Contents of /tags/mkinitrd-6_3_2/busybox/findutils/grep.c
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 23419 byte(s)
tagged 'mkinitrd-6_3_2'
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 | * (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: "\nOptions:" |
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 -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:w" \ |
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" */ |
124 | enum { |
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 | IF_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */ |
143 | IF_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */ |
144 | IF_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */ |
145 | IF_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */ |
146 | IF_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */ |
147 | OPT_l = 1 << OPTBIT_l, |
148 | OPT_n = 1 << OPTBIT_n, |
149 | OPT_q = 1 << OPTBIT_q, |
150 | OPT_v = 1 << OPTBIT_v, |
151 | OPT_s = 1 << OPTBIT_s, |
152 | OPT_c = 1 << OPTBIT_c, |
153 | OPT_F = 1 << OPTBIT_F, |
154 | OPT_i = 1 << OPTBIT_i, |
155 | OPT_H = 1 << OPTBIT_H, |
156 | OPT_h = 1 << OPTBIT_h, |
157 | OPT_e = 1 << OPTBIT_e, |
158 | OPT_f = 1 << OPTBIT_f, |
159 | OPT_L = 1 << OPTBIT_L, |
160 | OPT_o = 1 << OPTBIT_o, |
161 | OPT_r = 1 << OPTBIT_r, |
162 | OPT_m = 1 << OPTBIT_m, |
163 | OPT_w = 1 << OPTBIT_w, |
164 | OPT_A = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0, |
165 | OPT_B = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0, |
166 | OPT_C = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0, |
167 | OPT_E = IF_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0, |
168 | OPT_z = IF_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0, |
169 | }; |
170 | |
171 | #define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l) |
172 | #define PRINT_LINE_NUM (option_mask32 & OPT_n) |
173 | #define BE_QUIET (option_mask32 & OPT_q) |
174 | #define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s) |
175 | #define PRINT_MATCH_COUNTS (option_mask32 & OPT_c) |
176 | #define FGREP_FLAG (option_mask32 & OPT_F) |
177 | #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L) |
178 | #define NUL_DELIMITED (option_mask32 & OPT_z) |
179 | |
180 | struct globals { |
181 | int max_matches; |
182 | #if !ENABLE_EXTRA_COMPAT |
183 | int reflags; |
184 | #else |
185 | RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */ |
186 | #endif |
187 | smalluint invert_search; |
188 | smalluint print_filename; |
189 | smalluint open_errors; |
190 | #if ENABLE_FEATURE_GREP_CONTEXT |
191 | smalluint did_print_line; |
192 | int lines_before; |
193 | int lines_after; |
194 | char **before_buf; |
195 | IF_EXTRA_COMPAT(size_t *before_buf_size;) |
196 | int last_line_printed; |
197 | #endif |
198 | /* globals used internally */ |
199 | llist_t *pattern_head; /* growable list of patterns to match */ |
200 | const char *cur_file; /* the current file we are reading */ |
201 | } FIX_ALIASING; |
202 | #define G (*(struct globals*)&bb_common_bufsiz1) |
203 | #define INIT_G() do { \ |
204 | struct G_sizecheck { \ |
205 | char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \ |
206 | }; \ |
207 | } while (0) |
208 | #define max_matches (G.max_matches ) |
209 | #if !ENABLE_EXTRA_COMPAT |
210 | # define reflags (G.reflags ) |
211 | #else |
212 | # define case_fold (G.case_fold ) |
213 | /* http://www.delorie.com/gnu/docs/regex/regex_46.html */ |
214 | # define reflags re_syntax_options |
215 | # undef REG_NOSUB |
216 | # undef REG_EXTENDED |
217 | # undef REG_ICASE |
218 | # define REG_NOSUB bug:is:here /* should not be used */ |
