busybox/findutils/grep.c

/* 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 "match whole line only". */
/* 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(EXIT_SUCCESS) 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;
#if !ENABLE_EXTRA_COMPAT
	int reflags;
#else
	RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */
#endif
	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;
	USE_EXTRA_COMPAT(size_t *before_buf_size;)
	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         )
#if !ENABLE_EXTRA_COMPAT
#define reflags           (G.reflags             )
#else
#define case_fold         (G.case_fold           )
/* http://www.delorie.com/gnu/docs/regex/regex_46.html */
#define reflags           re_syntax_options
#undef REG_NOSUB
#undef REG_EXTENDED
#undef REG_ICASE
#define REG_NOSUB    bug:is:here /* should not be used */
#define REG_EXTENDED RE_SYNTAX_EGREP
#define REG_ICASE    bug:is:here /* should not be used */
#endif
#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 before_buf_size   (G.before_buf_size     )
#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;
/* for GNU regex, matched_range must be persistent across grep_file() calls */
#if !ENABLE_EXTRA_COMPAT
	regex_t compiled_regex;
	regmatch_t matched_range;
#else
	struct re_pattern_buffer compiled_regex;
	struct re_registers matched_range;
#endif
#define ALLOCATED 1
#define COMPILED 2
	int flg_mem_alocated_compiled;
} grep_list_data_t;

#if !ENABLE_EXTRA_COMPAT
#define print_line(line, line_len, linenum, decoration) \
	print_line(line, linenum, decoration)
#endif
static void print_line(const char *line, size_t line_len, 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)) {
#if !ENABLE_EXTRA_COMPAT
		puts(line);
#else
		fwrite(line, 1, line_len, stdout);
		putchar('\n');
#endif
	}
}

#if ENABLE_EXTRA_COMPAT
/* Unlike getline, this one removes trailing '\n' */
static ssize_t FAST_FUNC bb_getline(char **line_ptr, size_t *line_alloc_len, FILE *file)
{
	ssize_t res_sz;
	char *line;

	res_sz = getline(line_ptr, line_alloc_len, file);
	line = *line_ptr;

	if (res_sz > 0) {
		if (line[res_sz - 1] == '\n')
			line[--res_sz] = '\0';
	} else {
		free(line); /* uclibc allocates a buffer even on EOF. WTF? */
	}
	return res_sz;
}
#endif

static int grep_file(FILE *file)
{
	smalluint found;
	int linenum = 0;
	int nmatches = 0;
#if !ENABLE_EXTRA_COMPAT
	char *line;
#else
	char *line = NULL;
	ssize_t line_len;
	size_t line_alloc_len;
#define rm_so start[0]
#define rm_eo end[0]
#endif
#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 (
#if !ENABLE_EXTRA_COMPAT
		(line = xmalloc_fgetline(file)) != NULL
#else
		(line_len = bb_getline(&line, &line_alloc_len, file)) >= 0
#endif
	) {
		llist_t *pattern_ptr = pattern_head;
		grep_list_data_t *gl = gl; /* for gcc */

