Annotation of src/usr.bin/cmp/regular.c, Revision 1.9
1.9 ! deraadt 1: /* $OpenBSD: regular.c,v 1.8 2003/11/21 21:41:38 mickey Exp $ */
1.1 deraadt 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.
1.7 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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/param.h>
34: #include <sys/mman.h>
35: #include <sys/stat.h>
36:
37: #include <err.h>
38: #include <limits.h>
39: #include <stdlib.h>
40: #include <stdio.h>
41: #include <string.h>
42:
43: #include "extern.h"
44:
45: void
46: c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
47: int fd1, fd2;
48: char *file1, *file2;
49: off_t skip1, len1, skip2, len2;
50: {
51: u_char ch, *p1, *p2;
52: off_t byte, length, line;
53: int dfound;
54:
55: if (sflag && len1 != len2)
56: exit(1);
57:
58: if (skip1 > len1)
59: eofmsg(file1);
60: len1 -= skip1;
61: if (skip2 > len2)
62: eofmsg(file2);
63: len2 -= skip2;
64:
65: length = MIN(len1, len2);
1.4 kevlo 66: if (length > SIZE_T_MAX) {
67: mmap_failed:
68: c_special(fd1, file1, skip1, fd2, file2, skip2);
69: return;
70: }
1.1 deraadt 71:
1.3 mickey 72: if ((p1 = mmap(NULL, (size_t)length, PROT_READ,
1.5 deraadt 73: MAP_PRIVATE, fd1, skip1)) == MAP_FAILED)
74: goto mmap_failed;
1.3 mickey 75: if ((p2 = mmap(NULL, (size_t)length, PROT_READ,
1.5 deraadt 76: MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) {
1.4 kevlo 77: munmap(p1, (size_t)length);
78: goto mmap_failed;
1.8 mickey 79: }
80: if (length) {
81: madvise(p1, length, MADV_SEQUENTIAL);
82: madvise(p2, length, MADV_SEQUENTIAL);
1.4 kevlo 83: }
1.1 deraadt 84:
85: dfound = 0;
86: for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
1.3 mickey 87: if ((ch = *p1) != *p2) {
1.1 deraadt 88: if (lflag) {
89: dfound = 1;
1.6 deraadt 90: (void)printf("%6lld %3o %3o\n", (long long)byte,
91: ch, *p2);
1.1 deraadt 92: } else
93: diffmsg(file1, file2, byte, line);
94: /* NOTREACHED */
1.3 mickey 95: }
1.1 deraadt 96: if (ch == '\n')
97: ++line;
98: }
99:
100: if (len1 != len2)
101: eofmsg (len1 > len2 ? file2 : file1);
102: if (dfound)
103: exit(DIFF_EXIT);
104: }