219 | /* Just RE_SYNTAX_EGREP is not enough, need to enable {n[,[m]]} too */ |
220 | # define REG_EXTENDED (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES) |
221 | # define REG_ICASE bug:is:here /* should not be used */ |
222 | #endif |
223 | #define invert_search (G.invert_search ) |
224 | #define print_filename (G.print_filename ) |
225 | #define open_errors (G.open_errors ) |
226 | #define did_print_line (G.did_print_line ) |
227 | #define lines_before (G.lines_before ) |
228 | #define lines_after (G.lines_after ) |
229 | #define before_buf (G.before_buf ) |
230 | #define before_buf_size (G.before_buf_size ) |
231 | #define last_line_printed (G.last_line_printed ) |
232 | #define pattern_head (G.pattern_head ) |
233 | #define cur_file (G.cur_file ) |
234 | |
235 | |
236 | typedef struct grep_list_data_t { |
237 | char *pattern; |
238 | /* for GNU regex, matched_range must be persistent across grep_file() calls */ |
239 | #if !ENABLE_EXTRA_COMPAT |
240 | regex_t compiled_regex; |
241 | regmatch_t matched_range; |
242 | #else |
243 | struct re_pattern_buffer compiled_regex; |
244 | struct re_registers matched_range; |
245 | #endif |
246 | #define ALLOCATED 1 |
247 | #define COMPILED 2 |
248 | int flg_mem_alocated_compiled; |
249 | } grep_list_data_t; |
250 | |
251 | #if !ENABLE_EXTRA_COMPAT |
252 | #define print_line(line, line_len, linenum, decoration) \ |
253 | print_line(line, linenum, decoration) |
254 | #endif |
255 | static void print_line(const char *line, size_t line_len, int linenum, char decoration) |
256 | { |
257 | #if ENABLE_FEATURE_GREP_CONTEXT |
258 | /* Happens when we go to next file, immediately hit match |
259 | * and try to print prev context... from prev file! Don't do it */ |
260 | if (linenum < 1) |
261 | return; |
262 | /* possibly print the little '--' separator */ |
263 | if ((lines_before || lines_after) && did_print_line |
264 | && last_line_printed != linenum - 1 |
265 | ) { |
266 | puts("--"); |
267 | } |
268 | /* guard against printing "--" before first line of first file */ |
269 | did_print_line = 1; |
270 | last_line_printed = linenum; |
271 | #endif |
272 | if (print_filename) |
273 | printf("%s%c", cur_file, decoration); |
274 | if (PRINT_LINE_NUM) |
275 | printf("%i%c", linenum, decoration); |
276 | /* Emulate weird GNU grep behavior with -ov */ |
277 | if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o)) { |
278 | #if !ENABLE_EXTRA_COMPAT |
279 | puts(line); |
280 | #else |
281 | fwrite(line, 1, line_len, stdout); |
282 | putchar(NUL_DELIMITED ? '\0' : '\n'); |
283 | #endif |
284 | } |
285 | } |
286 | |
287 | #if ENABLE_EXTRA_COMPAT |
288 | /* Unlike getline, this one removes trailing '\n' */ |
289 | static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file) |
290 | { |
291 | ssize_t res_sz; |
292 | char *line; |
293 | int delim = (NUL_DELIMITED ? '\0' : '\n'); |
294 | |
295 | res_sz = getdelim(line_ptr, line_alloc_len, delim, file); |
296 | line = *line_ptr; |
297 | |
298 | if (res_sz > 0) { |
299 | if (line[res_sz - 1] == delim) |
300 | line[--res_sz] = '\0'; |
301 | } else { |
302 | free(line); /* uclibc allocates a buffer even on EOF. WTF? */ |
303 | } |
304 | return res_sz; |
305 | } |
306 | #endif |
307 | |
308 | static int grep_file(FILE *file) |
309 | { |
310 | smalluint found; |
311 | int linenum = 0; |
312 | int nmatches = 0; |
313 | #if !ENABLE_EXTRA_COMPAT |
314 | char *line; |
315 | #else |
316 | char *line = NULL; |
317 | ssize_t line_len; |
318 | size_t line_alloc_len; |
319 | # define rm_so start[0] |
320 | # define rm_eo end[0] |
321 | #endif |
322 | #if ENABLE_FEATURE_GREP_CONTEXT |
323 | int print_n_lines_after = 0; |
324 | int curpos = 0; /* track where we are in the circular 'before' buffer */ |
