cksum/cksum.c

   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 #include <sys/cdefs.h>
  38 #ifndef lint
  39 __used static const char copyright[] =
  40 "@(#) Copyright (c) 1991, 1993\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif /* not lint */
  43
  44 #ifndef lint
  45 #if 0
  46 static char sccsid[] = "@(#)cksum.c     8.2 (Berkeley) 4/28/95";
  47 #endif
  48 #endif /* not lint */
  49
  50 #include <sys/cdefs.h>
  51 __FBSDID("$FreeBSD: src/usr.bin/cksum/cksum.c,v 1.17 2003/03/13 23:32:28 robert Exp $");
  52
  53 #include <sys/types.h>
  54
  55 #include <err.h>
  56 #include <fcntl.h>
  57 #include <stdint.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62
  63 #include "extern.h"
  64
  65 static void usage(void);
  66
  67 int
  68 main(int argc, char **argv)
  69 {
  70         uint32_t val;
  71         int ch, fd, rval;
  72         off_t len;
  73         char *fn, *p;
  74         int (*cfncn)(int, uint32_t *, off_t *);
  75         void (*pfncn)(char *, u_int32_t, off_t);
  76
  77         cfncn=NULL;
  78
  79         if(*argv) {
  80           if ((p = rindex(argv[0], '/')) == NULL)
  81             p = argv[0];
  82           else
  83             ++p;
  84           if (!strcmp(p, "sum")) {
  85             cfncn = csum1;
  86             pfncn = psum1;
  87             ++argv;
  88           }
  89         }
  90
  91         if(!cfncn) {
  92                 cfncn = crc;
  93                 pfncn = pcrc;
  94
  95                 while ((ch = getopt(argc, argv, "o:")) != -1)
  96                         switch (ch) {
  97                         case 'o':
  98                                 if (!strcmp(optarg, "1")) {
  99                                         cfncn = csum1;
 100                                         pfncn = psum1;
 101                                 } else if (!strcmp(optarg, "2")) {
 102                                         cfncn = csum2;
 103                                         pfncn = psum2;
 104                                 } else if (!strcmp(optarg, "3")) {
 105                                         cfncn = crc32;
 106                                         pfncn = pcrc;
 107                                 } else {
 108                                         warnx("illegal argument to -o option");
 109                                         usage();
 110                                 }
 111                                 break;
 112                         case '?':
 113                         default:
 114                                 usage();
 115                         }
 116 //              argc -= optind;
 117                 argv += optind;
 118         }
 119
 120         fd = STDIN_FILENO;
 121         fn = NULL;
 122         rval = 0;
 123         do {
 124                 if (*argv) {
 125                         fn = *argv++;
 126                         if ((fd = open(fn, O_RDONLY, 0)) < 0) {
 127                                 warn("%s", fn);
 128                                 rval = 1;
 129                                 continue;
 130                         }
 131                 }
 132                 if (cfncn(fd, &val, &len)) {
 133                         warn("%s", fn ? fn : "stdin");
 134                         rval = 1;
 135                 } else
 136                         pfncn(fn, val, len);
 137                 (void)close(fd);
 138         } while (*argv);
 139         exit(rval);
 140 }
 141
 142 static void
 143 usage(void)
 144 {
 145         (void)fprintf(stderr, "usage: cksum [-o 1 | 2 | 3] [file ...]\n");
 146         (void)fprintf(stderr, "       sum [file ...]\n");
 147         exit(1);
 148 }