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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#)cksum.c  8.2 (Berkeley) 4/28/95
  33  * $FreeBSD: src/usr.bin/cksum/cksum.c,v 1.18 2008/05/15 20:04:36 brooks Exp $
  34  * $DragonFly: src/usr.bin/cksum/cksum.c,v 1.6 2005/04/10 20:55:38 drhodus Exp $
  35  */
  36
  37 #include <sys/types.h>
  38
  39 #include <err.h>
  40 #include <fcntl.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #include "extern.h"
  47
  48 static void usage(void);
  49
  50 int
  51 main(int argc, char **argv)
  52 {
  53         uint32_t val;
  54         int ch, fd, rval;
  55         off_t len;
  56         char *fn, *p;
  57         int (*cfncn)(int, uint32_t *, off_t *);
  58         void (*pfncn)(char *, uint32_t, off_t);
  59
  60         if ((p = strrchr(argv[0], '/')) == NULL)
  61                 p = argv[0];
  62         else
  63                 ++p;
  64         if (!strcmp(p, "sum")) {
  65                 cfncn = csum1;
  66                 pfncn = psum1;
  67                 ++argv;
  68         } else {
  69                 cfncn = crc;
  70                 pfncn = pcrc;
  71
  72                 while ((ch = getopt(argc, argv, "o:")) != -1)
  73                         switch (ch) {
  74                         case 'o':
  75                                 if (!strcmp(optarg, "1")) {
  76                                         cfncn = csum1;
  77                                         pfncn = psum1;
  78                                 } else if (!strcmp(optarg, "2")) {
  79                                         cfncn = csum2;
  80                                         pfncn = psum2;
  81                                 } else if (!strcmp(optarg, "3")) {
  82                                         cfncn = crc32;
  83                                         pfncn = pcrc;
  84                                 } else {
  85                                         warnx("illegal argument to -o option");
  86                                         usage();
  87                                 }
  88                                 break;
  89                         case '?':
  90                         default:
  91                                 usage();
  92                         }
  93                 argc -= optind;
  94                 argv += optind;
  95         }
  96
  97         fd = STDIN_FILENO;
  98         fn = NULL;
  99         rval = 0;
 100         do {
 101                 if (*argv) {
 102                         fn = *argv++;
 103                         if ((fd = open(fn, O_RDONLY, 0)) < 0) {
 104                                 warn("%s", fn);
 105                                 rval = 1;
 106                                 continue;
 107                         }
 108                 }
 109                 if (cfncn(fd, &val, &len)) {
 110                         warn("%s", fn ? fn : "stdin");
 111                         rval = 1;
 112                 } else
 113                         pfncn(fn, val, len);
 114                 close(fd);
 115         } while (*argv);
 116         exit(rval);
 117 }
 118
 119 static void
 120 usage(void)
 121 {
 122         fprintf(stderr, "usage: cksum [-o 1 | 2 | 3] [file ...]\n");
 123         fprintf(stderr, "       sum [file ...]\n");
 124         exit(1);
 125 }