /* if we're just printing filenames, we stop after the first match */
471 if (PRINT_FILES_WITH_MATCHES) {
472 puts(cur_file);
473 /* fall through to "return 1" */
474 }
475 /* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
476 return 1; /* one match */
477 }
478
479#if ENABLE_FEATURE_GREP_CONTEXT
480 /* Were we printing context and saw next (unwanted) match? */
481 if ((option_mask32 & OPT_m) && nmatches > max_matches)
482 break;
483#endif
484
485 /* print the matched line */
486 if (PRINT_MATCH_COUNTS == 0) {
487#if ENABLE_FEATURE_GREP_CONTEXT
488 int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
489
490 /* if we were told to print 'before' lines and there is at least
491 * one line in the circular buffer, print them */
492 if (lines_before && before_buf[prevpos] != NULL) {
493 int first_buf_entry_line_num = linenum - lines_before;
494
495 /* advance to the first entry in the circular buffer, and
496 * figure out the line number is of the first line in the
497 * buffer */
498 idx = curpos;
499 while (before_buf[idx] == NULL) {
500 idx = (idx + 1) % lines_before;
501 first_buf_entry_line_num++;
502 }
503
504 /* now print each line in the buffer, clearing them as we go */
505 while (before_buf[idx] != NULL) {
506 print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-');
507 free(before_buf[idx]);
508 before_buf[idx] = NULL;
509 idx = (idx + 1) % lines_before;
510 first_buf_entry_line_num++;
511 }
512 }
513
514 /* make a note that we need to print 'after' lines */
515 print_n_lines_after = lines_after;
516#endif
517 if (option_mask32 & OPT_o) {
518 if (FGREP_FLAG) {
519 /* -Fo just prints the pattern
520 * (unless -v: -Fov doesnt print anything at all) */
521 if (found)
522 print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
523 } else while (1) {
524 unsigned start = gl->matched_range.rm_so;
525 unsigned end = gl->matched_range.rm_eo;
526 unsigned len = end - start;
527 char old = line[end];
528 line[end] = '\0';
529 /* Empty match is not printed: try "echo test | grep -o ''" */
530 if (len != 0)
531 print_line(line + start, len, linenum, ':');
532 if (old == '\0')
533 break;
534 line[end] = old;
535 if (len == 0)
536 end++;
537#if !ENABLE_EXTRA_COMPAT
538 if (regexec(&gl->compiled_regex, line + end,
539 1, &gl->matched_range, REG_NOTBOL) != 0)
540 break;
541 gl->matched_range.rm_so += end;
542 gl->matched_range.rm_eo += end;
543#else
544 if (re_search(&gl->compiled_regex, line, line_len,
545 end, line_len - end,
546 &gl->matched_range) < 0)
547 break;
548#endif
549 }
550 } else {
551 print_line(line, line_len, linenum, ':');
552 }
553 }
554 }
555#if ENABLE_FEATURE_GREP_CONTEXT
556 else { /* no match */
557 /* if we need to print some context lines after the last match, do so */
558 if (print_n_lines_after) {
559 print_line(line, strlen(line), linenum, '-');
560 print_n_lines_after--;
561 } else if (lines_before) {
562 /* Add the line to the circular 'before' buffer */
563 free(before_buf[curpos]);
564 before_buf[curpos] = line;
565 IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
566 curpos = (curpos + 1) % lines_before;
567 /* avoid free(line) - we took the line */
568 line = NULL;
569 }
570 }
571
572#endif /* ENABLE_FEATURE_GREP_CONTEXT */
573#if !ENABLE_EXTRA_COMPAT
574 free(line);
575#endif
576 /* Did we print all context after last requested match? */
577 if ((option_mask32 & OPT_m)
578 && !print_n_lines_after
579 && nmatches == max_matches
580 ) {
581 break;
582 }
583 } /* while (read line) */
584
585 /* special-case file post-processing for options where we don't print line
586 * matches, just filenames and possibly match counts */
587
