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