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 //config:config GREP
22 //config: bool "grep"
23 //config: default y
24 //config: help
25 //config: grep is used to search files for a specified pattern.
26 //config:
27 //config:config EGREP
28 //config: bool "egrep"
29 //config: default y
30 //config: help
31 //config: Alias to "grep -E"
32 //config:
33 //config:config FGREP
34 //config: bool "fgrep"
35 //config: default y
36 //config: help
37 //config: Alias to "grep -F"
38 //config:
39 //config:config FEATURE_GREP_CONTEXT
40 //config: bool "Enable before and after context flags (-A, -B and -C)"
41 //config: default y
42 //config: depends on GREP || EGREP
43 //config: help
44 //config: Print the specified number of leading (-B) and/or trailing (-A)
45 //config: context surrounding our matching lines.
46 //config: Print the specified number of context lines (-C).
47
48 //applet:IF_GREP(APPLET(grep, BB_DIR_BIN, BB_SUID_DROP))
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))
51
52 //kbuild:lib-$(CONFIG_GREP) += grep.o
53 //kbuild:lib-$(CONFIG_EGREP) += grep.o
54 //kbuild:lib-$(CONFIG_FGREP) += grep.o
55
56 #include "libbb.h"
57 #include "common_bufsiz.h"
58 #include "xregex.h"
59
60
61 /* options */
62 //usage:#define grep_trivial_usage
63 //usage: "[-HhnlLoqvsriwFE"
64 //usage: IF_EXTRA_COMPAT("z")
65 //usage: "] [-m N] "
66 //usage: IF_FEATURE_GREP_CONTEXT("[-A/B/C N] ")
67 //usage: "PATTERN/-e PATTERN.../-f FILE [FILE]..."
68 //usage:#define grep_full_usage "\n\n"
69 //usage: "Search for PATTERN in FILEs (or stdin)\n"
70 //usage: "\n -H Add 'filename:' prefix"
71 //usage: "\n -h Do not add 'filename:' prefix"
72 //usage: "\n -n Add 'line_no:' prefix"
73 //usage: "\n -l Show only names of files that match"
74 //usage: "\n -L Show only names of files that don't match"
75 //usage: "\n -c Show only count of matching lines"
76 //usage: "\n -o Show only the matching part of line"
77 //usage: "\n -q Quiet. Return 0 if PATTERN is found, 1 otherwise"
78 //usage: "\n -v Select non-matching lines"
79 //usage: "\n -s Suppress open and read errors"
80 //usage: "\n -r Recurse"
81 //usage: "\n -i Ignore case"
82 //usage: "\n -w Match whole words only"
83 //usage: "\n -x Match whole lines only"
84 //usage: "\n -F PATTERN is a literal (not regexp)"
85 //usage: "\n -E PATTERN is an extended regexp"
86 //usage: IF_EXTRA_COMPAT(
87 //usage: "\n -z Input is NUL terminated"
88 //usage: )
89 //usage: "\n -m N Match up to N times per file"
90 //usage: IF_FEATURE_GREP_CONTEXT(
91 //usage: "\n -A N Print N lines of trailing context"
92 //usage: "\n -B N Print N lines of leading context"
93 //usage: "\n -C N Same as '-A N -B N'"
94 //usage: )
95 //usage: "\n -e PTRN Pattern to match"
96 //usage: "\n -f FILE Read pattern from file"
97 //usage:
98 //usage:#define grep_example_usage
99 //usage: "$ 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"
103 //usage:
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 ""
108
109 #define OPTSTR_GREP \
110 "lnqvscFiHhe:*f:*Lorm:+wx" \
111 IF_FEATURE_GREP_CONTEXT("A:+B:+C:+") \
112 "E" \
113 IF_EXTRA_COMPAT("z") \
114 "aI"
115 /* ignored: -a "assume all files to be text" */
116 /* ignored: -I "assume binary files have no matches" */
117 enum {
118 OPTBIT_l, /* list matched file names only */
119 OPTBIT_n, /* print line# */
120 OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */
121 OPTBIT_v, /* invert the match, to select non-matching lines */
122 OPTBIT_s, /* suppress errors about file open errors */
123 OPTBIT_c, /* count matches per file (suppresses normal output) */
124 OPTBIT_F, /* literal match */
125 OPTBIT_i, /* case-insensitive */
