1 /* $NetBSD: special.c,v 1.14 2011/11/28 10:10:10 wiz 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 1.14 2011/11/28 10:10:10 wiz 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
49 void
c_special(int fd1,const char * file1,off_t skip1,int fd2,const char * file2,off_t skip2)50 c_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