325 | int idx = 0; /* used for iteration through the circular buffer */ |
326 | #else |
327 | enum { print_n_lines_after = 0 }; |
328 | #endif |
329 | |
330 | while ( |
331 | #if !ENABLE_EXTRA_COMPAT |
332 | (line = xmalloc_fgetline(file)) != NULL |
333 | #else |
334 | (line_len = bb_getline(&line, &line_alloc_len, file)) >= 0 |
335 | #endif |
336 | ) { |
337 | llist_t *pattern_ptr = pattern_head; |
338 | grep_list_data_t *gl = gl; /* for gcc */ |
339 | |
340 | linenum++; |
341 | found = 0; |
342 | while (pattern_ptr) { |
343 | gl = (grep_list_data_t *)pattern_ptr->data; |
344 | if (FGREP_FLAG) { |
345 | found |= (((option_mask32 & OPT_i) |
346 | ? strcasestr(line, gl->pattern) |
347 | : strstr(line, gl->pattern) |
348 | ) != NULL); |
349 | } else { |
350 | if (!(gl->flg_mem_alocated_compiled & COMPILED)) { |
351 | gl->flg_mem_alocated_compiled |= COMPILED; |
352 | #if !ENABLE_EXTRA_COMPAT |
353 | xregcomp(&gl->compiled_regex, gl->pattern, reflags); |
354 | #else |
355 | memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex)); |
356 | gl->compiled_regex.translate = case_fold; /* for -i */ |
357 | if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex)) |
358 | bb_error_msg_and_die("bad regex '%s'", gl->pattern); |
359 | #endif |
360 | } |
361 | #if !ENABLE_EXTRA_COMPAT |
362 | gl->matched_range.rm_so = 0; |
363 | gl->matched_range.rm_eo = 0; |
364 | #endif |
365 | if ( |
366 | #if !ENABLE_EXTRA_COMPAT |
367 | regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0 |
368 | #else |
369 | re_search(&gl->compiled_regex, line, line_len, |
370 | /*start:*/ 0, /*range:*/ line_len, |
371 | &gl->matched_range) >= 0 |
372 | #endif |
373 | ) { |
374 | if (!(option_mask32 & OPT_w)) |
375 | found = 1; |
376 | else { |
377 | char c = ' '; |
378 | if (gl->matched_range.rm_so) |
379 | c = line[gl->matched_range.rm_so - 1]; |
380 | if (!isalnum(c) && c != '_') { |
381 | c = line[gl->matched_range.rm_eo]; |
382 | if (!c || (!isalnum(c) && c != '_')) |
383 | found = 1; |
384 | } |
385 | } |
386 | } |
387 | } |
388 | /* If it's non-inverted search, we can stop |
389 | * at first match */ |
390 | if (found && !invert_search) |
391 | goto do_found; |
392 | pattern_ptr = pattern_ptr->link; |
393 | } /* while (pattern_ptr) */ |
394 | |
395 | if (found ^ invert_search) { |
396 | do_found: |
397 | /* keep track of matches */ |
398 | nmatches++; |
399 | |
400 | /* quiet/print (non)matching file names only? */ |
401 | if (option_mask32 & (OPT_q|OPT_l|OPT_L)) { |
402 | free(line); /* we don't need line anymore */ |
403 | if (BE_QUIET) { |
404 | /* manpage says about -q: |
405 | * "exit immediately with zero status |
406 | * if any match is found, |
407 | * even if errors were detected" */ |
408 | exit(EXIT_SUCCESS); |
409 | } |
410 | /* if we're just printing filenames, we stop after the first match */ |
411 | if (PRINT_FILES_WITH_MATCHES) { |
412 | puts(cur_file); |
413 | /* fall through to "return 1" */ |
414 | } |
415 | /* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */ |
416 | return 1; /* one match */ |
417 | } |
418 | |
419 | #if ENABLE_FEATURE_GREP_CONTEXT |
420 | /* Were we printing context and saw next (unwanted) match? */ |
421 | if ((option_mask32 & OPT_m) && nmatches > max_matches) |
422 | break; |
423 | #endif |
424 | |
425 | /* print the matched line */ |
426 | if (PRINT_MATCH_COUNTS == 0) { |
427 | #if ENABLE_FEATURE_GREP_CONTEXT |
428 | int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1; |
429 | |
430 | /* if we were told to print 'before' lines and there is at least |
431 | * one line in the circular buffer, print them */ |
432 | if (lines_before && before_buf[prevpos] != NULL) { |
