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 * $FreeBSD: head/usr.bin/cmp/link.c 149388 2005-08-23 13:13:13Z brian $ 27 */ 28 29 #include <sys/types.h> 30 #include <err.h> 31 #include <limits.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <unistd.h> 35 36 #include "extern.h" 37 38 void 39 c_link(const char *file1, off_t skip1, const char *file2, off_t skip2) 40 { 41 char buf1[PATH_MAX], *p1; 42 char buf2[PATH_MAX], *p2; 43 int dfound, len1, len2; 44 off_t byte; 45 u_char ch; 46 47 if ((len1 = readlink(file1, buf1, sizeof(buf1) - 1)) < 0) { 48 if (!sflag) 49 err(ERR_EXIT, "%s", file1); 50 else 51 exit(ERR_EXIT); 52 } 53 54 if ((len2 = readlink(file2, buf2, sizeof(buf2) - 1)) < 0) { 55 if (!sflag) 56 err(ERR_EXIT, "%s", file2); 57 else 58 exit(ERR_EXIT); 59 } 60 61 if (skip1 > len1) 62 skip1 = len1; 63 buf1[len1] = '\0'; 64 65 if (skip2 > len2) 66 skip2 = len2; 67 buf2[len2] = '\0'; 68 69 dfound = 0; 70 byte = 1; 71 for (p1 = buf1 + skip1, p2 = buf2 + skip2; *p1 && *p2; p1++, p2++) { 72 if ((ch = *p1) != *p2) { 73 if (xflag) { 74 dfound = 1; 75 (void)printf("%08llx %02x %02x\n", 76 (long long)byte - 1, ch, *p2); 77 } else if (lflag) { 78 dfound = 1; 79 (void)printf("%6lld %3o %3o\n", 80 (long long)byte, ch, *p2); 81 } else 82 diffmsg(file1, file2, byte, 1); 83 /* NOTREACHED */ 84 } 85 byte++; 86 } 87 88 if (*p1 || *p2) 89 eofmsg (*p1 ? file2 : file1); 90 if (dfound) 91 exit(DIFF_EXIT); 92 } 93