Context Navigation

source: MondoRescue/branches/3.0/mindi-busybox/findutils/grep.c@ 2899

Visit:

Last change on this file since 2899 was 2725, checked in by Bruno Cornec, 13 years ago
Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 23.1 KB

Line
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	//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 start = gl->matched_range.rm_so;
465	unsigned end = gl->matched_range.rm_eo;
466	unsigned len = end - start;
467	char old = line[end];
468	line[end] = '\0';
469	/* Empty match is not printed: try "echo test \| grep -o ''" */
470	if (len != 0)
471	print_line(line + start, len, linenum, ':');
472	if (old == '\0')
473	break;
474	line[end] = old;
475	if (len == 0)
476	end++;
477	#if !ENABLE_EXTRA_COMPAT
478	if (regexec(&gl->compiled_regex, line + end,
479	1, &gl->matched_range, REG_NOTBOL) != 0)
480	break;
481	gl->matched_range.rm_so += end;
482	gl->matched_range.rm_eo += end;
483	#else
484	if (re_search(&gl->compiled_regex, line, line_len,
485	end, line_len - end,
486	&gl->matched_range) < 0)
487	break;
488	#endif
489	}
490	} else {
491	print_line(line, line_len, linenum, ':');
492	}
493	}
494	}
495	#if ENABLE_FEATURE_GREP_CONTEXT
496	else { /* no match */
497	/* if we need to print some context lines after the last match, do so */
498	if (print_n_lines_after) {
499	print_line(line, strlen(line), linenum, '-');
500	print_n_lines_after--;
501	} else if (lines_before) {
502	/* Add the line to the circular 'before' buffer */
503	free(before_buf[curpos]);
504	before_buf[curpos] = line;
505	IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
506	curpos = (curpos + 1) % lines_before;
507	/* avoid free(line) - we took the line */
508	line = NULL;
509	}
510	}
511
512	#endif /* ENABLE_FEATURE_GREP_CONTEXT */
513	#if !ENABLE_EXTRA_COMPAT
514	free(line);
515	#endif
516	/* Did we print all context after last requested match? */
517	if ((option_mask32 & OPT_m)
518	&& !print_n_lines_after
519	&& nmatches == max_matches
520	) {
521	break;
522	}
523	} /* while (read line) */
524
525	/* special-case file post-processing for options where we don't print line
526	* matches, just filenames and possibly match counts */
527
528	/* grep -c: print [filename:]count, even if count is zero */
529	if (PRINT_MATCH_COUNTS) {
530	if (print_filename)
531	printf("%s:", cur_file);
532	printf("%d\n", nmatches);
533	}
534
535	/* grep -L: print just the filename */
536	if (PRINT_FILES_WITHOUT_MATCHES) {
537	/* nmatches is zero, no need to check it:
538	* we return 1 early if we detected a match
539	* and PRINT_FILES_WITHOUT_MATCHES is set */
540	puts(cur_file);
541	}
542
543	return nmatches;
544	}
545
546	#if ENABLE_FEATURE_CLEAN_UP
547	#define new_grep_list_data(p, m) add_grep_list_data(p, m)
548	static char add_grep_list_data(char pattern, int flg_used_mem)
549	#else
550	#define new_grep_list_data(p, m) add_grep_list_data(p)
551	static char add_grep_list_data(char pattern)
552	#endif
553	{
554	grep_list_data_t gl = xzalloc(sizeof(gl));
555	gl->pattern = pattern;
556	#if ENABLE_FEATURE_CLEAN_UP
557	gl->flg_mem_alocated_compiled = flg_used_mem;
558	#else
559	/gl->flg_mem_alocated_compiled = 0;/
560	#endif
561	return (char *)gl;
562	}
563
564	static void load_regexes_from_file(llist_t *fopt)
565	{
566	char *line;
567	FILE *f;
568
569	while (fopt) {
570	llist_t *cur = fopt;
571	char *ffile = cur->data;
572
573	fopt = cur->link;
574	free(cur);
575	f = xfopen_stdin(ffile);
576	while ((line = xmalloc_fgetline(f)) != NULL) {
577	llist_add_to(&pattern_head,
578	new_grep_list_data(line, ALLOCATED));
579	}
580	}
581	}
582
583	static int FAST_FUNC file_action_grep(const char *filename,
584	struct stat *statbuf UNUSED_PARAM,
585	void* matched,
586	int depth UNUSED_PARAM)
587	{
588	FILE *file = fopen_for_read(filename);
589	if (file == NULL) {
590	if (!SUPPRESS_ERR_MSGS)
591	bb_simple_perror_msg(filename);
592	open_errors = 1;
593	return 0;
594	}
595	cur_file = filename;
596	(int)matched += grep_file(file);
597	fclose(file);
598	return 1;
599	}
600
601	static int grep_dir(const char *dir)
602	{
603	int matched = 0;
604	recursive_action(dir,
605	/* recurse=yes */ ACTION_RECURSE \|
606	/* followLinks=no */
607	/* depthFirst=yes */ ACTION_DEPTHFIRST,
608	/* fileAction= */ file_action_grep,
609	/* dirAction= */ NULL,
610	/* userData= */ &matched,
611	/* depth= */ 0);
612	return matched;
613	}
614
615	int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
616	int grep_main(int argc UNUSED_PARAM, char **argv)
617	{
618	FILE *file;
619	int matched;
620	llist_t *fopt = NULL;
621
622	/* do normal option parsing */
623	#if ENABLE_FEATURE_GREP_CONTEXT
624	int Copt, opts;
625