588 /* grep -c: print [filename:]count, even if count is zero */
589 if (PRINT_MATCH_COUNTS) {
590 if (print_filename)
591 printf("%s:", cur_file);
592 printf("%d\n", nmatches);
593 }
594
595 /* grep -L: print just the filename */
596 if (PRINT_FILES_WITHOUT_MATCHES) {
597 /* nmatches is zero, no need to check it:
598 * we return 1 early if we detected a match
599 * and PRINT_FILES_WITHOUT_MATCHES is set */
600 puts(cur_file);
601 }
602
603 return nmatches;
604}
605
606#if ENABLE_FEATURE_CLEAN_UP
607#define new_grep_list_data(p, m) add_grep_list_data(p, m)
608static char *add_grep_list_data(char *pattern, int flg_used_mem)
609#else
610#define new_grep_list_data(p, m) add_grep_list_data(p)
611static char *add_grep_list_data(char *pattern)
612#endif
613{
614 grep_list_data_t *gl = xzalloc(sizeof(*gl));
615 gl->pattern = pattern;
616#if ENABLE_FEATURE_CLEAN_UP
617 gl->flg_mem_alocated_compiled = flg_used_mem;
618#else
619 /*gl->flg_mem_alocated_compiled = 0;*/
620#endif
621 return (char *)gl;
622}
623
624static void load_regexes_from_file(llist_t *fopt)
625{
626 while (fopt) {
627 char *line;
628 FILE *fp;
629 llist_t *cur = fopt;
630 char *ffile = cur->data;
631
632 fopt = cur->link;
633 free(cur);
634 fp = xfopen_stdin(ffile);
635 while ((line = xmalloc_fgetline(fp)) != NULL) {
636 llist_add_to(&pattern_head,
637 new_grep_list_data(line, ALLOCATED));
638 }
639 fclose_if_not_stdin(fp);
640 }
641}
642
643static int FAST_FUNC file_action_grep(const char *filename,
644 struct stat *statbuf UNUSED_PARAM,
645 void* matched,
646 int depth UNUSED_PARAM)
647{
648 FILE *file = fopen_for_read(filename);
649 if (file == NULL) {
650 if (!SUPPRESS_ERR_MSGS)
651 bb_simple_perror_msg(filename);
652 open_errors = 1;
653 return 0;
654 }
655 cur_file = filename;
656 *(int*)matched += grep_file(file);
657 fclose(file);
658 return 1;
659}
660
661static int grep_dir(const char *dir)
662{
663 int matched = 0;
664 recursive_action(dir,
665 /* recurse=yes */ ACTION_RECURSE |
666 /* followLinks=no */
667 /* depthFirst=yes */ ACTION_DEPTHFIRST,
668 /* fileAction= */ file_action_grep,
669 /* dirAction= */ NULL,
670 /* userData= */ &matched,
671 /* depth= */ 0);
672 return matched;
673}
674
675int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
676int grep_main(int argc UNUSED_PARAM, char **argv)
677{
678 FILE *file;
679 int matched;
680 llist_t *fopt = NULL;
681
682 /* do normal option parsing */
683#if ENABLE_FEATURE_GREP_CONTEXT
684 int Copt, opts;
685
686 /* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
687 * -m,-A,-B,-C have numeric param */
688 opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
689 opts = getopt32(argv,
690 OPTSTR_GREP,
691 &pattern_head, &fopt, &max_matches,
692 &lines_after, &lines_before, &Copt);
693
694 if (opts & OPT_C) {
695 /* -C unsets prev -A and -B, but following -A or -B
696 * may override it */
697 if (!(opts & OPT_A)) /* not overridden */
698 lines_after = Copt;
699 if (!(opts & OPT_B)) /* not overridden */
700 lines_before = Copt;
701 }
702 /* sanity checks */
703 if (opts & (OPT_c|OPT_q|OPT_l|OPT_L)) {
704 option_mask32 &= ~OPT_n;
705 lines_before = 0;
706 lines_after = 0;
707 } else if (lines_before > 0) {
708 if ((unsigned) lines_before > (unsigned) (INT_MAX / sizeof(long long)))
709 lines_before = INT_MAX / sizeof(long long);
710 /* overflow in (lines_before * sizeof(x)) is prevented (above) */
711 before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
712 IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
713 }
714#else
715 /* with auto sanity checks */
716 /* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
717 opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+";
