X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=grep.c;h=3254868be1672e03e045c4b8f1e7b47fac9af580;hb=b0a0fc89446c5f3851a9ec42f64cf16297cda0fd;hp=dec365f05be675baf00d34a01e36db85dc91dba0;hpb=df5f6ba1159f8c1af500fa1b8eb9c9646e4de2a6;p=oweals%2Fbusybox.git diff --git a/grep.c b/grep.c index dec365f05..3254868be 100644 --- a/grep.c +++ b/grep.c @@ -1,8 +1,8 @@ /* * Mini grep implementation for busybox using libc regex. * - * Copyright (C) 1999,2000 by Lineo, inc. - * Written by Mark Whitley , + * 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 @@ -26,94 +26,236 @@ #include #include /* for strerror() */ #include -#include "internal.h" +#include "busybox.h" + extern int optind; /* in unistd.h */ extern int errno; /* for use with strerror() */ - -static const char grep_usage[] = - "grep [-ihHnqvs] pattern [files...]\n" -#ifndef BB_FEATURE_TRIVIAL_HELP - "\nSearch for PATTERN in each FILE or standard input.\n\n" - "Options:\n" - "\t-H\tprefix output lines with filename where match was found\n" - "\t-h\tsuppress the prefixing filename on output\n" - "\t-i\tignore case distinctions\n" - "\t-n\tprint line number with output lines\n" - "\t-q\tbe quiet. Returns 0 if result was found, 1 otherwise\n" - "\t-v\tselect non-matching lines\n" - "\t-s\tsuppress file open/read error messages\n\n" -#endif - ; +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 be_quiet = 0; -static int invert_search = 0; -static int suppress_err_msgs = 0; - -/* globals */ -static regex_t regex; /* storage space for compiled regular expression */ -static int nmatches = 0; /* keeps track of the number of matches */ +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_matched_line(char *line, int linenum) +static void print_line(const char *line, int linenum, char decoration) { +#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:", cur_file); + printf("%s%c", cur_file, decoration); if (print_line_num) - printf("%i:", linenum); - - printf("%s", line); + printf("%i%c", linenum, decoration); + puts(line); } + 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++; - ret = regexec(®ex, line, 0, NULL, 0); - if (ret == 0 && !invert_search) { /* match */ - - /* if we found a match but were told to be quiet, stop here and - * return success */ - if (be_quiet) { - regfree(®ex); - exit(0); + + 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; + } + } + + /* 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); + } - nmatches++; - print_matched_line(line, linenum); + /* 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); + if (print_files_with_matches && nmatches > 0) + printf("1\n"); + else + printf("%d\n", nmatches); + } + + /* 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); + } + + + /* remember if we matched */ + if (nmatches != 0) + matched = 1; +} - } else if (ret == REG_NOMATCH && invert_search) { - print_matched_line(line, linenum); - } +static void add_regex(const char *restr) +{ + regexes = xrealloc(regexes, sizeof(regex_t) * (++nregexes)); + xregcomp(®exes[nregexes-1], restr, reflags); +} + + +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); } } + +#ifdef BB_FEATURE_CLEAN_UP +static void destroy_regexes() +{ + if (regexes == NULL) + return; + + /* destroy all the elments in the array */ + while (--nregexes >= 0) { + regfree(®exes[nregexes]); + free(®exes[nregexes]); + } +} +#endif + + extern int grep_main(int argc, char **argv) { int opt; - int reflags; +#ifdef BB_FEATURE_GREP_CONTEXT + char *junk; +#endif - /* do special-case option parsing */ - if (argv[1] && (strcmp(argv[1], "--help") == 0)) - usage(grep_usage); +#ifdef BB_FEATURE_CLEAN_UP + /* destroy command strings on exit */ + if (atexit(destroy_regexes) == -1) + perror_msg_and_die("atexit"); +#endif /* do normal option parsing */ - while ((opt = getopt(argc, argv, "iHhnqvs")) > 0) { + while ((opt = getopt(argc, argv, "iHhlnqvsce:f:" +#ifdef BB_FEATURE_GREP_CONTEXT +"A:B:C:" +#endif +)) > 0) { switch (opt) { case 'i': - ignore_case++; + reflags |= REG_ICASE; + break; + case 'l': + print_files_with_matches++; break; case 'H': print_filename++; @@ -133,51 +275,85 @@ extern int grep_main(int argc, char **argv) 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(); } } - /* argv[optind] should be the regex pattern; no pattern, no worky */ - if (argv[optind] == NULL) - usage(grep_usage); + /* 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++; + } + } - /* compile the regular expression - * we're not going to mess with sub-expressions, and we need to - * treat newlines right. */ - reflags = REG_NOSUB | REG_NEWLINE; - if (ignore_case) - reflags |= REG_ICASE; - if (bb_regcomp(®ex, argv[optind], reflags) != 0) - exit(1); + /* 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 + } - /* argv[(optind+1)..(argc-1)] should be names of file to grep through. If + /* 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+1) > 0) + 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+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) { + if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) { grep_file(stdin); - } else { + } + else { int i; FILE *file; - for (i = optind + 1; i < argc; i++) { + for (i = optind; i < argc; i++) { cur_file = argv[i]; file = fopen(cur_file, "r"); if (file == NULL) { if (!suppress_err_msgs) - fprintf(stderr, "grep: %s: %s\n", cur_file, strerror(errno)); - } else { + perror_msg("%s", cur_file); + } + else { grep_file(file); fclose(file); } } } - regfree(®ex); - - if (nmatches == 0) - return 1; - - return 0; + return !matched; /* invert return value 0 = success, 1 = failed */ }