Contents of /tags/mkinitrd-6_2_1/busybox/findutils/grep.c
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Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 19845 byte(s)
tagged 'mkinitrd-6_2_1'
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 the GPL v2 or later, see the file LICENSE in this tarball. |
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 | /* |
19 | * (C) 2006 Jac Goudsmit added -o option |
20 | */ |
21 | |
22 | #include "libbb.h" |
23 | #include "xregex.h" |
24 | |
25 | /* options */ |
26 | #define OPTSTR_GREP \ |
27 | "lnqvscFiHhe:f:Lorm:" \ |
28 | IF_FEATURE_GREP_CONTEXT("A:B:C:") \ |
29 | IF_FEATURE_GREP_EGREP_ALIAS("E") \ |
30 | IF_DESKTOP("w") \ |
31 | IF_EXTRA_COMPAT("z") \ |
32 | "aI" |
33 | |
34 | /* ignored: -a "assume all files to be text" */ |
35 | /* ignored: -I "assume binary files have no matches" */ |
36 | |
37 | enum { |
38 | OPTBIT_l, /* list matched file names only */ |
39 | OPTBIT_n, /* print line# */ |
40 | OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */ |
41 | OPTBIT_v, /* invert the match, to select non-matching lines */ |
42 | OPTBIT_s, /* suppress errors about file open errors */ |
43 | OPTBIT_c, /* count matches per file (suppresses normal output) */ |
44 | OPTBIT_F, /* literal match */ |
45 | OPTBIT_i, /* case-insensitive */ |
46 | OPTBIT_H, /* force filename display */ |
47 | OPTBIT_h, /* inhibit filename display */ |
48 | OPTBIT_e, /* -e PATTERN */ |
49 | OPTBIT_f, /* -f FILE_WITH_PATTERNS */ |
50 | OPTBIT_L, /* list unmatched file names only */ |
51 | OPTBIT_o, /* show only matching parts of lines */ |
52 | OPTBIT_r, /* recurse dirs */ |
53 | OPTBIT_m, /* -m MAX_MATCHES */ |
54 | IF_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */ |
55 | IF_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */ |
56 | IF_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */ |
57 | IF_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */ |
58 | IF_DESKTOP( OPTBIT_w ,) /* whole word match */ |
59 | IF_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */ |
60 | OPT_l = 1 << OPTBIT_l, |
61 | OPT_n = 1 << OPTBIT_n, |
62 | OPT_q = 1 << OPTBIT_q, |
63 | OPT_v = 1 << OPTBIT_v, |
64 | OPT_s = 1 << OPTBIT_s, |
65 | OPT_c = 1 << OPTBIT_c, |
66 | OPT_F = 1 << OPTBIT_F, |
67 | OPT_i = 1 << OPTBIT_i, |
68 | OPT_H = 1 << OPTBIT_H, |
69 | OPT_h = 1 << OPTBIT_h, |
70 | OPT_e = 1 << OPTBIT_e, |
71 | OPT_f = 1 << OPTBIT_f, |
72 | OPT_L = 1 << OPTBIT_L, |
73 | OPT_o = 1 << OPTBIT_o, |
74 | OPT_r = 1 << OPTBIT_r, |
75 | OPT_m = 1 << OPTBIT_m, |
76 | OPT_A = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0, |
77 | OPT_B = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0, |
78 | OPT_C = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0, |
79 | OPT_E = IF_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0, |
80 | OPT_w = IF_DESKTOP( (1 << OPTBIT_w)) + 0, |
81 | OPT_z = IF_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0, |
82 | }; |
83 | |
84 | #define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l) |
85 | #define PRINT_LINE_NUM (option_mask32 & OPT_n) |
86 | #define BE_QUIET (option_mask32 & OPT_q) |
87 | #define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s) |
88 | #define PRINT_MATCH_COUNTS (option_mask32 & OPT_c) |
89 | #define FGREP_FLAG (option_mask32 & OPT_F) |