		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;
#if !ENABLE_EXTRA_COMPAT
					xregcomp(&gl->compiled_regex, gl->pattern, reflags);
#else
					memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
					gl->compiled_regex.translate = case_fold; /* for -i */
					if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
						bb_error_msg_and_die("bad regex '%s'", gl->pattern);
#endif
				}
#if !ENABLE_EXTRA_COMPAT
				gl->matched_range.rm_so = 0;
				gl->matched_range.rm_eo = 0;
#endif
				if (
#if !ENABLE_EXTRA_COMPAT
					regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0
#else
					re_search(&gl->compiled_regex, line, line_len,
							/*start:*/ 0, /*range:*/ line_len,
							&gl->matched_range) >= 0
#endif
				) {
					if (!(option_mask32 & OPT_w))
						found = 1;
					else {
						char c = ' ';
						if (gl->matched_range.rm_so)
							c = line[gl->matched_range.rm_so - 1];
						if (!isalnum(c) && c != '_') {
							c = line[gl->matched_range.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(EXIT_SUCCESS);
				}
				/* if we're just printing filenames, we stop after the first match */
				if (PRINT_FILES_WITH_MATCHES) {
					puts(cur_file);
					/* fall through 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], before_buf_size[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) {
					if (FGREP_FLAG) {
						/* -Fo just prints the pattern
						 * (unless -v: -Fov doesnt print anything at all) */
						if (found)
							print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
					} else while (1) {
						char old = line[gl->matched_range.rm_eo];
						line[gl->matched_range.rm_eo] = '\0';
						print_line(line + gl->matched_range.rm_so,
								gl->matched_range.rm_eo - gl->matched_range.rm_so,
								linenum, ':');
						line[gl->matched_range.rm_eo] = old;
#if !ENABLE_EXTRA_COMPAT
						break;
#else
						if (re_search(&gl->compiled_regex, line, line_len,
								gl->matched_range.rm_eo, line_len - gl->matched_range.rm_eo, 
								&gl->matched_range) < 0)
							break;
#endif
					} 
				} else {
					print_line(line, line_len, 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, strlen(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;
				USE_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
				curpos = (curpos + 1) % lines_before;
				/* avoid free(line) - we took the line */
				line = NULL;
			}
		}

#endif /* ENABLE_FEATURE_GREP_CONTEXT */
#if !ENABLE_EXTRA_COMPAT
		free(line);
#endif
		/* Did we print all context after last requested match? */
		if ((option_mask32 & OPT_m)
		 && !print_n_lines_after && nmatches == max_matches)
			break;
	} /* while (read 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 */
	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_stdin(ffile);
		while ((line = xmalloc_fgetline(f)) != NULL) {
			llist_add_to(&pattern_head,
				new_grep_list_data(line, ALLOCATED));
		}
	}
}

static int FAST_FUNC file_action_grep(const char *filename,
			struct stat *statbuf UNUSED_PARAM,
			void* matched,
			int depth UNUSED_PARAM)
{
	FILE *file = fopen_for_read(filename);
	if (file == NULL) {
		if (!SUPPRESS_ERR_MSGS)
			bb_simple_perror_msg(filename);
		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) MAIN_EXTERNALLY_VISIBLE;
int grep_main(int argc, char **argv)
{
	FILE *file;
	int matched;
	llist_t *fopt = NULL;

	/* do normal option parsing */
#if ENABLE_FEATURE_GREP_CONTEXT
	int Copt;

	/* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
	 * -m,-A,-B,-C have numeric param */
	opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
	getopt32(argv,
		OPTSTR_GREP,
		&pattern_head, &fopt, &max_matches,
		&lines_after, &lines_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 */
			lines_after = Copt;
		if (!(option_mask32 & OPT_B)) /* not overridden */
			lines_before = Copt;
	}
	/* 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(before_buf[0]));
		USE_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
	}
#else
	/* with auto sanity checks */
	/* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
	opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+";
	getopt32(argv, OPTSTR_GREP,
		&pattern_head, &fopt, &max_matches);
#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 !ENABLE_EXTRA_COMPAT
	if (!(option_mask32 & (OPT_o | OPT_w)))
		reflags = REG_NOSUB;
#endif

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

	if (option_mask32 & OPT_i) {
#if !ENABLE_EXTRA_COMPAT
		reflags |= REG_ICASE;
#else
		int i;
		case_fold = xmalloc(256);
		for (i = 0; i < 256; i++)
			case_fold[i] = (unsigned char)i;
		for (i = 'a'; i <= 'z'; i++)
			case_fold[i] = (unsigned char)(i - ('a' - 'A'));
#endif
	}

	argv += optind;
	argc -= optind;

