aboutsummaryrefslogtreecommitdiff
path: root/findutils/grep.c
blob: 2d886a02516eed30d4e2e40a127b50215a60eb4c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
/* vi: set sw=4 ts=4: */
/*
 * Mini grep implementation for busybox using libc regex.
 *
 * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
 * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */
/* BB_AUDIT SUSv3 defects - unsupported option -x.  */
/* BB_AUDIT GNU defects - always acts as -a.  */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/grep.html */
/*
 * 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> -
 * correction "-e pattern1 -e pattern2" logic and more optimizations.
 * precompiled regex
 */
/*
 * (C) 2006 Jac Goudsmit added -o option
 */

#include "libbb.h"
#include "xregex.h"

/* options */
#define OPTSTR_GREP \
	"lnqvscFiHhe:f:Lorm:" \
	USE_FEATURE_GREP_CONTEXT("A:B:C:") \
	USE_FEATURE_GREP_EGREP_ALIAS("E") \
	USE_DESKTOP("w") \
	"aI"
/* ignored: -a "assume all files to be text" */
/* ignored: -I "assume binary files have no matches" */

enum {
	OPTBIT_l, /* list matched file names only */
	OPTBIT_n, /* print line# */
	OPTBIT_q, /* quiet - exit(0) of first match */
	OPTBIT_v, /* invert the match, to select non-matching lines */
	OPTBIT_s, /* suppress errors about file open errors */
	OPTBIT_c, /* count matches per file (suppresses normal output) */
	OPTBIT_F, /* literal match */
	OPTBIT_i, /* case-insensitive */
	OPTBIT_H, /* force filename display */
	OPTBIT_h, /* inhibit filename display */
	OPTBIT_e, /* -e PATTERN */
	OPTBIT_f, /* -f FILE_WITH_PATTERNS */
	OPTBIT_L, /* list unmatched file names only */
	OPTBIT_o, /* show only matching parts of lines */
	OPTBIT_r, /* recurse dirs */
	OPTBIT_m, /* -m MAX_MATCHES */
	USE_FEATURE_GREP_CONTEXT(    OPTBIT_A ,) /* -A NUM: after-match context */
	USE_FEATURE_GREP_CONTEXT(    OPTBIT_B ,) /* -B NUM: before-match context */
	USE_FEATURE_GREP_CONTEXT(    OPTBIT_C ,) /* -C NUM: -A and -B combined */
	USE_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */
	USE_DESKTOP(                 OPTBIT_w ,) /* whole word match */
	OPT_l = 1 << OPTBIT_l,
	OPT_n = 1 << OPTBIT_n,
	OPT_q = 1 << OPTBIT_q,
	OPT_v = 1 << OPTBIT_v,
	OPT_s = 1 << OPTBIT_s,
	OPT_c = 1 << OPTBIT_c,
	OPT_F = 1 << OPTBIT_F,
	OPT_i = 1 << OPTBIT_i,
	OPT_H = 1 << OPTBIT_H,
	OPT_h = 1 << OPTBIT_h,
	OPT_e = 1 << OPTBIT_e,
	OPT_f = 1 << OPTBIT_f,
	OPT_L = 1 << OPTBIT_L,
	OPT_o = 1 << OPTBIT_o,
	OPT_r = 1 << OPTBIT_r,
	OPT_m = 1 << OPTBIT_m,
	OPT_A = USE_FEATURE_GREP_CONTEXT(    (1 << OPTBIT_A)) + 0,
	OPT_B = USE_FEATURE_GREP_CONTEXT(    (1 << OPTBIT_B)) + 0,
	OPT_C = USE_FEATURE_GREP_CONTEXT(    (1 << OPTBIT_C)) + 0,
	OPT_E = USE_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0,
	OPT_w = USE_DESKTOP(                 (1 << OPTBIT_w)) + 0,
};

#define PRINT_FILES_WITH_MATCHES    (option_mask32 & OPT_l)
#define PRINT_LINE_NUM              (option_mask32 & OPT_n)
#define BE_QUIET                    (option_mask32 & OPT_q)
#define SUPPRESS_ERR_MSGS           (option_mask32 & OPT_s)
#define PRINT_MATCH_COUNTS          (option_mask32 & OPT_c)
#define FGREP_FLAG                  (option_mask32 & OPT_F)
#define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)

