| /* |
| * Mini grep implementation for busybox using libc regex. |
| * |
| * Copyright (C) 1999,2000,2001 by Lineo, inc. |
| * Written by Mark Whitley <markw@lineo.com>, <markw@codepoet.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <getopt.h> |
| #include <regex.h> |
| #include <string.h> /* for strerror() */ |
| #include <errno.h> |
| #include "busybox.h" |
| |
| |
| extern int optind; /* in unistd.h */ |
| extern int errno; /* for use with strerror() */ |
| extern void xregcomp(regex_t *preg, const char *regex, int cflags); /* in busybox.h */ |
| |
| /* options */ |
| static int ignore_case = 0; |
| static int print_filename = 0; |
| static int print_line_num = 0; |
| static int print_count_only = 0; |
| static int be_quiet = 0; |
| static int invert_search = 0; |
| static int suppress_err_msgs = 0; |
| |
| #ifdef BB_FEATURE_GREP_CONTEXT |
| extern char *optarg; /* in getopt.h */ |
| static int lines_before = 0; |
| static int lines_after = 0; |
| static char **before_buf = NULL; |
| static int last_line_printed = 0; |
| #endif /* BB_FEATURE_GREP_CONTEXT */ |
| |
| /* globals used internally */ |
| static regex_t regex; /* storage space for compiled regular expression */ |
| static int matched; /* keeps track of whether we ever matched */ |
| static char *cur_file = NULL; /* the current file we are reading */ |
| |
| static void print_line(const char *line, int linenum, char decoration) |
| { |
| #ifdef BB_FEATURE_GREP_CONTEXT |
| /* possibly print the little '--' seperator */ |
| if (last_line_printed && last_line_printed < linenum - 1) { |
| puts("--"); |
| } |
| last_line_printed = linenum; |
| #endif |
| if (print_filename) |
| printf("%s%c", cur_file, decoration); |
| if (print_line_num) |
| printf("%i%c", linenum, decoration); |
| puts(line); |
| } |
| |
| static void grep_file(FILE *file) |
| { |
| char *line = NULL; |
| int ret; |
| int linenum = 0; |
| int nmatches = 0; |
| #ifdef BB_FEATURE_GREP_CONTEXT |
| int print_n_lines_after = 0; |
| int curpos = 0; /* track where we are in the circular 'before' buffer */ |
| int idx = 0; /* used for iteration through the circular buffer */ |
| #endif /* BB_FEATURE_GREP_CONTEXT */ |
| |
| while ((line = get_line_from_file(file)) != NULL) { |
| chomp(line); |
| linenum++; |
| |
| /* |
| * test for a postitive-assertion match (regexec returns success (0) |
| * and the user did not specify invert search), or a negative-assertion |
| * match (regexec returns failure (REG_NOMATCH) and the user specified |
| * invert search) |
| */ |
| ret = regexec(®ex, line, 0, NULL, 0); |
| if ((ret == 0 && !invert_search) || (ret == REG_NOMATCH && invert_search)) { |
| |
| /* if we found a match but were told to be quiet, stop here and |
| * return success */ |
| if (be_quiet) { |
| regfree(®ex); |
| exit(0); |
| } |
| |
| /* otherwise, keep track of matches and print the matched line */ |
| nmatches++; |
| if (!print_count_only) { |
| #ifdef BB_FEATURE_GREP_CONTEXT |
| int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1; |
| |
| /* if we were told to print 'before' lines and there is at least |
| * one line in the circular buffer, print them */ |
| if (lines_before && before_buf[prevpos] != NULL) |
| { |
| int first_buf_entry_line_num = linenum - lines_before; |
| |
| /* advance to the first entry in the circular buffer, and |
| * figure out the line number is of the first line in the |
| * buffer */ |
| idx = curpos; |
| while (before_buf[idx] == NULL) { |
| idx = (idx + 1) % lines_before; |
| first_buf_entry_line_num++; |
| } |
| |
| /* now print each line in the buffer, clearing them as we go */ |
| while (before_buf[idx] != NULL) { |
| print_line(before_buf[idx], first_buf_entry_line_num, '-'); |
| free(before_buf[idx]); |
| before_buf[idx] = NULL; |
| idx = (idx + 1) % lines_before; |
