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cksum.c revision 1.6 
      1 /*	$NetBSD: cksum.c,v 1.6 1995/03/26 05:15:17 glass Exp $	*/
      2 
      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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #ifndef lint
     40 static 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
     46 #if 0
     47 static char sccsid[] = "@(#)cksum.c	8.1 (Berkeley) 6/6/93";
     48 #else
     49 static char rcsid[] = "$NetBSD: cksum.c,v 1.6 1995/03/26 05:15:17 glass Exp $";
     50 #endif
     51 #endif /* not lint */
     52 
     53 #include <sys/cdefs.h>
     54 #include <sys/types.h>
     55 
     56 #include <err.h>
     57 #include <errno.h>
     58 #include <fcntl.h>
     59 #include <stdio.h>
     60 #include <stdlib.h>
     61 #include <string.h>
     62 #include <unistd.h>
     63 
     64 #include "extern.h"
     65 
     66 void usage __P((void));
     67 
     68 int
     69 main(argc, argv)
     70 	int argc;
     71 	char **argv;
     72 {
     73 	u_int32_t len, val;
     74 	register int ch, fd, rval;
     75 	char *fn;
     76 	int (*cfncn) __P((int, u_int32_t *, u_int32_t *));
     77 	void (*pfncn) __P((char *, u_int32_t, u_int32_t));
     78 	extern char *__progname;
     79 
     80 	if (!strcmp(__progname, "sum")) {
     81 		cfncn = csum1;
     82 		pfncn = psum1;
     83 	} else {
     84 		cfncn = crc;
     85 		pfncn = pcrc;
     86 	}
     87 
     88 	while ((ch = getopt(argc, argv, "o:")) != -1)
     89 		switch(ch) {
     90 		case 'o':
     91 			if (!strcmp(optarg, "1")) {
     92 				cfncn = csum1;
     93 				pfncn = psum1;
     94 			} else if (!strcmp(optarg, "2")) {
     95 				cfncn = csum2;
     96 				pfncn = psum2;
     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 	fd = STDIN_FILENO;
    110 	fn = NULL;
    111 	rval = 0;
    112 	do {
    113 		if (*argv) {
    114 			fn = *argv++;
    115 			if ((fd = open(fn, O_RDONLY, 0)) < 0) {
    116 				warn("%s", fn);
    117 				rval = 1;
    118 				continue;
    119 			}
    120 		}
    121 		if (cfncn(fd, &val, &len)) {
    122 			warn("%s", fn ? fn : "stdin");
    123 			rval = 1;
    124 		} else
    125 			pfncn(fn, val, len);
    126 		(void)close(fd);
    127 	} while (*argv);
    128 	exit(rval);
    129 }
    130 
    131 void
    132 usage()
    133 {
    134 
    135 	(void)fprintf(stderr, "usage: cksum [-o 1 | 2] [file ...]\n");
    136 	exit(1);
    137 }
    138