1/*	$NetBSD: special.c,v 1.13 2009/04/11 12:16:12 lukem 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
35static char sccsid[] = "@(#)special.c	8.3 (Berkeley) 4/2/94";
36#else
37__RCSID("$NetBSD: special.c,v 1.13 2009/04/11 12:16:12 lukem 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
47#include "extern.h"
48
49void
50c_special(int fd1, const char *file1, off_t skip1, int fd2, const char *file2, off_t skip2)
51{
52	int ch1, ch2;
53	off_t byte, line;
54	FILE *fp1, *fp2;
55	int dfound;
56
57	dfound = 0;
58	if ((fp1 = fdopen(fd1, "r")) == NULL)
59		err(ERR_EXIT, "%s", file1);
60	if ((fp2 = fdopen(fd2, "r")) == NULL)
61		err(ERR_EXIT, "%s", file2);
62
63	for (byte = line = 1; skip1--; byte++) {
64		ch1 = getc(fp1);
65		if (ch1 == EOF)
66			goto eof;
67		if (ch1 == '\n')
68			line++;
69	}
70	for (byte = line = 1; skip2--; byte++) {
71		ch2 = getc(fp2);
72		if (ch2 == EOF)
73			goto eof;
74		if (ch2 == '\n')
75			line++;
76	}
77	dfound = 0;
78	for (byte = line = 1;; ++byte) {
79		ch1 = getc(fp1);
80		ch2 = getc(fp2);
81		if (ch1 == EOF || ch2 == EOF)
82			break;
83		if (ch1 != ch2) {
84			if (lflag) {
85				dfound = 1;
86				(void)printf("%6lld %3o %3o\n", (long long)byte,
87				    ch1, ch2);
88			} else
89				diffmsg(file1, file2, byte, line);
90				/* NOTREACHED */
91		}
92		if (ch1 == '\n')
93			++line;
94	}
95
96 eof:
97	if (ferror(fp1))
98		errmsg(file1, byte, line);
99	if (ferror(fp2))
100		errmsg(file2, byte, line);
101	if (feof(fp1)) {
102		if (!feof(fp2))
103			eofmsg(file1, byte, line);
104	} else
105		if (feof(fp2))
106			eofmsg(file2, byte, line);
107	(void)fclose(fp1);
108	(void)fclose(fp2);
109	if (dfound)
110		exit(DIFF_EXIT);
111}
112