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 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