	/* if we didn't get a pattern from -e and no command file was specified,
	 * first parameter 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[0..(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 || LONE_DASH(cur_file)) {
			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_for_read(cur_file);
			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 & ALLOCATED)
				free(gl->pattern);
			if (gl->flg_mem_alocated_compiled & COMPILED)
				regfree(&gl->compiled_regex);
			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 */
}
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	/*
19	* (C) 2006 Jac Goudsmit added -o option
20	*/
21
22	#include "libbb.h"
23	#include "xregex.h"
24
25	/* options */
26	#define OPTSTR_GREP \
27	"lnqvscFiHhe:f:Lorm:" \
28	USE_FEATURE_GREP_CONTEXT("A:B:C:") \
29	USE_FEATURE_GREP_EGREP_ALIAS("E") \
30	USE_DESKTOP("w") \
31	"aI"
32	/* ignored: -a "assume all files to be text" */
33	/* ignored: -I "assume binary files have no matches" */
34
35	enum {
36	OPTBIT_l, /* list matched file names only */
37	OPTBIT_n, /* print line# */
38	OPTBIT_q, /* quiet - exit(EXIT_SUCCESS) of first match */
39	OPTBIT_v, /* invert the match, to select non-matching lines */
40	OPTBIT_s, /* suppress errors about file open errors */
41	OPTBIT_c, /* count matches per file (suppresses normal output) */
42	OPTBIT_F, /* literal match */
43	OPTBIT_i, /* case-insensitive */
44	OPTBIT_H, /* force filename display */
45	OPTBIT_h, /* inhibit filename display */
46	OPTBIT_e, /* -e PATTERN */
47	OPTBIT_f, /* -f FILE_WITH_PATTERNS */
48	OPTBIT_L, /* list unmatched file names only */
49	OPTBIT_o, /* show only matching parts of lines */
50	OPTBIT_r, /* recurse dirs */
51	OPTBIT_m, /* -m MAX_MATCHES */
52	USE_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */
53	USE_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */
54	USE_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */
55	USE_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */
56	USE_DESKTOP( OPTBIT_w ,) /* whole word match */
57	OPT_l = 1 << OPTBIT_l,
58	OPT_n = 1 << OPTBIT_n,
59	OPT_q = 1 << OPTBIT_q,
60	OPT_v = 1 << OPTBIT_v,
61	OPT_s = 1 << OPTBIT_s,
62	OPT_c = 1 << OPTBIT_c,
63	OPT_F = 1 << OPTBIT_F,
64	OPT_i = 1 << OPTBIT_i,
65	OPT_H = 1 << OPTBIT_H,
66	OPT_h = 1 << OPTBIT_h,
67	OPT_e = 1 << OPTBIT_e,
68	OPT_f = 1 << OPTBIT_f,
69	OPT_L = 1 << OPTBIT_L,
70	OPT_o = 1 << OPTBIT_o,
71	OPT_r = 1 << OPTBIT_r,
72	OPT_m = 1 << OPTBIT_m,
73	OPT_A = USE_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0,
74	OPT_B = USE_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0,
75	OPT_C = USE_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0,
76	OPT_E = USE_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0,
77	OPT_w = USE_DESKTOP( (1 << OPTBIT_w)) + 0,
78	};
79
80	#define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l)
81	#define PRINT_LINE_NUM (option_mask32 & OPT_n)
82	#define BE_QUIET (option_mask32 & OPT_q)
83	#define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s)
84	#define PRINT_MATCH_COUNTS (option_mask32 & OPT_c)
85	#define FGREP_FLAG (option_mask32 & OPT_F)
86	#define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
87
88	struct globals {
89	int max_matches;
90	#if !ENABLE_EXTRA_COMPAT
91	int reflags;
92	#else
93	RE_TRANSLATE_TYPE case_fold; /* RE_TRANSLATE_TYPE is [[un]signed] char* */
94	#endif
95	smalluint invert_search;
