Annotation of src/usr.bin/cmp/regular.c, Revision 1.6
1.6 ! deraadt 1: /* $OpenBSD: regular.c,v 1.5 2000/10/12 13:33:47 deraadt 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.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: #if 0
39: static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94";
40: #else
1.6 ! deraadt 41: static char rcsid[] = "$OpenBSD: regular.c,v 1.5 2000/10/12 13:33:47 deraadt Exp $";
1.1 deraadt 42: #endif
43: #endif /* not lint */
44:
45: #include <sys/param.h>
46: #include <sys/mman.h>
47: #include <sys/stat.h>
48:
49: #include <err.h>
50: #include <limits.h>
51: #include <stdlib.h>
52: #include <stdio.h>
53: #include <string.h>
54:
55: #include "extern.h"
56:
57: void
58: c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
59: int fd1, fd2;
60: char *file1, *file2;
61: off_t skip1, len1, skip2, len2;
62: {
63: u_char ch, *p1, *p2;
64: off_t byte, length, line;
65: int dfound;
66:
67: if (sflag && len1 != len2)
68: exit(1);
69:
70: if (skip1 > len1)
71: eofmsg(file1);
72: len1 -= skip1;
73: if (skip2 > len2)
74: eofmsg(file2);
75: len2 -= skip2;
76:
77: length = MIN(len1, len2);
1.4 kevlo 78: if (length > SIZE_T_MAX) {
79: mmap_failed:
80: c_special(fd1, file1, skip1, fd2, file2, skip2);
81: return;
82: }
1.1 deraadt 83:
1.3 mickey 84: if ((p1 = mmap(NULL, (size_t)length, PROT_READ,
1.5 deraadt 85: MAP_PRIVATE, fd1, skip1)) == MAP_FAILED)
86: goto mmap_failed;
1.3 mickey 87: if ((p2 = mmap(NULL, (size_t)length, PROT_READ,
1.5 deraadt 88: MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) {
1.4 kevlo 89: munmap(p1, (size_t)length);
90: goto mmap_failed;
91: }
1.1 deraadt 92:
93: dfound = 0;
94: for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
1.3 mickey 95: if ((ch = *p1) != *p2) {
1.1 deraadt 96: if (lflag) {
97: dfound = 1;
1.6 ! deraadt 98: (void)printf("%6lld %3o %3o\n", (long long)byte,
! 99: ch, *p2);
1.1 deraadt 100: } else
101: diffmsg(file1, file2, byte, line);
102: /* NOTREACHED */
1.3 mickey 103: }
1.1 deraadt 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: }