1 /* $OpenBSD: regular.c,v 1.8 2003/11/21 21:41:38 mickey Exp $ */
2 /* $NetBSD: regular.c,v 1.2 1995/09/08 03:22:59 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 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94";
36 #else
37 static char rcsid[] = "$OpenBSD: regular.c,v 1.8 2003/11/21 21:41:38 mickey Exp $";
38 #endif
39 #endif /* not lint */
40
41 #include <sys/param.h>
42 #include <sys/mman.h>
43 #include <sys/stat.h>
44
45 #include <err.h>
46 #include <limits.h>
47 #include <stdlib.h>
48 #include <stdio.h>
49 #include <string.h>
50
51 #include "extern.h"
52
53 void
c_regular(fd1,file1,skip1,len1,fd2,file2,skip2,len2)54 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
55 int fd1, fd2;
56 char *file1, *file2;
57 off_t skip1, len1, skip2, len2;
58 {
59 u_char ch, *p1, *p2;
60 off_t byte, length, line;
61 int dfound;
62
63 if (sflag && len1 != len2)
64 exit(1);
65
66 if (skip1 > len1)
67 eofmsg(file1);
68 len1 -= skip1;
69 if (skip2 > len2)
70 eofmsg(file2);
71 len2 -= skip2;
72
73 length = MIN(len1, len2);
74 if (length > SIZE_T_MAX) {
75 mmap_failed:
76 c_special(fd1, file1, skip1, fd2, file2, skip2);
77 return;
78 }
79
80 if ((p1 = mmap(NULL, (size_t)length, PROT_READ,
81 MAP_PRIVATE, fd1, skip1)) == MAP_FAILED)
82 goto mmap_failed;
83 if ((p2 = mmap(NULL, (size_t)length, PROT_READ,
84 MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) {
85 munmap(p1, (size_t)length);
86 goto mmap_failed;
87 }
88 if (length) {
89 madvise(p1, length, MADV_SEQUENTIAL);
90 madvise(p2, length, MADV_SEQUENTIAL);
91 }
92
93 dfound = 0;
94 for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
95 if ((ch = *p1) != *p2) {
96 if (lflag) {
97 dfound = 1;
98 (void)printf("%6lld %3o %3o\n", (long long)byte,
99 ch, *p2);
100 } else
101 diffmsg(file1, file2, byte, line);
102 /* NOTREACHED */
103 }
104 if (ch == '\n')
105 ++line;
106 }
107
108 if (len1 != len2)
109 eofmsg (len1 > len2 ? file2 : file1);
110 if (dfound)
111 exit(DIFF_EXIT);
112 }
113