X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=grep.c;h=03cc9f836dbed6cb80cd55d5979e9271f7708976;hb=044228d5ecb9b79397f9fc915d046cf4538281e2;hp=3779e5510a9eda7ea7ae988f140bfc40b003e63c;hpb=cc8ed39b240180b58810784f844e253263594ac3;p=oweals%2Fbusybox.git diff --git a/grep.c b/grep.c index 3779e5510..03cc9f836 100644 --- a/grep.c +++ b/grep.c @@ -1,210 +1,356 @@ /* - * Copyright (c) 1999 by David I. Bell - * Permission is granted to use, distribute, or modify this source, - * provided that this copyright notice remains intact. + * Mini grep implementation for busybox using libc regex. * - * The "grep" command, taken from sash. - * This provides basic file searching. + * Copyright (C) 1999,2000,2001 by Lineo, inc. + * Written by Mark Whitley , + * + * 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 * - * Permission to distribute this code under the GPL has been granted. - * Modified for busybox by Erik Andersen */ -#include "internal.h" -#ifdef BB_GREP - #include -#include +#include +#include +#include +#include /* for strerror() */ #include -#include -#include -#include -#include - - -const char grep_usage[] = -"Search the input file(s) for lines matching the given pattern.\n" -"\tI search stdin if no files are given.\n" -"\tI can't grok full regular expressions.\n" -"usage: grep [in] PATTERN [FILES]...\n" -"\ti=ignore case, n=list line numbers\n"; - - - -static BOOL search - (const char * string, const char * word, BOOL ignoreCase); - - -extern int -grep_main(struct FileInfo * unused, int argc, char ** argv) +#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 reflags = REG_NOSUB; +static int print_filename = 0; +static int print_line_num = 0; +static int print_match_counts = 0; +static int be_quiet = 0; +static int invert_search = 0; +static int suppress_err_msgs = 0; +static int print_files_with_matches = 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 *regexes = NULL; /* growable array of compiled regular expressions */ +static int nregexes = 0; /* number of elements in above arrary */ +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) { - FILE * fp; - const char * word; - const char * name; - const char * cp; - BOOL tellName; - BOOL ignoreCase; - BOOL tellLine; - long line; - char buf[BUF_SIZE]; - - ignoreCase = FALSE; - tellLine = FALSE; - - argc--; - argv++; - if (argc < 1) - { - fprintf(stderr, "%s", grep_usage); - return 1; +#ifdef BB_FEATURE_GREP_CONTEXT + /* possibly print the little '--' seperator */ + if ((lines_before || lines_after) && 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); +} - if (**argv == '-') - { - argc--; - cp = *argv++; - - while (*++cp) switch (*cp) - { - case 'i': - ignoreCase = TRUE; - break; - case 'n': - tellLine = TRUE; - break; +static void grep_file(FILE *file) +{ + char *line = NULL; + int ret; + int linenum = 0; + int nmatches = 0; + int i; +#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++; + + for (i = 0; i < nregexes; i++) { + /* + * 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(®exes[i], 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) + exit(0); + + /* keep track of matches */ + nmatches++; + + /* if we're just printing filenames, we stop after the first match */ + if (print_files_with_matches) + break; + + /* print the matched line */ + if (print_match_counts == 0) { +#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; + } + } - default: - fprintf(stderr, "Unknown option\n"); - return 1; - } + /* 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 */ + } /* for */ + free(line); } - word = *argv++; - argc--; - - tellName = (argc > 1); - - while (argc-- > 0) - { - name = *argv++; - - fp = fopen(name, "r"); - - if (fp == NULL) - { - perror(name); - - continue; - } - line = 0; + /* special-case file post-processing for options where we don't print line + * matches, just filenames and possibly match counts */ - while (fgets(buf, sizeof(buf), fp)) - { - line++; + /* 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); + } - cp = &buf[strlen(buf) - 1]; + /* grep -l: print just the filename, but only if we grepped the line in the file */ + if (print_files_with_matches && nmatches > 0) { + puts(cur_file); + } - if (*cp != '\n') - fprintf(stderr, "%s: Line too long\n", name); - if (search(buf, word, ignoreCase)) - { - if (tellName) - printf("%s: ", name); + /* remember if we matched */ + if (nmatches != 0) + matched = 1; +} - if (tellLine) - printf("%ld: ", line); - fputs(buf, stdout); - } - } +static void add_regex(const char *restr) +{ + regexes = xrealloc(regexes, sizeof(regex_t) * (++nregexes)); + xregcomp(®exes[nregexes-1], restr, reflags); +} - if (ferror(fp)) - perror(name); - fclose(fp); +static void load_regexes_from_file(const char *filename) +{ + char *line; + FILE *f = xfopen(filename, "r"); + while ((line = get_line_from_file(f)) != NULL) { + chomp(line); + add_regex(line); + free(line); } - return 0; } -/* - * See if the specified word is found in the specified string. - */ -static BOOL -search(const char * string, const char * word, BOOL ignoreCase) +#ifdef BB_FEATURE_CLEAN_UP +static void destroy_regexes() { - const char * cp1; - const char * cp2; - int len; - int lowFirst; - int ch1; - int ch2; + if (regexes == NULL) + return; - len = strlen(word); + /* destroy all the elments in the array */ + while (--nregexes >= 0) { + regfree(®exes[nregexes]); + free(®exes[nregexes]); + } +} +#endif - if (!ignoreCase) - { - while (TRUE) - { - string = strchr(string, word[0]); - if (string == NULL) - return FALSE; +extern int grep_main(int argc, char **argv) +{ + int opt; +#ifdef BB_FEATURE_GREP_CONTEXT + char *junk; +#endif - if (memcmp(string, word, len) == 0) - return TRUE; +#ifdef BB_FEATURE_CLEAN_UP + /* destroy command strings on exit */ + if (atexit(destroy_regexes) == -1) + perror_msg_and_die("atexit"); +#endif - string++; + /* do normal option parsing */ + while ((opt = getopt(argc, argv, "iHhlnqvsce:f:" +#ifdef BB_FEATURE_GREP_CONTEXT +"A:B:C:" +#endif +)) > 0) { + switch (opt) { + case 'i': + reflags |= REG_ICASE; + break; + case 'l': + print_files_with_matches++; + 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_match_counts++; + break; + case 'e': + add_regex(optarg); + break; + case 'f': + load_regexes_from_file(optarg); + 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(); } } - /* - * Here if we need to check case independence. - * Do the search by lower casing both strings. - */ - lowFirst = *word; - - if (isupper(lowFirst)) - lowFirst = tolower(lowFirst); - - while (TRUE) - { - while (*string && (*string != lowFirst) && - (!isupper(*string) || (tolower(*string) != lowFirst))) - { - string++; + /* if we didn't get a pattern from a -e and no command file was specified, + * argv[optind] should be the pattern. no pattern, no worky */ + if (nregexes == 0) { + if (argv[optind] == NULL) + show_usage(); + else { + add_regex(argv[optind]); + optind++; } + } - if (*string == '\0') - return FALSE; - - cp1 = string; - cp2 = word; - - do - { - if (*cp2 == '\0') - return TRUE; - - ch1 = *cp1++; - - if (isupper(ch1)) - ch1 = tolower(ch1); - - ch2 = *cp2++; + /* sanity checks */ + if (print_match_counts || be_quiet || print_files_with_matches) { + print_line_num = 0; +#ifdef BB_FEATURE_GREP_CONTEXT + lines_before = 0; + lines_after = 0; +#endif + } - if (isupper(ch2)) - ch2 = tolower(ch2); + /* argv[(optind)..(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) > 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] == NULL || (strcmp(argv[optind], "-") == 0)) { + grep_file(stdin); + } + else { + int i; + FILE *file; + for (i = optind; 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); + } } - while (ch1 == ch2); - - string++; } -} -#endif -/* END CODE */ + return !matched; /* invert return value 0 = success, 1 = failed */ +}