718 getopt32(argv, OPTSTR_GREP,
719 &pattern_head, &fopt, &max_matches);
720#endif
721 invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
722
723 { /* convert char **argv to grep_list_data_t */
724 llist_t *cur;
725 for (cur = pattern_head; cur; cur = cur->link)
726 cur->data = new_grep_list_data(cur->data, 0);
727 }
728 if (option_mask32 & OPT_f) {
729 load_regexes_from_file(fopt);
730 if (!pattern_head) { /* -f EMPTY_FILE? */
731 /* GNU grep treats it as "nothing matches" */
732 llist_add_to(&pattern_head, new_grep_list_data((char*) "", 0));
733 invert_search ^= 1;
734 }
735 }
736
737 if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
738 option_mask32 |= OPT_F;
739
740#if !ENABLE_EXTRA_COMPAT
741 if (!(option_mask32 & (OPT_o | OPT_w | OPT_x)))
742 reflags = REG_NOSUB;
743#endif
744
745 if (ENABLE_FEATURE_GREP_EGREP_ALIAS
746 && (applet_name[0] == 'e' || (option_mask32 & OPT_E))
747 ) {
748 reflags |= REG_EXTENDED;
749 }
750#if ENABLE_EXTRA_COMPAT
751 else {
752 reflags = RE_SYNTAX_GREP;
753 }
754#endif
755
756 if (option_mask32 & OPT_i) {
757#if !ENABLE_EXTRA_COMPAT
758 reflags |= REG_ICASE;
759#else
760 int i;
761 case_fold = xmalloc(256);
762 for (i = 0; i < 256; i++)
763 case_fold[i] = (unsigned char)i;
764 for (i = 'a'; i <= 'z'; i++)
765 case_fold[i] = (unsigned char)(i - ('a' - 'A'));
766#endif
767 }
768
769 argv += optind;
770
771 /* if we didn't get a pattern from -e and no command file was specified,
772 * first parameter should be the pattern. no pattern, no worky */
773 if (pattern_head == NULL) {
774 char *pattern;
775 if (*argv == NULL)
776 bb_show_usage();
777 pattern = new_grep_list_data(*argv++, 0);
778 llist_add_to(&pattern_head, pattern);
779 }
780
781 /* argv[0..(argc-1)] should be names of file to grep through. If
782 * there is more than one file to grep, we will print the filenames. */
783 if (argv[0] && argv[1])
784 print_filename = 1;
785 /* -H / -h of course override */
786 if (option_mask32 & OPT_H)
787 print_filename = 1;
788 if (option_mask32 & OPT_h)
789 print_filename = 0;
790
791 /* If no files were specified, or '-' was specified, take input from
792 * stdin. Otherwise, we grep through all the files specified. */
793 matched = 0;
794 do {
795 cur_file = *argv;
796 file = stdin;
797 if (!cur_file || LONE_DASH(cur_file)) {
798 cur_file = "(standard input)";
799 } else {
800 if (option_mask32 & OPT_r) {
801 struct stat st;
802 if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
803 if (!(option_mask32 & OPT_h))
804 print_filename = 1;
805 matched += grep_dir(cur_file);
806 goto grep_done;
807 }
808 }
809 /* else: fopen(dir) will succeed, but reading won't */
810 file = fopen_for_read(cur_file);
811 if (file == NULL) {
812 if (!SUPPRESS_ERR_MSGS)
813 bb_simple_perror_msg(cur_file);
814 open_errors = 1;
815 continue;
816 }
817 }
818 matched += grep_file(file);
819 fclose_if_not_stdin(file);
820 grep_done: ;
821 } while (*argv && *++argv);
822
823 /* destroy all the elments in the pattern list */
824 if (ENABLE_FEATURE_CLEAN_UP) {
825 while (pattern_head) {
826 llist_t *pattern_head_ptr = pattern_head;
827 grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data;
828
829 pattern_head = pattern_head->link;
830 if (gl->flg_mem_alocated_compiled & ALLOCATED)
831 free(gl->pattern);
832 if (gl->flg_mem_alocated_compiled & COMPILED)
833 regfree(&gl->compiled_regex);
834 free(gl);
835 free(pattern_head_ptr);
836 }
837 }
838 /* 0 = success, 1 = failed, 2 = error */
839 if (open_errors)
840 return 2;
841 return !matched; /* invert return value: 0 = success, 1 = failed */
842}
843
generated by cgit at 2024-05-15 05:39:40 (GMT)