96	smalluint print_filename;
97	smalluint open_errors;
98	#if ENABLE_FEATURE_GREP_CONTEXT
99	smalluint did_print_line;
100	int lines_before;
101	int lines_after;
102	char **before_buf;
103	USE_EXTRA_COMPAT(size_t *before_buf_size;)
104	int last_line_printed;
105	#endif
106	/* globals used internally */
107	llist_t pattern_head; / growable list of patterns to match */
108	const char cur_file; / the current file we are reading */
109	};
110	#define G ((struct globals)&bb_common_bufsiz1)
111	#define INIT_G() do { \
112	struct G_sizecheck { \
113	char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
114	}; \
115	} while (0)
116	#define max_matches (G.max_matches )
117	#if !ENABLE_EXTRA_COMPAT
118	#define reflags (G.reflags )
119	#else
120	#define case_fold (G.case_fold )
121	/* http://www.delorie.com/gnu/docs/regex/regex_46.html */
122	#define reflags re_syntax_options
123	#undef REG_NOSUB
124	#undef REG_EXTENDED
125	#undef REG_ICASE
126	#define REG_NOSUB bug:is:here /* should not be used */
127	#define REG_EXTENDED RE_SYNTAX_EGREP
128	#define REG_ICASE bug:is:here /* should not be used */
129	#endif
130	#define invert_search (G.invert_search )
131	#define print_filename (G.print_filename )
132	#define open_errors (G.open_errors )
133	#define did_print_line (G.did_print_line )
134	#define lines_before (G.lines_before )
135	#define lines_after (G.lines_after )
136	#define before_buf (G.before_buf )
137	#define before_buf_size (G.before_buf_size )
138	#define last_line_printed (G.last_line_printed )
139	#define pattern_head (G.pattern_head )
140	#define cur_file (G.cur_file )
141
142
143	typedef struct grep_list_data_t {
144	char *pattern;
145	/* for GNU regex, matched_range must be persistent across grep_file() calls */
146	#if !ENABLE_EXTRA_COMPAT
147	regex_t compiled_regex;
148	regmatch_t matched_range;
149	#else
150	struct re_pattern_buffer compiled_regex;
151	struct re_registers matched_range;
152	#endif
153	#define ALLOCATED 1
154	#define COMPILED 2
155	int flg_mem_alocated_compiled;
156	} grep_list_data_t;
157
158	#if !ENABLE_EXTRA_COMPAT
159	#define print_line(line, line_len, linenum, decoration) \
160	print_line(line, linenum, decoration)
161	#endif
162	static void print_line(const char *line, size_t line_len, int linenum, char decoration)
163	{
164	#if ENABLE_FEATURE_GREP_CONTEXT
165	/* Happens when we go to next file, immediately hit match
166	* and try to print prev context... from prev file! Don't do it */
167	if (linenum < 1)
168	return;
169	/* possibly print the little '--' separator */
170	if ((lines_before \|\| lines_after) && did_print_line
171	&& last_line_printed != linenum - 1
172	) {
173	puts("--");
174	}
175	/* guard against printing "--" before first line of first file */
176	did_print_line = 1;
177	last_line_printed = linenum;
178	#endif
179	if (print_filename)
180	printf("%s%c", cur_file, decoration);
181	if (PRINT_LINE_NUM)
182	printf("%i%c", linenum, decoration);
183	/* Emulate weird GNU grep behavior with -ov */
184	if ((option_mask32 & (OPT_v\|OPT_o)) != (OPT_v\|OPT_o)) {
185	#if !ENABLE_EXTRA_COMPAT
186	puts(line);
187	#else
188	fwrite(line, 1, line_len, stdout);
189	putchar('\n');
190	#endif
191	}
192	}
193
194	#if ENABLE_EXTRA_COMPAT
195	/* Unlike getline, this one removes trailing '\n' */
196	static ssize_t FAST_FUNC bb_getline(char *line_ptr, size_t line_alloc_len, FILE *file)
197	{
