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grep.c

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Last change on this file was 3232, checked in by Bruno Cornec, 10 years ago
Update mindi-busybox to 1.21.1
File size: 24.2 KB

Rev	Line
[821]	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	*
[2725]	8	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
[821]	9	*/
[2725]	10	/* BB_AUDIT SUSv3 defects - unsupported option -x "match whole line only". */
[821]	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
[2725]	17	*
[1765]	18	* (C) 2006 Jac Goudsmit added -o option
	19	*/
[821]	20
[3232]	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))
[2725]	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
[1765]	60	#include "libbb.h"
[821]	61	#include "xregex.h"
	62
[2725]	63
[821]	64	/* options */
[2725]	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: "\n -H Add 'filename:' prefix"
	76	//usage: "\n -h Do not add 'filename:' prefix"
	77	//usage: "\n -n Add 'line_no:' prefix"
	78	//usage: "\n -l Show only names of files that match"
	79	//usage: "\n -L Show only names of files that don't match"
	80	//usage: "\n -c Show only count of matching lines"
	81	//usage: "\n -o Show only the matching part of line"
	82	//usage: "\n -q Quiet. Return 0 if PATTERN is found, 1 otherwise"
	83	//usage: "\n -v Select non-matching lines"
	84	//usage: "\n -s Suppress open and read errors"
	85	//usage: "\n -r Recurse"
	86	//usage: "\n -i Ignore case"
	87	//usage: "\n -w Match whole words only"
[3232]	88	//usage: "\n -x Match whole lines only"
[2725]	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
[1765]	116	#define OPTSTR_GREP \
[3232]	117	"lnqvscFiHhe:f:Lorm:wx" \
[2725]	118	IF_FEATURE_GREP_CONTEXT("A:B:C:") \
	119	IF_FEATURE_GREP_EGREP_ALIAS("E") \
	120	IF_EXTRA_COMPAT("z") \
[1765]	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# */
[2725]	127	OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */
[1765]	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 */
[2725]	141	OPTBIT_w, /* -w whole word match */
[3232]	142	OPTBIT_x, /* -x whole line match */
[2725]	143	IF_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */
	144	IF_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */
	145	IF_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */
	146	IF_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */
	147	IF_EXTRA_COMPAT( OPTBIT_z ,) /* input is NUL terminated */
[1765]	148	OPT_l = 1 << OPTBIT_l,
	149	OPT_n = 1 << OPTBIT_n,
	150	OPT_q = 1 << OPTBIT_q,
	151	OPT_v = 1 << OPTBIT_v,
	152	OPT_s = 1 << OPTBIT_s,
	153	OPT_c = 1 << OPTBIT_c,
	154	OPT_F = 1 << OPTBIT_F,
	155	OPT_i = 1 << OPTBIT_i,
	156	OPT_H = 1 << OPTBIT_H,
	157	OPT_h = 1 << OPTBIT_h,
	158	OPT_e = 1 << OPTBIT_e,
	159	OPT_f = 1 << OPTBIT_f,
	160	OPT_L = 1 << OPTBIT_L,
	161	OPT_o = 1 << OPTBIT_o,
	162	OPT_r = 1 << OPTBIT_r,
	163	OPT_m = 1 << OPTBIT_m,
[2725]	164	OPT_w = 1 << OPTBIT_w,
[3232]	165	OPT_x = 1 << OPTBIT_x,
[2725]	166	OPT_A = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0,
	167	OPT_B = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0,
	168	OPT_C = IF_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0,
	169	OPT_E = IF_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0,
	170	OPT_z = IF_EXTRA_COMPAT( (1 << OPTBIT_z)) + 0,
[1765]	171	};
	172
	173	#define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l)
	174	#define PRINT_LINE_NUM (option_mask32 & OPT_n)
	175	#define BE_QUIET (option_mask32 & OPT_q)
	176	#define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s)
	177	#define PRINT_MATCH_COUNTS (option_mask32 & OPT_c)
	178	#define FGREP_FLAG (option_mask32 & OPT_F)
	179	#define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
[2725]	180	#define NUL_DELIMITED (option_mask32 & OPT_z)
[1765]	181
[2725]	182	struct globals {
