File: [local] / src / usr.bin / grep / grep.c (download)
Revision 1.4, Sun Jun 22 22:23:06 2003 UTC (20 years, 11 months ago) by deraadt
Branch: MAIN
Changes since 1.3: +12 -1 lines
support z{e,f}grep
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/*-
* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: grep.c,v 1.4 2003/06/22 22:23:06 deraadt Exp $
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "grep.h"
/* Flags passed to regcomp() and regexec() */
int cflags;
int eflags = REG_STARTEND;
int matchall; /* shortcut */
int patterns, pattern_sz;
char **pattern;
regex_t *r_pattern;
/* For regex errors */
char re_error[RE_ERROR_BUF + 1];
/* Command-line flags */
int Aflag; /* -A x: print x lines trailing each match */
int Bflag; /* -B x: print x lines leading each match */
int Eflag; /* -E: interpret pattern as extended regexp */
int Fflag; /* -F: interpret pattern as list of fixed strings */
int Gflag; /* -G: interpret pattern as basic regexp */
int Hflag; /* -H: if -R, follow explicitly listed symlinks */
int Lflag; /* -L: only show names of files with no matches */
int Pflag; /* -P: if -R, no symlinks are followed */
int Rflag; /* -R: recursively search directory trees */
int Sflag; /* -S: if -R, follow all symlinks */
int Vflag; /* -V: display version information */
int Zflag; /* -Z: decompress input before processing */
int aflag; /* -a: only search ascii files */
int bflag; /* -b: show block numbers for each match */
int cflag; /* -c: only show a count of matching lines */
int hflag; /* -h: don't print filename headers */
int iflag; /* -i: ignore case */
int lflag; /* -l: only show names of files with matches */
int nflag; /* -n: show line numbers in front of matching lines */
int oflag; /* -o: always print file name */
int qflag; /* -q: quiet mode (don't output anything) */
int sflag; /* -s: silent mode (ignore errors) */
int vflag; /* -v: only show non-matching lines */
int wflag; /* -w: pattern must start and end on word boundaries */
int xflag; /* -x: pattern must match entire line */
/* Housekeeping */
int first; /* flag whether or not this is our fist match */
int tail; /* lines left to print */
int lead; /* number of lines in leading context queue */
char *progname;
static void
usage(void)
{
fprintf(stderr, "usage: %s %s %s\n",
progname,
"[-[AB] num] [-CEFGHLPRSVZabchilnoqsvwx]",
"[-e patttern] [-f file]");
exit(2);
}
static char *optstr = "0123456789A:B:CEFGHLPSRUVZabce:f:hilnoqrsuvwxy";
struct option long_options[] =
{
{"basic-regexp", no_argument, NULL, 'G'},
{"extended-regexp", no_argument, NULL, 'E'},
{"fixed-strings", no_argument, NULL, 'F'},
{"after-context", required_argument, NULL, 'A'},
{"before-context", required_argument, NULL, 'B'},
{"context", optional_argument, NULL, 'C'},
{"version", no_argument, NULL, 'V'},
{"byte-offset", no_argument, NULL, 'b'},
{"count", no_argument, NULL, 'c'},
{"regexp", required_argument, NULL, 'e'},
{"file", required_argument, NULL, 'f'},
{"no-filename", no_argument, NULL, 'h'},
{"ignore-case", no_argument, NULL, 'i'},
{"files-without-match", no_argument, NULL, 'L'},
{"files-with-matches", no_argument, NULL, 'l'},
{"line-number", no_argument, NULL, 'n'},
{"quiet", no_argument, NULL, 'q'},
{"silent", no_argument, NULL, 'q'},
{"recursive", no_argument, NULL, 'r'},
{"no-messages", no_argument, NULL, 's'},
{"text", no_argument, NULL, 'a'},
{"revert-match", no_argument, NULL, 'v'},
