Home | History | Annotate | Line # | Download | only in cmp
special.c revision 1.13
      1  1.13     lukem /*	$NetBSD: special.c,v 1.13 2009/04/11 12:16:12 lukem Exp $	*/
      2   1.2       tls 
      3   1.1       tls /*-
      4   1.1       tls  * Copyright (c) 1991, 1993, 1994
      5   1.1       tls  *	The Regents of the University of California.  All rights reserved.
      6   1.1       tls  *
      7   1.1       tls  * Redistribution and use in source and binary forms, with or without
      8   1.1       tls  * modification, are permitted provided that the following conditions
      9   1.1       tls  * are met:
     10   1.1       tls  * 1. Redistributions of source code must retain the above copyright
     11   1.1       tls  *    notice, this list of conditions and the following disclaimer.
     12   1.1       tls  * 2. Redistributions in binary form must reproduce the above copyright
     13   1.1       tls  *    notice, this list of conditions and the following disclaimer in the
     14   1.1       tls  *    documentation and/or other materials provided with the distribution.
     15   1.8       agc  * 3. Neither the name of the University nor the names of its contributors
     16   1.1       tls  *    may be used to endorse or promote products derived from this software
     17   1.1       tls  *    without specific prior written permission.
     18   1.1       tls  *
     19   1.1       tls  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20   1.1       tls  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21   1.1       tls  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22   1.1       tls  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23   1.1       tls  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24   1.1       tls  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25   1.1       tls  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26   1.1       tls  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27   1.1       tls  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28   1.1       tls  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29   1.1       tls  * SUCH DAMAGE.
     30   1.1       tls  */
     31   1.1       tls 
     32   1.4     lukem #include <sys/cdefs.h>
     33   1.1       tls #ifndef lint
     34   1.2       tls #if 0
     35   1.1       tls static char sccsid[] = "@(#)special.c	8.3 (Berkeley) 4/2/94";
     36   1.2       tls #else
     37  1.13     lukem __RCSID("$NetBSD: special.c,v 1.13 2009/04/11 12:16:12 lukem Exp $");
     38   1.2       tls #endif
     39   1.1       tls #endif /* not lint */
     40   1.1       tls 
     41   1.1       tls #include <sys/types.h>
     42   1.1       tls 
     43   1.1       tls #include <err.h>
     44   1.1       tls #include <stdlib.h>
     45   1.1       tls #include <stdio.h>
     46   1.1       tls #include <string.h>
     47   1.1       tls 
     48   1.1       tls #include "extern.h"
     49   1.1       tls 
     50   1.1       tls void
     51  1.13     lukem c_special(int fd1, const char *file1, off_t skip1, int fd2, const char *file2, off_t skip2)
     52   1.1       tls {
     53   1.1       tls 	int ch1, ch2;
     54   1.1       tls 	off_t byte, line;
     55   1.1       tls 	FILE *fp1, *fp2;
     56   1.1       tls 	int dfound;
     57   1.1       tls 
     58   1.4     lukem 	dfound = 0;
     59   1.1       tls 	if ((fp1 = fdopen(fd1, "r")) == NULL)
     60   1.1       tls 		err(ERR_EXIT, "%s", file1);
     61   1.1       tls 	if ((fp2 = fdopen(fd2, "r")) == NULL)
     62   1.1       tls 		err(ERR_EXIT, "%s", file2);
     63   1.1       tls 
     64  1.11  christos 	for (byte = line = 1; skip1--; byte++) {
     65  1.11  christos 		ch1 = getc(fp1);
     66  1.11  christos 		if (ch1 == EOF)
     67   1.1       tls 			goto eof;
     68  1.11  christos 		if (ch1 == '\n')
     69  1.11  christos 			line++;
     70  1.11  christos 	}
     71  1.11  christos 	for (byte = line = 1; skip2--; byte++) {
     72  1.11  christos 		ch2 = getc(fp2);
     73  1.11  christos 		if (ch2 == EOF)
     74   1.1       tls 			goto eof;
     75  1.11  christos 		if (ch2 == '\n')
     76  1.11  christos 			line++;
     77  1.11  christos 	}
     78   1.1       tls 	dfound = 0;
     79   1.1       tls 	for (byte = line = 1;; ++byte) {
     80   1.1       tls 		ch1 = getc(fp1);
     81   1.1       tls 		ch2 = getc(fp2);
     82   1.1       tls 		if (ch1 == EOF || ch2 == EOF)
     83   1.1       tls 			break;
     84   1.6      ross 		if (ch1 != ch2) {
     85   1.1       tls 			if (lflag) {
     86   1.1       tls 				dfound = 1;
     87   1.7     lukem 				(void)printf("%6lld %3o %3o\n", (long long)byte,
     88   1.5       mrg 				    ch1, ch2);
     89   1.1       tls 			} else
     90   1.1       tls 				diffmsg(file1, file2, byte, line);
     91   1.1       tls 				/* NOTREACHED */
     92   1.6      ross 		}
     93   1.1       tls 		if (ch1 == '\n')
     94   1.1       tls 			++line;
     95   1.1       tls 	}
     96   1.1       tls 
     97  1.12  christos  eof:
     98  1.12  christos 	if (ferror(fp1))
     99  1.12  christos 		errmsg(file1, byte, line);
    100   1.1       tls 	if (ferror(fp2))
    101  1.12  christos 		errmsg(file2, byte, line);
    102   1.1       tls 	if (feof(fp1)) {
    103   1.1       tls 		if (!feof(fp2))
    104  1.11  christos 			eofmsg(file1, byte, line);
    105   1.1       tls 	} else
    106   1.1       tls 		if (feof(fp2))
    107  1.11  christos 			eofmsg(file2, byte, line);
    108  1.10  christos 	(void)fclose(fp1);
    109  1.10  christos 	(void)fclose(fp2);
    110   1.1       tls 	if (dfound)
    111   1.1       tls 		exit(DIFF_EXIT);
    112   1.1       tls }
    113