198	ssize_t res_sz;
199	char *line;
200
201	res_sz = getline(line_ptr, line_alloc_len, file);
202	line = *line_ptr;
203
204	if (res_sz > 0) {
205	if (line[res_sz - 1] == '\n')
206	line[--res_sz] = '\0';
207	} else {
208	free(line); /* uclibc allocates a buffer even on EOF. WTF? */
209	}
210	return res_sz;
211	}
212	#endif
213
214	static int grep_file(FILE *file)
215	{
216	smalluint found;
217	int linenum = 0;
218	int nmatches = 0;
219	#if !ENABLE_EXTRA_COMPAT
220	char *line;
221	#else
222	char *line = NULL;
223	ssize_t line_len;
224	size_t line_alloc_len;
225	#define rm_so start[0]
226	#define rm_eo end[0]
227	#endif
228	#if ENABLE_FEATURE_GREP_CONTEXT
229	int print_n_lines_after = 0;
230	int curpos = 0; /* track where we are in the circular 'before' buffer */
231	int idx = 0; /* used for iteration through the circular buffer */
232	#else
233	enum { print_n_lines_after = 0 };
234	#endif /* ENABLE_FEATURE_GREP_CONTEXT */
235
236	while (
237	#if !ENABLE_EXTRA_COMPAT
238	(line = xmalloc_fgetline(file)) != NULL
239	#else
240	(line_len = bb_getline(&line, &line_alloc_len, file)) >= 0
241	#endif
242	) {
243	llist_t *pattern_ptr = pattern_head;
244	grep_list_data_t gl = gl; / for gcc */
245
246	linenum++;
247	found = 0;
248	while (pattern_ptr) {
249	gl = (grep_list_data_t *)pattern_ptr->data;
250	if (FGREP_FLAG) {
251	found \|= (strstr(line, gl->pattern) != NULL);
252	} else {
253	if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
254	gl->flg_mem_alocated_compiled \|= COMPILED;
255	#if !ENABLE_EXTRA_COMPAT
256	xregcomp(&gl->compiled_regex, gl->pattern, reflags);
257	#else
258	memset(&gl->compiled_regex, 0, sizeof(gl->compiled_regex));
259	gl->compiled_regex.translate = case_fold; /* for -i */
260	if (re_compile_pattern(gl->pattern, strlen(gl->pattern), &gl->compiled_regex))
261	bb_error_msg_and_die("bad regex '%s'", gl->pattern);
262	#endif
263	}
264	#if !ENABLE_EXTRA_COMPAT
265	gl->matched_range.rm_so = 0;
266	gl->matched_range.rm_eo = 0;
267	#endif
268	if (
269	#if !ENABLE_EXTRA_COMPAT
270	regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0
271	#else
272	re_search(&gl->compiled_regex, line, line_len,
273	/start:/ 0, /range:/ line_len,
274	&gl->matched_range) >= 0
275	#endif
276	) {
277	if (!(option_mask32 & OPT_w))
278	found = 1;
279	else {
280	char c = ' ';
281	if (gl->matched_range.rm_so)
282	c = line[gl->matched_range.rm_so - 1];
283	if (!isalnum(c) && c != '_') {
284	c = line[gl->matched_range.rm_eo];
285	if (!c \|\| (!isalnum(c) && c != '_'))
286	found = 1;
287	}
288	}
289	}
290	}
291	/* If it's non-inverted search, we can stop
292	* at first match */
293	if (found && !invert_search)
294	goto do_found;
295	pattern_ptr = pattern_ptr->link;
296	} /* while (pattern_ptr) */
297
298	if (found ^ invert_search) {
299	do_found:
300	/* keep track of matches */
301	nmatches++;
302
303	/* quiet/print (non)matching file names only? */
304	if (option_mask32 & (OPT_q\|OPT_l\|OPT_L)) {
305	free(line); /* we don't need line anymore */
306	if (BE_QUIET) {
307	/* manpage says about -q:
308	* "exit immediately with zero status
309	* if any match is found,
310	* even if errors were detected" */
311	exit(EXIT_SUCCESS);
312	}
313	/* if we're just printing filenames, we stop after the first match */
314	if (PRINT_FILES_WITH_MATCHES) {
315	puts(cur_file);
316	/* fall through to "return 1" */
317	}
318	/* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