90 | #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L) |
91 | #define NUL_DELIMITED (option_mask32 & OPT_z) |
92 | |
93 | struct globals { |
94 | int max_matches; |
95 | #if !ENABLE_EXTRA_COMPAT |
96 | int reflags; |
97 | #else |
98 | RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */ |
99 | #endif |
100 | smalluint invert_search; |
101 | smalluint print_filename; |
102 | smalluint open_errors; |
103 | #if ENABLE_FEATURE_GREP_CONTEXT |
104 | smalluint did_print_line; |
105 | int lines_before; |
106 | int lines_after; |
107 | char **before_buf; |
108 | IF_EXTRA_COMPAT(size_t *before_buf_size;) |
109 | int last_line_printed; |
110 | #endif |
111 | /* globals used internally */ |
112 | llist_t *pattern_head; /* growable list of patterns to match */ |
113 | const char *cur_file; /* the current file we are reading */ |
114 | }; |
115 | #define G (*(struct globals*)&bb_common_bufsiz1) |
116 | #define INIT_G() do { \ |
117 | struct G_sizecheck { \ |
118 | char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \ |
119 | }; \ |
120 | } while (0) |
121 | #define max_matches (G.max_matches ) |
122 | #if !ENABLE_EXTRA_COMPAT |
123 | # define reflags (G.reflags ) |
124 | #else |
125 | # define case_fold (G.case_fold ) |
126 | /* http://www.delorie.com/gnu/docs/regex/regex_46.html */ |
127 | # define reflags re_syntax_options |
128 | # undef REG_NOSUB |
129 | # undef REG_EXTENDED |
130 | # undef REG_ICASE |
131 | # define REG_NOSUB bug:is:here /* should not be used */ |
132 | /* Just RE_SYNTAX_EGREP is not enough, need to enable {n[,[m]]} too */ |
133 | # define REG_EXTENDED (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES) |
134 | # define REG_ICASE bug:is:here /* should not be used */ |
135 | #endif |
136 | #define invert_search (G.invert_search ) |
137 | #define print_filename (G.print_filename ) |
138 | #define open_errors (G.open_errors ) |
139 | #define did_print_line (G.did_print_line ) |
140 | #define lines_before (G.lines_before ) |
141 | #define lines_after (G.lines_after ) |
142 | #define before_buf (G.before_buf ) |
143 | #define before_buf_size (G.before_buf_size ) |
144 | #define last_line_printed (G.last_line_printed ) |
145 | #define pattern_head (G.pattern_head ) |
146 | #define cur_file (G.cur_file ) |
147 | |
148 | |
149 | typedef struct grep_list_data_t { |
150 | char *pattern; |
151 | /* for GNU regex, matched_range must be persistent across grep_file() calls */ |
152 | #if !ENABLE_EXTRA_COMPAT |
153 | regex_t compiled_regex; |
154 | regmatch_t matched_range; |
155 | #else |
156 | struct re_pattern_buffer compiled_regex; |
157 | struct re_registers matched_range; |
158 | #endif |
159 | #define ALLOCATED 1 |
160 | #define COMPILED 2 |
161 | int flg_mem_alocated_compiled; |
162 | } grep_list_data_t; |
163 | |
164 | #if !ENABLE_EXTRA_COMPAT |
165 | #define print_line(line, line_len, linenum, decoration) \ |
166 | print_line(line, linenum, decoration) |
167 | #endif |
168 | static void print_line(const char *line, size_t line_len, int linenum, char decoration) |
169 | { |
170 | #if ENABLE_FEATURE_GREP_CONTEXT |
171 | /* Happens when we go to next file, immediately hit match |
172 | * and try to print prev context... from prev file! Don't do it */ |
173 | if (linenum < 1) |
174 | return; |