struct globals {
	int max_matches;
	int reflags;
	smalluint invert_search;
	smalluint print_filename;
	smalluint open_errors;
#if ENABLE_FEATURE_GREP_CONTEXT
	smalluint did_print_line;
	int lines_before;
	int lines_after;
	char **before_buf;
	int last_line_printed;
#endif
	/* globals used internally */
	llist_t *pattern_head;   /* growable list of patterns to match */
	const char *cur_file;    /* the current file we are reading */
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define INIT_G() \
	do { \
		struct G_sizecheck { \
			char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
		}; \
	} while (0)
#define max_matches       (G.max_matches         )
#define reflags           (G.reflags             )
#define invert_search     (G.invert_search       )
#define print_filename    (G.print_filename      )
#define open_errors       (G.open_errors         )
#define did_print_line    (G.did_print_line      )
#define lines_before      (G.lines_before        )
#define lines_after       (G.lines_after         )
#define before_buf        (G.before_buf          )
#define last_line_printed (G.last_line_printed   )
#define pattern_head      (G.pattern_head        )
#define cur_file          (G.cur_file            )


typedef struct grep_list_data_t {
	char *pattern;
	regex_t preg;
#define PATTERN_MEM_A 1
#define COMPILED 2
	int flg_mem_alocated_compiled;
} grep_list_data_t;


static void print_line(const char *line, int linenum, char decoration)
{
#if ENABLE_FEATURE_GREP_CONTEXT
	/* Happens when we go to next file, immediately hit match
	 * and try to print prev context... from prev file! Don't do it */
	if (linenum < 1)
		return;
	/* possibly print the little '--' separator */
	if ((lines_before || lines_after) && did_print_line &&
			last_line_printed != linenum - 1) {
		puts("--");
	}
	/* guard against printing "--" before first line of first file */
	did_print_line = 1;
	last_line_printed = linenum;
#endif
	if (print_filename)
		printf("%s%c", cur_file, decoration);
	if (PRINT_LINE_NUM)
		printf("%i%c", linenum, decoration);
	/* Emulate weird GNU grep behavior with -ov */
	if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o))
		puts(line);
}

static int grep_file(FILE *file)
{
	char *line;
	smalluint found;
	int linenum = 0;
	int nmatches = 0;
	regmatch_t regmatch;
#if ENABLE_FEATURE_GREP_CONTEXT
	int print_n_lines_after = 0;
	int curpos = 0; /* track where we are in the circular 'before' buffer */
	int idx = 0; /* used for iteration through the circular buffer */
#else
	enum { print_n_lines_after = 0 };
#endif /* ENABLE_FEATURE_GREP_CONTEXT */

	while ((line = xmalloc_getline(file)) != NULL) {
		llist_t *pattern_ptr = pattern_head;
		grep_list_data_t *gl;

		linenum++;
		found = 0;
		while (pattern_ptr) {
			gl = (grep_list_data_t *)pattern_ptr->data;
			if (FGREP_FLAG) {
				found |= (strstr(line, gl->pattern) != NULL);
			} else {
				if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
					gl->flg_mem_alocated_compiled |= COMPILED;
					xregcomp(&(gl->preg), gl->pattern, reflags);
				}
				regmatch.rm_so = 0;
				regmatch.rm_eo = 0;
				if (regexec(&(gl->preg), line, 1, &regmatch, 0) == 0) {
					if (!(option_mask32 & OPT_w))
						found = 1;
					else {
						char c = ' ';
						if (regmatch.rm_so)
							c = line[regmatch.rm_so - 1];
						if (!isalnum(c) && c != '_') {
							c = line[regmatch.rm_eo];
							if (!c || (!isalnum(c) && c != '_'))
								found = 1;
						}
					}
				}
			}
			/* If it's non-inverted search, we can stop
			 * at first match */
			if (found && !invert_search)
				goto do_found;
			pattern_ptr = pattern_ptr->link;
		} /* while (pattern_ptr) */

		if (found ^ invert_search) {
 do_found:
			/* keep track of matches */
			nmatches++;

			/* quiet/print (non)matching file names only? */
			if (option_mask32 & (OPT_q|OPT_l|OPT_L)) {
				free(line); /* we don't need line anymore */
				if (BE_QUIET) {
					/* manpage says about -q:
					 * "exit immediately with zero status
					 * if any match is found,
					 * even if errors were detected" */
					exit(0);
				}
				/* if we're just printing filenames, we stop after the first match */
				if (PRINT_FILES_WITH_MATCHES) {
					puts(cur_file);
					/* fall thru to "return 1" */
				}
				/* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
				return 1; /* one match */
			}

#if ENABLE_FEATURE_GREP_CONTEXT
			/* Were we printing context and saw next (unwanted) match? */
			if ((option_mask32 & OPT_m) && nmatches > max_matches)
				break;
#endif

			/* print the matched line */
			if (PRINT_MATCH_COUNTS == 0) {
#if ENABLE_FEATURE_GREP_CONTEXT
				int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;