	183	int max_matches;
	184	#if !ENABLE_EXTRA_COMPAT
	185	int reflags;
	186	#else
	187	RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */
	188	#endif
	189	smalluint invert_search;
	190	smalluint print_filename;
	191	smalluint open_errors;
	192	#if ENABLE_FEATURE_GREP_CONTEXT
	193	smalluint did_print_line;
	194	int lines_before;
	195	int lines_after;
	196	char **before_buf;
	197	IF_EXTRA_COMPAT(size_t *before_buf_size;)
	198	int last_line_printed;
	199	#endif
	200	/* globals used internally */
	201	llist_t pattern_head; / growable list of patterns to match */
	202	const char cur_file; / the current file we are reading */
	203	} FIX_ALIASING;
	204	#define G ((struct globals)&bb_common_bufsiz1)
	205	#define INIT_G() do { \
	206	struct G_sizecheck { \
	207	char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
	208	}; \
	209	} while (0)
	210	#define max_matches (G.max_matches )
	211	#if !ENABLE_EXTRA_COMPAT
	212	# define reflags (G.reflags )
	213	#else
	214	# define case_fold (G.case_fold )
	215	/* http://www.delorie.com/gnu/docs/regex/regex_46.html */
	216	# define reflags re_syntax_options
	217	# undef REG_NOSUB
	218	# undef REG_EXTENDED
	219	# undef REG_ICASE
	220	# define REG_NOSUB bug:is:here /* should not be used */
	221	/* Just RE_SYNTAX_EGREP is not enough, need to enable {n[,[m]]} too */
	222	# define REG_EXTENDED (RE_SYNTAX_EGREP \| RE_INTERVALS \| RE_NO_BK_BRACES)
	223	# define REG_ICASE bug:is:here /* should not be used */
	224	#endif
	225	#define invert_search (G.invert_search )
	226	#define print_filename (G.print_filename )
	227	#define open_errors (G.open_errors )
	228	#define did_print_line (G.did_print_line )
	229	#define lines_before (G.lines_before )
	230	#define lines_after (G.lines_after )
	231	#define before_buf (G.before_buf )
	232	#define before_buf_size (G.before_buf_size )
	233	#define last_line_printed (G.last_line_printed )
	234	#define pattern_head (G.pattern_head )
	235	#define cur_file (G.cur_file )
[1765]	236
[821]	237
[1765]	238	typedef struct grep_list_data_t {
[821]	239	char *pattern;
[2725]	240	/* for GNU regex, matched_range must be persistent across grep_file() calls */
	241	#if !ENABLE_EXTRA_COMPAT
	242	regex_t compiled_regex;
	243	regmatch_t matched_range;
	244	#else
	245	struct re_pattern_buffer compiled_regex;
	246	struct re_registers matched_range;
	247	#endif
	248	#define ALLOCATED 1
[821]	249	#define COMPILED 2
	250	int flg_mem_alocated_compiled;
	251	} grep_list_data_t;
	252
[2725]	253	#if !ENABLE_EXTRA_COMPAT
	254	#define print_line(line, line_len, linenum, decoration) \
	255	print_line(line, linenum, decoration)
	256	#endif
	257	static void print_line(const char *line, size_t line_len, int linenum, char decoration)
[821]	258	{
	259	#if ENABLE_FEATURE_GREP_CONTEXT
[1765]	260	/* Happens when we go to next file, immediately hit match
	261	* and try to print prev context... from prev file! Don't do it */
	262	if (linenum < 1)
	263	return;
[821]	264	/* possibly print the little '--' separator */
[2725]	265	if ((lines_before \|\| lines_after) && did_print_line
	266	&& last_line_printed != linenum - 1
	267	) {
[821]	268	puts("--");
	269	}
[1765]	270	/* guard against printing "--" before first line of first file */
	271	did_print_line = 1;
[821]	272	last_line_printed = linenum;
	273	#endif
[1765]	274	if (print_filename)
[821]	275	printf("%s%c", cur_file, decoration);
	276	if (PRINT_LINE_NUM)
	277	printf("%i%c", linenum, decoration);
[1765]	278	/* Emulate weird GNU grep behavior with -ov */
[2725]	279	if ((option_mask32 & (OPT_v\|OPT_o)) != (OPT_v\|OPT_o)) {
	280	#if !ENABLE_EXTRA_COMPAT
[1765]	281	puts(line);
[2725]	282	#else
	283	fwrite(line, 1, line_len, stdout);
	284	putchar(NUL_DELIMITED ? '\0' : '\n');
	285	#endif
	286	}
[821]	287	}
	288
[2725]	289	#if ENABLE_EXTRA_COMPAT
	290	/* Unlike getline, this one removes trailing '\n' */