175 | /* possibly print the little '--' separator */ |
176 | if ((lines_before || lines_after) && did_print_line |
177 | && last_line_printed != linenum - 1 |
178 | ) { |
179 | puts("--"); |
180 | } |
181 | /* guard against printing "--" before first line of first file */ |
182 | did_print_line = 1; |
183 | last_line_printed = linenum; |
184 | #endif |
185 | if (print_filename) |
186 | printf("%s%c", cur_file, decoration); |
187 | if (PRINT_LINE_NUM) |
188 | printf("%i%c", linenum, decoration); |
189 | /* Emulate weird GNU grep behavior with -ov */ |
190 | if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o)) { |
191 | #if !ENABLE_EXTRA_COMPAT |
192 | puts(line); |
193 | #else |
194 | fwrite(line, 1, line_len, stdout); |
195 | putchar(NUL_DELIMITED ? '\0' : '\n'); |
196 | #endif |
197 | } |
198 | } |
199 | |
200 | #if ENABLE_EXTRA_COMPAT |
201 | /* Unlike getline, this one removes trailing '\n' */ |
202 | static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file) |
203 | { |
204 | ssize_t res_sz; |
205 | char *line; |
206 | int delim = (NUL_DELIMITED ? '\0' : '\n'); |
207 | |
208 | res_sz = getdelim(line_ptr, line_alloc_len, delim, file); |
209 | line = *line_ptr; |
210 | |
211 | if (res_sz > 0) { |
212 | if (line[res_sz - 1] == delim) |
213 | line[--res_sz] = '\0'; |
214 | } else { |
215 | free(line); /* uclibc allocates a buffer even on EOF. WTF? */ |
216 | } |
217 | return res_sz; |
218 | } |
219 | #endif |
220 | |
221 | static int grep_file(FILE *file) |
222 | { |
223 | smalluint found; |
224 | int linenum = 0; |
225 | int nmatches = 0; |
226 | #if !ENABLE_EXTRA_COMPAT |
227 | char *line; |
228 | #else |
229 | char *line = NULL; |
230 | ssize_t line_len; |
231 | size_t line_alloc_len; |
232 | # define rm_so start[0] |
233 | # define rm_eo end[0] |
234 | #endif |
235 | #if ENABLE_FEATURE_GREP_CONTEXT |
236 | int print_n_lines_after = 0; |
237 | int curpos = 0; /* track where we are in the circular 'before' buffer */ |
238 | int idx = 0; /* used for iteration through the circular buffer */ |
239 | #else |
240 | enum { print_n_lines_after = 0 }; |
241 | #endif |
242 | |
243 | while ( |
244 | #if !ENABLE_EXTRA_COMPAT |
245 | (line = xmalloc_fgetline(file)) != NULL |
246 | #else |
247 | (line_len = bb_getline(&line, &line_alloc_len, file)) >= 0 |
248 | #endif |
249 | ) { |
250 | llist_t *pattern_ptr = pattern_head; |
251 | grep_list_data_t *gl = gl; /* for gcc */ |
252 | |
253 | linenum++; |
254 | found = 0; |
255 | while (pattern_ptr) { |
256 | gl = (grep_list_data_t *)pattern_ptr->data; |
257 | if (FGREP_FLAG) { |
258 | found |= (strstr(line, gl->pattern) != NULL); |
259 | } else { |
260 | if (!(gl->flg_mem_alocated_compiled & COMPILED)) { |
261 | gl->flg_mem_alocated_compiled |= COMPILED; |
262 | #if !ENABLE_EXTRA_COMPAT |
263 | xregcomp(&gl->compiled_regex, gl->pattern, reflags); |
264 | #else |
265 | memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex)); |
266 | gl->compiled_regex.translate = case_fold; /* for -i */ |
267 | if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex)) |
268 | bb_error_msg_and_die("bad regex '%s'", gl->pattern); |
269 | #endif |
270 | } |
271 | #if !ENABLE_EXTRA_COMPAT |
272 | gl->matched_range.rm_so = 0; |
273 | gl->matched_range.rm_eo = 0; |
274 | #endif |
275 | if ( |
276 | #if !ENABLE_EXTRA_COMPAT |