				/* if we were told to print 'before' lines and there is at least
				 * one line in the circular buffer, print them */
				if (lines_before && before_buf[prevpos] != NULL) {
					int first_buf_entry_line_num = linenum - lines_before;

					/* advance to the first entry in the circular buffer, and
					 * figure out the line number is of the first line in the
					 * buffer */
					idx = curpos;
					while (before_buf[idx] == NULL) {
						idx = (idx + 1) % lines_before;
						first_buf_entry_line_num++;
					}

					/* now print each line in the buffer, clearing them as we go */
					while (before_buf[idx] != NULL) {
						print_line(before_buf[idx], first_buf_entry_line_num, '-');
						free(before_buf[idx]);
						before_buf[idx] = NULL;
						idx = (idx + 1) % lines_before;
						first_buf_entry_line_num++;
					}
				}

				/* make a note that we need to print 'after' lines */
				print_n_lines_after = lines_after;
#endif
				if (option_mask32 & OPT_o) {
					line[regmatch.rm_eo] = '\0';
					print_line(line + regmatch.rm_so, linenum, ':');
				} else {
					print_line(line, linenum, ':');
				}
			}
		}
#if ENABLE_FEATURE_GREP_CONTEXT
		else { /* no match */
			/* if we need to print some context lines after the last match, do so */
			if (print_n_lines_after) {
				print_line(line, linenum, '-');
				print_n_lines_after--;
			} else if (lines_before) {
				/* Add the line to the circular 'before' buffer */
				free(before_buf[curpos]);
				before_buf[curpos] = line;
				curpos = (curpos + 1) % lines_before;
				/* avoid free(line) - we took line */
				line = NULL;
			}
		}

#endif /* ENABLE_FEATURE_GREP_CONTEXT */
		free(line);

		/* Did we print all context after last requested match? */
		if ((option_mask32 & OPT_m)
		 && !print_n_lines_after && nmatches == max_matches)
			break;
	}

	/* special-case file post-processing for options where we don't print line
	 * matches, just filenames and possibly match counts */

	/* grep -c: print [filename:]count, even if count is zero */
	if (PRINT_MATCH_COUNTS) {
		if (print_filename)
			printf("%s:", cur_file);
		printf("%d\n", nmatches);
	}

	/* grep -L: print just the filename */
	if (PRINT_FILES_WITHOUT_MATCHES) {
		/* nmatches is zero, no need to check it:
		 * we return 1 early if we detected a match
		 * and PRINT_FILES_WITHOUT_MATCHES is set */
		puts(cur_file);
	}

	return nmatches;
}

#if ENABLE_FEATURE_CLEAN_UP
#define new_grep_list_data(p, m) add_grep_list_data(p, m)
static char *add_grep_list_data(char *pattern, int flg_used_mem)
#else
#define new_grep_list_data(p, m) add_grep_list_data(p)
static char *add_grep_list_data(char *pattern)
#endif
{
	grep_list_data_t *gl = xzalloc(sizeof(*gl));
	gl->pattern = pattern;
#if ENABLE_FEATURE_CLEAN_UP
	gl->flg_mem_alocated_compiled = flg_used_mem;
#else
	/*gl->flg_mem_alocated_compiled = 0;*/
#endif
	return (char *)gl;
}

static void load_regexes_from_file(llist_t *fopt)
{
	char *line;
	FILE *f;

	while (fopt) {
		llist_t *cur = fopt;
		char *ffile = cur->data;

		fopt = cur->link;
		free(cur);
		f = xfopen(ffile, "r");
		while ((line = xmalloc_getline(f)) != NULL) {
			llist_add_to(&pattern_head,
				new_grep_list_data(line, PATTERN_MEM_A));
		}
	}
}

static int file_action_grep(const char *filename, struct stat *statbuf, void* matched, int depth)
{
	FILE *file = fopen(filename, "r");
	if (file == NULL) {
		if (!SUPPRESS_ERR_MSGS)
			bb_simple_perror_msg(cur_file);
		open_errors = 1;
		return 0;
	}
	cur_file = filename;
	*(int*)matched += grep_file(file);
	fclose(file);
	return 1;
}

static int grep_dir(const char *dir)
{
	int matched = 0;
	recursive_action(dir,
		/* recurse=yes */ ACTION_RECURSE |
		/* followLinks=no */
		/* depthFirst=yes */ ACTION_DEPTHFIRST,
		/* fileAction= */ file_action_grep,
		/* dirAction= */ NULL,
		/* userData= */ &matched,
		/* depth= */ 0);
	return matched;
}

int grep_main(int argc, char **argv);
int grep_main(int argc, char **argv)
{
	FILE *file;
	int matched;
	char *mopt;
	llist_t *fopt = NULL;

	/* do normal option parsing */
#if ENABLE_FEATURE_GREP_CONTEXT
	char *slines_after;
	char *slines_before;
	char *Copt;

	opt_complementary = "H-h:e::f::C-AB";
	getopt32(argv,
		OPTSTR_GREP,
		&pattern_head, &fopt, &mopt,
		&slines_after, &slines_before, &Copt);

	if (option_mask32 & OPT_C) {
		/* -C unsets prev -A and -B, but following -A or -B
		   may override it */
		if (!(option_mask32 & OPT_A)) /* not overridden */
			slines_after = Copt;
		if (!(option_mask32 & OPT_B)) /* not overridden */
			slines_before = Copt;
		option_mask32 |= OPT_A|OPT_B; /* for parser */
	}
	if (option_mask32 & OPT_A) {
		lines_after = xatoi_u(slines_after);
	}
	if (option_mask32 & OPT_B) {
		lines_before = xatoi_u(slines_before);
	}
	/* sanity checks */
	if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) {
		option_mask32 &= ~OPT_n;
		lines_before = 0;
		lines_after = 0;
	} else if (lines_before > 0)
		before_buf = xzalloc(lines_before * sizeof(char *));
#else
	/* with auto sanity checks */
	opt_complementary = "H-h:e::f::c-n:q-n:l-n";
	getopt32(argv, OPTSTR_GREP,
		&pattern_head, &fopt, &mopt);
#endif
	if (option_mask32 & OPT_m) {
		max_matches = xatoi_u(mopt);
	}
	invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */

	if (pattern_head != NULL) {
		/* convert char **argv to grep_list_data_t */
		llist_t *cur;

		for (cur = pattern_head; cur; cur = cur->link)
			cur->data = new_grep_list_data(cur->data, 0);
	}
	if (option_mask32 & OPT_f)
		load_regexes_from_file(fopt);

	if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
		option_mask32 |= OPT_F;

	if (!(option_mask32 & (OPT_o | OPT_w)))
		reflags = REG_NOSUB;

	if (ENABLE_FEATURE_GREP_EGREP_ALIAS
	 && (applet_name[0] == 'e' || (option_mask32 & OPT_E))
	) {
		reflags |= REG_EXTENDED;
	}

	if (option_mask32 & OPT_i)
		reflags |= REG_ICASE;

	argv += optind;
	argc -= optind;

	/* if we didn't get a pattern from a -e and no command file was specified,
	 * argv[optind] should be the pattern. no pattern, no worky */
	if (pattern_head == NULL) {
		char *pattern;
		if (*argv == NULL)
			bb_show_usage();
		pattern = new_grep_list_data(*argv++, 0);
		llist_add_to(&pattern_head, pattern);
		argc--;
	}

	/* argv[(optind)..(argc-1)] should be names of file to grep through. If
	 * there is more than one file to grep, we will print the filenames. */
	if (argc > 1)
		print_filename = 1;
	/* -H / -h of course override */
	if (option_mask32 & OPT_H)
		print_filename = 1;
	if (option_mask32 & OPT_h)
		print_filename = 0;

	/* If no files were specified, or '-' was specified, take input from
	 * stdin. Otherwise, we grep through all the files specified. */
	matched = 0;
	do {
		cur_file = *argv++;
		file = stdin;
		if (!cur_file || (*cur_file == '-' && !cur_file[1])) {
			cur_file = "(standard input)";
		} else {
			if (option_mask32 & OPT_r) {
				struct stat st;
				if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
					if (!(option_mask32 & OPT_h))
						print_filename = 1;
					matched += grep_dir(cur_file);
					goto grep_done;
				}
			}
			/* else: fopen(dir) will succeed, but reading won't */
			file = fopen(cur_file, "r");
			if (file == NULL) {
				if (!SUPPRESS_ERR_MSGS)
					bb_simple_perror_msg(cur_file);
				open_errors = 1;
				continue;
			}
		}
		matched += grep_file(file);
		fclose_if_not_stdin(file);
 grep_done: ;
	} while (--argc > 0);

	/* destroy all the elments in the pattern list */
	if (ENABLE_FEATURE_CLEAN_UP) {
		while (pattern_head) {
			llist_t *pattern_head_ptr = pattern_head;
			grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data;

			pattern_head = pattern_head->link;
			if ((gl->flg_mem_alocated_compiled & PATTERN_MEM_A))
				free(gl->pattern);
			if ((gl->flg_mem_alocated_compiled & COMPILED))
				regfree(&(gl->preg));
			free(gl);
			free(pattern_head_ptr);
		}
	}
	/* 0 = success, 1 = failed, 2 = error */
	if (open_errors)
		return 2;
	return !matched; /* invert return value: 0 = success, 1 = failed */
}