126 OPTBIT_H, /* force filename display */
127 OPTBIT_h, /* inhibit filename display */
128 OPTBIT_e, /* -e PATTERN */
129 OPTBIT_f, /* -f FILE_WITH_PATTERNS */
130 OPTBIT_L, /* list unmatched file names only */
131 OPTBIT_o, /* show only matching parts of lines */
132 OPTBIT_r, /* recurse dirs */
133 OPTBIT_m, /* -m MAX_MATCHES */
134 OPTBIT_w, /* -w whole word match */
135 OPTBIT_x, /* -x whole line match */
136 IF_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */
137 IF_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */
138 IF_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */
139 OPTBIT_E, /* extended regexp */
140 IF_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */
141 OPT_l = 1 << OPTBIT_l,
142 OPT_n = 1 << OPTBIT_n,
143 OPT_q = 1 << OPTBIT_q,
144 OPT_v = 1 << OPTBIT_v,
145 OPT_s = 1 << OPTBIT_s,
146 OPT_c = 1 << OPTBIT_c,
147 OPT_F = 1 << OPTBIT_F,
148 OPT_i = 1 << OPTBIT_i,
149 OPT_H = 1 << OPTBIT_H,
150 OPT_h = 1 << OPTBIT_h,
151 OPT_e = 1 << OPTBIT_e,
152 OPT_f = 1 << OPTBIT_f,
153 OPT_L = 1 << OPTBIT_L,
154 OPT_o = 1 << OPTBIT_o,
155 OPT_r = 1 << OPTBIT_r,
156 OPT_m = 1 << OPTBIT_m,
157 OPT_w = 1 << OPTBIT_w,
158 OPT_x = 1 << OPTBIT_x,
159 OPT_A = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0,
160 OPT_B = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0,
161 OPT_C = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0,
162 OPT_E = 1 << OPTBIT_E,
163 OPT_z = IF_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0,
164 };
165
166 #define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l)
167 #define PRINT_LINE_NUM (option_mask32 & OPT_n)
168 #define BE_QUIET (option_mask32 & OPT_q)
169 #define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s)
170 #define PRINT_MATCH_COUNTS (option_mask32 & OPT_c)
171 #define FGREP_FLAG (option_mask32 & OPT_F)
172 #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
173 #define NUL_DELIMITED (option_mask32 & OPT_z)
174
175 struct globals {
176 int max_matches;
177 #if !ENABLE_EXTRA_COMPAT
178 int reflags;
179 #else
180 RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */
181 #endif
182 smalluint invert_search;
183 smalluint print_filename;
184 smalluint open_errors;
185 #if ENABLE_FEATURE_GREP_CONTEXT
186 smalluint did_print_line;
187 int lines_before;
188 int lines_after;
189 char **before_buf;
190 IF_EXTRA_COMPAT(size_t *before_buf_size;)
191 int last_line_printed;
192 #endif
193 /* globals used internally */
194 llist_t *pattern_head; /* growable list of patterns to match */
195 const char *cur_file; /* the current file we are reading */
196 } FIX_ALIASING;
197 #define G (*(struct globals*)bb_common_bufsiz1)
198 #define INIT_G() do { \
199 setup_common_bufsiz(); \
200 BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
201 } while (0)
202 #define max_matches (G.max_matches )
203 #if !ENABLE_EXTRA_COMPAT
204 # define reflags (G.reflags )
205 #else
206 # define case_fold (G.case_fold )
207 /* http://www.delorie.com/gnu/docs/regex/regex_46.html */
208 # define reflags re_syntax_options
209 # undef REG_NOSUB
210 # undef REG_EXTENDED
211 # undef REG_ICASE
212 # define REG_NOSUB bug:is:here /* should not be used */
213 /* Just RE_SYNTAX_EGREP is not enough, need to enable {n[,[m]]} too */
214 # define REG_EXTENDED (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES)
215 # define REG_ICASE bug:is:here /* should not be used */
216 #endif
217 #define invert_search (G.invert_search )
218 #define print_filename (G.print_filename )
219 #define open_errors (G.open_errors )
220 #define did_print_line (G.did_print_line )
221 #define lines_before (G.lines_before )
222 #define lines_after (G.lines_after )