277 | regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0 |
278 | #else |
279 | re_search(&gl->compiled_regex, line, line_len, |
280 | /*start:*/ 0, /*range:*/ line_len, |
281 | &gl->matched_range) >= 0 |
282 | #endif |
283 | ) { |
284 | if (!(option_mask32 & OPT_w)) |
285 | found = 1; |
286 | else { |
287 | char c = ' '; |
288 | if (gl->matched_range.rm_so) |
289 | c = line[gl->matched_range.rm_so - 1]; |
290 | if (!isalnum(c) && c != '_') { |
291 | c = line[gl->matched_range.rm_eo]; |
292 | if (!c || (!isalnum(c) && c != '_')) |
293 | found = 1; |
294 | } |
295 | } |
296 | } |
297 | } |
298 | /* If it's non-inverted search, we can stop |
299 | * at first match */ |
300 | if (found && !invert_search) |
301 | goto do_found; |
302 | pattern_ptr = pattern_ptr->link; |
303 | } /* while (pattern_ptr) */ |
304 | |
305 | if (found ^ invert_search) { |
306 | do_found: |
307 | /* keep track of matches */ |
308 | nmatches++; |
309 | |
310 | /* quiet/print (non)matching file names only? */ |
311 | if (option_mask32 & (OPT_q|OPT_l|OPT_L)) { |
312 | free(line); /* we don't need line anymore */ |
313 | if (BE_QUIET) { |
314 | /* manpage says about -q: |
315 | * "exit immediately with zero status |
316 | * if any match is found, |
317 | * even if errors were detected" */ |
318 | exit(EXIT_SUCCESS); |
319 | } |
320 | /* if we're just printing filenames, we stop after the first match */ |
321 | if (PRINT_FILES_WITH_MATCHES) { |
322 | puts(cur_file); |
323 | /* fall through to "return 1" */ |
324 | } |
325 | /* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */ |
326 | return 1; /* one match */ |
327 | } |
328 | |
329 | #if ENABLE_FEATURE_GREP_CONTEXT |
330 | /* Were we printing context and saw next (unwanted) match? */ |
331 | if ((option_mask32 & OPT_m) && nmatches > max_matches) |
332 | break; |
333 | #endif |
334 | |
335 | /* print the matched line */ |
336 | if (PRINT_MATCH_COUNTS == 0) { |
337 | #if ENABLE_FEATURE_GREP_CONTEXT |
338 | int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1; |
339 | |
340 | /* if we were told to print 'before' lines and there is at least |
341 | * one line in the circular buffer, print them */ |
342 | if (lines_before && before_buf[prevpos] != NULL) { |
343 | int first_buf_entry_line_num = linenum - lines_before; |
344 | |
345 | /* advance to the first entry in the circular buffer, and |
346 | * figure out the line number is of the first line in the |
347 | * buffer */ |
348 | idx = curpos; |
349 | while (before_buf[idx] == NULL) { |
350 | idx = (idx + 1) % lines_before; |
351 | first_buf_entry_line_num++; |
352 | } |
353 | |
354 | /* now print each line in the buffer, clearing them as we go */ |
355 | while (before_buf[idx] != NULL) { |
356 | print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-'); |
357 | free(before_buf[idx]); |
358 | before_buf[idx] = NULL; |
359 | idx = (idx + 1) % lines_before; |
360 | first_buf_entry_line_num++; |
361 | } |
362 | } |
363 | |
364 | /* make a note that we need to print 'after' lines */ |
365 | print_n_lines_after = lines_after; |
366 | #endif |
367 | if (option_mask32 & OPT_o) { |
368 | if (FGREP_FLAG) { |
369 | /* -Fo just prints the pattern |
370 | * (unless -v: -Fov doesnt print anything at all) */ |
371 | if (found) |
372 | print_line(gl->pattern, strlen(gl->pattern), linenum, ':'); |
