cksum.c revision 26922 
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 *	$Id$
37 */
38
39#ifndef lint
40static char copyright[] =
41"@(#) Copyright (c) 1991, 1993\n\
42	The Regents of the University of California.  All rights reserved.\n";
43#endif /* not lint */
44
45#ifndef lint
46static char sccsid[] = "@(#)cksum.c	8.1 (Berkeley) 6/6/93";
47#endif /* not lint */
48
49#include <sys/cdefs.h>
50#include <sys/types.h>
51#include <err.h>
52#include <errno.h>
53#include <fcntl.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58#include "extern.h"
59
60static void usage __P((void));
61
62int
63main(argc, argv)
64	int argc;
65	char **argv;
66{
67	extern int optind;
68	u_long len, val;
69	register int ch, fd, rval;
70	char *fn;
71	int (*cfncn) __P((int, unsigned long *, unsigned long *));
72	void (*pfncn) __P((char *, unsigned long, unsigned long));
73
74	cfncn = crc;
75	pfncn = pcrc;
76	while ((ch = getopt(argc, argv, "o:")) != -1)
77		switch(ch) {
78		case 'o':
79			if (*optarg == '1') {
80				cfncn = csum1;
81				pfncn = psum1;
82			} else if (*optarg == '2') {
83				cfncn = csum2;
84				pfncn = psum2;
85			} else {
86				warnx("illegal argument to -o option");
87				usage();
88			}
89			break;
90		case '?':
91		default:
92			usage();
93		}
94	argc -= optind;
95	argv += optind;
96
97	fd = STDIN_FILENO;
98	fn = NULL;
99	rval = 0;
100	do {
101		if (*argv) {
102			fn = *argv++;
103			if ((fd = open(fn, O_RDONLY, 0)) < 0) {
104				warn("%s", fn);
105				rval = 1;
106				continue;
107			}
108		}
109		if (cfncn(fd, &val, &len)) {
110			warn("%s", fn ? fn : "stdin");
111			rval = 1;
112		} else
113			pfncn(fn, val, len);
114		(void)close(fd);
115	} while (*argv);
116	exit(rval);
117}
118
119static void
120usage()
121{
122	(void)fprintf(stderr, "usage: cksum [-o 1 | 2] [file ...]\n");
123	exit(1);
124}
125