319	return 1; /* one match */
320	}
321
322	#if ENABLE_FEATURE_GREP_CONTEXT
323	/* Were we printing context and saw next (unwanted) match? */
324	if ((option_mask32 & OPT_m) && nmatches > max_matches)
325	break;
326	#endif
327
328	/* print the matched line */
329	if (PRINT_MATCH_COUNTS == 0) {
330	#if ENABLE_FEATURE_GREP_CONTEXT
331	int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
332
333	/* if we were told to print 'before' lines and there is at least
334	* one line in the circular buffer, print them */
335	if (lines_before && before_buf[prevpos] != NULL) {
336	int first_buf_entry_line_num = linenum - lines_before;
337
338	/* advance to the first entry in the circular buffer, and
339	* figure out the line number is of the first line in the
340	* buffer */
341	idx = curpos;
342	while (before_buf[idx] == NULL) {
343	idx = (idx + 1) % lines_before;
344	first_buf_entry_line_num++;
345	}
346
347	/* now print each line in the buffer, clearing them as we go */
348	while (before_buf[idx] != NULL) {
349	print_line(before_buf[idx], before_buf_size[idx], first_buf_entry_line_num, '-');
350	free(before_buf[idx]);
351	before_buf[idx] = NULL;
352	idx = (idx + 1) % lines_before;
353	first_buf_entry_line_num++;
354	}
355	}
356
357	/* make a note that we need to print 'after' lines */
358	print_n_lines_after = lines_after;
359	#endif
360	if (option_mask32 & OPT_o) {
361	if (FGREP_FLAG) {
362	/* -Fo just prints the pattern
363	* (unless -v: -Fov doesnt print anything at all) */
364	if (found)
365	print_line(gl->pattern, strlen(gl->pattern), linenum, ':');
366	} else while (1) {
367	char old = line[gl->matched_range.rm_eo];
368	line[gl->matched_range.rm_eo] = '\0';
369	print_line(line + gl->matched_range.rm_so,
370	gl->matched_range.rm_eo - gl->matched_range.rm_so,
371	linenum, ':');
372	line[gl->matched_range.rm_eo] = old;
373	#if !ENABLE_EXTRA_COMPAT
374	break;
375	#else
376	if (re_search(&gl->compiled_regex, line, line_len,
377	gl->matched_range.rm_eo, line_len - gl->matched_range.rm_eo,
378	&gl->matched_range) < 0)
379	break;
380	#endif
381	}
382	} else {
383	print_line(line, line_len, linenum, ':');
384	}
385	}
386	}
387	#if ENABLE_FEATURE_GREP_CONTEXT
388	else { /* no match */
389	/* if we need to print some context lines after the last match, do so */
390	if (print_n_lines_after) {
391	print_line(line, strlen(line), linenum, '-');
392	print_n_lines_after--;
393	} else if (lines_before) {
394	/* Add the line to the circular 'before' buffer */
395	free(before_buf[curpos]);
396	before_buf[curpos] = line;
397	USE_EXTRA_COMPAT(before_buf_size[curpos] = line_len;)
398	curpos = (curpos + 1) % lines_before;
399	/* avoid free(line) - we took the line */
400	line = NULL;
401	}
402	}
403
404	#endif /* ENABLE_FEATURE_GREP_CONTEXT */
405	#if !ENABLE_EXTRA_COMPAT
406	free(line);
407	#endif
408	/* Did we print all context after last requested match? */
409	if ((option_mask32 & OPT_m)
410	&& !print_n_lines_after && nmatches == max_matches)
411	break;
412	} /* while (read line) */
413
414	/* special-case file post-processing for options where we don't print line
415	* matches, just filenames and possibly match counts */
416
417	/* grep -c: print [filename:]count, even if count is zero */
418	if (PRINT_MATCH_COUNTS) {
419	if (print_filename)
420	printf("%s:", cur_file);
421	printf("%d\n", nmatches);
422	}
423
