1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2005 Brian Somers <brian@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/types.h> 30 31 #include <err.h> 32 #include <limits.h> 33 #include <stdbool.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <unistd.h> 37 38 #include "extern.h" 39 40 int 41 c_link(const char *file1, off_t skip1, const char *file2, off_t skip2, 42 off_t limit) 43 { 44 char buf1[PATH_MAX], *p1; 45 char buf2[PATH_MAX], *p2; 46 ssize_t len1, len2; 47 int dfound; 48 off_t byte; 49 u_char ch; 50 51 if ((len1 = readlink(file1, buf1, sizeof(buf1) - 1)) < 0) { 52 if (!sflag) 53 err(ERR_EXIT, "%s", file1); 54 else 55 exit(ERR_EXIT); 56 } 57 58 if ((len2 = readlink(file2, buf2, sizeof(buf2) - 1)) < 0) { 59 if (!sflag) 60 err(ERR_EXIT, "%s", file2); 61 else 62 exit(ERR_EXIT); 63 } 64 65 if (skip1 > len1) 66 skip1 = len1; 67 buf1[len1] = '\0'; 68 69 if (skip2 > len2) 70 skip2 = len2; 71 buf2[len2] = '\0'; 72 73 dfound = 0; 74 byte = 1; 75 for (p1 = buf1 + skip1, p2 = buf2 + skip2; 76 *p1 && *p2 && (limit == 0 || byte <= limit); p1++, p2++) { 77 if ((ch = *p1) != *p2) { 78 if (xflag) { 79 dfound = 1; 80 (void)printf("%08llx %02x %02x\n", 81 (long long)byte - 1, ch, *p2); 82 } else if (lflag) { 83 dfound = 1; 84 if (bflag) 85 (void)printf("%6lld %3o %c %3o %c\n", 86 (long long)byte, ch, ch, *p2, *p2); 87 else 88 (void)printf("%6lld %3o %3o\n", 89 (long long)byte, ch, *p2); 90 } else { 91 diffmsg(file1, file2, byte, 1, ch, *p2); 92 return (DIFF_EXIT); 93 } 94 } 95 byte++; 96 } 97 98 if (*p1 || *p2) { 99 eofmsg (*p1 ? file2 : file1); 100 return (DIFF_EXIT); 101 } 102 return (dfound ? DIFF_EXIT : 0); 103 } 104