1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * James W. Williams of NASA Goddard Space Flight Center.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34static const char copyright[] =
35"@(#) Copyright (c) 1991, 1993\n\
36	The Regents of the University of California.  All rights reserved.\n";
37#endif /* not lint */
38
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)cksum.c	8.2 (Berkeley) 4/28/95";
42#endif
43#endif /* not lint */
44
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD$");
47
48#include <sys/types.h>
49
50#include <err.h>
51#include <fcntl.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56
57#include "extern.h"
58
59static void usage(void);
60
61int
62main(int argc, char **argv)
63{
64	uint32_t val;
65	int ch, fd, rval;
66	off_t len;
67	char *fn, *p;
68	int (*cfncn)(int, uint32_t *, off_t *);
69	void (*pfncn)(char *, uint32_t, off_t);
70
71	if ((p = strrchr(argv[0], '/')) == NULL)
72		p = argv[0];
73	else
74		++p;
75	if (!strcmp(p, "sum")) {
76		cfncn = csum1;
77		pfncn = psum1;
78		++argv;
79	} else {
80		cfncn = crc;
81		pfncn = pcrc;
82
83		while ((ch = getopt(argc, argv, "o:")) != -1)
84			switch (ch) {
85			case 'o':
86				if (!strcmp(optarg, "1")) {
87					cfncn = csum1;
88					pfncn = psum1;
89				} else if (!strcmp(optarg, "2")) {
90					cfncn = csum2;
91					pfncn = psum2;
92				} else if (!strcmp(optarg, "3")) {
93					cfncn = crc32;
94					pfncn = pcrc;
95				} else {
96					warnx("illegal argument to -o option");
97					usage();
98				}
99				break;
100			case '?':
101			default:
102				usage();
103			}
104		argc -= optind;
105		argv += optind;
106	}
107
108	fd = STDIN_FILENO;
109	fn = NULL;
110	rval = 0;
111	do {
112		if (*argv) {
113			fn = *argv++;
114			if ((fd = open(fn, O_RDONLY, 0)) < 0) {
115				warn("%s", fn);
116				rval = 1;
117				continue;
118			}
119		}
120		if (cfncn(fd, &val, &len)) {
121			warn("%s", fn ? fn : "stdin");
122			rval = 1;
123		} else
124			pfncn(fn, val, len);
125		(void)close(fd);
126	} while (*argv);
127	exit(rval);
128}
129
130static void
131usage(void)
132{
133	(void)fprintf(stderr, "usage: cksum [-o 1 | 2 | 3] [file ...]\n");
134	(void)fprintf(stderr, "       sum [file ...]\n");
135	exit(1);
136}
137