626	/* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
627	* -m,-A,-B,-C have numeric param */
628	opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
629	opts = getopt32(argv,
630	OPTSTR_GREP,
631	&pattern_head, &fopt, &max_matches,
632	&lines_after, &lines_before, &Copt);
633
634	if (opts & OPT_C) {
635	/* -C unsets prev -A and -B, but following -A or -B
636	may override it */
637	if (!(opts & OPT_A)) /* not overridden */
638	lines_after = Copt;
639	if (!(opts & OPT_B)) /* not overridden */
640	lines_before = Copt;
641	}
642	/* sanity checks */
643	if (opts & (OPT_c\|OPT_q\|OPT_l\|OPT_L)) {
644	option_mask32 &= ~OPT_n;
645	lines_before = 0;
646	lines_after = 0;
647	} else if (lines_before > 0) {
648	if (lines_before > INT_MAX / sizeof(long long))
649	lines_before = INT_MAX / sizeof(long long);
650	/* overflow in (lines_before * sizeof(x)) is prevented (above) */
651	before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
652	IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
653	}
654	#else
655	/* with auto sanity checks */
656	/* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
657	opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+";
658	getopt32(argv, OPTSTR_GREP,
659	&pattern_head, &fopt, &max_matches);
660	#endif
661	invert_search = ((option_mask32 & OPT_v) != 0); /* 0 \| 1 */
662
663	if (pattern_head != NULL) {
664	/* convert char *argv to grep_list_data_t /
665	llist_t *cur;
666
667	for (cur = pattern_head; cur; cur = cur->link)
668	cur->data = new_grep_list_data(cur->data, 0);
669	}
670	if (option_mask32 & OPT_f)
671	load_regexes_from_file(fopt);
672
673	if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
674	option_mask32 \|= OPT_F;
675
676	#if !ENABLE_EXTRA_COMPAT
677	if (!(option_mask32 & (OPT_o \| OPT_w)))
678	reflags = REG_NOSUB;
679	#endif
680
681	if (ENABLE_FEATURE_GREP_EGREP_ALIAS
682	&& (applet_name[0] == 'e' \|\| (option_mask32 & OPT_E))
683	) {
684	reflags \|= REG_EXTENDED;
685	}
686	#if ENABLE_EXTRA_COMPAT
687	else {
688	reflags = RE_SYNTAX_GREP;
689	}
690	#endif
691
692	if (option_mask32 & OPT_i) {
693	#if !ENABLE_EXTRA_COMPAT
694	reflags \|= REG_ICASE;
695	#else
696	int i;
697	case_fold = xmalloc(256);
698	for (i = 0; i < 256; i++)
699	case_fold[i] = (unsigned char)i;
700	for (i = 'a'; i <= 'z'; i++)
701	case_fold[i] = (unsigned char)(i - ('a' - 'A'));
702	#endif
703	}
704
705	argv += optind;
706
707	/* if we didn't get a pattern from -e and no command file was specified,
708	* first parameter should be the pattern. no pattern, no worky */
709	if (pattern_head == NULL) {
710	char *pattern;
711	if (*argv == NULL)
712	bb_show_usage();
713	pattern = new_grep_list_data(*argv++, 0);
714	llist_add_to(&pattern_head, pattern);
715	}
716
717	/* argv[0..(argc-1)] should be names of file to grep through. If
718	* there is more than one file to grep, we will print the filenames. */
719	if (argv[0] && argv[1])
720	print_filename = 1;
721	/* -H / -h of course override */
722	if (option_mask32 & OPT_H)
723	print_filename = 1;
724	if (option_mask32 & OPT_h)
725	print_filename = 0;
726
727	/* If no files were specified, or '-' was specified, take input from
728	* stdin. Otherwise, we grep through all the files specified. */
729	matched = 0;
730	do {
731	cur_file = *argv;
732	file = stdin;
733	if (!cur_file \|\| LONE_DASH(cur_file)) {
734	cur_file = "(standard input)";
735	} else {
736	if (option_mask32 & OPT_r) {
737	struct stat st;
738	if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
739	if (!(option_mask32 & OPT_h))
740	print_filename = 1;
741	matched += grep_dir(cur_file);
742	goto grep_done;
743	}
744	}
745	/* else: fopen(dir) will succeed, but reading won't */
746	file = fopen_for_read(cur_file);
747	if (file == NULL) {
748	if (!SUPPRESS_ERR_MSGS)
749	bb_simple_perror_msg(cur_file);
750	open_errors = 1;
751	continue;
752	}
753	}
754	matched += grep_file(file);
755	fclose_if_not_stdin(file);
756	grep_done: ;
757	} while (argv && ++argv);
758
759	/* destroy all the elments in the pattern list */
760	if (ENABLE_FEATURE_CLEAN_UP) {
761	while (pattern_head) {
762	llist_t *pattern_head_ptr = pattern_head;
763	grep_list_data_t gl = (grep_list_data_t )pattern_head_ptr->data;
764
765	pattern_head = pattern_head->link;
766	if (gl->flg_mem_alocated_compiled & ALLOCATED)
767	free(gl->pattern);
768	if (gl->flg_mem_alocated_compiled & COMPILED)
769	regfree(&gl->compiled_regex);
770	free(gl);
771	free(pattern_head_ptr);
772	}
773	}
774	/* 0 = success, 1 = failed, 2 = error */
775	if (open_errors)
776	return 2;
777	return !matched; /* invert return value: 0 = success, 1 = failed */
778	}

Note: See TracBrowser for help on using the repository browser.

Download in other formats: