xref: /minix3/minix/usr.bin/grep/binary.c (revision d794ecc9efbcfa044947fd20468ba1f184b357e7)
1*d794ecc9SDavid van Moolenbroek /*	$OpenBSD: binary.c,v 1.18 2013/11/12 22:50:42 deraadt Exp $	*/
2*d794ecc9SDavid van Moolenbroek 
3*d794ecc9SDavid van Moolenbroek /*-
4*d794ecc9SDavid van Moolenbroek  * Copyright (c) 1999 James Howard and Dag-Erling Co�dan Sm�rgrav
5*d794ecc9SDavid van Moolenbroek  * All rights reserved.
6*d794ecc9SDavid van Moolenbroek  *
7*d794ecc9SDavid van Moolenbroek  * Redistribution and use in source and binary forms, with or without
8*d794ecc9SDavid van Moolenbroek  * modification, are permitted provided that the following conditions
9*d794ecc9SDavid van Moolenbroek  * are met:
10*d794ecc9SDavid van Moolenbroek  * 1. Redistributions of source code must retain the above copyright
11*d794ecc9SDavid van Moolenbroek  *    notice, this list of conditions and the following disclaimer.
12*d794ecc9SDavid van Moolenbroek  * 2. Redistributions in binary form must reproduce the above copyright
13*d794ecc9SDavid van Moolenbroek  *    notice, this list of conditions and the following disclaimer in the
14*d794ecc9SDavid van Moolenbroek  *    documentation and/or other materials provided with the distribution.
15*d794ecc9SDavid van Moolenbroek  *
16*d794ecc9SDavid van Moolenbroek  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17*d794ecc9SDavid van Moolenbroek  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18*d794ecc9SDavid van Moolenbroek  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19*d794ecc9SDavid van Moolenbroek  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20*d794ecc9SDavid van Moolenbroek  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21*d794ecc9SDavid van Moolenbroek  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22*d794ecc9SDavid van Moolenbroek  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23*d794ecc9SDavid van Moolenbroek  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24*d794ecc9SDavid van Moolenbroek  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25*d794ecc9SDavid van Moolenbroek  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26*d794ecc9SDavid van Moolenbroek  * SUCH DAMAGE.
27*d794ecc9SDavid van Moolenbroek  */
28*d794ecc9SDavid van Moolenbroek 
29*d794ecc9SDavid van Moolenbroek #include <ctype.h>
30*d794ecc9SDavid van Moolenbroek #include <err.h>
31*d794ecc9SDavid van Moolenbroek #include <stdio.h>
32*d794ecc9SDavid van Moolenbroek #include <string.h>
33*d794ecc9SDavid van Moolenbroek #include <zlib.h>
34*d794ecc9SDavid van Moolenbroek 
35*d794ecc9SDavid van Moolenbroek #include "grep.h"
36*d794ecc9SDavid van Moolenbroek 
37*d794ecc9SDavid van Moolenbroek static int
isbinary(const char * buf,size_t n)38*d794ecc9SDavid van Moolenbroek isbinary(const char *buf, size_t n)
39*d794ecc9SDavid van Moolenbroek {
40*d794ecc9SDavid van Moolenbroek 	return (memchr(buf, '\0', n) != NULL);
41*d794ecc9SDavid van Moolenbroek }
42*d794ecc9SDavid van Moolenbroek 
43*d794ecc9SDavid van Moolenbroek int
bin_file(FILE * f)44*d794ecc9SDavid van Moolenbroek bin_file(FILE *f)
45*d794ecc9SDavid van Moolenbroek {
46*d794ecc9SDavid van Moolenbroek 	char		buf[BUFSIZ];
47*d794ecc9SDavid van Moolenbroek 	size_t		m;
48*d794ecc9SDavid van Moolenbroek 	int		ret = 0;
49*d794ecc9SDavid van Moolenbroek 
50*d794ecc9SDavid van Moolenbroek 	if (fseek(f, 0L, SEEK_SET) == -1)
51*d794ecc9SDavid van Moolenbroek 		return 0;
52*d794ecc9SDavid van Moolenbroek 
53*d794ecc9SDavid van Moolenbroek 	if ((m = fread(buf, 1, BUFSIZ, f)) == 0)
54*d794ecc9SDavid van Moolenbroek 		return 0;
55*d794ecc9SDavid van Moolenbroek 
56*d794ecc9SDavid van Moolenbroek 	if (isbinary(buf, m))
57*d794ecc9SDavid van Moolenbroek 		ret = 1;
58*d794ecc9SDavid van Moolenbroek 
59*d794ecc9SDavid van Moolenbroek 	rewind(f);
60*d794ecc9SDavid van Moolenbroek 	return ret;
61*d794ecc9SDavid van Moolenbroek }
62*d794ecc9SDavid van Moolenbroek 
63*d794ecc9SDavid van Moolenbroek #ifndef NOZ
64*d794ecc9SDavid van Moolenbroek int
gzbin_file(gzFile * f)65*d794ecc9SDavid van Moolenbroek gzbin_file(gzFile *f)
66*d794ecc9SDavid van Moolenbroek {
67*d794ecc9SDavid van Moolenbroek 	char		buf[BUFSIZ];
68*d794ecc9SDavid van Moolenbroek 	int		m;
69*d794ecc9SDavid van Moolenbroek 	int		ret = 0;
70*d794ecc9SDavid van Moolenbroek 
71*d794ecc9SDavid van Moolenbroek 	if (gzseek(f, (z_off_t)0, SEEK_SET) == -1)
72*d794ecc9SDavid van Moolenbroek 		return 0;
73*d794ecc9SDavid van Moolenbroek 
74*d794ecc9SDavid van Moolenbroek 	if ((m = gzread(f, buf, BUFSIZ)) <= 0)
75*d794ecc9SDavid van Moolenbroek 		return 0;
76*d794ecc9SDavid van Moolenbroek 
77*d794ecc9SDavid van Moolenbroek 	if (isbinary(buf, m))
78*d794ecc9SDavid van Moolenbroek 		ret = 1;
79*d794ecc9SDavid van Moolenbroek 
80*d794ecc9SDavid van Moolenbroek 	if (gzrewind(f) != 0)
81*d794ecc9SDavid van Moolenbroek 		err(1, "gzbin_file");
82*d794ecc9SDavid van Moolenbroek 	return ret;
83*d794ecc9SDavid van Moolenbroek }
84*d794ecc9SDavid van Moolenbroek #endif
85*d794ecc9SDavid van Moolenbroek 
86*d794ecc9SDavid van Moolenbroek #ifndef SMALL
87*d794ecc9SDavid van Moolenbroek int
mmbin_file(mmf_t * f)88*d794ecc9SDavid van Moolenbroek mmbin_file(mmf_t *f)
89*d794ecc9SDavid van Moolenbroek {
90*d794ecc9SDavid van Moolenbroek 	/* XXX knows too much about mmf internals */
91*d794ecc9SDavid van Moolenbroek 	return isbinary(f->base, f->len < BUFSIZ ? f->len : BUFSIZ);
92*d794ecc9SDavid van Moolenbroek }
93*d794ecc9SDavid van Moolenbroek #endif
94