cksum.c revision 27223 
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 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	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
47static const char rcsid[] =
48	"$Id$";
49#endif /* not lint */
50
51#include <sys/cdefs.h>
52#include <sys/types.h>
53
54#include <err.h>
55#include <errno.h>
56#include <fcntl.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <unistd.h>
61
62#include "extern.h"
63
64static void usage __P((void));
65
66int
67main(argc, argv)
68	int argc;
69	char **argv;
70{
71	register int ch, fd, rval;
72	u_long len, val;
73	char *fn, *p;
74	int (*cfncn) __P((int, unsigned long *, unsigned long *));
75	void (*pfncn) __P((char *, unsigned long, unsigned long));
76
77	if ((p = rindex(argv[0], '/')) == NULL)
78		p = argv[0];
79	else
80		++p;
81	if (!strcmp(p, "sum")) {
82		cfncn = csum1;
83		pfncn = psum1;
84	} else {
85		cfncn = crc;
86		pfncn = pcrc;
87	}
88
89	while ((ch = getopt(argc, argv, "o:")) != -1)
90		switch (ch) {
91		case 'o':
92			if (!strcmp(optarg, "1")) {
93				cfncn = csum1;
94				pfncn = psum1;
95			} else if (!strcmp(optarg, "2")) {
96				cfncn = csum2;
97				pfncn = psum2;
98			} else {
99				warnx("illegal argument to -o option");
100				usage();
101			}
102			break;
103		case '?':
104		default:
105			usage();
106		}
107	argc -= optind;
108	argv += optind;
109
110	fd = STDIN_FILENO;
111	fn = NULL;
112	rval = 0;
113	do {
114		if (*argv) {
115			fn = *argv++;
116			if ((fd = open(fn, O_RDONLY, 0)) < 0) {
117				warn("%s", fn);
118				rval = 1;
119				continue;
120			}
121		}
122		if (cfncn(fd, &val, &len)) {
123			warn("%s", fn ? fn : "stdin");
124			rval = 1;
125		} else
126			pfncn(fn, val, len);
127		(void)close(fd);
128	} while (*argv);
129	exit(rval);
130}
131
132static void
133usage()
134{
135	(void)fprintf(stderr, "usage: cksum [-o 1 | 2] [file ...]\n");
136	(void)fprintf(stderr, "       sum [file ...]\n");
137	exit(1);
138}
139