223 #define before_buf (G.before_buf )
224 #define before_buf_size (G.before_buf_size )
225 #define last_line_printed (G.last_line_printed )
226 #define pattern_head (G.pattern_head )
227 #define cur_file (G.cur_file )
228
229
230 typedef struct grep_list_data_t {
231 char *pattern;
232 /* for GNU regex, matched_range must be persistent across grep_file() calls */
233 #if !ENABLE_EXTRA_COMPAT
234 regex_t compiled_regex;
235 regmatch_t matched_range;
236 #else
237 struct re_pattern_buffer compiled_regex;
238 struct re_registers matched_range;
239 #endif
240 #define ALLOCATED 1
241 #define COMPILED 2
242 int flg_mem_allocated_compiled;
243 } grep_list_data_t;
244
245 #if !ENABLE_EXTRA_COMPAT
246 #define print_line(line, line_len, linenum, decoration) \
247 print_line(line, linenum, decoration)
248 #endif
print_line(const char * line,size_t line_len,int linenum,char decoration)249 static void print_line(const char *line, size_t line_len, int linenum, char decoration)
250 {
251 #if ENABLE_FEATURE_GREP_CONTEXT
252 /* Happens when we go to next file, immediately hit match
253 * and try to print prev context... from prev file! Don't do it */
254 if (linenum < 1)
255 return;
256 /* possibly print the little '--' separator */
257 if ((lines_before || lines_after) && did_print_line
258 && last_line_printed != linenum - 1
259 ) {
260 puts("--");
261 }
262 /* guard against printing "--" before first line of first file */
263 did_print_line = 1;
264 last_line_printed = linenum;
265 #endif
266 if (print_filename)
267 printf("%s%c", cur_file, decoration);
268 if (PRINT_LINE_NUM)
269 printf("%i%c", linenum, decoration);
270 /* Emulate weird GNU grep behavior with -ov */
271 if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o)) {
272 #if !ENABLE_EXTRA_COMPAT
273 puts(line);
274 #else
275 fwrite(line, 1, line_len, stdout);
276 putchar(NUL_DELIMITED ? '\0' : '\n');
277 #endif
278 }
279 }
280
281 #if ENABLE_EXTRA_COMPAT
282 /* Unlike getline, this one removes trailing '\n' */
bb_getline(char ** line_ptr,size_t * line_alloc_len,FILE * file)283 static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file)
284 {
285 ssize_t res_sz;
286 char *line;
287 int delim = (NUL_DELIMITED ? '\0' : '\n');
288
289 res_sz = getdelim(line_ptr, line_alloc_len, delim, file);
290 line = *line_ptr;
291
292 if (res_sz > 0) {
293 if (line[res_sz - 1] == delim)
294 line[--res_sz] = '\0';
295 } else {
296 free(line); /* uclibc allocates a buffer even on EOF. WTF? */
297 }
298 return res_sz;
299 }
300 #endif
301
grep_file(FILE * file)302 static int grep_file(FILE *file)
303 {
304 smalluint found;
305 int linenum = 0;
306 int nmatches = 0;
307 #if !ENABLE_EXTRA_COMPAT
308 char *line;
309 #else
310 char *line = NULL;
311 ssize_t line_len;
312 size_t line_alloc_len;
313 # define rm_so start[0]
314 # define rm_eo end[0]
315 #endif
316 #if ENABLE_FEATURE_GREP_CONTEXT
317 int print_n_lines_after = 0;
318 int curpos = 0; /* track where we are in the circular 'before' buffer */
319 int idx = 0; /* used for iteration through the circular buffer */
320 #else
321 enum { print_n_lines_after = 0 };
322 #endif
323
324 while (
325 #if !ENABLE_EXTRA_COMPAT
326 (line = xmalloc_fgetline(file)) != NULL
327 #else
328 (line_len = bb_getline(&line, &line_alloc_len, file)) >= 0
329 #endif
330 ) {
331 llist_t *pattern_ptr = pattern_head;
332 grep_list_data_t *gl = gl; /* for gcc */
333
334 linenum++;
335 found = 0;
336 while (pattern_ptr) {
337 gl = (grep_list_data_t *)pattern_ptr->data;
338 if (FGREP_FLAG) {
339 char *match;
340 char *str = line;
341 opt_f_again:
342 match = ((option_mask32 & OPT_i)
343 ? strcasestr(str, gl->pattern)
344 : strstr(str, gl->pattern)
345 );
