488 lines
11 KiB
C
488 lines
11 KiB
C
/* $OpenBSD: grep.c,v 1.38 2007/02/13 21:48:20 kili Exp $ */
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/*-
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* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/queue.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <getopt.h>
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#include <regex.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "grep.h"
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/* Flags passed to regcomp() and regexec() */
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int cflags;
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int eflags = REG_STARTEND;
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int matchall; /* shortcut */
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int patterns, pattern_sz;
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char **pattern;
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regex_t *r_pattern;
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fastgrep_t *fg_pattern;
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/* For regex errors */
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char re_error[RE_ERROR_BUF + 1];
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/* Command-line flags */
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int Aflag; /* -A x: print x lines trailing each match */
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int Bflag; /* -B x: print x lines leading each match */
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int Eflag; /* -E: interpret pattern as extended regexp */
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int Fflag; /* -F: interpret pattern as list of fixed strings */
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int Gflag; /* -G: interpret pattern as basic regexp */
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int Hflag; /* -H: if -R, follow explicitly listed symlinks */
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int Lflag; /* -L: only show names of files with no matches */
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int Pflag; /* -P: if -R, no symlinks are followed */
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int Rflag; /* -R: recursively search directory trees */
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int Sflag; /* -S: if -R, follow all symlinks */
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#ifndef NOZ
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int Zflag; /* -Z: decompress input before processing */
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#endif
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int bflag; /* -b: show block numbers for each match */
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int cflag; /* -c: only show a count of matching lines */
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int hflag; /* -h: don't print filename headers */
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int iflag; /* -i: ignore case */
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int lflag; /* -l: only show names of files with matches */
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int nflag; /* -n: show line numbers in front of matching lines */
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int oflag; /* -o: always print file name */
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int qflag; /* -q: quiet mode (don't output anything) */
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int sflag; /* -s: silent mode (ignore errors) */
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int vflag; /* -v: only show non-matching lines */
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int wflag; /* -w: pattern must start and end on word boundaries */
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int xflag; /* -x: pattern must match entire line */
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int lbflag; /* --line-buffered */
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int binbehave = BIN_FILE_BIN;
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enum {
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BIN_OPT = CHAR_MAX + 1,
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HELP_OPT,
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MMAP_OPT,
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LINEBUF_OPT
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};
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/* Housekeeping */
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int first; /* flag whether or not this is our first match */
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int tail; /* lines left to print */
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struct patfile {
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const char *pf_file;
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SLIST_ENTRY(patfile) pf_next;
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};
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SLIST_HEAD(, patfile) patfilelh;
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static void
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usage(void)
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{
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fprintf(stderr,
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#ifdef NOZ
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"usage: %s [-abcEFGHhIiLlnoPqRSsUVvwx] [-A num] [-B num] [-C[num]]\n"
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#else
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"usage: %s [-abcEFGHhIiLlnoPqRSsUVvwxZ] [-A num] [-B num] [-C[num]]\n"
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#endif
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"\t[-e pattern] [-f file] [--binary-files=value] [--context[=num]]\n"
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"\t[--line-buffered] [pattern] [file ...]\n", getprogname());
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exit(2);
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}
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#ifdef NOZ
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static char *optstr = "0123456789A:B:CEFGHILPSRUVabce:f:hilnoqrsuvwxy";
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#else
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static char *optstr = "0123456789A:B:CEFGHILPSRUVZabce:f:hilnoqrsuvwxy";
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#endif
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struct option long_options[] =
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{
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{"binary-files", required_argument, NULL, BIN_OPT},
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{"help", no_argument, NULL, HELP_OPT},
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{"mmap", no_argument, NULL, MMAP_OPT},
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{"line-buffered", no_argument, NULL, LINEBUF_OPT},
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{"after-context", required_argument, NULL, 'A'},
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{"before-context", required_argument, NULL, 'B'},
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{"context", optional_argument, NULL, 'C'},
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{"devices", required_argument, NULL, 'D'},
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{"extended-regexp", no_argument, NULL, 'E'},
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{"fixed-strings", no_argument, NULL, 'F'},
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{"basic-regexp", no_argument, NULL, 'G'},
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{"binary", no_argument, NULL, 'U'},
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{"version", no_argument, NULL, 'V'},
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{"text", no_argument, NULL, 'a'},
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{"byte-offset", no_argument, NULL, 'b'},
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{"count", no_argument, NULL, 'c'},
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{"regexp", required_argument, NULL, 'e'},
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{"file", required_argument, NULL, 'f'},
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{"no-filename", no_argument, NULL, 'h'},
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{"ignore-case", no_argument, NULL, 'i'},
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{"files-without-match", no_argument, NULL, 'L'},
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{"files-with-matches", no_argument, NULL, 'l'},
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{"line-number", no_argument, NULL, 'n'},
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{"quiet", no_argument, NULL, 'q'},
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{"silent", no_argument, NULL, 'q'},
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{"recursive", no_argument, NULL, 'r'},
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{"no-messages", no_argument, NULL, 's'},
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{"revert-match", no_argument, NULL, 'v'},
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{"word-regexp", no_argument, NULL, 'w'},
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{"line-regexp", no_argument, NULL, 'x'},
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{"unix-byte-offsets", no_argument, NULL, 'u'},
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#ifndef NOZ
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{"decompress", no_argument, NULL, 'Z'},
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#endif
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{NULL, no_argument, NULL, 0}
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};
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static void
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add_pattern(char *pat, size_t len)
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{
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if (!xflag && (len == 0 || matchall)) {
