/* $NetBSD: grep.c,v 1.16 2022/10/15 21:53:22 andvar Exp $ */
/* $FreeBSD: head/usr.bin/grep/grep.c 211519 2010-08-19 22:55:17Z delphij $ */
/* $OpenBSD: grep.c,v 1.42 2010/07/02 22:18:03 tedu Exp $ */
/*-
* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
* Copyright (C) 2008-2009 Gabor Kovesdan <
[email protected]>
* 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
__RCSID("$NetBSD: grep.c,v 1.16 2022/10/15 21:53:22 andvar Exp $");
#include <sys/stat.h>
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <libgen.h>
#include <locale.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "grep.h"
#ifndef WITHOUT_NLS
#include <nl_types.h>
nl_catd catalog;
#endif
/*
* Default messages to use when NLS is disabled or no catalogue
* is found.
*/
const char *errstr[] = {
"",
/* 1*/ "(standard input)",
/* 2*/ "cannot read bzip2 compressed file",
/* 3*/ "unknown %s option",
/* 4*/ "usage: %s [-abcDEFGHhIiJLlmnOoPqRSsUVvwxZz] [-A num] [-B num] [-C[num]]\n",
/* 5*/ "\t[-e pattern] [-f file] [--binary-files=value] [--color=when]\n",
/* 6*/ "\t[--context[=num]] [--directories=action] [--label] [--line-buffered]\n",
/* 7*/ "\t[pattern] [file ...]\n",
/* 8*/ "Binary file %s matches\n",
/* 9*/ "%s (BSD grep) %s\n",
};
/* Flags passed to regcomp() and regexec() */
int cflags = 0;
int eflags = REG_STARTEND;
/* Searching patterns */
unsigned int patterns, pattern_sz;
char **pattern;
regex_t *r_pattern;
fastgrep_t *fg_pattern;
/* Filename exclusion/inclusion patterns */
unsigned int fpatterns, fpattern_sz;
unsigned int dpatterns, dpattern_sz;
struct epat *dpattern, *fpattern;
/* For regex errors */
char re_error[RE_ERROR_BUF + 1];
/* Command-line flags */
unsigned long long Aflag; /* -A x: print x lines trailing each match */
unsigned long long Bflag; /* -B x: print x lines leading each match */
bool Hflag; /* -H: always print file name */
bool Lflag; /* -L: only show names of files with no matches */
bool bflag; /* -b: show block numbers for each match */
bool cflag; /* -c: only show a count of matching lines */
bool hflag; /* -h: don't print filename headers */
bool iflag; /* -i: ignore case */
bool lflag; /* -l: only show names of files with matches */
bool mflag; /* -m x: stop reading the files after x matches */
unsigned long long mcount; /* count for -m */
bool nflag; /* -n: show line numbers in front of matching lines */
bool oflag; /* -o: print only matching part */
bool qflag; /* -q: quiet mode (don't output anything) */
bool sflag; /* -s: silent mode (ignore errors) */
bool vflag; /* -v: only show non-matching lines */
bool wflag; /* -w: pattern must start and end on word boundaries */
bool xflag; /* -x: pattern must match entire line */
bool lbflag; /* --line-buffered */
bool nullflag; /* --null */
bool nulldataflag; /* --null-data */
unsigned char line_sep = '\n'; /* 0 for --null-data */
char *label; /* --label */
const char *color; /* --color */
int grepbehave = GREP_BASIC; /* -EFGP: type of the regex */
int binbehave = BINFILE_BIN; /* -aIU: handling of binary files */
int filebehave = FILE_STDIO; /* -JZ: normal, gzip or bzip2 file */
int devbehave = DEV_READ; /* -D: handling of devices */
int dirbehave = DIR_READ; /* -dRr: handling of directories */
int linkbehave = LINK_READ; /* -OpS: handling of symlinks */
bool dexclude, dinclude; /* --exclude-dir and --include-dir */
bool fexclude, finclude; /* --exclude and --include */
enum {
BIN_OPT = CHAR_MAX + 1,
COLOR_OPT,
DECOMPRESS_OPT,
HELP_OPT,
MMAP_OPT,
LINEBUF_OPT,
LABEL_OPT,
R_EXCLUDE_OPT,
R_INCLUDE_OPT,
R_DEXCLUDE_OPT,
R_DINCLUDE_OPT
};
static inline const char *init_color(const char *);
/* Housekeeping */
int tail; /* lines left to print */
bool notfound; /* file not found */
extern char *__progname;
/*
* Prints usage information and returns 2.
