xref: /freebsd/usr.bin/cksum/cksum.c (revision 7ef62cebc2f965b0f640263e179276928885e33d)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1991, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * James W. Williams of NASA Goddard Space Flight Center.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 #ifndef lint
36 static const char copyright[] =
37 "@(#) Copyright (c) 1991, 1993\n\
38 	The Regents of the University of California.  All rights reserved.\n";
39 #endif /* not lint */
40 
41 #ifndef lint
42 #if 0
43 static char sccsid[] = "@(#)cksum.c	8.2 (Berkeley) 4/28/95";
44 #endif
45 #endif /* not lint */
46 
47 #include <sys/cdefs.h>
48 __FBSDID("$FreeBSD$");
49 
50 #include <sys/types.h>
51 
52 #include <err.h>
53 #include <fcntl.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <unistd.h>
58 
59 #include "extern.h"
60 
61 static void usage(void) __dead2;
62 
63 int
64 main(int argc, char **argv)
65 {
66 	uint32_t val;
67 	int ch, fd, rval;
68 	off_t len;
69 	char *fn, *p;
70 	int (*cfncn)(int, uint32_t *, off_t *);
71 	void (*pfncn)(char *, uint32_t, off_t);
72 
73 	if ((p = strrchr(argv[0], '/')) == NULL)
74 		p = argv[0];
75 	else
76 		++p;
77 	if (!strcmp(p, "sum")) {
78 		cfncn = csum1;
79 		pfncn = psum1;
80 		++argv;
81 	} else {
82 		cfncn = crc;
83 		pfncn = pcrc;
84 
85 		while ((ch = getopt(argc, argv, "o:")) != -1)
86 			switch (ch) {
87 			case 'o':
88 				if (!strcmp(optarg, "1")) {
89 					cfncn = csum1;
90 					pfncn = psum1;
91 				} else if (!strcmp(optarg, "2")) {
92 					cfncn = csum2;
93 					pfncn = psum2;
94 				} else if (!strcmp(optarg, "3")) {
95 					cfncn = crc32;
96 					pfncn = pcrc;
97 				} else {
98 					warnx("illegal argument to -o option");
99 					usage();
100 				}
101 				break;
102 			case '?':
103 			default:
104 				usage();
105 			}
106 		argc -= optind;
107 		argv += optind;
108 	}
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 
132 static void
133 usage(void)
134 {
135 	(void)fprintf(stderr, "usage: cksum [-o 1 | 2 | 3] [file ...]\n");
136 	(void)fprintf(stderr, "       sum [file ...]\n");
137 	exit(1);
138 }
139