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matchall = 1;
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return;
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}
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if (patterns == pattern_sz) {
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pattern_sz *= 2;
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pattern = grep_realloc(pattern, ++pattern_sz * sizeof(*pattern));
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}
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if (len > 0 && pat[len - 1] == '\n')
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--len;
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/* pat may not be NUL-terminated */
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if (wflag && !Fflag) {
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int bol = 0, eol = 0, extra;
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if (pat[0] == '^')
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bol = 1;
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if (len > 0 && pat[len - 1] == '$')
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eol = 1;
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extra = Eflag ? 2 : 4;
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pattern[patterns] = grep_malloc(len + 15 + extra);
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snprintf(pattern[patterns], len + 15 + extra,
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"%s[[:<:]]%s%.*s%s[[:>:]]%s",
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bol ? "^" : "",
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Eflag ? "(" : "\\(",
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(int)len - bol - eol, pat + bol,
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Eflag ? ")" : "\\)",
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eol ? "$" : "");
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len += 14 + extra;
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} else {
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pattern[patterns] = grep_malloc(len + 1);
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memcpy(pattern[patterns], pat, len);
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pattern[patterns][len] = '\0';
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}
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++patterns;
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}
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static void
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add_patterns(char *pats)
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{
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char *nl;
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while ((nl = strchr(pats, '\n')) != NULL) {
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add_pattern(pats, nl - pats);
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pats = nl + 1;
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}
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add_pattern(pats, strlen(pats));
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}
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static void
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read_patterns(const char *fn)
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{
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FILE *f;
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char *line;
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size_t len;
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if ((f = fopen(fn, "r")) == NULL)
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err(2, "%s", fn);
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while ((line = fgetln(f, &len)) != NULL)
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add_pattern(line, *line == '\n' ? 0 : len);
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if (ferror(f))
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err(2, "%s", fn);
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fclose(f);
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}
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int
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main(int argc, char *argv[])
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{
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int c, lastc, prevoptind, newarg, i, needpattern;
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struct patfile *patfile, *pf_next;
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long l;
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char *ep;
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SLIST_INIT(&patfilelh);
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switch (getprogname()[0]) {
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case 'e':
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Eflag++;
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break;
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case 'f':
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Fflag++;
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break;
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case 'g':
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Gflag++;
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break;
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#ifndef NOZ
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case 'z':
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Zflag++;
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switch(getprogname()[1]) {
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case 'e':
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Eflag++;
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break;
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case 'f':
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Fflag++;
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break;
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case 'g':
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Gflag++;
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break;
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}
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break;
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#endif
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}
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lastc = '\0';
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newarg = 1;
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prevoptind = 1;
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needpattern = 1;
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while ((c = getopt_long(argc, argv, optstr,
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long_options, NULL)) != -1) {
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switch (c) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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if (newarg || !isdigit(lastc))
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Aflag = 0;
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else if (Aflag > INT_MAX / 10)
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errx(2, "context out of range");
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Aflag = Bflag = (Aflag * 10) + (c - '0');
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break;
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case 'A':
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case 'B':
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l = strtol(optarg, &ep, 10);
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if (ep == optarg || *ep != '\0' ||
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l <= 0 || l >= INT_MAX)
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errx(2, "context out of range");
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if (c == 'A')
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Aflag = (int)l;
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else
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Bflag = (int)l;
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break;
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case 'C':
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if (optarg == NULL)
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Aflag = Bflag = 2;
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else {
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l = strtol(optarg, &ep, 10);
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if (ep == optarg || *ep != '\0' ||
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l <= 0 || l >= INT_MAX)
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errx(2, "context out of range");
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Aflag = Bflag = (int)l;
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}
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break;
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case 'E':
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Fflag = Gflag = 0;
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Eflag++;
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break;
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case 'F':
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Eflag = Gflag = 0;
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Fflag++;
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break;
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case 'G':
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Eflag = Fflag = 0;
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Gflag++;
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break;
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case 'H':
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Hflag++;
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break;
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case 'I':
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binbehave = BIN_FILE_SKIP;
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break;
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case 'L':
