1 /* $OpenBSD: regular.c,v 1.13 2021/01/09 09:58:12 otto 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 #include <sys/mman.h>
34 #include <sys/stat.h>
35
36 #include <err.h>
37 #include <stdint.h>
38 #include <stdlib.h>
39 #include <stdio.h>
40 #include <string.h>
41
42 #include "extern.h"
43
44 #define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
45
46 void
c_regular(int fd1,char * file1,off_t skip1,off_t len1,int fd2,char * file2,off_t skip2,off_t len2)47 c_regular(int fd1, char *file1, off_t skip1, off_t len1,
48 int fd2, char *file2, off_t skip2, off_t len2)
49 {
50 u_char ch, *p1, *p2;
51 off_t byte, length, line;
52 int dfound;
53
54 if (skip1 > len1)
55 eofmsg(file1);
56 len1 -= skip1;
57 if (skip2 > len2)
58 eofmsg(file2);
59 len2 -= skip2;
60
61 if (sflag && len1 != len2)
62 exit(1);
63
64 length = MINIMUM(len1, len2);
65 if (length > SIZE_MAX) {
66 mmap_failed:
67 c_special(fd1, file1, skip1, fd2, file2, skip2);
68 return;
69 }
70
71 if ((p1 = mmap(NULL, (size_t)length, PROT_READ,
72 MAP_PRIVATE, fd1, skip1)) == MAP_FAILED)
73 goto mmap_failed;
74 if ((p2 = mmap(NULL, (size_t)length, PROT_READ,
75 MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) {
76 munmap(p1, (size_t)length);
77 goto mmap_failed;
78 }
79 if (length) {
80 madvise(p1, length, MADV_SEQUENTIAL);
81 madvise(p2, length, MADV_SEQUENTIAL);
82 }
83
84 dfound = 0;
85 for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
86 if ((ch = *p1) != *p2) {
87 if (lflag) {
88 dfound = 1;
89 (void)printf("%6lld %3o %3o\n", (long long)byte,
90 ch, *p2);
91 } else
92 diffmsg(file1, file2, byte, line);
93 /* NOTREACHED */
94 }
95 if (ch == '\n')
96 ++line;
97 }
98
99 if (len1 != len2)
100 eofmsg (len1 > len2 ? file2 : file1);
101 if (dfound)
102 exit(DIFF_EXIT);
103 }
104