1 /*-
2 * Copyright (c) 2005 Brian Somers <brian@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/types.h>
31 #include <err.h>
32 #include <limits.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <unistd.h>
36
37 #include "extern.h"
38
39 void
c_link(const char * file1,off_t skip1,const char * file2,off_t skip2)40 c_link(const char *file1, off_t skip1, const char *file2, off_t skip2)
41 {
42 char buf1[PATH_MAX], *p1;
43 char buf2[PATH_MAX], *p2;
44 int dfound, len1, len2;
45 off_t byte;
46 u_char ch;
47
48 if ((len1 = readlink(file1, buf1, sizeof(buf1) - 1)) < 0) {
49 if (!sflag)
50 err(ERR_EXIT, "%s", file1);
51 else
52 exit(ERR_EXIT);
53 }
54
55 if ((len2 = readlink(file2, buf2, sizeof(buf2) - 1)) < 0) {
56 if (!sflag)
57 err(ERR_EXIT, "%s", file2);
58 else
59 exit(ERR_EXIT);
60 }
61
62 if (skip1 > len1)
63 skip1 = len1;
64 buf1[len1] = '\0';
65
66 if (skip2 > len2)
67 skip2 = len2;
68 buf2[len2] = '\0';
69
70 dfound = 0;
71 byte = 1;
72 for (p1 = buf1 + skip1, p2 = buf2 + skip2; *p1 && *p2; p1++, p2++) {
73 if ((ch = *p1) != *p2) {
74 if (xflag) {
75 dfound = 1;
76 (void)printf("%08llx %02x %02x\n",
77 (long long)byte - 1, ch, *p2);
78 } else if (lflag) {
79 dfound = 1;
80 (void)printf("%6lld %3o %3o\n",
81 (long long)byte, ch, *p2);
82 } else
83 diffmsg(file1, file2, byte, 1);
84 /* NOTREACHED */
85 }
86 byte++;
87 }
88
89 if (*p1 || *p2)
90 eofmsg (*p1 ? file2 : file1);
91 if (dfound)
92 exit(DIFF_EXIT);
93 }
94