433 | int first_buf_entry_line_num = linenum - lines_before; |
434 | |
435 | /* advance to the first entry in the circular buffer, and |
436 | * figure out the line number is of the first line in the |
437 | * buffer */ |
438 | idx = curpos; |
439 | while (before_buf[idx] == NULL) { |
440 | idx = (idx + 1) % lines_before; |
441 | first_buf_entry_line_num++; |
442 | } |
443 | |
444 | /* now print each line in the buffer, clearing them as we go */ |
445 | while (before_buf[idx] != NULL) { |
446 | print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-'); |
447 | free(before_buf[idx]); |
448 | before_buf[idx] = NULL; |
449 | idx = (idx + 1) % lines_before; |
450 | first_buf_entry_line_num++; |
451 | } |
452 | } |
453 | |
454 | /* make a note that we need to print 'after' lines */ |
455 | print_n_lines_after = lines_after; |
456 | #endif |
457 | if (option_mask32 & OPT_o) { |
458 | if (FGREP_FLAG) { |
459 | /* -Fo just prints the pattern |
460 | * (unless -v: -Fov doesnt print anything at all) */ |
461 | if (found) |
462 | print_line(gl->pattern, strlen(gl->pattern), linenum, ':'); |
463 | } else while (1) { |
464 | unsigned end = gl->matched_range.rm_eo; |
465 | char old = line[end]; |
466 | line[end] = '\0'; |
467 | print_line(line + gl->matched_range.rm_so, |
468 | end - gl->matched_range.rm_so, |
469 | linenum, ':'); |
470 | if (old == '\0') |
471 | break; |
472 | line[end] = old; |
473 | #if !ENABLE_EXTRA_COMPAT |
474 | if (regexec(&gl->compiled_regex, line + end, |
475 | 1, &gl->matched_range, REG_NOTBOL) != 0) |
476 | break; |
477 | gl->matched_range.rm_so += end; |
478 | gl->matched_range.rm_eo += end; |
479 | #else |
480 | if (re_search(&gl->compiled_regex, line, line_len, |
481 | end, line_len - end, |
482 | &gl->matched_range) < 0) |
483 | break; |
484 | #endif |
485 | } |
486 | } else { |
487 | print_line(line, line_len, linenum, ':'); |
488 | } |
489 | } |
490 | } |
491 | #if ENABLE_FEATURE_GREP_CONTEXT |
492 | else { /* no match */ |
493 | /* if we need to print some context lines after the last match, do so */ |
494 | if (print_n_lines_after) { |
495 | print_line(line, strlen(line), linenum, '-'); |
496 | print_n_lines_after--; |
497 | } else if (lines_before) { |
498 | /* Add the line to the circular 'before' buffer */ |
499 | free(before_buf[curpos]); |
500 | before_buf[curpos] = line; |
501 | IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;) |
502 | curpos = (curpos + 1) % lines_before; |
503 | /* avoid free(line) - we took the line */ |
504 | line = NULL; |
505 | } |
506 | } |
507 | |
508 | #endif /* ENABLE_FEATURE_GREP_CONTEXT */ |
509 | #if !ENABLE_EXTRA_COMPAT |
510 | free(line); |
511 | #endif |
512 | /* Did we print all context after last requested match? */ |
513 | if ((option_mask32 & OPT_m) |
514 | && !print_n_lines_after |
515 | && nmatches == max_matches |
516 | ) { |
517 | break; |
518 | } |
519 | } /* while (read line) */ |
520 | |
521 | /* special-case file post-processing for options where we don't print line |
522 | * matches, just filenames and possibly match counts */ |
523 | |
524 | /* grep -c: print [filename:]count, even if count is zero */ |
525 | if (PRINT_MATCH_COUNTS) { |
526 | if (print_filename) |
527 | printf("%s:", cur_file); |
528 | printf("%d\n", nmatches); |
529 | } |
530 | |
531 | /* grep -L: print just the filename */ |
532 | if (PRINT_FILES_WITHOUT_MATCHES) { |
533 | /* nmatches is zero, no need to check it: |
534 | * we return 1 early if we detected a match |
535 | * and PRINT_FILES_WITHOUT_MATCHES is set */ |
536 | puts(cur_file); |
537 | } |
538 | |
539 | return nmatches; |
540 | } |
541 | |
542 | #if ENABLE_FEATURE_CLEAN_UP |