424	/* grep -L: print just the filename */
425	if (PRINT_FILES_WITHOUT_MATCHES) {
426	/* nmatches is zero, no need to check it:
427	* we return 1 early if we detected a match
428	* and PRINT_FILES_WITHOUT_MATCHES is set */
429	puts(cur_file);
430	}
431
432	return nmatches;
433	}
434
435	#if ENABLE_FEATURE_CLEAN_UP
436	#define new_grep_list_data(p, m) add_grep_list_data(p, m)
437	static char add_grep_list_data(char pattern, int flg_used_mem)
438	#else
439	#define new_grep_list_data(p, m) add_grep_list_data(p)
440	static char add_grep_list_data(char pattern)
441	#endif
442	{
443	grep_list_data_t gl = xzalloc(sizeof(gl));
444	gl->pattern = pattern;
445	#if ENABLE_FEATURE_CLEAN_UP
446	gl->flg_mem_alocated_compiled = flg_used_mem;
447	#else
448	/gl->flg_mem_alocated_compiled = 0;/
449	#endif
450	return (char *)gl;
451	}
452
453	static void load_regexes_from_file(llist_t *fopt)
454	{
455	char *line;
456	FILE *f;
457
458	while (fopt) {
459	llist_t *cur = fopt;
460	char *ffile = cur->data;
461
462	fopt = cur->link;
463	free(cur);
464	f = xfopen_stdin(ffile);
465	while ((line = xmalloc_fgetline(f)) != NULL) {
466	llist_add_to(&pattern_head,
467	new_grep_list_data(line, ALLOCATED));
468	}
469	}
470	}
471
472	static int FAST_FUNC file_action_grep(const char *filename,
473	struct stat *statbuf UNUSED_PARAM,
474	void* matched,
475	int depth UNUSED_PARAM)
476	{
477	FILE *file = fopen_for_read(filename);
478	if (file == NULL) {
479	if (!SUPPRESS_ERR_MSGS)
480	bb_simple_perror_msg(filename);
481	open_errors = 1;
482	return 0;
483	}
484	cur_file = filename;
485	(int)matched += grep_file(file);
486	fclose(file);
487	return 1;
488	}
489
490	static int grep_dir(const char *dir)
491	{
492	int matched = 0;
493	recursive_action(dir,
494	/* recurse=yes */ ACTION_RECURSE \|
495	/* followLinks=no */
496	/* depthFirst=yes */ ACTION_DEPTHFIRST,
497	/* fileAction= */ file_action_grep,
498	/* dirAction= */ NULL,
499	/* userData= */ &matched,
500	/* depth= */ 0);
501	return matched;
502	}
503
504	int grep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
505	int grep_main(int argc, char **argv)
506	{
507	FILE *file;
508	int matched;
509	llist_t *fopt = NULL;
510
511	/* do normal option parsing */
512	#if ENABLE_FEATURE_GREP_CONTEXT
513	int Copt;
514
515	/* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
516	* -m,-A,-B,-C have numeric param */
517	opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
518	getopt32(argv,
519	OPTSTR_GREP,
520	&pattern_head, &fopt, &max_matches,
521	&lines_after, &lines_before, &Copt);
522
523	if (option_mask32 & OPT_C) {
524	/* -C unsets prev -A and -B, but following -A or -B
525	may override it */
526	if (!(option_mask32 & OPT_A)) /* not overridden */
527	lines_after = Copt;
528	if (!(option_mask32 & OPT_B)) /* not overridden */
529	lines_before = Copt;
530	}
531	/* sanity checks */
532	if (option_mask32 & (OPT_c\|OPT_q\|OPT_l\|OPT_L)) {
533	option_mask32 &= ~OPT_n;
534	lines_before = 0;
535	lines_after = 0;
536	} else if (lines_before > 0) {
537	before_buf = xzalloc(lines_before * sizeof(before_buf[0]));
538	USE_EXTRA_COMPAT(before_buf_size = xzalloc(lines_before * sizeof(before_buf_size[0]));)
539	}
540	#else
541	/* with auto sanity checks */
542	/* -H unsets -h; -c,-q or -l unset -n; -e,-f are lists; -m N */
543	opt_complementary = "H-h:c-n:q-n:l-n:e::f::m+";
544	getopt32(argv, OPTSTR_GREP,
545	&pattern_head, &fopt, &max_matches);