	291	static ssize_t FAST_FUNC bb_getline(char *line_ptr, size_t line_alloc_len, FILE *file)
	292	{
	293	ssize_t res_sz;
	294	char *line;
	295	int delim = (NUL_DELIMITED ? '\0' : '\n');
	296
	297	res_sz = getdelim(line_ptr, line_alloc_len, delim, file);
	298	line = *line_ptr;
	299
	300	if (res_sz > 0) {
	301	if (line[res_sz - 1] == delim)
	302	line[--res_sz] = '\0';
	303	} else {
	304	free(line); /* uclibc allocates a buffer even on EOF. WTF? */
	305	}
	306	return res_sz;
	307	}
	308	#endif
	309
[821]	310	static int grep_file(FILE *file)
	311	{
[2725]	312	smalluint found;
[821]	313	int linenum = 0;
	314	int nmatches = 0;
[2725]	315	#if !ENABLE_EXTRA_COMPAT
	316	char *line;
	317	#else
	318	char *line = NULL;
	319	ssize_t line_len;
	320	size_t line_alloc_len;
	321	# define rm_so start[0]
	322	# define rm_eo end[0]
	323	#endif
[821]	324	#if ENABLE_FEATURE_GREP_CONTEXT
	325	int print_n_lines_after = 0;
	326	int curpos = 0; /* track where we are in the circular 'before' buffer */
	327	int idx = 0; /* used for iteration through the circular buffer */
[1765]	328	#else
	329	enum { print_n_lines_after = 0 };
[2725]	330	#endif
[821]	331
[2725]	332	while (
	333	#if !ENABLE_EXTRA_COMPAT
	334	(line = xmalloc_fgetline(file)) != NULL
	335	#else
	336	(line_len = bb_getline(&line, &line_alloc_len, file)) >= 0
	337	#endif
	338	) {
[821]	339	llist_t *pattern_ptr = pattern_head;
[2725]	340	grep_list_data_t gl = gl; / for gcc */
[821]	341
	342	linenum++;
[2725]	343	found = 0;
[821]	344	while (pattern_ptr) {
	345	gl = (grep_list_data_t *)pattern_ptr->data;
	346	if (FGREP_FLAG) {
[3232]	347	char *match;
	348	char *str = line;
	349	opt_f_again:
	350	match = ((option_mask32 & OPT_i)
	351	? strcasestr(str, gl->pattern)
	352	: strstr(str, gl->pattern)
	353	);
	354	if (match) {
	355	if (option_mask32 & OPT_x) {
	356	if (match != str)
	357	goto opt_f_not_found;
	358	if (str[strlen(gl->pattern)] != '\0')
	359	goto opt_f_not_found;
	360	} else
	361	if (option_mask32 & OPT_w) {
	362	char c = (match != str) ? match[-1] : ' ';
	363	if (!isalnum(c) && c != '_') {
	364	c = match[strlen(gl->pattern)];
	365	if (!c \|\| (!isalnum(c) && c != '_'))
	366	goto opt_f_found;
	367	}
	368	str = match + 1;
	369	goto opt_f_again;
	370	}
	371	opt_f_found:
	372	found = 1;
	373	opt_f_not_found: ;
	374	}
[821]	375	} else {
[1765]	376	if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
[821]	377	gl->flg_mem_alocated_compiled \|= COMPILED;
[2725]	378	#if !ENABLE_EXTRA_COMPAT
	379	xregcomp(&gl->compiled_regex, gl->pattern, reflags);
	380	#else
	381	memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
	382	gl->compiled_regex.translate = case_fold; /* for -i */
	383	if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
	384	bb_error_msg_and_die("bad regex '%s'", gl->pattern);
	385	#endif
[821]	386	}
[2725]	387	#if !ENABLE_EXTRA_COMPAT
	388	gl->matched_range.rm_so = 0;
	389	gl->matched_range.rm_eo = 0;
	390	#endif
	391	if (
	392	#if !ENABLE_EXTRA_COMPAT
	393	regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0
	394	#else
	395	re_search(&gl->compiled_regex, line, line_len,
	396	/start:/ 0, /range:/ line_len,
	397	&gl->matched_range) >= 0
	398	#endif
	399	) {
[3232]	400	if (option_mask32 & OPT_x) {
	401	found = (gl->matched_range.rm_so == 0
	402	&& line[gl->matched_range.rm_eo] == '\0');
	403	} else
	404	if (!(option_mask32 & OPT_w)) {
[2725]	405	found = 1;
[3232]	406	} else {
[1765]	407	char c = ' ';
[2725]	408	if (gl->matched_range.rm_so)
	409	c = line[gl->matched_range.rm_so - 1];
[1765]	410	if (!isalnum(c) && c != '_') {
[2725]	411	c = line[gl->matched_range.rm_eo];
[1765]	412	if (!c \|\| (!isalnum(c) && c != '_'))
[2725]	413	found = 1;
[1765]	414	}
[3232]	415	//BUG: "echo foop foo \| grep -w foo" should match, but doesn't:
	416	//we bail out on first "mismatch" because it's not a word.