346 if (match) {
347 if (option_mask32 & OPT_x) {
348 if (match != str)
349 goto opt_f_not_found;
350 if (str[strlen(gl->pattern)] != '\0')
351 goto opt_f_not_found;
352 } else
353 if (option_mask32 & OPT_w) {
354 char c = (match != str) ? match[-1] : ' ';
355 if (!isalnum(c) && c != '_') {
356 c = match[strlen(gl->pattern)];
357 if (!c || (!isalnum(c) && c != '_'))
358 goto opt_f_found;
359 }
360 str = match + 1;
361 goto opt_f_again;
362 }
363 opt_f_found:
364 found = 1;
365 opt_f_not_found: ;
366 }
367 } else {
368 #if ENABLE_EXTRA_COMPAT
369 unsigned start_pos;
370 #else
371 int match_flg;
372 #endif
373 char *match_at;
374
375 if (!(gl->flg_mem_allocated_compiled & COMPILED)) {
376 gl->flg_mem_allocated_compiled |= COMPILED;
377 #if !ENABLE_EXTRA_COMPAT
378 xregcomp(&gl->compiled_regex, gl->pattern, reflags);
379 #else
380 memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
381 gl->compiled_regex.translate = case_fold; /* for -i */
382 if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
383 bb_error_msg_and_die("bad regex '%s'", gl->pattern);
384 #endif
385 }
386 #if !ENABLE_EXTRA_COMPAT
387 gl->matched_range.rm_so = 0;
388 gl->matched_range.rm_eo = 0;
389 match_flg = 0;
390 #else
391 start_pos = 0;
392 #endif
393 match_at = line;
394 opt_w_again:
395 //bb_error_msg("'%s' start_pos:%d line_len:%d", match_at, start_pos, line_len);
396 if (
397 #if !ENABLE_EXTRA_COMPAT
398 regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, match_flg) == 0
399 #else
400 re_search(&gl->compiled_regex, match_at, line_len,
401 start_pos, /*range:*/ line_len,
402 &gl->matched_range) >= 0
403 #endif
404 ) {
405 if (option_mask32 & OPT_x) {
406 found = (gl->matched_range.rm_so == 0
407 && match_at[gl->matched_range.rm_eo] == '\0');
408 } else
409 if (!(option_mask32 & OPT_w)) {
410 found = 1;
411 } else {
412 char c = ' ';
413 if (match_at > line || gl->matched_range.rm_so != 0) {
414 c = match_at[gl->matched_range.rm_so - 1];
415 }
416 if (!isalnum(c) && c != '_') {
417 c = match_at[gl->matched_range.rm_eo];
418 }
419 if (!isalnum(c) && c != '_') {
420 found = 1;
421 } else {
422 /*
423 * Why check gl->matched_range.rm_eo?
424 * Zero-length match makes -w skip the line:
425 * "echo foo | grep ^" prints "foo",
426 * "echo foo | grep -w ^" prints nothing.
427 * Without such check, we can loop forever.
428 */
429 #if !ENABLE_EXTRA_COMPAT
430 if (gl->matched_range.rm_eo != 0) {
431 match_at += gl->matched_range.rm_eo;
432 match_flg |= REG_NOTBOL;
433 goto opt_w_again;
434 }
435 #else
436 if (gl->matched_range.rm_eo > start_pos) {
437 start_pos = gl->matched_range.rm_eo;
438 goto opt_w_again;
439 }
440 #endif
441 }
442 }
443 }
444 }
445 /* If it's non-inverted search, we can stop
446 * at first match */
447 if (found && !invert_search)
448 goto do_found;
449 pattern_ptr = pattern_ptr->link;
450 } /* while (pattern_ptr) */
451
452 if (found ^ invert_search) {
453 do_found:
454 /* keep track of matches */
455 nmatches++;
456
457 /* quiet/print (non)matching file names only? */
458 if (option_mask32 & (OPT_q|OPT_l|OPT_L)) {
459 free(line); /* we don't need line anymore */
460 if (BE_QUIET) {
461 /* manpage says about -q:
462 * "exit immediately with zero status
463 * if any match is found,
464 * even if errors were detected" */
465 exit(EXIT_SUCCESS);
466 }
467 /* if we're just printing filenames, we stop after the first match */
468 if (PRINT_FILES_WITH_MATCHES) {
469 puts(cur_file);
470 /* fall through to "return 1" */
471 }
472 /* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
473 return 1; /* one match */
474 }
475
476 #if ENABLE_FEATURE_GREP_CONTEXT
477 /* Were we printing context and saw next (unwanted) match? */