373 | } else while (1) { |
374 | unsigned end = gl->matched_range.rm_eo; |
375 | char old = line[end]; |
376 | line[end] = '\0'; |
377 | print_line(line + gl->matched_range.rm_so, |
378 | end - gl->matched_range.rm_so, |
379 | linenum, ':'); |
380 | if (old == '\0') |
381 | break; |
382 | line[end] = old; |
383 | #if !ENABLE_EXTRA_COMPAT |
384 | if (regexec(&gl->compiled_regex, line + end, |
385 | 1, &gl->matched_range, REG_NOTBOL) != 0) |
386 | break; |
387 | gl->matched_range.rm_so += end; |
388 | gl->matched_range.rm_eo += end; |
389 | #else |
390 | if (re_search(&gl->compiled_regex, line, line_len, |
391 | end, line_len - end, |
392 | &gl->matched_range) < 0) |
393 | break; |
394 | #endif |
395 | } |
396 | } else { |
397 | print_line(line, line_len, linenum, ':'); |
398 | } |
399 | } |
400 | } |
401 | #if ENABLE_FEATURE_GREP_CONTEXT |
402 | else { /* no match */ |
403 | /* if we need to print some context lines after the last match, do so */ |
404 | if (print_n_lines_after) { |
405 | print_line(line, strlen(line), linenum, '-'); |
406 | print_n_lines_after--; |
407 | } else if (lines_before) { |
408 | /* Add the line to the circular 'before' buffer */ |
409 | free(before_buf[curpos]); |
410 | before_buf[curpos] = line; |
411 | IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;) |
412 | curpos = (curpos + 1) % lines_before; |
413 | /* avoid free(line) - we took the line */ |
414 | line = NULL; |
415 | } |
416 | } |
417 | |
418 | #endif /* ENABLE_FEATURE_GREP_CONTEXT */ |
419 | #if !ENABLE_EXTRA_COMPAT |
420 | free(line); |
421 | #endif |
422 | /* Did we print all context after last requested match? */ |
423 | if ((option_mask32 & OPT_m) |
424 | && !print_n_lines_after |
425 | && nmatches == max_matches |
426 | ) { |
427 | break; |
428 | } |
429 | } /* while (read line) */ |
430 | |
431 | /* special-case file post-processing for options where we don't print line |
432 | * matches, just filenames and possibly match counts */ |
433 | |
434 | /* grep -c: print [filename:]count, even if count is zero */ |
435 | if (PRINT_MATCH_COUNTS) { |
436 | if (print_filename) |
437 | printf("%s:", cur_file); |
438 | printf("%d\n", nmatches); |
439 | } |
440 | |
441 | /* grep -L: print just the filename */ |
442 | if (PRINT_FILES_WITHOUT_MATCHES) { |
443 | /* nmatches is zero, no need to check it: |
444 | * we return 1 early if we detected a match |
445 | * and PRINT_FILES_WITHOUT_MATCHES is set */ |
446 | puts(cur_file); |
447 | } |
448 | |
449 | return nmatches; |
450 | } |
451 | |
452 | #if ENABLE_FEATURE_CLEAN_UP |
453 | #define new_grep_list_data(p, m) add_grep_list_data(p, m) |
454 | static char *add_grep_list_data(char *pattern, int flg_used_mem) |
455 | #else |
456 | #define new_grep_list_data(p, m) add_grep_list_data(p) |
457 | static char *add_grep_list_data(char *pattern) |
458 | #endif |
459 | { |
460 | grep_list_data_t *gl = xzalloc(sizeof(*gl)); |
461 | gl->pattern = pattern; |
462 | #if ENABLE_FEATURE_CLEAN_UP |
463 | gl->flg_mem_alocated_compiled = flg_used_mem; |
464 | #else |
465 | /*gl->flg_mem_alocated_compiled = 0;*/ |
466 | #endif |
467 | return (char *)gl; |
468 | } |
469 | |
470 | static void load_regexes_from_file(llist_t *fopt) |
471 | { |
472 | char *line; |
473 | FILE *f; |
474 | |
475 | while (fopt) { |