*/
__dead static void
usage(void)
{
fprintf(stderr, getstr(4), __progname);
fprintf(stderr, "%s", getstr(5));
fprintf(stderr, "%s", getstr(6));
fprintf(stderr, "%s", getstr(7));
exit(2);
}
static const char optstr[] =
"0123456789A:B:C:D:EFGHIJLOPSRUVZabcd:e:f:hilm:nopqrsuvwxyz";
struct option long_options[] =
{
{"binary-files", required_argument, NULL, BIN_OPT},
#ifndef WITHOUT_GZIP
{"decompress", no_argument, NULL, DECOMPRESS_OPT},
#endif
{"help", no_argument, NULL, HELP_OPT},
{"mmap", no_argument, NULL, MMAP_OPT},
{"line-buffered", no_argument, NULL, LINEBUF_OPT},
{"label", required_argument, NULL, LABEL_OPT},
{"color", optional_argument, NULL, COLOR_OPT},
{"colour", optional_argument, NULL, COLOR_OPT},
{"exclude", required_argument, NULL, R_EXCLUDE_OPT},
{"include", required_argument, NULL, R_INCLUDE_OPT},
{"exclude-dir", required_argument, NULL, R_DEXCLUDE_OPT},
{"include-dir", required_argument, NULL, R_DINCLUDE_OPT},
{"after-context", required_argument, NULL, 'A'},
{"text", no_argument, NULL, 'a'},
{"before-context", required_argument, NULL, 'B'},
{"byte-offset", no_argument, NULL, 'b'},
{"context", optional_argument, NULL, 'C'},
{"count", no_argument, NULL, 'c'},
{"devices", required_argument, NULL, 'D'},
{"directories", required_argument, NULL, 'd'},
{"extended-regexp", no_argument, NULL, 'E'},
{"regexp", required_argument, NULL, 'e'},
{"fixed-strings", no_argument, NULL, 'F'},
{"file", required_argument, NULL, 'f'},
{"basic-regexp", no_argument, NULL, 'G'},
{"no-filename", no_argument, NULL, 'h'},
{"with-filename", no_argument, NULL, 'H'},
{"ignore-case", no_argument, NULL, 'i'},
#ifndef WITHOUT_BZ2
{"bz2decompress", no_argument, NULL, 'J'},
#endif
{"files-with-matches", no_argument, NULL, 'l'},
{"files-without-match", no_argument, NULL, 'L'},
{"max-count", required_argument, NULL, 'm'},
{"line-number", no_argument, NULL, 'n'},
{"only-matching", no_argument, NULL, 'o'},
{"quiet", no_argument, NULL, 'q'},
{"silent", no_argument, NULL, 'q'},
{"recursive", no_argument, NULL, 'r'},
{"no-messages", no_argument, NULL, 's'},
{"binary", no_argument, NULL, 'U'},
{"unix-byte-offsets", no_argument, NULL, 'u'},
{"invert-match", no_argument, NULL, 'v'},
{"version", no_argument, NULL, 'V'},
{"word-regexp", no_argument, NULL, 'w'},
{"line-regexp", no_argument, NULL, 'x'},
{"null", no_argument, NULL, 'Z'},
{"null-data", no_argument, NULL, 'z'},
{NULL, no_argument, NULL, 0}
};
/*
* Adds a searching pattern to the internal array.