478 if ((option_mask32 & OPT_m) && nmatches > max_matches)
479 break;
480 #endif
481
482 /* print the matched line */
483 if (PRINT_MATCH_COUNTS == 0) {
484 #if ENABLE_FEATURE_GREP_CONTEXT
485 int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
486
487 /* if we were told to print 'before' lines and there is at least
488 * one line in the circular buffer, print them */
489 if (lines_before && before_buf[prevpos] != NULL) {
490 int first_buf_entry_line_num = linenum - lines_before;
491
492 /* advance to the first entry in the circular buffer, and
493 * figure out the line number is of the first line in the
494 * buffer */
495 idx = curpos;
496 while (before_buf[idx] == NULL) {
497 idx = (idx + 1) % lines_before;
498 first_buf_entry_line_num++;
499 }
500
501 /* now print each line in the buffer, clearing them as we go */
502 while (before_buf[idx] != NULL) {
503 print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-');
504 free(before_buf[idx]);
505 before_buf[idx] = NULL;
506 idx = (idx + 1) % lines_before;
507 first_buf_entry_line_num++;
508 }
509 }
510
511 /* make a note that we need to print 'after' lines */
512 print_n_lines_after = lines_after;
513 #endif
514 if (option_mask32 & OPT_o) {
515 if (FGREP_FLAG) {
516 /* -Fo just prints the pattern
517 * (unless -v: -Fov doesnt print anything at all) */
518 if (found)
519 print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
520 } else while (1) {
521 unsigned start = gl->matched_range.rm_so;
522 unsigned end = gl->matched_range.rm_eo;
523 unsigned len = end - start;
524 char old = line[end];
525 line[end] = '\0';
526 /* Empty match is not printed: try "echo test | grep -o ''" */
527 if (len != 0)
528 print_line(line + start, len, linenum, ':');
529 if (old == '\0')
530 break;
531 line[end] = old;
532 if (len == 0)
533 end++;
534 #if !ENABLE_EXTRA_COMPAT
535 if (regexec(&gl->compiled_regex, line + end,
536 1, &gl->matched_range, REG_NOTBOL) != 0)
537 break;
538 gl->matched_range.rm_so += end;
539 gl->matched_range.rm_eo += end;
540 #else
541 if (re_search(&gl->compiled_regex, line, line_len,
542 end, line_len - end,
543 &gl->matched_range) < 0)
544 break;
545 #endif
546 }
547 } else {
548 print_line(line, line_len, linenum, ':');
549 }
550 }
551 }
552 #if ENABLE_FEATURE_GREP_CONTEXT
553 else { /* no match */
554 /* if we need to print some context lines after the last match, do so */
555 if (print_n_lines_after) {
556 print_line(line, strlen(line), linenum, '-');
557 print_n_lines_after--;
558 } else if (lines_before) {
559 /* Add the line to the circular 'before' buffer */
560 free(before_buf[curpos]);
561 before_buf[curpos] = line;
562 IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
563 curpos = (curpos + 1) % lines_before;
564 /* avoid free(line) - we took the line */
565 line = NULL;
566 }
567 }
568
569 #endif /* ENABLE_FEATURE_GREP_CONTEXT */
570 #if !ENABLE_EXTRA_COMPAT
571 free(line);
572 #endif
573 /* Did we print all context after last requested match? */
574 if ((option_mask32 & OPT_m)
575 && !print_n_lines_after
576 && nmatches == max_matches
577 ) {
578 break;
579 }
580 } /* while (read line) */
581
582 /* special-case file post-processing for options where we don't print line
583 * matches, just filenames and possibly match counts */
584
585 /* grep -c: print [filename:]count, even if count is zero */
586 if (PRINT_MATCH_COUNTS) {
587 if (print_filename)
588 printf("%s:", cur_file);
589 printf("%d\n", nmatches);
590 }
591
592 /* grep -L: print just the filename */
593 if (PRINT_FILES_WITHOUT_MATCHES) {
594 /* nmatches is zero, no need to check it:
595 * we return 1 early if we detected a match
