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cksum.c revision 1.4 
      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
     38 static 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 /* from: static char sccsid[] = "@(#)cksum.c	8.1 (Berkeley) 6/6/93"; */
     45 static char *rcsid = "$Id: cksum.c,v 1.4 1994/12/24 16:02:45 cgd Exp $";
     46 #endif /* not lint */
     47 
     48 #include <sys/cdefs.h>
     49 #include <sys/types.h>
     50 #include <fcntl.h>
     51 #include <unistd.h>
     52 #include <stdio.h>
     53 #include <errno.h>
     54 #include <stdlib.h>
     55 #include <string.h>
     56 #include "extern.h"
     57 
     58 void usage __P((void));
     59 
     60 int
     61 main(argc, argv)
     62 	int argc;
     63 	char **argv;
     64 {
     65 	extern int optind;
     66 	u_int32_t len, val;
     67 	register int ch, fd, rval;
     68 	char *fn;
     69 	int (*cfncn) __P((int, u_int32_t *, u_int32_t *));
     70 	void (*pfncn) __P((char *, u_int32_t, u_int32_t));
     71 
     72 	cfncn = crc;
     73 	pfncn = pcrc;
     74 	while ((ch = getopt(argc, argv, "o:")) != EOF)
     75 		switch(ch) {
     76 		case 'o':
     77 			if (*optarg == '1') {
     78 				cfncn = csum1;
     79 				pfncn = psum1;
     80 			} else if (*optarg == '2') {
     81 				cfncn = csum2;
     82 				pfncn = psum2;
     83 			} else {
     84 				(void)fprintf(stderr,
     85 				    "cksum: illegal argument to -o option\n");
     86 				usage();
     87 			}
     88 			break;
     89 		case '?':
     90 		default:
     91 			usage();
     92 		}
     93 	argc -= optind;
     94 	argv += optind;
     95 
     96 	fd = STDIN_FILENO;
     97 	fn = NULL;
     98 	rval = 0;
     99 	do {
    100 		if (*argv) {
    101 			fn = *argv++;
    102 			if ((fd = open(fn, O_RDONLY, 0)) < 0) {
    103 				(void)fprintf(stderr, "cksum: %s: %s\n",
    104 				    fn, strerror(errno));
    105 				rval = 1;
    106 				continue;
    107 			}
    108 		}
    109 		if (cfncn(fd, &val, &len)) {
    110 			(void)fprintf(stderr, "cksum: %s: %s\n",
    111 			    fn ? fn : "stdin", strerror(errno));
    112 			rval = 1;
    113 		} else
    114 			pfncn(fn, val, len);
    115 		(void)close(fd);
    116 	} while (*argv);
    117 	exit(rval);
    118 }
    119 
    120 void
    121 usage()
    122 {
    123 	(void)fprintf(stderr, "usage: cksum [-o 1 | 2] [file ...]\n");
    124 	exit(1);
    125 }
    126