543 | #define new_grep_list_data(p, m) add_grep_list_data(p, m) |
544 | static char *add_grep_list_data(char *pattern, int flg_used_mem) |
545 | #else |
546 | #define new_grep_list_data(p, m) add_grep_list_data(p) |
547 | static char *add_grep_list_data(char *pattern) |
548 | #endif |
549 | { |
550 | grep_list_data_t *gl = xzalloc(sizeof(*gl)); |
551 | gl->pattern = pattern; |
552 | #if ENABLE_FEATURE_CLEAN_UP |
553 | gl->flg_mem_alocated_compiled = flg_used_mem; |
554 | #else |
555 | /*gl->flg_mem_alocated_compiled = 0;*/ |
556 | #endif |
557 | return (char *)gl; |
558 | } |
559 | |
560 | static void load_regexes_from_file(llist_t *fopt) |
561 | { |
562 | char *line; |
563 | FILE *f; |
564 | |
565 | while (fopt) { |
566 | llist_t *cur = fopt; |
567 | char *ffile = cur->data; |
568 | |
569 | fopt = cur->link; |
570 | free(cur); |
571 | f = xfopen_stdin(ffile); |
572 | while ((line = xmalloc_fgetline(f)) != NULL) { |
573 | llist_add_to(&pattern_head, |
574 | new_grep_list_data(line, ALLOCATED)); |
575 | } |
576 | } |
577 | } |
578 | |
579 | static int FAST_FUNC file_action_grep(const char *filename, |
580 | struct stat *statbuf UNUSED_PARAM, |
581 | void* matched, |
582 | int depth UNUSED_PARAM) |
583 | { |
584 | FILE *file = fopen_for_read(filename); |
585 | if (file == NULL) { |
586 | if (!SUPPRESS_ERR_MSGS) |
587 | bb_simple_perror_msg(filename); |
588 | open_errors = 1; |
589 | return 0; |
590 | } |
591 | cur_file = filename; |
592 | *(int*)matched += grep_file(file); |
593 | fclose(file); |
594 | return 1; |
595 | } |
596 | |
597 | static int grep_dir(const char *dir) |
598 | { |
599 | int matched = 0; |
600 | recursive_action(dir, |
601 | /* recurse=yes */ ACTION_RECURSE | |
602 | /* followLinks=no */ |
603 | /* depthFirst=yes */ ACTION_DEPTHFIRST, |
604 | /* fileAction= */ file_action_grep, |
605 | /* dirAction= */ NULL, |
606 | /* userData= */ &matched, |
607 | /* depth= */ 0); |
608 | return matched; |
609 | } |
610 | |
611 | int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
612 | int grep_main(int argc UNUSED_PARAM, char **argv) |
613 | { |
614 | FILE *file; |
615 | int matched; |
616 | llist_t *fopt = NULL; |
617 | |
618 | /* do normal option parsing */ |
619 | #if ENABLE_FEATURE_GREP_CONTEXT |
620 | int Copt; |
621 | |
622 | /* -H unsets -h; -C unsets -A,-B; -e,-f are lists; |
623 | * -m,-A,-B,-C have numeric param */ |
624 | opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+"; |
625 | getopt32(argv, |
626 | OPTSTR_GREP, |
627 | &pattern_head, &fopt, &max_matches, |
628 | &lines_after, &lines_before, &Copt); |
629 | |
630 | if (option_mask32 & OPT_C) { |
631 | /* -C unsets prev -A and -B, but following -A or -B |
632 | may override it */ |
633 | if (!(option_mask32 & OPT_A)) /* not overridden */ |
634 | lines_after = Copt; |
635 | if (!(option_mask32 & OPT_B)) /* not overridden */ |
636 | lines_before = Copt; |
637 | } |
638 | /* sanity checks */ |
639 | if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) { |
640 | option_mask32 &= ~OPT_n; |
641 | lines_before = 0; |
642 | lines_after = 0; |
643 | } else if (lines_before > 0) { |
644 | before_buf = xzalloc(lines_before * sizeof(before_buf[0])); |
645 | IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));) |
646 | } |
647 | #else |
648 | /* with auto sanity checks */ |
649 | /* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */ |
650 | opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+"; |
651 | getopt32(argv, OPTSTR_GREP, |
652 | &pattern_head, &fopt, &max_matches); |
653 | #endif |
654 | invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */ |
655 | |
656 | if (pattern_head != NULL) { |