*/
static void
add_pattern(char *pat, size_t len)
{
/* TODO: Check for empty patterns and shortcut */
/* Increase size if necessary */
if (patterns == pattern_sz) {
pattern_sz *= 2;
pattern = grep_realloc(pattern, ++pattern_sz *
sizeof(*pattern));
}
if (len > 0 && pat[len - 1] == '\n')
--len;
/* pat may not be NUL-terminated */
pattern[patterns] = grep_malloc(len + 1);
memcpy(pattern[patterns], pat, len);
pattern[patterns][len] = '\0';
++patterns;
}
/*
* Adds a file include/exclude pattern to the internal array.
*/
static void
add_fpattern(const char *pat, int mode)
{
/* Increase size if necessary */
if (fpatterns == fpattern_sz) {
fpattern_sz *= 2;
fpattern = grep_realloc(fpattern, ++fpattern_sz *
sizeof(struct epat));
}
fpattern[fpatterns].pat = grep_strdup(pat);
fpattern[fpatterns].mode = mode;
++fpatterns;
}
/*
* Adds a directory include/exclude pattern to the internal array.
*/
static void
add_dpattern(const char *pat, int mode)
{
/* Increase size if necessary */
if (dpatterns == dpattern_sz) {
dpattern_sz *= 2;
dpattern = grep_realloc(dpattern, ++dpattern_sz *
sizeof(struct epat));
}
dpattern[dpatterns].pat = grep_strdup(pat);
dpattern[dpatterns].mode = mode;
++dpatterns;
}
/*
* Reads searching patterns from a file and adds them with add_pattern().
*/
static void
read_patterns(const char *fn)
{
FILE *f;
char *line;
size_t len;
ssize_t rlen;
if ((f = fopen(fn, "r")) == NULL)
err(2, "%s", fn);
line = NULL;
len = 0;
while ((rlen = getline(&line, &len, f)) != -1)
add_pattern(line, *line == '\n' ? 0 : (size_t)rlen);
free(line);
if (ferror(f))
err(2, "%s", fn);
fclose(f);
}
static inline const char *
init_color(const char *d)
{
char *c;
c = getenv("GREP_COLOR");
return (c != NULL ? c : d);
}
int
main(int argc, char *argv[])
{
char **aargv, **eargv, *eopts;
char *ep;
unsigned long long l;
unsigned int aargc, eargc, i, j;
int c, lastc, needpattern, newarg, prevoptind;
setlocale(LC_ALL, "");
#ifndef WITHOUT_NLS
catalog = catopen("grep", NL_CAT_LOCALE);
#endif
/* Check what is the program name of the binary. In this
way we can have all the functionalities in one binary
without the need of scripting and using ugly hacks. */
switch (__progname[0]) {
case 'e':
grepbehave = GREP_EXTENDED;
break;
case 'f':
grepbehave = GREP_FIXED;
break;
case 'g':
grepbehave = GREP_BASIC;
break;
#ifndef WITHOUT_GZIP
case 'z':
filebehave = FILE_GZIP;
switch(__progname[1]) {
case 'e':
grepbehave = GREP_EXTENDED;
break;
case 'f':
grepbehave = GREP_FIXED;
break;
case 'g':
grepbehave = GREP_BASIC;
break;
}
break;
#endif
}
lastc = '\0';
newarg = 1;
prevoptind = 1;
needpattern = 1;
eopts = getenv("GREP_OPTIONS");
/* support for extra arguments in GREP_OPTIONS */
eargc = 0;
if (eopts != NULL) {
char *str;
/* make an estimation of how many extra arguments we have */
for (j = 0; j < strlen(eopts); j++)
if (eopts[j] == ' ')
eargc++;
eargv = (char **)grep_malloc(sizeof(char *) * (eargc + 1));
eargc = 0;
/* parse extra arguments */
while ((str = strsep(&eopts, " ")) != NULL)
eargv[eargc++] = grep_strdup(str);
