X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=grep.c;h=03cc9f836dbed6cb80cd55d5979e9271f7708976;hb=044228d5ecb9b79397f9fc915d046cf4538281e2;hp=e29606405c1a50c768637b59097ad072117803ec;hpb=d84990eb1ffe7eac68eb9006969bf530f297b078;p=oweals%2Fbusybox.git diff --git a/grep.c b/grep.c index e29606405..03cc9f836 100644 --- a/grep.c +++ b/grep.c @@ -1,10 +1,8 @@ -/* vi: set sw=4 ts=4: */ /* - * Mini grep implementation for busybox + * Mini grep implementation for busybox using libc regex. * - * - * Copyright (C) 1999,2000 by Lineo, inc. - * Written by Erik Andersen , + * 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 @@ -22,149 +20,337 @@ * */ -/* - 18-Dec-1999 Konstantin Boldyshev - - + -q option (be quiet) - + exit code depending on grep result (TRUE or FALSE) - (useful for scripts) -*/ - -#include "internal.h" -#include "regexp.h" #include -#include +#include +#include +#include +#include /* for strerror() */ #include -#include -#include -#include -#include -#define BB_DECLARE_EXTERN -#define bb_need_too_few_args -#include "messages.c" - -static const char grep_usage[] = - "grep [OPTIONS]... PATTERN [FILE]...\n" -#ifndef BB_FEATURE_TRIVIAL_HELP - "\nSearch for PATTERN in each FILE or standard input.\n\n" - "OPTIONS:\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\n" -#if defined BB_REGEXP - "This version of grep matches full regular expresions.\n"; -#else - "This version of grep matches strings (not regular expresions).\n" -#endif +#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) +{ +#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); +} -static int match = FALSE, beQuiet = FALSE; -static void do_grep(FILE * fp, char *needle, char *fileName, int tellName, - int ignoreCase, int tellLine, int invertSearch) +static void grep_file(FILE *file) { - long line = 0; - char *haystack; - int truth = !invertSearch; + 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 ((haystack = cstring_lineFromFile(fp))) { - line++; - if (find_match(haystack, needle, ignoreCase) == truth) { - if (tellName == TRUE) - printf("%s:", fileName); + while ((line = get_line_from_file(file)) != NULL) { + chomp(line); + linenum++; - if (tellLine == TRUE) - printf("%ld:", line); + 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 (beQuiet == FALSE) - fputs(haystack, stdout); + /* if we found a match but were told to be quiet, stop here and + * return success */ + if (be_quiet) + exit(0); - match = TRUE; - } - free(haystack); + /* 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); + } + + + /* 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, 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; } -extern int grep_main(int argc, char **argv) +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() { - FILE *fp; - char *needle; - char *fileName; - int tellName = TRUE; - int ignoreCase = FALSE; - int tellLine = FALSE; - int invertSearch = FALSE; - - if (argc < 1) { - usage(grep_usage); + if (regexes == NULL) + return; + + /* destroy all the elments in the array */ + while (--nregexes >= 0) { + regfree(®exes[nregexes]); + free(®exes[nregexes]); } - argv++; +} +#endif + + +extern int grep_main(int argc, char **argv) +{ + int opt; +#ifdef BB_FEATURE_GREP_CONTEXT + char *junk; +#endif - while (--argc >= 0 && *argv && (**argv == '-')) { - while (*++(*argv)) { - switch (**argv) { +#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, "iHhlnqvsce:f:" +#ifdef BB_FEATURE_GREP_CONTEXT +"A:B:C:" +#endif +)) > 0) { + switch (opt) { case 'i': - ignoreCase = TRUE; + reflags |= REG_ICASE; + break; + case 'l': + print_files_with_matches++; + break; + case 'H': + print_filename++; break; - case 'h': - tellName = FALSE; + print_filename--; break; - case 'n': - tellLine = TRUE; + print_line_num++; break; - case 'q': - beQuiet = TRUE; + be_quiet++; break; - case 'v': - invertSearch = TRUE; + 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: - usage(grep_usage); - } + show_usage(); } - argv++; } - if (argc == 0 || *argv == NULL) { - fatalError(too_few_args, "grep"); + /* 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++; + } } - needle = *argv++; - argc--; - - if (argc == 0) { - do_grep(stdin, needle, "stdin", FALSE, ignoreCase, tellLine, invertSearch); - } else { - /* Never print the filename for just one file */ - if (argc == 1) - tellName = FALSE; - while (argc-- > 0) { - fileName = *argv++; - - fp = fopen(fileName, "r"); - if (fp == NULL) { - perror(fileName); - continue; - } + /* 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 + } - do_grep(fp, needle, fileName, tellName, ignoreCase, tellLine, invertSearch); + /* 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 (ferror(fp)) - perror(fileName); - fclose(fp); + /* 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); + } } } - exit(match); -} - -/* END CODE */ + return !matched; /* invert return value 0 = success, 1 = failed */ +}