657 | /* convert char **argv to grep_list_data_t */ |
658 | llist_t *cur; |
659 | |
660 | for (cur = pattern_head; cur; cur = cur->link) |
661 | cur->data = new_grep_list_data(cur->data, 0); |
662 | } |
663 | if (option_mask32 & OPT_f) |
664 | load_regexes_from_file(fopt); |
665 | |
666 | if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f') |
667 | option_mask32 |= OPT_F; |
668 | |
669 | #if !ENABLE_EXTRA_COMPAT |
670 | if (!(option_mask32 & (OPT_o | OPT_w))) |
671 | reflags = REG_NOSUB; |
672 | #endif |
673 | |
674 | if (ENABLE_FEATURE_GREP_EGREP_ALIAS |
675 | && (applet_name[0] == 'e' || (option_mask32 & OPT_E)) |
676 | ) { |
677 | reflags |= REG_EXTENDED; |
678 | } |
679 | #if ENABLE_EXTRA_COMPAT |
680 | else { |
681 | reflags = RE_SYNTAX_GREP; |
682 | } |
683 | #endif |
684 | |
685 | if (option_mask32 & OPT_i) { |
686 | #if !ENABLE_EXTRA_COMPAT |
687 | reflags |= REG_ICASE; |
688 | #else |
689 | int i; |
690 | case_fold = xmalloc(256); |
691 | for (i = 0; i < 256; i++) |
692 | case_fold[i] = (unsigned char)i; |
693 | for (i = 'a'; i <= 'z'; i++) |
694 | case_fold[i] = (unsigned char)(i - ('a' - 'A')); |
695 | #endif |
696 | } |
697 | |
698 | argv += optind; |
699 | |
700 | /* if we didn't get a pattern from -e and no command file was specified, |
701 | * first parameter should be the pattern. no pattern, no worky */ |
702 | if (pattern_head == NULL) { |
703 | char *pattern; |
704 | if (*argv == NULL) |
705 | bb_show_usage(); |
706 | pattern = new_grep_list_data(*argv++, 0); |
707 | llist_add_to(&pattern_head, pattern); |
708 | } |
709 | |
710 | /* argv[0..(argc-1)] should be names of file to grep through. If |
711 | * there is more than one file to grep, we will print the filenames. */ |
712 | if (argv[0] && argv[1]) |
713 | print_filename = 1; |
714 | /* -H / -h of course override */ |
715 | if (option_mask32 & OPT_H) |
716 | print_filename = 1; |
717 | if (option_mask32 & OPT_h) |
718 | print_filename = 0; |
719 | |
720 | /* If no files were specified, or '-' was specified, take input from |
721 | * stdin. Otherwise, we grep through all the files specified. */ |
722 | matched = 0; |
723 | do { |
724 | cur_file = *argv; |
725 | file = stdin; |
726 | if (!cur_file || LONE_DASH(cur_file)) { |
727 | cur_file = "(standard input)"; |
728 | } else { |
729 | if (option_mask32 & OPT_r) { |
730 | struct stat st; |
731 | if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) { |
732 | if (!(option_mask32 & OPT_h)) |
733 | print_filename = 1; |
734 | matched += grep_dir(cur_file); |
735 | goto grep_done; |
736 | } |
737 | } |
738 | /* else: fopen(dir) will succeed, but reading won't */ |
739 | file = fopen_for_read(cur_file); |
740 | if (file == NULL) { |
741 | if (!SUPPRESS_ERR_MSGS) |
742 | bb_simple_perror_msg(cur_file); |
743 | open_errors = 1; |
744 | continue; |
745 | } |
746 | } |
747 | matched += grep_file(file); |
748 | fclose_if_not_stdin(file); |
749 | grep_done: ; |
750 | } while (*argv && *++argv); |
751 | |
752 | /* destroy all the elments in the pattern list */ |
753 | if (ENABLE_FEATURE_CLEAN_UP) { |
754 | while (pattern_head) { |
755 | llist_t *pattern_head_ptr = pattern_head; |
756 | grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data; |
757 | |
758 | pattern_head = pattern_head->link; |
759 | if (gl->flg_mem_alocated_compiled & ALLOCATED) |
760 | free(gl->pattern); |
761 | if (gl->flg_mem_alocated_compiled & COMPILED) |
762 | regfree(&gl->compiled_regex); |
763 | free(gl); |
764 | free(pattern_head_ptr); |
765 | } |
766 | } |
767 | /* 0 = success, 1 = failed, 2 = error */ |
768 | if (open_errors) |
769 | return 2; |
770 | return !matched; /* invert return value: 0 = success, 1 = failed */ |
771 | } |