[1765]	417	}
	418	}
[821]	419	}
[2725]	420	/* If it's non-inverted search, we can stop
	421	* at first match */
	422	if (found && !invert_search)
	423	goto do_found;
[821]	424	pattern_ptr = pattern_ptr->link;
	425	} /* while (pattern_ptr) */
	426
[2725]	427	if (found ^ invert_search) {
	428	do_found:
[1765]	429	/* keep track of matches */
	430	nmatches++;
[821]	431
[1765]	432	/* quiet/print (non)matching file names only? */
	433	if (option_mask32 & (OPT_q\|OPT_l\|OPT_L)) {
	434	free(line); /* we don't need line anymore */
	435	if (BE_QUIET) {
	436	/* manpage says about -q:
	437	* "exit immediately with zero status
	438	* if any match is found,
	439	* even if errors were detected" */
[2725]	440	exit(EXIT_SUCCESS);
[1765]	441	}
[821]	442	/* if we're just printing filenames, we stop after the first match */
[1765]	443	if (PRINT_FILES_WITH_MATCHES) {
	444	puts(cur_file);
[2725]	445	/* fall through to "return 1" */
[1765]	446	}
	447	/* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
	448	return 1; /* one match */
	449	}
[821]	450
	451	#if ENABLE_FEATURE_GREP_CONTEXT
[1765]	452	/* Were we printing context and saw next (unwanted) match? */
	453	if ((option_mask32 & OPT_m) && nmatches > max_matches)
	454	break;
	455	#endif
[821]	456
[1765]	457	/* print the matched line */
	458	if (PRINT_MATCH_COUNTS == 0) {
	459	#if ENABLE_FEATURE_GREP_CONTEXT
	460	int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
[821]	461
[1765]	462	/* if we were told to print 'before' lines and there is at least
	463	* one line in the circular buffer, print them */
	464	if (lines_before && before_buf[prevpos] != NULL) {
	465	int first_buf_entry_line_num = linenum - lines_before;
[821]	466
[1765]	467	/* advance to the first entry in the circular buffer, and
	468	* figure out the line number is of the first line in the
	469	* buffer */
	470	idx = curpos;
	471	while (before_buf[idx] == NULL) {
	472	idx = (idx + 1) % lines_before;
	473	first_buf_entry_line_num++;
[821]	474	}
	475
[1765]	476	/* now print each line in the buffer, clearing them as we go */
	477	while (before_buf[idx] != NULL) {
[2725]	478	print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-');
[1765]	479	free(before_buf[idx]);
	480	before_buf[idx] = NULL;
	481	idx = (idx + 1) % lines_before;
	482	first_buf_entry_line_num++;
	483	}
	484	}
	485
	486	/* make a note that we need to print 'after' lines */
	487	print_n_lines_after = lines_after;
[821]	488	#endif
[1765]	489	if (option_mask32 & OPT_o) {
[2725]	490	if (FGREP_FLAG) {
	491	/* -Fo just prints the pattern
	492	* (unless -v: -Fov doesnt print anything at all) */
	493	if (found)
	494	print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
	495	} else while (1) {
	496	unsigned start = gl->matched_range.rm_so;
	497	unsigned end = gl->matched_range.rm_eo;
	498	unsigned len = end - start;
	499	char old = line[end];
	500	line[end] = '\0';
	501	/* Empty match is not printed: try "echo test \| grep -o ''" */
	502	if (len != 0)
	503	print_line(line + start, len, linenum, ':');
	504	if (old == '\0')
	505	break;
	506	line[end] = old;
	507	if (len == 0)
	508	end++;
	509	#if !ENABLE_EXTRA_COMPAT
	510	if (regexec(&gl->compiled_regex, line + end,
	511	1, &gl->matched_range, REG_NOTBOL) != 0)
	512	break;
	513	gl->matched_range.rm_so += end;