| first_buf_entry_line_num++; |
| } |
| |
| } |
| |
| /* make a note that we need to print 'after' lines */ |
| print_n_lines_after = lines_after; |
| #endif /* BB_FEATURE_GREP_CONTEXT */ |
| print_line(line, linenum, ':'); |
| } |
| } |
| #ifdef BB_FEATURE_GREP_CONTEXT |
| else { /* no match */ |
| /* Add the line to the circular 'before' buffer */ |
| if(lines_before) |
| { |
| if(before_buf[curpos]) |
| free(before_buf[curpos]); |
| before_buf[curpos] = strdup(line); |
| curpos = (curpos + 1) % lines_before; |
| } |
| } |
| |
| /* if we need to print some context lines after the last match, do so */ |
| if (print_n_lines_after && (last_line_printed != linenum)) { |
| print_line(line, linenum, '-'); |
| print_n_lines_after--; |
| } |
| #endif /* BB_FEATURE_GREP_CONTEXT */ |
| free(line); |
| } |
| |
| /* special-case post processing */ |
| if (print_count_only) { |
| if (print_filename) |
| printf("%s:", cur_file); |
| printf("%i\n", nmatches); |
| } |
| |
| /* remember if we matched */ |
| if (nmatches != 0) |
| matched = 1; |
| } |
| |
| extern int grep_main(int argc, char **argv) |
| { |
| int opt; |
| int reflags; |
| #ifdef BB_FEATURE_GREP_CONTEXT |
| char *junk; |
| #endif |
| |
| /* do normal option parsing */ |
| while ((opt = getopt(argc, argv, "iHhnqvsc" |
| #ifdef BB_FEATURE_GREP_CONTEXT |
| "A:B:C:" |
| #endif |
| )) > 0) { |
| switch (opt) { |
| case 'i': |
| ignore_case++; |
| break; |
| case 'H': |
| print_filename++; |
| break; |
| case 'h': |
| print_filename--; |
| break; |
| case 'n': |
| print_line_num++; |
| break; |
| case 'q': |
| be_quiet++; |
| break; |
| case 'v': |
| invert_search++; |
| break; |
| case 's': |
| suppress_err_msgs++; |
| break; |
| case 'c': |
| print_count_only++; |
| break; |
| #ifdef BB_FEATURE_GREP_CONTEXT |
| case 'A': |
| lines_after = strtoul(optarg, &junk, 10); |
| if(*junk != '\0') |
| error_msg_and_die("invalid context length argument"); |
| break; |
| case 'B': |
| lines_before = strtoul(optarg, &junk, 10); |
| if(*junk != '\0') |
| error_msg_and_die("invalid context length argument"); |
| before_buf = (char **)calloc(lines_before, sizeof(char *)); |
| break; |
| case 'C': |
| lines_after = lines_before = strtoul(optarg, &junk, 10); |
| if(*junk != '\0') |
| error_msg_and_die("invalid context length argument"); |
| before_buf = (char **)calloc(lines_before, sizeof(char *)); |
| break; |
| #endif /* BB_FEATURE_GREP_CONTEXT */ |
| default: |
| show_usage(); |
| } |
| } |
| |
| /* argv[optind] should be the regex pattern; no pattern, no worky */ |
| if (argv[optind] == NULL) |
| show_usage(); |
| |
| /* sanity check */ |
| if (print_count_only || be_quiet) { |
| print_line_num = 0; |
| #ifdef BB_FEATURE_GREP_CONTEXT |
| lines_before = 0; |
| lines_after = 0; |
| #endif |
| } |
| |
| /* compile the regular expression |
| * we're not going to mess with sub-expressions, and we need to |
| * treat newlines right. */ |
| reflags = REG_NOSUB; |
| if (ignore_case) |
| reflags |= REG_ICASE; |
| xregcomp(®ex, argv[optind], reflags); |
| |
| /* argv[(optind+1)..(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) - (optind+1) > 0) |
| print_filename++; |
| |
| /* If no files were specified, or '-' was specified, take input from |
| * stdin. Otherwise, we grep through all the files specified. */ |
| if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) { |
| grep_file(stdin); |
| } |
| else { |
| int i; |
| FILE *file; |
| for (i = optind + 1; i < argc; i++) { |
| cur_file = argv[i]; |
| file = fopen(cur_file, "r"); |
| if (file == NULL) { |
| if (!suppress_err_msgs) |
| perror_msg("%s", cur_file); |
| } |
| else { |
| grep_file(file); |
| fclose(file); |
| } |
| } |
| } |
| |
| regfree(®ex); |
| |
| return !matched; /* invert return value 0 = success, 1 = failed */ |
| } |