aargv = (char **)grep_calloc(eargc + argc + 1,
sizeof(char *));
aargv[0] = argv[0];
for (i = 0; i < eargc; i++)
aargv[i + 1] = eargv[i];
for (j = 1; j < (unsigned int)argc; j++, i++)
aargv[i + 1] = argv[j];
aargc = eargc + argc;
} else {
aargv = argv;
aargc = argc;
}
while (((c = getopt_long(aargc, aargv, optstr, long_options, NULL)) !=
-1)) {
switch (c) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (newarg || !isdigit(lastc))
Aflag = 0;
else if (Aflag > LLONG_MAX / 10) {
errno = ERANGE;
err(2, NULL);
}
Aflag = Bflag = (Aflag * 10) + (c - '0');
break;
case 'C':
if (optarg == NULL) {
Aflag = Bflag = 2;
break;
}
/* FALLTHROUGH */
case 'A':
/* FALLTHROUGH */
case 'B':
errno = 0;
l = strtoull(optarg, &ep, 10);
if (((errno == ERANGE) && (l == ULLONG_MAX)) ||
((errno == EINVAL) && (l == 0)))
err(2, NULL);
else if (ep[0] != '\0') {
errno = EINVAL;
err(2, NULL);
}
if (c == 'A')
Aflag = l;
else if (c == 'B')
Bflag = l;
else
Aflag = Bflag = l;
break;
case 'a':
binbehave = BINFILE_TEXT;
break;
case 'b':
bflag = true;
break;
case 'c':
cflag = true;
break;
case 'D':
if (strcasecmp(optarg, "skip") == 0)
devbehave = DEV_SKIP;
else if (strcasecmp(optarg, "read") == 0)
devbehave = DEV_READ;
else
errx(2, getstr(3), "--devices");
break;
case 'd':
if (strcasecmp("recurse", optarg) == 0) {
Hflag = true;
dirbehave = DIR_RECURSE;
} else if (strcasecmp("skip", optarg) == 0)
dirbehave = DIR_SKIP;
else if (strcasecmp("read", optarg) == 0)
dirbehave = DIR_READ;
else
errx(2, getstr(3), "--directories");
break;
case 'E':
grepbehave = GREP_EXTENDED;
break;
case 'e':
add_pattern(optarg, strlen(optarg));
needpattern = 0;
break;
case 'F':
grepbehave = GREP_FIXED;
break;
case 'f':
read_patterns(optarg);
needpattern = 0;
break;
case 'G':
grepbehave = GREP_BASIC;
break;
case 'H':
Hflag = true;
break;
case 'h':
Hflag = false;
hflag = true;
break;
case 'I':
binbehave = BINFILE_SKIP;
break;
case 'i':
case 'y':
iflag = true;
cflags |= REG_ICASE;
break;
#ifndef WITHOUT_BZ2
case 'J':
filebehave = FILE_BZIP;
break;
#endif
case 'L':
lflag = false;
Lflag = true;
break;
case 'l':
Lflag = false;
lflag = true;
break;
case 'm':
mflag = true;
errno = 0;
mcount = strtoull(optarg, &ep, 10);
if (((errno == ERANGE) && (mcount == ULLONG_MAX)) ||
((errno == EINVAL) && (mcount == 0)))
err(2, NULL);
else if (ep[0] != '\0') {
errno = EINVAL;
err(2, NULL);
}
break;
case 'n':
nflag = true;
break;
case 'O':
linkbehave = LINK_EXPLICIT;
break;
case 'o':
oflag = true;
break;
case 'p':
linkbehave = LINK_SKIP;
break;
case 'q':
qflag = true;
break;
case 'S':
linkbehave = LINK_READ;
break;
case 'R':
case 'r':
dirbehave = DIR_RECURSE;
Hflag = true;
break;
case 's':
sflag = true;
break;
case 'U':
binbehave = BINFILE_BIN;
break;
case 'u':
case MMAP_OPT:
/* noop, compatibility */
break;
case 'V':
printf(getstr(9), __progname, VERSION);
exit(0);
case 'v':
vflag = true;
break;
case 'w':
wflag = true;
break;
case 'x':
xflag = true;
break;
case 'Z':
nullflag = true;
break;
case 'z':
nulldataflag = true;
line_sep = '\0';
break;
case BIN_OPT:
if (strcasecmp("binary", optarg) == 0)
binbehave = BINFILE_BIN;
else if (strcasecmp("without-match", optarg) == 0)
binbehave = BINFILE_SKIP;
else if (strcasecmp("text", optarg) == 0)
binbehave = BINFILE_TEXT;
else
errx(2, getstr(3), "--binary-files");
break;
case COLOR_OPT:
color = NULL;
if (optarg == NULL || strcasecmp("auto", optarg) == 0 ||
strcasecmp("tty", optarg) == 0 ||
strcasecmp("if-tty", optarg) == 0) {
char *term;
term = getenv("TERM");
if (isatty(STDOUT_FILENO) && term != NULL &&
strcasecmp(term, "dumb") != 0)
color = init_color("01;31");
} else if (strcasecmp("always", optarg) == 0 ||
strcasecmp("yes", optarg) == 0 ||
strcasecmp("force", optarg) == 0) {
color = init_color("01;31");
} else if (strcasecmp("never", optarg) != 0 &&
strcasecmp("none", optarg) != 0 &&
strcasecmp("no", optarg) != 0)
errx(2, getstr(3), "--color");
break;
#ifndef WITHOUT_GZIP
case DECOMPRESS_OPT:
filebehave = FILE_GZIP;
break;
#endif
case LABEL_OPT:
label = optarg;
break;
case LINEBUF_OPT:
lbflag = true;
break;
case R_INCLUDE_OPT:
finclude = true;
add_fpattern(optarg, INCL_PAT);
break;
case R_EXCLUDE_OPT:
fexclude = true;
add_fpattern(optarg, EXCL_PAT);
break;
case R_DINCLUDE_OPT:
dinclude = true;
add_dpattern(optarg, INCL_PAT);
break;
case R_DEXCLUDE_OPT:
dexclude = true;
add_dpattern(optarg, EXCL_PAT);
break;
case HELP_OPT:
default:
usage();
}
lastc = c;
newarg = optind != prevoptind;
prevoptind = optind;
}
aargc -= optind;
aargv += optind;
/* Fail if we don't have any pattern */
if (aargc == 0 && needpattern)
usage();
/* Process patterns from command line */
if (aargc != 0 && needpattern) {
add_pattern(*aargv, strlen(*aargv));
--aargc;
++aargv;
}
switch (grepbehave) {
case GREP_FIXED:
case GREP_BASIC:
break;
case GREP_EXTENDED:
cflags |= REG_EXTENDED;
break;
default:
/* NOTREACHED */
usage();
}
fg_pattern = grep_calloc(patterns, sizeof(*fg_pattern));
r_pattern = grep_calloc(patterns, sizeof(*r_pattern));
/*
* XXX: fgrepcomp() and fastcomp() are workarounds for regexec() performance.
* Optimizations should be done there.
*/
/* Check if cheating is allowed (always is for fgrep). */
if (grepbehave == GREP_FIXED) {
for (i = 0; i < patterns; ++i)
fgrepcomp(&fg_pattern[i], pattern[i]);
} else {
for (i = 0; i < patterns; ++i) {
if (fastcomp(&fg_pattern[i], pattern[i])) {
/* Fall back to full regex library */
c = regcomp(&r_pattern[i], pattern[i], cflags);
if (c != 0) {
regerror(c, &r_pattern[i], re_error,
RE_ERROR_BUF);
errx(2, "%s", re_error);
}
}
}
}
if (lbflag) {
#ifdef _IOLBF
setvbuf(stdout, NULL, _IOLBF, 0);
#else
setlinebuf(stdout);
#endif
}
if ((aargc == 0 || aargc == 1) && !Hflag)
hflag = true;
if (aargc == 0)
exit(!procfile("-"));
if (dirbehave == DIR_RECURSE)
c = grep_tree(aargv);
else
for (c = 0; aargc--; ++aargv) {
if ((finclude || fexclude) && !file_matching(*aargv))
continue;
c+= procfile(*aargv);
}
#ifndef WITHOUT_NLS
catclose(catalog);
#endif
/* Find out the correct return value according to the
results and the command line option. */
exit(c ? (notfound ? (qflag ? 0 : 2) : 0) : (notfound ? 2 : 1));
}
