cksum.c revision 179024 
1274453Sbapt/*-
2274453Sbapt * Copyright (c) 1991, 1993
3274632Sbrd *	The Regents of the University of California.  All rights reserved.
4274632Sbrd *
5274632Sbrd * This code is derived from software contributed to Berkeley by
6274632Sbrd * James W. Williams of NASA Goddard Space Flight Center.
7274453Sbapt *
8274453Sbapt * Redistribution and use in source and binary forms, with or without
9274632Sbrd * modification, are permitted provided that the following conditions
10274632Sbrd * are met:
11274453Sbapt * 1. Redistributions of source code must retain the above copyright
12274453Sbapt *    notice, this list of conditions and the following disclaimer.
13274453Sbapt * 2. Redistributions in binary form must reproduce the above copyright
14274453Sbapt *    notice, this list of conditions and the following disclaimer in the
15274453Sbapt *    documentation and/or other materials provided with the distribution.
16274632Sbrd * 3. All advertising materials mentioning features or use of this software
17274453Sbapt *    must display the following acknowledgement:
18274453Sbapt *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1991, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)cksum.c	8.2 (Berkeley) 4/28/95";
46#endif
47#endif /* not lint */
48
49#include <sys/cdefs.h>
50__FBSDID("$FreeBSD: head/usr.bin/cksum/cksum.c 179024 2008-05-15 20:04:36Z brooks $");
51
52#include <sys/types.h>
53
54#include <err.h>
55#include <fcntl.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60
61#include "extern.h"
62
63static void usage(void);
64
65int
66main(int argc, char **argv)
67{
68	uint32_t val;
69	int ch, fd, rval;
70	off_t len;
71	char *fn, *p;
72	int (*cfncn)(int, uint32_t *, off_t *);
73	void (*pfncn)(char *, uint32_t, off_t);
74
75	if ((p = rindex(argv[0], '/')) == NULL)
76		p = argv[0];
77	else
78		++p;
79	if (!strcmp(p, "sum")) {
80		cfncn = csum1;
81		pfncn = psum1;
82		++argv;
83	} else {
84		cfncn = crc;
85		pfncn = pcrc;
86
87		while ((ch = getopt(argc, argv, "o:")) != -1)
88			switch (ch) {
89			case 'o':
90				if (!strcmp(optarg, "1")) {
91					cfncn = csum1;
92					pfncn = psum1;
93				} else if (!strcmp(optarg, "2")) {
94					cfncn = csum2;
95					pfncn = psum2;
96				} else if (!strcmp(optarg, "3")) {
97					cfncn = crc32;
98					pfncn = pcrc;
99				} else {
100					warnx("illegal argument to -o option");
101					usage();
102				}
103				break;
104			case '?':
105			default:
106				usage();
107			}
108		argc -= optind;
109		argv += optind;
110	}
111
112	fd = STDIN_FILENO;
113	fn = NULL;
114	rval = 0;
115	do {
116		if (*argv) {
117			fn = *argv++;
118			if ((fd = open(fn, O_RDONLY, 0)) < 0) {
119				warn("%s", fn);
120				rval = 1;
121				continue;
122			}
123		}
124		if (cfncn(fd, &val, &len)) {
125			warn("%s", fn ? fn : "stdin");
126			rval = 1;
127		} else
128			pfncn(fn, val, len);
129		(void)close(fd);
130	} while (*argv);
131	exit(rval);
132}
133
134static void
135usage(void)
136{
137	(void)fprintf(stderr, "usage: cksum [-o 1 | 2 | 3] [file ...]\n");
138	(void)fprintf(stderr, "       sum [file ...]\n");
139	exit(1);
140}
141