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cksum.c revision 1.1 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * James W. Williams of the University of Maryland.
      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 char copyright[] =
     39 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\
     40  All rights reserved.\n";
     41 #endif /* not lint */
     42 
     43 #ifndef lint
     44 static char sccsid[] = "@(#)cksum.c	5.3 (Berkeley) 4/4/91";
     45 #endif /* not lint */
     46 
     47 #include <sys/cdefs.h>
     48 #include <sys/types.h>
     49 #include <fcntl.h>
     50 #include <unistd.h>
     51 #include <stdio.h>
     52 #include <errno.h>
     53 #include <stdlib.h>
     54 #include <string.h>
     55 #include "extern.h"
     56 
     57 main(argc, argv)
     58 	int argc;
     59 	char **argv;
     60 {
     61 	extern int optind;
     62 	u_long len, val;
     63 	register int ch, fd, rval;
     64 	char *fn;
     65 	int (*cfncn) __P((int, unsigned long *, unsigned long *));
     66 	void (*pfncn) __P((char *, unsigned long, unsigned long));
     67 
     68 	cfncn = crc;
     69 	pfncn = pcrc;
     70 	while ((ch = getopt(argc, argv, "o:")) != EOF)
     71 		switch(ch) {
     72 		case 'o':
     73 			if (*optarg == '1') {
     74 				cfncn = csum1;
     75 				pfncn = psum1;
     76 			} else if (*optarg == '2') {
     77 				cfncn = csum2;
     78 				pfncn = psum2;
     79 			} else {
     80 				(void)fprintf(stderr,
     81 				    "cksum: illegal argument to -o option\n");
     82 				usage();
     83 			}
     84 			break;
     85 		case '?':
     86 		default:
     87 			usage();
     88 		}
     89 	argc -= optind;
     90 	argv += optind;
     91 
     92 	fd = STDIN_FILENO;
     93 	fn = "stdin";
     94 	rval = 0;
     95 	do {
     96 		if (*argv) {
     97 			fn = *argv++;
     98 			if ((fd = open(fn, O_RDONLY, 0)) < 0) {
     99 				(void)fprintf(stderr,
    100 				    "cksum: %s: %s\n", fn, strerror(errno));
    101 				rval = 1;
    102 				continue;
    103 			}
    104 		}
    105 		if (cfncn(fd, &val, &len)) {
    106 			(void)fprintf(stderr,
    107 			    "cksum: %s: %s\n", fn, strerror(errno));
    108 			rval = 1;
    109 		} else
    110 			pfncn(fn, val, len);
    111 		(void)close(fd);
    112 	} while (*argv);
    113 	exit(rval);
    114 }
    115 
    116 usage()
    117 {
    118 	(void)fprintf(stderr, "usage: cksum [-o 1 | 2] [file ...]\n");
    119 	exit(1);
    120 }
    121