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lflag = 0;
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Lflag = qflag = 1;
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break;
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case 'P':
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Pflag++;
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break;
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case 'S':
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Sflag++;
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break;
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case 'R':
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case 'r':
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Rflag++;
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oflag++;
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break;
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case 'U':
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binbehave = BIN_FILE_BIN;
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break;
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case 'V':
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fprintf(stderr, "grep version %u.%u\n", VER_MAJ, VER_MIN);
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exit(0);
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break;
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#ifndef NOZ
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case 'Z':
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Zflag++;
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break;
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#endif
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case 'a':
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binbehave = BIN_FILE_TEXT;
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break;
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case 'b':
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bflag = 1;
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break;
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case 'c':
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cflag = 1;
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break;
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case 'e':
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add_patterns(optarg);
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needpattern = 0;
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break;
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case 'f':
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patfile = grep_malloc(sizeof(*patfile));
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patfile->pf_file = optarg;
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SLIST_INSERT_HEAD(&patfilelh, patfile, pf_next);
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needpattern = 0;
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break;
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case 'h':
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oflag = 0;
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hflag = 1;
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break;
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case 'i':
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case 'y':
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iflag = 1;
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cflags |= REG_ICASE;
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break;
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case 'l':
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Lflag = 0;
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lflag = qflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case 'o':
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hflag = 0;
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oflag = 1;
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break;
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case 'q':
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qflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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case 'v':
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vflag = 1;
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break;
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case 'w':
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wflag = 1;
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break;
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case 'x':
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xflag = 1;
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break;
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case BIN_OPT:
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if (strcmp("binary", optarg) == 0)
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binbehave = BIN_FILE_BIN;
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else if (strcmp("without-match", optarg) == 0)
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binbehave = BIN_FILE_SKIP;
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else if (strcmp("text", optarg) == 0)
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binbehave = BIN_FILE_TEXT;
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else
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errx(2, "Unknown binary-files option");
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break;
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case 'u':
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case MMAP_OPT:
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/* default, compatibility */
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break;
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case LINEBUF_OPT:
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lbflag = 1;
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break;
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case HELP_OPT:
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default:
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usage();
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}
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lastc = c;
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newarg = optind != prevoptind;
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prevoptind = optind;
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}
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argc -= optind;
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argv += optind;
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for (patfile = SLIST_FIRST(&patfilelh); patfile != NULL;
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patfile = pf_next) {
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pf_next = SLIST_NEXT(patfile, pf_next);
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read_patterns(patfile->pf_file);
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free(patfile);
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}
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if (argc == 0 && needpattern)
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usage();
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if (argc != 0 && needpattern) {
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add_patterns(*argv);
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--argc;
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++argv;
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}
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if (Eflag)
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cflags |= REG_EXTENDED;
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fg_pattern = grep_calloc(patterns, sizeof(*fg_pattern));
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r_pattern = grep_calloc(patterns, sizeof(*r_pattern));
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for (i = 0; i < patterns; ++i) {
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/* Check if cheating is allowed (always is for fgrep). */
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if (Fflag) {
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fgrepcomp(&fg_pattern[i], pattern[i]);
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} else {
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if (fastcomp(&fg_pattern[i], pattern[i])) {
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/* Fall back to full regex library */
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c = regcomp(&r_pattern[i], pattern[i], cflags);
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if (c != 0) {
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regerror(c, &r_pattern[i], re_error,
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RE_ERROR_BUF);
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errx(2, "%s", re_error);
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}
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}
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}
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}
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#ifndef __minix
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if (lbflag)
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setlinebuf(stdout);
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#endif
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if ((argc == 0 || argc == 1) && !oflag)
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hflag = 1;
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if (argc == 0)
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exit(!procfile(NULL));
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if (Rflag)
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c = grep_tree(argv);
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else
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for (c = 0; argc--; ++argv)
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c += procfile(*argv);
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exit(!c);
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}
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