1 /* $OpenBSD: regular.c,v 1.10 2011/01/19 13:01:25 okan 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 #include <sys/param.h> 34 #include <sys/mman.h> 35 #include <sys/stat.h> 36 37 #include <err.h> 38 #include <limits.h> 39 #include <stdlib.h> 40 #include <stdio.h> 41 #include <string.h> 42 43 #include "extern.h" 44 45 void 46 c_regular(int fd1, char *file1, off_t skip1, off_t len1, 47 int fd2, char *file2, off_t skip2, off_t len2) 48 { 49 u_char ch, *p1, *p2; 50 off_t byte, length, line; 51 int dfound; 52 53 if (sflag && len1 != len2) 54 exit(1); 55 56 if (skip1 > len1) 57 eofmsg(file1); 58 len1 -= skip1; 59 if (skip2 > len2) 60 eofmsg(file2); 61 len2 -= skip2; 62 63 length = MIN(len1, len2); 64 if (length > SIZE_T_MAX) { 65 mmap_failed: 66 c_special(fd1, file1, skip1, fd2, file2, skip2); 67 return; 68 } 69 70 if ((p1 = mmap(NULL, (size_t)length, PROT_READ, 71 MAP_PRIVATE, fd1, skip1)) == MAP_FAILED) 72 goto mmap_failed; 73 if ((p2 = mmap(NULL, (size_t)length, PROT_READ, 74 MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) { 75 munmap(p1, (size_t)length); 76 goto mmap_failed; 77 } 78 if (length) { 79 madvise(p1, length, MADV_SEQUENTIAL); 80 madvise(p2, length, MADV_SEQUENTIAL); 81 } 82 83 dfound = 0; 84 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 85 if ((ch = *p1) != *p2) { 86 if (lflag) { 87 dfound = 1; 88 (void)printf("%6lld %3o %3o\n", (long long)byte, 89 ch, *p2); 90 } else 91 diffmsg(file1, file2, byte, line); 92 /* NOTREACHED */ 93 } 94 if (ch == '\n') 95 ++line; 96 } 97 98 if (len1 != len2) 99 eofmsg (len1 > len2 ? file2 : file1); 100 if (dfound) 101 exit(DIFF_EXIT); 102 } 103