476 | llist_t *cur = fopt; |
477 | char *ffile = cur->data; |
478 | |
479 | fopt = cur->link; |
480 | free(cur); |
481 | f = xfopen_stdin(ffile); |
482 | while ((line = xmalloc_fgetline(f)) != NULL) { |
483 | llist_add_to(&pattern_head, |
484 | new_grep_list_data(line, ALLOCATED)); |
485 | } |
486 | } |
487 | } |
488 | |
489 | static int FAST_FUNC file_action_grep(const char *filename, |
490 | struct stat *statbuf UNUSED_PARAM, |
491 | void* matched, |
492 | int depth UNUSED_PARAM) |
493 | { |
494 | FILE *file = fopen_for_read(filename); |
495 | if (file == NULL) { |
496 | if (!SUPPRESS_ERR_MSGS) |
497 | bb_simple_perror_msg(filename); |
498 | open_errors = 1; |
499 | return 0; |
500 | } |
501 | cur_file = filename; |
502 | *(int*)matched += grep_file(file); |
503 | fclose(file); |
504 | return 1; |
505 | } |
506 | |
507 | static int grep_dir(const char *dir) |
508 | { |
509 | int matched = 0; |
510 | recursive_action(dir, |
511 | /* recurse=yes */ ACTION_RECURSE | |
512 | /* followLinks=no */ |
513 | /* depthFirst=yes */ ACTION_DEPTHFIRST, |
514 | /* fileAction= */ file_action_grep, |
515 | /* dirAction= */ NULL, |
516 | /* userData= */ &matched, |
517 | /* depth= */ 0); |
518 | return matched; |
519 | } |
520 | |
521 | int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
522 | int grep_main(int argc UNUSED_PARAM, char **argv) |
523 | { |
524 | FILE *file; |
525 | int matched; |
526 | llist_t *fopt = NULL; |
527 | |
528 | /* do normal option parsing */ |
529 | #if ENABLE_FEATURE_GREP_CONTEXT |
530 | int Copt; |
531 | |
532 | /* -H unsets -h; -C unsets -A,-B; -e,-f are lists; |
533 | * -m,-A,-B,-C have numeric param */ |
534 | opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+"; |
535 | getopt32(argv, |
536 | OPTSTR_GREP, |
537 | &pattern_head, &fopt, &max_matches, |
538 | &lines_after, &lines_before, &Copt); |
539 | |
540 | if (option_mask32 & OPT_C) { |
541 | /* -C unsets prev -A and -B, but following -A or -B |
542 | may override it */ |
543 | if (!(option_mask32 & OPT_A)) /* not overridden */ |
544 | lines_after = Copt; |
545 | if (!(option_mask32 & OPT_B)) /* not overridden */ |
546 | lines_before = Copt; |
547 | } |
548 | /* sanity checks */ |
549 | if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) { |
550 | option_mask32 &= ~OPT_n; |
551 | lines_before = 0; |
552 | lines_after = 0; |
553 | } else if (lines_before > 0) { |
554 | before_buf = xzalloc(lines_before * sizeof(before_buf[0])); |
555 | IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));) |
556 | } |
557 | #else |
558 | /* with auto sanity checks */ |
559 | /* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */ |
560 | opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+"; |
561 | getopt32(argv, OPTSTR_GREP, |
562 | &pattern_head, &fopt, &max_matches); |
563 | #endif |
564 | invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */ |
565 | |
566 | if (pattern_head != NULL) { |
567 | /* convert char **argv to grep_list_data_t */ |
568 | llist_t *cur; |
569 | |
570 | for (cur = pattern_head; cur; cur = cur->link) |
571 | cur->data = new_grep_list_data(cur->data, 0); |
572 | } |
573 | if (option_mask32 & OPT_f) |
574 | load_regexes_from_file(fopt); |
575 | |
576 | if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f') |
577 | option_mask32 |= OPT_F; |
578 | |
