bin/cmp/special.c

   1 /*      $OpenBSD: special.c,v 1.8 2018/03/05 16:53:39 cheloha Exp $      */
   2 /*      $NetBSD: special.c,v 1.2 1995/09/08 03:23:00 tls Exp $      */
   3
   4 /*-
   5  * Copyright (c) 1991, 1993, 1994
   6  *      The Regents of the University of California.  All rights reserved.
   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
  33 #include <sys/types.h>
  34
  35 #include <err.h>
  36 #include <stdlib.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39
  40 #include "extern.h"
  41
  42 void
  43 c_special(int fd1, char *file1, off_t skip1, int fd2, char *file2, off_t skip2)
  44 {
  45         int ch1, ch2;
  46         off_t byte, line;
  47         FILE *fp1, *fp2;
  48         int dfound;
  49
  50         if ((fp1 = fdopen(fd1, "r")) == NULL)
  51                 fatal("%s", file1);
  52         if ((fp2 = fdopen(fd2, "r")) == NULL)
  53                 fatal("%s", file2);
  54
  55         dfound = 0;
  56         while (skip1--)
  57                 if (getc(fp1) == EOF)
  58                         goto eof;
  59         while (skip2--)
  60                 if (getc(fp2) == EOF)
  61                         goto eof;
  62
  63         for (byte = line = 1;; ++byte) {
  64                 ch1 = getc(fp1);
  65                 ch2 = getc(fp2);
  66                 if (ch1 == EOF || ch2 == EOF)
  67                         break;
  68                 if (ch1 != ch2) {
  69                         if (lflag) {
  70                                 dfound = 1;
  71                                 (void)printf("%6lld %3o %3o\n", (long long)byte,
  72                                     ch1, ch2);
  73                         } else
  74                                 diffmsg(file1, file2, byte, line);
  75                                 /* NOTREACHED */
  76                 }
  77                 if (ch1 == '\n')
  78                         ++line;
  79         }
  80
  81 eof:    if (ferror(fp1))
  82                 fatal("%s", file1);
  83         if (ferror(fp2))
  84                 fatal("%s", file2);
  85         if (feof(fp1)) {
  86                 if (!feof(fp2))
  87                         eofmsg(file1);
  88         } else
  89                 if (feof(fp2))
  90                         eofmsg(file2);
  91         if (dfound)
  92                 exit(DIFF_EXIT);
  93 }