{"word-regexp", no_argument, NULL, 'w'},
{"line-regexp", no_argument, NULL, 'x'},
{"binary", no_argument, NULL, 'U'},
{"unix-byte-offsets", no_argument, NULL, 'u'},
{"decompress", no_argument, NULL, 'Z'},
{NULL, no_argument, NULL, 0}
};
static void
add_pattern(char *pat, size_t len)
{
if (len == 0 || matchall) {
matchall = 1;
return;
}
if (patterns == pattern_sz) {
pattern_sz *= 2;
pattern = grep_realloc(pattern, ++pattern_sz);
}
if (pat[len-1] == '\n')
--len;
pattern[patterns] = grep_malloc(len+1);
strncpy(pattern[patterns], pat, len);
pattern[patterns][len] = '\0';
++patterns;
}
static void
read_patterns(char *fn)
{
FILE *f;
char *line;
size_t len;
int nl;
if ((f = fopen(fn, "r")) == NULL)
err(1, "%s", fn);
nl = 0;
while ((line = fgetln(f, &len)) != NULL) {
if (*line == '\n') {
++nl;
continue;
}
if (nl) {
matchall = 1;
break;
}
nl = 0;
add_pattern(line, len);
}
if (ferror(f))
err(1, "%s", fn);
fclose(f);
}
int
main(int argc, char *argv[])
{
char *tmp;
int c, i;
if ((progname = strrchr(*argv, '/')) != NULL)
++progname;
else
progname = *argv;
while ((c = getopt_long(argc, argv, optstr,
long_options, (int *)NULL)) != -1) {
switch (c) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
tmp = argv[optind - 1];
if (tmp[0] == '-' && tmp[1] == c && !tmp[2])
Aflag = Bflag = strtol(++tmp, (char **)NULL, 10);
else
Aflag = Bflag = strtol(argv[optind] + 1, (char **)NULL, 10);
break;
case 'A':
Aflag = strtol(optarg, (char **)NULL, 10);
break;
case 'B':
Bflag = strtol(optarg, (char **)NULL, 10);
break;
case 'C':
if (optarg == NULL)
Aflag = Bflag = 2;
else
Aflag = Bflag = strtol(optarg, (char **)NULL, 10);
break;
case 'E':
Eflag++;
break;
case 'F':
Fflag++;
break;
case 'G':
Gflag++;
break;
case 'H':
Hflag++;
break;
case 'L':
lflag = 0;
Lflag = qflag = 1;
break;
case 'P':
Pflag++;
break;
case 'S':
Sflag++;
break;
case 'R':
case 'r':
Rflag++;
oflag++;
break;
case 'U':
case 'u':
/* these are here for compatability */
break;
case 'V':
fprintf(stderr, "grep version %u.%u\n", VER_MAJ, VER_MIN);
fprintf(stderr, argv[0]);
usage();
break;
case 'Z':
Zflag++;
break;
case 'a':
aflag = 1;
break;
case 'b':
bflag = 1;
break;
case 'c':
cflag = 1;
break;
case 'e':
add_pattern(optarg, strlen(optarg));
break;
case 'f':
read_patterns(optarg);
break;
case 'h':
oflag = 0;
hflag = 1;
break;
case 'i':
case 'y':
cflags |= REG_ICASE;
break;
case 'l':
Lflag = 0;
lflag = qflag = 1;
break;
case 'n':
nflag = 1;
break;
case 'o':
hflag = 0;
oflag = 1;
break;
case 'q':
qflag = 1;
break;
case 's':
sflag = 1;
break;
case 'v':
vflag = 1;
break;
case 'w':
wflag = 1;
break;
case 'x':
xflag = 1;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc == 0 && patterns == 0)
usage();
if (patterns == 0) {
add_pattern(*argv, strlen(*argv));
--argc;
++argv;
}
switch (*progname) {
case 'e':
Eflag++;
break;
case 'f':
Fflag++;
break;
case 'g':
Gflag++;
break;
case 'z':
Zflag++;
switch(progname[1]) {
case 'e':
Eflag++;
break;
case 'f':
Fflag++;
break;
case 'g':
Gflag++;
break;
}
break;
}
cflags |= Eflag ? REG_EXTENDED : REG_BASIC;
r_pattern = grep_malloc(patterns * sizeof(regex_t));
for (i = 0; i < patterns; ++i) {
if ((c = regcomp(&r_pattern[i], pattern[i], cflags))) {
regerror(c, &r_pattern[i], re_error, RE_ERROR_BUF);
errx(1, "%s", re_error);
}
}
if ((argc == 0 || argc == 1) && !oflag)
hflag = 1;
if (argc == 0)
exit(!procfile(NULL));
if (Rflag)
c = grep_tree(argv);
else
for (c = 0; argc--; ++argv)
c += procfile(*argv);
exit(!c);
}