usr.bin/cmp/special.c

   1 /*      $NetBSD: special.c,v 1.12 2007/08/21 14:09:54 christos Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1991, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)special.c   8.3 (Berkeley) 4/2/94";
  36 #else
  37 __RCSID("$NetBSD: special.c,v 1.12 2007/08/21 14:09:54 christos Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/types.h>
  42
  43 #include <err.h>
  44 #include <stdlib.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47
  48 #include "extern.h"
  49
  50 void
  51 c_special(int fd1, const char *file1, off_t skip1, int fd2, const char *file2, off_t skip2)
  52 {
  53         int ch1, ch2;
  54         off_t byte, line;
  55         FILE *fp1, *fp2;
  56         int dfound;
  57
  58         dfound = 0;
  59         if ((fp1 = fdopen(fd1, "r")) == NULL)
  60                 err(ERR_EXIT, "%s", file1);
  61         if ((fp2 = fdopen(fd2, "r")) == NULL)
  62                 err(ERR_EXIT, "%s", file2);
  63
  64         for (byte = line = 1; skip1--; byte++) {
  65                 ch1 = getc(fp1);
  66                 if (ch1 == EOF)
  67                         goto eof;
  68                 if (ch1 == '\n')
  69                         line++;
  70         }
  71         for (byte = line = 1; skip2--; byte++) {
  72                 ch2 = getc(fp2);
  73                 if (ch2 == EOF)
  74                         goto eof;
  75                 if (ch2 == '\n')
  76                         line++;
  77         }
  78         dfound = 0;
  79         for (byte = line = 1;; ++byte) {
  80                 ch1 = getc(fp1);
  81                 ch2 = getc(fp2);
  82                 if (ch1 == EOF || ch2 == EOF)
  83                         break;
  84                 if (ch1 != ch2) {
  85                         if (lflag) {
  86                                 dfound = 1;
  87                                 (void)printf("%6lld %3o %3o\n", (long long)byte,
  88                                     ch1, ch2);
  89                         } else
  90                                 diffmsg(file1, file2, byte, line);
  91                                 /* NOTREACHED */
  92                 }
  93                 if (ch1 == '\n')
  94                         ++line;
  95         }
  96
  97  eof:
  98         if (ferror(fp1))
  99                 errmsg(file1, byte, line);
 100         if (ferror(fp2))
 101                 errmsg(file2, byte, line);
 102         if (feof(fp1)) {
 103                 if (!feof(fp2))
 104                         eofmsg(file1, byte, line);
 105         } else
 106                 if (feof(fp2))
 107                         eofmsg(file2, byte, line);
 108         (void)fclose(fp1);
 109         (void)fclose(fp2);
 110         if (dfound)
 111                 exit(DIFF_EXIT);
 112 }