596 * and PRINT_FILES_WITHOUT_MATCHES is set */
597 puts(cur_file);
598 }
599
600 return nmatches;
601 }
602
603 #if ENABLE_FEATURE_CLEAN_UP
604 #define new_grep_list_data(p, m) add_grep_list_data(p, m)
add_grep_list_data(char * pattern,int flg_used_mem)605 static char *add_grep_list_data(char *pattern, int flg_used_mem)
606 #else
607 #define new_grep_list_data(p, m) add_grep_list_data(p)
608 static char *add_grep_list_data(char *pattern)
609 #endif
610 {
611 grep_list_data_t *gl = xzalloc(sizeof(*gl));
612 gl->pattern = pattern;
613 #if ENABLE_FEATURE_CLEAN_UP
614 gl->flg_mem_allocated_compiled = flg_used_mem;
615 #else
616 /*gl->flg_mem_allocated_compiled = 0;*/
617 #endif
618 return (char *)gl;
619 }
620
load_regexes_from_file(llist_t * fopt)621 static void load_regexes_from_file(llist_t *fopt)
622 {
623 while (fopt) {
624 char *line;
625 FILE *fp;
626 llist_t *cur = fopt;
627 char *ffile = cur->data;
628
629 fopt = cur->link;
630 free(cur);
631 fp = xfopen_stdin(ffile);
632 while ((line = xmalloc_fgetline(fp)) != NULL) {
633 llist_add_to(&pattern_head,
634 new_grep_list_data(line, ALLOCATED));
635 }
636 fclose_if_not_stdin(fp);
637 }
638 }
639
file_action_grep(const char * filename,struct stat * statbuf UNUSED_PARAM,void * matched,int depth UNUSED_PARAM)640 static int FAST_FUNC file_action_grep(const char *filename,
641 struct stat *statbuf UNUSED_PARAM,
642 void* matched,
643 int depth UNUSED_PARAM)
644 {
645 FILE *file = fopen_for_read(filename);
646 if (file == NULL) {
647 if (!SUPPRESS_ERR_MSGS)
648 bb_simple_perror_msg(filename);
649 open_errors = 1;
650 return 0;
651 }
652 cur_file = filename;
653 *(int*)matched += grep_file(file);
654 fclose(file);
655 return 1;
656 }
657
grep_dir(const char * dir)658 static int grep_dir(const char *dir)
659 {
660 int matched = 0;
661 recursive_action(dir,
662 /* recurse=yes */ ACTION_RECURSE |
663 /* followLinks=command line only */ ACTION_FOLLOWLINKS_L0 |
664 /* depthFirst=yes */ ACTION_DEPTHFIRST,
665 /* fileAction= */ file_action_grep,
666 /* dirAction= */ NULL,
667 /* userData= */ &matched,
668 /* depth= */ 0);
669 return matched;
670 }
671
672 int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
grep_main(int argc UNUSED_PARAM,char ** argv)673 int grep_main(int argc UNUSED_PARAM, char **argv)
674 {
675 FILE *file;
676 int matched;
677 llist_t *fopt = NULL;
678 #if ENABLE_FEATURE_GREP_CONTEXT
679 int Copt, opts;
680 #endif
681 INIT_G();
682
683 /* For grep, exitcode of 1 is "not found". Other errors are 2: */
684 xfunc_error_retval = 2;
685
686 /* do normal option parsing */
687 #if ENABLE_FEATURE_GREP_CONTEXT
688 /* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
689 * -m,-A,-B,-C have numeric param */
690 opt_complementary = "H-h:C-AB";
691 opts = getopt32(argv,
692 OPTSTR_GREP,
693 &pattern_head, &fopt, &max_matches,
694 &lines_after, &lines_before, &Copt);
695
696 if (opts & OPT_C) {
697 /* -C unsets prev -A and -B, but following -A or -B
698 * may override it */
699 if (!(opts & OPT_A)) /* not overridden */
700 lines_after = Copt;
701 if (!(opts & OPT_B)) /* not overridden */
702 lines_before = Copt;
703 }
704 /* sanity checks */
705 if (opts & (OPT_c|OPT_q|OPT_l|OPT_L)) {
706 option_mask32 &= ~OPT_n;
707 lines_before = 0;
708 lines_after = 0;
709 } else if (lines_before > 0) {
710 if (lines_before > INT_MAX / sizeof(long long))
711 lines_before = INT_MAX / sizeof(long long);
712 /* overflow in (lines_before * sizeof(x)) is prevented (above) */
713 before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
714 IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
715 }
716 #else
717 /* with auto sanity checks */