579 | #if !ENABLE_EXTRA_COMPAT |
580 | if (!(option_mask32 & (OPT_o | OPT_w))) |
581 | reflags = REG_NOSUB; |
582 | #endif |
583 | |
584 | if (ENABLE_FEATURE_GREP_EGREP_ALIAS |
585 | && (applet_name[0] == 'e' || (option_mask32 & OPT_E)) |
586 | ) { |
587 | reflags |= REG_EXTENDED; |
588 | } |
589 | #if ENABLE_EXTRA_COMPAT |
590 | else { |
591 | reflags = RE_SYNTAX_GREP; |
592 | } |
593 | #endif |
594 | |
595 | if (option_mask32 & OPT_i) { |
596 | #if !ENABLE_EXTRA_COMPAT |
597 | reflags |= REG_ICASE; |
598 | #else |
599 | int i; |
600 | case_fold = xmalloc(256); |
601 | for (i = 0; i < 256; i++) |
602 | case_fold[i] = (unsigned char)i; |
603 | for (i = 'a'; i <= 'z'; i++) |
604 | case_fold[i] = (unsigned char)(i - ('a' - 'A')); |
605 | #endif |
606 | } |
607 | |
608 | argv += optind; |
609 | |
610 | /* if we didn't get a pattern from -e and no command file was specified, |
611 | * first parameter should be the pattern. no pattern, no worky */ |
612 | if (pattern_head == NULL) { |
613 | char *pattern; |
614 | if (*argv == NULL) |
615 | bb_show_usage(); |
616 | pattern = new_grep_list_data(*argv++, 0); |
617 | llist_add_to(&pattern_head, pattern); |
618 | } |
619 | |
620 | /* argv[0..(argc-1)] should be names of file to grep through. If |
621 | * there is more than one file to grep, we will print the filenames. */ |
622 | if (argv[0] && argv[1]) |
623 | print_filename = 1; |
624 | /* -H / -h of course override */ |
625 | if (option_mask32 & OPT_H) |
626 | print_filename = 1; |
627 | if (option_mask32 & OPT_h) |
628 | print_filename = 0; |
629 | |
630 | /* If no files were specified, or '-' was specified, take input from |
631 | * stdin. Otherwise, we grep through all the files specified. */ |
632 | matched = 0; |
633 | do { |
634 | cur_file = *argv; |
635 | file = stdin; |
636 | if (!cur_file || LONE_DASH(cur_file)) { |
637 | cur_file = "(standard input)"; |
638 | } else { |
639 | if (option_mask32 & OPT_r) { |
640 | struct stat st; |
641 | if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) { |
642 | if (!(option_mask32 & OPT_h)) |
643 | print_filename = 1; |
644 | matched += grep_dir(cur_file); |
645 | goto grep_done; |
646 | } |
647 | } |
648 | /* else: fopen(dir) will succeed, but reading won't */ |
649 | file = fopen_for_read(cur_file); |
650 | if (file == NULL) { |
651 | if (!SUPPRESS_ERR_MSGS) |
652 | bb_simple_perror_msg(cur_file); |
653 | open_errors = 1; |
654 | continue; |
655 | } |
656 | } |
657 | matched += grep_file(file); |
658 | fclose_if_not_stdin(file); |
659 | grep_done: ; |
660 | } while (*argv && *++argv); |
661 | |
662 | /* destroy all the elments in the pattern list */ |
663 | if (ENABLE_FEATURE_CLEAN_UP) { |
664 | while (pattern_head) { |
665 | llist_t *pattern_head_ptr = pattern_head; |
666 | grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data; |
667 | |
668 | pattern_head = pattern_head->link; |
669 | if (gl->flg_mem_alocated_compiled & ALLOCATED) |
670 | free(gl->pattern); |
671 | if (gl->flg_mem_alocated_compiled & COMPILED) |
672 | regfree(&gl->compiled_regex); |
673 | free(gl); |
674 | free(pattern_head_ptr); |
675 | } |
676 | } |
677 | /* 0 = success, 1 = failed, 2 = error */ |
678 | if (open_errors) |
679 | return 2; |
680 | return !matched; /* invert return value: 0 = success, 1 = failed */ |
681 | } |