546	#endif
547	invert_search = ((option_mask32 & OPT_v) != 0); /* 0 \| 1 */
548
549	if (pattern_head != NULL) {
550	/* convert char *argv to grep_list_data_t /
551	llist_t *cur;
552
553	for (cur = pattern_head; cur; cur = cur->link)
554	cur->data = new_grep_list_data(cur->data, 0);
555	}
556	if (option_mask32 & OPT_f)
557	load_regexes_from_file(fopt);
558
559	if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
560	option_mask32 \|= OPT_F;
561
562	#if !ENABLE_EXTRA_COMPAT
563	if (!(option_mask32 & (OPT_o \| OPT_w)))
564	reflags = REG_NOSUB;
565	#endif
566
567	if (ENABLE_FEATURE_GREP_EGREP_ALIAS
568	&& (applet_name[0] == 'e' \|\| (option_mask32 & OPT_E))
569	) {
570	reflags \|= REG_EXTENDED;
571	}
572	#if ENABLE_EXTRA_COMPAT
573	else {
574	reflags = RE_SYNTAX_GREP;
575	}
576	#endif
577
578	if (option_mask32 & OPT_i) {
579	#if !ENABLE_EXTRA_COMPAT
580	reflags \|= REG_ICASE;
581	#else
582	int i;
583	case_fold = xmalloc(256);
584	for (i = 0; i < 256; i++)
585	case_fold[i] = (unsigned char)i;
586	for (i = 'a'; i <= 'z'; i++)
587	case_fold[i] = (unsigned char)(i - ('a' - 'A'));
588	#endif
589	}
590
591	argv += optind;
592	argc -= optind;
593
594	/* if we didn't get a pattern from -e and no command file was specified,
595	* first parameter should be the pattern. no pattern, no worky */
596	if (pattern_head == NULL) {
597	char *pattern;
598	if (*argv == NULL)
599	bb_show_usage();
600	pattern = new_grep_list_data(*argv++, 0);
601	llist_add_to(&pattern_head, pattern);
602	argc--;
603	}
604
605	/* argv[0..(argc-1)] should be names of file to grep through. If
606	* there is more than one file to grep, we will print the filenames. */
607	if (argc > 1)
608	print_filename = 1;
609	/* -H / -h of course override */
610	if (option_mask32 & OPT_H)
611	print_filename = 1;
612	if (option_mask32 & OPT_h)
613	print_filename = 0;
614
615	/* If no files were specified, or '-' was specified, take input from
616	* stdin. Otherwise, we grep through all the files specified. */
617	matched = 0;
618	do {
619	cur_file = *argv++;
620	file = stdin;
621	if (!cur_file \|\| LONE_DASH(cur_file)) {
622	cur_file = "(standard input)";
623	} else {
624	if (option_mask32 & OPT_r) {
625	struct stat st;
626	if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
627	if (!(option_mask32 & OPT_h))
628	print_filename = 1;
629	matched += grep_dir(cur_file);
630	goto grep_done;
631	}
632	}
633	/* else: fopen(dir) will succeed, but reading won't */
634	file = fopen_for_read(cur_file);
635	if (file == NULL) {
636	if (!SUPPRESS_ERR_MSGS)
637	bb_simple_perror_msg(cur_file);
638	open_errors = 1;
639	continue;
640	}
641	}
642	matched += grep_file(file);
643	fclose_if_not_stdin(file);
644	grep_done: ;
645	} while (--argc > 0);
646
647	/* destroy all the elments in the pattern list */
648	if (ENABLE_FEATURE_CLEAN_UP) {
649	while (pattern_head) {
650	llist_t *pattern_head_ptr = pattern_head;
651	grep_list_data_t gl = (grep_list_data_t )pattern_head_ptr->data;
652
653	pattern_head = pattern_head->link;
654	if (gl->flg_mem_alocated_compiled & ALLOCATED)
655	free(gl->pattern);
656	if (gl->flg_mem_alocated_compiled & COMPILED)
657	regfree(&gl->compiled_regex);
658	free(gl);
659	free(pattern_head_ptr);
660	}
661	}
662	/* 0 = success, 1 = failed, 2 = error */
663	if (open_errors)
664	return 2;
665	return !matched; /* invert return value: 0 = success, 1 = failed */
666	}