390 lines
10 KiB
C
390 lines
10 KiB
C
/*
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* Mini grep implementation for busybox using libc regex.
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*
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* Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
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* Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*
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* Apr 2004 by Vladimir Oleynik <dzo@simtreas.ru> -
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* correction "-e pattern1 -e pattern2" logic and more optimizations.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <regex.h>
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#include <string.h>
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#include <errno.h>
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#include "busybox.h"
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/* options */
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#define GREP_OPTS "lnqvscFiHhe:f:"
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#define GREP_OPT_l 1
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static char print_files_with_matches;
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#define GREP_OPT_n 2
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static char print_line_num;
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#define GREP_OPT_q 4
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static char be_quiet;
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#define GREP_OPT_v 8
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typedef char invert_search_t;
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static invert_search_t invert_search;
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#define GREP_OPT_s 16
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static char suppress_err_msgs;
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#define GREP_OPT_c 32
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static char print_match_counts;
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#define GREP_OPT_F 64
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static char fgrep_flag;
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#define GREP_OPT_i 128
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#define GREP_OPT_H 256
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#define GREP_OPT_h 512
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#define GREP_OPT_e 1024
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#define GREP_OPT_f 2048
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#ifdef CONFIG_FEATURE_GREP_CONTEXT
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#define GREP_OPT_CONTEXT "A:B:C"
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#define GREP_OPT_A 4096
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#define GREP_OPT_B 8192
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#define GREP_OPT_C 16384
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#define GREP_OPT_E 32768U
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#else
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#define GREP_OPT_CONTEXT ""
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#define GREP_OPT_E 4096
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#endif
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#ifdef CONFIG_FEATURE_GREP_EGREP_ALIAS
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# define OPT_EGREP "E"
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#else
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# define OPT_EGREP ""
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#endif
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static int reflags;
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static int print_filename;
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#ifdef CONFIG_FEATURE_GREP_CONTEXT
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static int lines_before;
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static int lines_after;
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static char **before_buf;
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static int last_line_printed;
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#endif /* CONFIG_FEATURE_GREP_CONTEXT */
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/* globals used internally */
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static llist_t *pattern_head; /* growable list of patterns to match */
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static char *cur_file; /* the current file we are reading */
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static void print_line(const char *line, int linenum, char decoration)
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{
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#ifdef CONFIG_FEATURE_GREP_CONTEXT
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/* possibly print the little '--' separator */
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if ((lines_before || lines_after) && last_line_printed &&
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last_line_printed < linenum - 1) {
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puts("--");
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}
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last_line_printed = linenum;
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#endif
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if (print_filename)
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printf("%s%c", cur_file, decoration);
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if (print_line_num)
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printf("%i%c", linenum, decoration);
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puts(line);
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}
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extern void xregcomp(regex_t *preg, const char *regex, int cflags);
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static int grep_file(FILE *file)
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{
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char *line;
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invert_search_t ret;
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int linenum = 0;
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int nmatches = 0;
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#ifdef CONFIG_FEATURE_GREP_CONTEXT
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int print_n_lines_after = 0;
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int curpos = 0; /* track where we are in the circular 'before' buffer */
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int idx = 0; /* used for iteration through the circular buffer */
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#endif /* CONFIG_FEATURE_GREP_CONTEXT */
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while ((line = bb_get_chomped_line_from_file(file)) != NULL) {
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llist_t *pattern_ptr = pattern_head;
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linenum++;
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ret = 0;
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while (pattern_ptr) {
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if (fgrep_flag) {
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ret = strstr(line, pattern_ptr->data) != NULL;
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} else {
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/*
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* test for a postitive-assertion match (regexec returns success (0)
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* and the user did not specify invert search), or a negative-assertion
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* match (regexec returns failure (REG_NOMATCH) and the user specified
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* invert search)
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*/
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regex_t regex;
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xregcomp(®ex, pattern_ptr->data, reflags);
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ret |= regexec(®ex, line, 0, NULL, 0) == 0;
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regfree(®ex);
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}
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pattern_ptr = pattern_ptr->link;