	514	gl->matched_range.rm_eo += end;
	515	#else
	516	if (re_search(&gl->compiled_regex, line, line_len,
	517	end, line_len - end,
	518	&gl->matched_range) < 0)
	519	break;
	520	#endif
	521	}
[1765]	522	} else {
[2725]	523	print_line(line, line_len, linenum, ':');
[821]	524	}
	525	}
[1765]	526	}
[821]	527	#if ENABLE_FEATURE_GREP_CONTEXT
[1765]	528	else { /* no match */
[821]	529	/* if we need to print some context lines after the last match, do so */
[1765]	530	if (print_n_lines_after) {
[2725]	531	print_line(line, strlen(line), linenum, '-');
[821]	532	print_n_lines_after--;
[1765]	533	} else if (lines_before) {
	534	/* Add the line to the circular 'before' buffer */
	535	free(before_buf[curpos]);
	536	before_buf[curpos] = line;
[2725]	537	IF_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
[1765]	538	curpos = (curpos + 1) % lines_before;
[2725]	539	/* avoid free(line) - we took the line */
[1765]	540	line = NULL;
[821]	541	}
[1765]	542	}
	543
[821]	544	#endif /* ENABLE_FEATURE_GREP_CONTEXT */
[2725]	545	#if !ENABLE_EXTRA_COMPAT
[821]	546	free(line);
[2725]	547	#endif
[1765]	548	/* Did we print all context after last requested match? */
	549	if ((option_mask32 & OPT_m)
[2725]	550	&& !print_n_lines_after
	551	&& nmatches == max_matches
	552	) {
[1765]	553	break;
[2725]	554	}
	555	} /* while (read line) */
[821]	556
	557	/* special-case file post-processing for options where we don't print line
	558	* matches, just filenames and possibly match counts */
	559
	560	/* grep -c: print [filename:]count, even if count is zero */
	561	if (PRINT_MATCH_COUNTS) {
[1765]	562	if (print_filename)
[821]	563	printf("%s:", cur_file);
[1765]	564	printf("%d\n", nmatches);
[821]	565	}
	566
[1765]	567	/* grep -L: print just the filename */
	568	if (PRINT_FILES_WITHOUT_MATCHES) {
	569	/* nmatches is zero, no need to check it:
	570	* we return 1 early if we detected a match
	571	* and PRINT_FILES_WITHOUT_MATCHES is set */
[821]	572	puts(cur_file);
	573	}
	574
	575	return nmatches;
	576	}
	577
	578	#if ENABLE_FEATURE_CLEAN_UP
	579	#define new_grep_list_data(p, m) add_grep_list_data(p, m)
[2725]	580	static char add_grep_list_data(char pattern, int flg_used_mem)
[821]	581	#else
	582	#define new_grep_list_data(p, m) add_grep_list_data(p)
[2725]	583	static char add_grep_list_data(char pattern)
[821]	584	#endif
	585	{
[2725]	586	grep_list_data_t gl = xzalloc(sizeof(gl));
[821]	587	gl->pattern = pattern;
	588	#if ENABLE_FEATURE_CLEAN_UP
	589	gl->flg_mem_alocated_compiled = flg_used_mem;
	590	#else
[2725]	591	/gl->flg_mem_alocated_compiled = 0;/
[821]	592	#endif
	593	return (char *)gl;
	594	}
	595
	596	static void load_regexes_from_file(llist_t *fopt)
	597	{
[1765]	598	while (fopt) {
[3232]	599	char *line;
	600	FILE *fp;
[821]	601	llist_t *cur = fopt;
	602	char *ffile = cur->data;
	603
	604	fopt = cur->link;
	605	free(cur);
[3232]	606	fp = xfopen_stdin(ffile);
	607	while ((line = xmalloc_fgetline(fp)) != NULL) {
[821]	608	llist_add_to(&pattern_head,
[2725]	609	new_grep_list_data(line, ALLOCATED));
[821]	610	}
[3232]	611	fclose_if_not_stdin(fp);
[821]	612	}
	613	}
	614
[2725]	615	static int FAST_FUNC file_action_grep(const char *filename,
	616	struct stat *statbuf UNUSED_PARAM,
	617	void* matched,
	618	int depth UNUSED_PARAM)
[1765]	619	{
