Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  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
/* 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:Lor" \
	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,
	OPTBIT_n,
	OPTBIT_q,
	OPTBIT_v,
	OPTBIT_s,
	OPTBIT_c,
	OPTBIT_F,
	OPTBIT_i,
	OPTBIT_H,
	OPTBIT_h,
	OPTBIT_e,
	OPTBIT_f,
	OPTBIT_L,
	OPTBIT_o,
	OPTBIT_r,
	USE_FEATURE_GREP_CONTEXT(    OPTBIT_A ,)
	USE_FEATURE_GREP_CONTEXT(    OPTBIT_B ,)
	USE_FEATURE_GREP_CONTEXT(    OPTBIT_C ,)
	USE_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,)
	USE_DESKTOP(                 OPTBIT_w ,)
	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_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)

typedef unsigned char byte_t;

static int reflags;
static byte_t invert_search;
static byte_t print_filename;
static byte_t open_errors;

#if ENABLE_FEATURE_GREP_CONTEXT
static int lines_before;
static int lines_after;
static char **before_buf;
static int last_line_printed;
#endif /* ENABLE_FEATURE_GREP_CONTEXT */

/* globals used internally */
static llist_t *pattern_head;   /* growable list of patterns to match */
static const char *cur_file;    /* the current file we are reading */

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
	/* possibly print the little '--' separator */
	if ((lines_before || lines_after) && last_line_printed &&
			last_line_printed < linenum - 1) {
		puts("--");
	}
	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;
	byte_t ret;
	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 */
#endif /* ENABLE_FEATURE_GREP_CONTEXT */

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

		linenum++;
		ret = 0;
		while (pattern_ptr) {
			gl = (grep_list_data_t *)pattern_ptr->data;
			if (FGREP_FLAG) {
				ret = strstr(line, gl->pattern) != NULL;
			} else {
				/*
				 * test for a postitive-assertion match (regexec returns success (0)
				 * and the user did not specify invert search), or a negative-assertion
				 * match (regexec returns failure (REG_NOMATCH) and the user specified
				 * invert search)
				 */
				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))
						ret = 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 != '_'))
								ret = 1;
						}
					}
				}
			}
			pattern_ptr = pattern_ptr->link;
		} /* while (pattern_ptr) */

		if (ret ^ invert_search) {
			if (PRINT_FILES_WITH_MATCHES || BE_QUIET)
				free(line);

			/* if we found a match but were told to be quiet, stop here */
			if (BE_QUIET || PRINT_FILES_WITHOUT_MATCHES)
				return -1;

			/* keep track of matches */
			nmatches++;

			/* if we're just printing filenames, we stop after the first match */
			if (PRINT_FILES_WITH_MATCHES)
				break;

			/* 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 */
			/* Add the line to the circular 'before' buffer */
			if (lines_before) {
				free(before_buf[curpos]);
				before_buf[curpos] = xstrdup(line);
				curpos = (curpos + 1) % lines_before;
			}
		}

		/* if we need to print some context lines after the last match, do so */
		if (print_n_lines_after && (last_line_printed != linenum)) {
			print_line(line, linenum, '-');
			print_n_lines_after--;
		}
#endif /* ENABLE_FEATURE_GREP_CONTEXT */
		free(line);
	}

	/* 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, but only if we grepped the line in the file  */
	if (PRINT_FILES_WITH_MATCHES && nmatches > 0) {
		puts(cur_file);
	}

	/* grep -L: print just the filename, but only if we didn't grep the line in the file  */
	if (PRINT_FILES_WITHOUT_MATCHES && nmatches == 0) {
		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 = xmalloc(sizeof(grep_list_data_t));
	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_perror_msg("%s", 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;
	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(argc, argv,
		OPTSTR_GREP,
		&pattern_head, &fopt,
		&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(argc, argv, OPTSTR_GREP,
		&pattern_head, &fopt);
#endif
	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. */
	if (argc == 0)
		argc++;
	matched = 0;
	while (argc--) {
		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_perror_msg("%s", cur_file);
				open_errors = 1;
				continue;
			}
		}
		matched += grep_file(file);
		fclose_if_not_stdin(file);
 grep_done:
		if (matched < 0) {
			/* we found a match but were told to be quiet, stop here and
			* return success */
			break;
		}
	}

	/* 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 the -q option is specified, the exit status shall be zero
	 * if an input line is selected, even if an error was detected.  */
	if (BE_QUIET && matched)
		return 0;
	if (open_errors)
		return 2;
	return !matched; /* invert return value 0 = success, 1 = failed */
}