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} /* while (pattern_ptr) */
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if ((ret ^ invert_search)) {
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if (print_files_with_matches || be_quiet)
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free(line);
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/* if we found a match but were told to be quiet, stop here */
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if (be_quiet)
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return -1;
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/* keep track of matches */
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nmatches++;
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/* if we're just printing filenames, we stop after the first match */
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if (print_files_with_matches)
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break;
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/* print the matched line */
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if (print_match_counts == 0) {
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#ifdef CONFIG_FEATURE_GREP_CONTEXT
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int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
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/* if we were told to print 'before' lines and there is at least
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* one line in the circular buffer, print them */
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if (lines_before && before_buf[prevpos] != NULL) {
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int first_buf_entry_line_num = linenum - lines_before;
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/* advance to the first entry in the circular buffer, and
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* figure out the line number is of the first line in the
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* buffer */
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idx = curpos;
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while (before_buf[idx] == NULL) {
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idx = (idx + 1) % lines_before;
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first_buf_entry_line_num++;
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}
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/* now print each line in the buffer, clearing them as we go */
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while (before_buf[idx] != NULL) {
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print_line(before_buf[idx], first_buf_entry_line_num, '-');
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free(before_buf[idx]);
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before_buf[idx] = NULL;
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idx = (idx + 1) % lines_before;
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first_buf_entry_line_num++;
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}
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}
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/* make a note that we need to print 'after' lines */
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print_n_lines_after = lines_after;
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#endif /* CONFIG_FEATURE_GREP_CONTEXT */
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print_line(line, linenum, ':');
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}
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}
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#ifdef CONFIG_FEATURE_GREP_CONTEXT
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else { /* no match */
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/* Add the line to the circular 'before' buffer */
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if(lines_before) {
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free(before_buf[curpos]);
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before_buf[curpos] = bb_xstrdup(line);
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curpos = (curpos + 1) % lines_before;
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}
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}
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/* if we need to print some context lines after the last match, do so */
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if (print_n_lines_after && (last_line_printed != linenum)) {
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print_line(line, linenum, '-');
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print_n_lines_after--;
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}
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#endif /* CONFIG_FEATURE_GREP_CONTEXT */
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free(line);
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}
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/* special-case file post-processing for options where we don't print line
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* matches, just filenames and possibly match counts */
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/* grep -c: print [filename:]count, even if count is zero */
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if (print_match_counts) {
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if (print_filename)
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printf("%s:", cur_file);
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printf("%d\n", nmatches);
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}
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/* grep -l: print just the filename, but only if we grepped the line in the file */
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if (print_files_with_matches && nmatches > 0) {
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puts(cur_file);
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}
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return nmatches;
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}
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static void load_regexes_from_file(llist_t *fopt)
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{
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char *line;
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FILE *f;
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while(fopt) {
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llist_t *cur = fopt;
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char *ffile = cur->data;
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fopt = cur->link;
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free(cur);
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f = bb_xfopen(ffile, "r");
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while ((line = bb_get_chomped_line_from_file(f)) != NULL) {
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pattern_head = llist_add_to(pattern_head, line);
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}
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}
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}
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extern int grep_main(int argc, char **argv)
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{
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FILE *file;
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int matched;
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unsigned long opt;
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llist_t *fopt;
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/* do normal option parsing */
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#ifdef CONFIG_FEATURE_GREP_CONTEXT
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{
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char *junk;
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char *slines_after;
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char *slines_before;
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char *Copt;
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bb_opt_complementaly = "H-h:e*:f*:C-AB";
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opt = bb_getopt_ulflags(argc, argv,
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GREP_OPTS GREP_OPT_CONTEXT OPT_EGREP,
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&pattern_head, &fopt,
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&slines_after, &slines_before, &Copt);