[2725]	620	FILE *file = fopen_for_read(filename);
[1765]	621	if (file == NULL) {
	622	if (!SUPPRESS_ERR_MSGS)
[2725]	623	bb_simple_perror_msg(filename);
[1765]	624	open_errors = 1;
	625	return 0;
	626	}
	627	cur_file = filename;
	628	(int)matched += grep_file(file);
	629	fclose(file);
	630	return 1;
	631	}
[821]	632
[1765]	633	static int grep_dir(const char *dir)
	634	{
	635	int matched = 0;
	636	recursive_action(dir,
	637	/* recurse=yes */ ACTION_RECURSE \|
	638	/* followLinks=no */
	639	/* depthFirst=yes */ ACTION_DEPTHFIRST,
	640	/* fileAction= */ file_action_grep,
	641	/* dirAction= */ NULL,
	642	/* userData= */ &matched,
	643	/* depth= */ 0);
	644	return matched;
	645	}
	646
[2725]	647	int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
	648	int grep_main(int argc UNUSED_PARAM, char **argv)
[821]	649	{
	650	FILE *file;
	651	int matched;
	652	llist_t *fopt = NULL;
	653
	654	/* do normal option parsing */
	655	#if ENABLE_FEATURE_GREP_CONTEXT
[2725]	656	int Copt, opts;
[821]	657
[2725]	658	/* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
	659	* -m,-A,-B,-C have numeric param */
	660	opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
	661	opts = getopt32(argv,
[1765]	662	OPTSTR_GREP,
[2725]	663	&pattern_head, &fopt, &max_matches,
	664	&lines_after, &lines_before, &Copt);
[821]	665
[2725]	666	if (opts & OPT_C) {
[1765]	667	/* -C unsets prev -A and -B, but following -A or -B
[3232]	668	* may override it */
[2725]	669	if (!(opts & OPT_A)) /* not overridden */
	670	lines_after = Copt;
	671	if (!(opts & OPT_B)) /* not overridden */
	672	lines_before = Copt;
[821]	673	}
[1765]	674	/* sanity checks */
[2725]	675	if (opts & (OPT_c\|OPT_q\|OPT_l\|OPT_L)) {
[1765]	676	option_mask32 &= ~OPT_n;
[821]	677	lines_before = 0;
	678	lines_after = 0;
[2725]	679	} else if (lines_before > 0) {
	680	if (lines_before > INT_MAX / sizeof(long long))
	681	lines_before = INT_MAX / sizeof(long long);
	682	/* overflow in (lines_before * sizeof(x)) is prevented (above) */
	683	before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
	684	IF_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
	685	}
[821]	686	#else
	687	/* with auto sanity checks */
[2725]	688	/* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
	689	opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+";
[1765]	690	getopt32(argv, OPTSTR_GREP,
[2725]	691	&pattern_head, &fopt, &max_matches);
[821]	692	#endif
[1765]	693	invert_search = ((option_mask32 & OPT_v) != 0); /* 0 \| 1 */
[821]	694
[3232]	695	{ /* convert char *argv to grep_list_data_t /
[821]	696	llist_t *cur;
[1765]	697	for (cur = pattern_head; cur; cur = cur->link)
[821]	698	cur->data = new_grep_list_data(cur->data, 0);
	699	}
[3232]	700	if (option_mask32 & OPT_f) {
[821]	701	load_regexes_from_file(fopt);
[3232]	702	if (!pattern_head) { /* -f EMPTY_FILE? */
	703	/* GNU grep treats it as "nothing matches" */
	704	llist_add_to(&pattern_head, new_grep_list_data((char*) "", 0));
	705	invert_search ^= 1;
	706	}
	707	}
[821]	708
[1765]	709	if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
	710	option_mask32 \|= OPT_F;
[821]	711
[2725]	712	#if !ENABLE_EXTRA_COMPAT
[1765]	713	if (!(option_mask32 & (OPT_o \| OPT_w)))
[821]	714	reflags = REG_NOSUB;
[2725]	715	#endif
[821]	716
[2725]	717	if (ENABLE_FEATURE_GREP_EGREP_ALIAS
	718	&& (applet_name[0] == 'e' \|\| (option_mask32 & OPT_E))
	719	) {
[1765]	720	reflags \|= REG_EXTENDED;
[2725]	721	}
	722	#if ENABLE_EXTRA_COMPAT
	723	else {
	724	reflags = RE_SYNTAX_GREP;
	725	}
	726	#endif
[1765]	727
[2725]	728	if (option_mask32 & OPT_i) {
	729	#if !ENABLE_EXTRA_COMPAT
[821]	730	reflags \|= REG_ICASE;
[2725]	731	#else
	732	int i;
	733	case_fold = xmalloc(256);
	734	for (i = 0; i < 256; i++)
	735	case_fold[i] = (unsigned char)i;
	736	for (i = 'a'; i <= 'z'; i++)
	737	case_fold[i] = (unsigned char)(i - ('a' - 'A'));
	738	#endif
	739	}
[821]	740
	741	argv += optind;
	742
[2725]	743	/* if we didn't get a pattern from -e and no command file was specified,
	744	* first parameter should be the pattern. no pattern, no worky */
[821]	745	if (pattern_head == NULL) {
[1765]	746	char *pattern;
[821]	747	if (*argv == NULL)
	748	bb_show_usage();
[1765]	749	pattern = new_grep_list_data(*argv++, 0);
	750	llist_add_to(&pattern_head, pattern);
[821]	751	}
	752
[2725]	753	/* argv[0..(argc-1)] should be names of file to grep through. If
[1765]	754	* there is more than one file to grep, we will print the filenames. */
[2725]	755	if (argv[0] && argv[1])
[1765]	756	print_filename = 1;
	757	/* -H / -h of course override */
	758	if (option_mask32 & OPT_H)
	759	print_filename = 1;
	760	if (option_mask32 & OPT_h)
	761	print_filename = 0;
[821]	762
	763	/* If no files were specified, or '-' was specified, take input from
	764	* stdin. Otherwise, we grep through all the files specified. */
	765	matched = 0;
[2725]	766	do {
	767	cur_file = *argv;
[1765]	768	file = stdin;
[2725]	769	if (!cur_file \|\| LONE_DASH(cur_file)) {
[821]	770	cur_file = "(standard input)";
	771	} else {
[1765]	772	if (option_mask32 & OPT_r) {
	773	struct stat st;
	774	if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
	775	if (!(option_mask32 & OPT_h))
	776	print_filename = 1;
	777	matched += grep_dir(cur_file);
	778	goto grep_done;
	779	}
	780	}
	781	/* else: fopen(dir) will succeed, but reading won't */
[2725]	782	file = fopen_for_read(cur_file);
[1765]	783	if (file == NULL) {
	784	if (!SUPPRESS_ERR_MSGS)
[2725]	785	bb_simple_perror_msg(cur_file);
[1765]	786	open_errors = 1;
	787	continue;
[821]	788	}
	789	}
[1765]	790	matched += grep_file(file);
	791	fclose_if_not_stdin(file);
	792	grep_done: ;
[2725]	793	} while (argv && ++argv);
[821]	794
	795	/* destroy all the elments in the pattern list */
	796	if (ENABLE_FEATURE_CLEAN_UP) {
	797	while (pattern_head) {
	798	llist_t *pattern_head_ptr = pattern_head;
[2725]	799	grep_list_data_t gl = (grep_list_data_t )pattern_head_ptr->data;
[821]	800
	801	pattern_head = pattern_head->link;
[2725]	802	if (gl->flg_mem_alocated_compiled & ALLOCATED)
[821]	803	free(gl->pattern);
[2725]	804	if (gl->flg_mem_alocated_compiled & COMPILED)
	805	regfree(&gl->compiled_regex);
[1765]	806	free(gl);
[821]	807	free(pattern_head_ptr);
	808	}
	809	}
	810	/* 0 = success, 1 = failed, 2 = error */
[1765]	811	if (open_errors)
[821]	812	return 2;
[2725]	813	return !matched; /* invert return value: 0 = success, 1 = failed */
[821]	814	}

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source: MondoRescue/branches/3.2/mindi-busybox/findutils/grep.c

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