usr.bin/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  * @(#)cksum.c  8.2 (Berkeley) 4/28/95
  37  * $FreeBSD: src/usr.bin/cksum/cksum.c,v 1.18 2008/05/15 20:04:36 brooks Exp $
  38  * $DragonFly: src/usr.bin/cksum/cksum.c,v 1.6 2005/04/10 20:55:38 drhodus Exp $
  39  */
  40
  41 #include <sys/types.h>
  42
  43 #include <err.h>
  44 #include <fcntl.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49
  50 #include "extern.h"
  51
  52 static void usage(void);
  53
  54 int
  55 main(int argc, char **argv)
  56 {
  57         uint32_t val;
  58         int ch, fd, rval;
  59         off_t len;
  60         char *fn, *p;
  61         int (*cfncn)(int, uint32_t *, off_t *);
  62         void (*pfncn)(char *, uint32_t, off_t);
  63
  64         if ((p = strrchr(argv[0], '/')) == NULL)
  65                 p = argv[0];
  66         else
  67                 ++p;
  68         if (!strcmp(p, "sum")) {
  69                 cfncn = csum1;
  70                 pfncn = psum1;
  71                 ++argv;
  72         } else {
  73                 cfncn = crc;
  74                 pfncn = pcrc;
  75
  76                 while ((ch = getopt(argc, argv, "o:")) != -1)
  77                         switch (ch) {
  78                         case 'o':
  79                                 if (!strcmp(optarg, "1")) {
  80                                         cfncn = csum1;
  81                                         pfncn = psum1;
  82                                 } else if (!strcmp(optarg, "2")) {
  83                                         cfncn = csum2;
  84                                         pfncn = psum2;
  85                                 } else if (!strcmp(optarg, "3")) {
  86                                         cfncn = crc32;
  87                                         pfncn = pcrc;
  88                                 } else {
  89                                         warnx("illegal argument to -o option");
  90                                         usage();
  91                                 }
  92                                 break;
  93                         case '?':
  94                         default:
  95                                 usage();
  96                         }
  97                 argc -= optind;
  98                 argv += optind;
  99         }
 100
 101         fd = STDIN_FILENO;
 102         fn = NULL;
 103         rval = 0;
 104         do {
 105                 if (*argv) {
 106                         fn = *argv++;
 107                         if ((fd = open(fn, O_RDONLY, 0)) < 0) {
 108                                 warn("%s", fn);
 109                                 rval = 1;
 110                                 continue;
 111                         }
 112                 }
 113                 if (cfncn(fd, &val, &len)) {
 114                         warn("%s", fn ? fn : "stdin");
 115                         rval = 1;
 116                 } else
 117                         pfncn(fn, val, len);
 118                 close(fd);
 119         } while (*argv);
 120         exit(rval);
 121 }
 122
 123 static void
 124 usage(void)
 125 {
 126         fprintf(stderr, "usage: cksum [-o 1 | 2 | 3] [file ...]\n");
 127         fprintf(stderr, "       sum [file ...]\n");
 128         exit(1);
 129 }