718 /* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
719 opt_complementary = "H-h:c-n:q-n:l-n:";
720 getopt32(argv, OPTSTR_GREP,
721 &pattern_head, &fopt, &max_matches);
722 #endif
723 invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
724
725 { /* convert char **argv to grep_list_data_t */
726 llist_t *cur;
727 for (cur = pattern_head; cur; cur = cur->link)
728 cur->data = new_grep_list_data(cur->data, 0);
729 }
730 if (option_mask32 & OPT_f) {
731 load_regexes_from_file(fopt);
732 if (!pattern_head) { /* -f EMPTY_FILE? */
733 /* GNU grep treats it as "nothing matches" */
734 llist_add_to(&pattern_head, new_grep_list_data((char*) "", 0));
735 invert_search ^= 1;
736 }
737 }
738
739 if (ENABLE_FGREP && applet_name[0] == 'f')
740 option_mask32 |= OPT_F;
741
742 #if !ENABLE_EXTRA_COMPAT
743 if (!(option_mask32 & (OPT_o | OPT_w | OPT_x)))
744 reflags = REG_NOSUB;
745 #endif
746
747 if ((ENABLE_EGREP && applet_name[0] == 'e')
748 || (option_mask32 & OPT_E)
749 ) {
750 reflags |= REG_EXTENDED;
751 }
752 #if ENABLE_EXTRA_COMPAT
753 else {
754 reflags = RE_SYNTAX_GREP;
755 }
756 #endif
757
758 if (option_mask32 & OPT_i) {
759 #if !ENABLE_EXTRA_COMPAT
760 reflags |= REG_ICASE;
761 #else
762 int i;
763 case_fold = xmalloc(256);
764 for (i = 0; i < 256; i++)
765 case_fold[i] = (unsigned char)i;
766 for (i = 'a'; i <= 'z'; i++)
767 case_fold[i] = (unsigned char)(i - ('a' - 'A'));
768 #endif
769 }
770
771 argv += optind;
772
773 /* if we didn't get a pattern from -e and no command file was specified,
774 * first parameter should be the pattern. no pattern, no worky */
775 if (pattern_head == NULL) {
776 char *pattern;
777 if (*argv == NULL)
778 bb_show_usage();
779 pattern = new_grep_list_data(*argv++, 0);
780 llist_add_to(&pattern_head, pattern);
781 }
782
783 /* argv[0..(argc-1)] should be names of file to grep through. If
784 * there is more than one file to grep, we will print the filenames. */
785 if (argv[0] && argv[1])
786 print_filename = 1;
787 /* -H / -h of course override */
788 if (option_mask32 & OPT_H)
789 print_filename = 1;
790 if (option_mask32 & OPT_h)
791 print_filename = 0;
792
793 /* If no files were specified, or '-' was specified, take input from
794 * stdin. Otherwise, we grep through all the files specified. */
795 matched = 0;
796 do {
797 cur_file = *argv;
798 file = stdin;
799 if (!cur_file || LONE_DASH(cur_file)) {
800 cur_file = "(standard input)";
801 } else {
802 if (option_mask32 & OPT_r) {
803 struct stat st;
804 if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
805 if (!(option_mask32 & OPT_h))
806 print_filename = 1;
807 matched += grep_dir(cur_file);
808 goto grep_done;
809 }
810 }
811 /* else: fopen(dir) will succeed, but reading won't */
812 file = fopen_for_read(cur_file);
813 if (file == NULL) {
814 if (!SUPPRESS_ERR_MSGS)
815 bb_simple_perror_msg(cur_file);
816 open_errors = 1;
817 continue;
818 }
819 }
820 matched += grep_file(file);
821 fclose_if_not_stdin(file);
822 grep_done: ;
823 } while (*argv && *++argv);
824
825 /* destroy all the elments in the pattern list */
826 if (ENABLE_FEATURE_CLEAN_UP) {
827 while (pattern_head) {
828 llist_t *pattern_head_ptr = pattern_head;
829 grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data;
830
831 pattern_head = pattern_head->link;
832 if (gl->flg_mem_allocated_compiled & ALLOCATED)
833 free(gl->pattern);
834 if (gl->flg_mem_allocated_compiled & COMPILED)
835 regfree(&gl->compiled_regex);
836 free(gl);
837 free(pattern_head_ptr);
838 }
839 }
840 /* 0 = success, 1 = failed, 2 = error */
841 if (open_errors)
842 return 2;
843 return !matched; /* invert return value: 0 = success, 1 = failed */
844 }
845