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if(opt & GREP_OPT_C) {
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/* C option unseted A and B options, but next -A or -B
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may be ovewrite own option */
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if(!(opt & GREP_OPT_A)) /* not overwtited */
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slines_after = Copt;
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if(!(opt & GREP_OPT_B)) /* not overwtited */
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slines_before = Copt;
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opt |= GREP_OPT_A|GREP_OPT_B; /* set for parse now */
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}
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if(opt & GREP_OPT_A) {
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lines_after = strtoul(slines_after, &junk, 10);
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if(*junk != '\0')
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bb_error_msg_and_die("invalid context length argument");
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}
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if(opt & GREP_OPT_B) {
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lines_before = strtoul(slines_before, &junk, 10);
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if(*junk != '\0')
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bb_error_msg_and_die("invalid context length argument");
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}
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/* sanity checks after parse may be invalid numbers ;-) */
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if ((opt & (GREP_OPT_c|GREP_OPT_q|GREP_OPT_l))) {
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opt &= ~GREP_OPT_n;
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lines_before = 0;
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lines_after = 0;
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} else if(lines_before > 0)
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before_buf = (char **)xcalloc(lines_before, sizeof(char *));
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}
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#else
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/* with auto sanity checks */
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bb_opt_complementaly = "H-h:e*:f*:c-n:q-n:l-n";
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opt = bb_getopt_ulflags(argc, argv, GREP_OPTS OPT_EGREP,
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&pattern_head, &fopt);
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#endif
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print_files_with_matches = opt & GREP_OPT_l;
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print_line_num = opt & GREP_OPT_n;
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be_quiet = opt & GREP_OPT_q;
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invert_search = (opt & GREP_OPT_v) != 0; /* 0 | 1 */
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suppress_err_msgs = opt & GREP_OPT_s;
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print_match_counts = opt & GREP_OPT_c;
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fgrep_flag = opt & GREP_OPT_F;
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if(opt & GREP_OPT_H)
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print_filename++;
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if(opt & GREP_OPT_h)
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print_filename--;
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if(opt & GREP_OPT_f)
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load_regexes_from_file(fopt);
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#ifdef CONFIG_FEATURE_GREP_EGREP_ALIAS
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if(bb_applet_name[0] == 'e' || (opt & GREP_OPT_E))
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reflags = REG_EXTENDED | REG_NOSUB;
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else
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#endif
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reflags = REG_NOSUB;
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if(opt & GREP_OPT_i)
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reflags |= REG_ICASE;
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argv += optind;
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argc -= optind;
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/* if we didn't get a pattern from a -e and no command file was specified,
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* argv[optind] should be the pattern. no pattern, no worky */
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if (pattern_head == NULL) {
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if (*argv == NULL)
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bb_show_usage();
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else {
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pattern_head = llist_add_to(pattern_head, *argv++);
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argc--;
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}
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}
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/* argv[(optind)..(argc-1)] should be names of file to grep through. If
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* there is more than one file to grep, we will print the filenames */
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if (argc > 1) {
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print_filename++;
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/* If no files were specified, or '-' was specified, take input from
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* stdin. Otherwise, we grep through all the files specified. */
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} else if (argc == 0) {
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argc++;
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}
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matched = 0;
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while (argc--) {
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cur_file = *argv++;
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if(!cur_file || (*cur_file == '-' && !cur_file[1])) {
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cur_file = "-";
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file = stdin;
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} else {
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file = fopen(cur_file, "r");
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}
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if (file == NULL) {
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if (!suppress_err_msgs)
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bb_perror_msg("%s", cur_file);
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} else {
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matched += grep_file(file);
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if(matched < 0) {
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/* we found a match but were told to be quiet, stop here and
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* return success */
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break;
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}
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fclose(file);
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}
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}
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#ifdef CONFIG_FEATURE_CLEAN_UP
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/* destroy all the elments in the pattern list */
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while (pattern_head) {
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llist_t *pattern_head_ptr = pattern_head;
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pattern_head = pattern_head->link;
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free(pattern_head_ptr);
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}
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#endif
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return !matched; /* invert return value 0 = success, 1 = failed */
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}
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