1 /* $OpenBSD: regular.c,v 1.12 2015/02/06 23:21:59 millert Exp $ */
2 /* $NetBSD: regular.c,v 1.2 1995/09/08 03:22:59 tls Exp $ */
5 * Copyright (c) 1991, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
44 #define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
47 c_regular(int fd1
, char *file1
, off_t skip1
, off_t len1
,
48 int fd2
, char *file2
, off_t skip2
, off_t len2
)
51 off_t byte
, length
, line
;
54 if (sflag
&& len1
!= len2
)
64 length
= MINIMUM(len1
, len2
);
65 if (length
> SIZE_MAX
) {
67 c_special(fd1
, file1
, skip1
, fd2
, file2
, skip2
);
71 if ((p1
= mmap(NULL
, (size_t)length
, PROT_READ
,
72 MAP_PRIVATE
, fd1
, skip1
)) == MAP_FAILED
)
74 if ((p2
= mmap(NULL
, (size_t)length
, PROT_READ
,
75 MAP_PRIVATE
, fd2
, skip2
)) == MAP_FAILED
) {
76 munmap(p1
, (size_t)length
);
80 madvise(p1
, length
, MADV_SEQUENTIAL
);
81 madvise(p2
, length
, MADV_SEQUENTIAL
);
85 for (byte
= line
= 1; length
--; ++p1
, ++p2
, ++byte
) {
86 if ((ch
= *p1
) != *p2
) {
89 (void)printf("%6lld %3o %3o\n", (long long)byte
,
92 diffmsg(file1
, file2
, byte
, line
);
100 eofmsg (len1
> len2
? file2
: file1
);