1 /* $OpenBSD: regular.c,v 1.8 2003/11/21 21:41:38 mickey Exp $ */ 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94"; 36 #else 37 static char rcsid[] = "$OpenBSD: regular.c,v 1.8 2003/11/21 21:41:38 mickey Exp $"; 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/mman.h> 43 #include <sys/stat.h> 44 45 #include <err.h> 46 #include <limits.h> 47 #include <stdlib.h> 48 #include <stdio.h> 49 #include <string.h> 50 51 #include "extern.h" 52 53 void 54 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2) 55 int fd1, fd2; 56 char *file1, *file2; 57 off_t skip1, len1, skip2, len2; 58 { 59 u_char ch, *p1, *p2; 60 off_t byte, length, line; 61 int dfound; 62 63 if (sflag && len1 != len2) 64 exit(1); 65 66 if (skip1 > len1) 67 eofmsg(file1); 68 len1 -= skip1; 69 if (skip2 > len2) 70 eofmsg(file2); 71 len2 -= skip2; 72 73 length = MIN(len1, len2); 74 if (length > SIZE_T_MAX) { 75 mmap_failed: 76 c_special(fd1, file1, skip1, fd2, file2, skip2); 77 return; 78 } 79 80 if ((p1 = mmap(NULL, (size_t)length, PROT_READ, 81 MAP_PRIVATE, fd1, skip1)) == MAP_FAILED) 82 goto mmap_failed; 83 if ((p2 = mmap(NULL, (size_t)length, PROT_READ, 84 MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) { 85 munmap(p1, (size_t)length); 86 goto mmap_failed; 87 } 88 if (length) { 89 madvise(p1, length, MADV_SEQUENTIAL); 90 madvise(p2, length, MADV_SEQUENTIAL); 91 } 92 93 dfound = 0; 94 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 95 if ((ch = *p1) != *p2) { 96 if (lflag) { 97 dfound = 1; 98 (void)printf("%6lld %3o %3o\n", (long long)byte, 99 ch, *p2); 100 } else 101 diffmsg(file1, file2, byte, line); 102 /* NOTREACHED */ 103 } 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 } 113