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cksum.c revision 1.5 
      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 1.5 1995/01/15 06:43:52 mycroft Exp $";
     46 #endif /* not lint */
     47 
     48 #include <sys/cdefs.h>
     49 #include <sys/types.h>
     50 
     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 
     59 #include "extern.h"
     60 
     61 void usage __P((void));
     62 
     63 int
     64 main(argc, argv)
     65 	int argc;
     66 	char **argv;
     67 {
     68 	u_int32_t len, val;
     69 	register int ch, fd, rval;
     70 	char *fn;
     71 	int (*cfncn) __P((int, u_int32_t *, u_int32_t *));
     72 	void (*pfncn) __P((char *, u_int32_t, u_int32_t));
     73 	extern char *__progname;
     74 
     75 	if (!strcmp(__progname, "sum")) {
     76 		cfncn = csum1;
     77 		pfncn = psum1;
     78 	} else {
     79 		cfncn = crc;
     80 		pfncn = pcrc;
     81 	}
     82 
     83 	while ((ch = getopt(argc, argv, "o:")) != -1)
     84 		switch(ch) {
     85 		case 'o':
     86 			if (!strcmp(optarg, "1")) {
     87 				cfncn = csum1;
     88 				pfncn = psum1;
     89 			} else if (!strcmp(optarg, "2")) {
     90 				cfncn = csum2;
     91 				pfncn = psum2;
     92 			} else {
     93 				warnx("illegal argument to -o option");
     94 				usage();
     95 			}
     96 			break;
     97 		case '?':
     98 		default:
     99 			usage();
    100 		}
    101 	argc -= optind;
    102 	argv += optind;
    103 
    104 	fd = STDIN_FILENO;
    105 	fn = NULL;
    106 	rval = 0;
    107 	do {
    108 		if (*argv) {
    109 			fn = *argv++;
    110 			if ((fd = open(fn, O_RDONLY, 0)) < 0) {
    111 				warn("%s", fn);
    112 				rval = 1;
    113 				continue;
    114 			}
    115 		}
    116 		if (cfncn(fd, &val, &len)) {
    117 			warn("%s", fn ? fn : "stdin");
    118 			rval = 1;
    119 		} else
    120 			pfncn(fn, val, len);
    121 		(void)close(fd);
    122 	} while (*argv);
    123 	exit(rval);
    124 }
    125 
    126 void
    127 usage()
    128 {
    129 
    130 	(void)fprintf(stderr, "usage: cksum [-o 1 | 2] [file ...]\n");
    131 	exit(1);
    132 }
    133