1 /* $OpenBSD: regular.c,v 1.13 2021/01/09 09:58:12 otto 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/mman.h> 34 #include <sys/stat.h> 35 36 #include <err.h> 37 #include <stdint.h> 38 #include <stdlib.h> 39 #include <stdio.h> 40 #include <string.h> 41 42 #include "extern.h" 43 44 #define MINIMUM(a, b) (((a) < (b)) ? (a) : (b)) 45 46 void 47 c_regular(int fd1, char *file1, off_t skip1, off_t len1, 48 int fd2, char *file2, off_t skip2, off_t len2) 49 { 50 u_char ch, *p1, *p2; 51 off_t byte, length, line; 52 int dfound; 53 54 if (skip1 > len1) 55 eofmsg(file1); 56 len1 -= skip1; 57 if (skip2 > len2) 58 eofmsg(file2); 59 len2 -= skip2; 60 61 if (sflag && len1 != len2) 62 exit(1); 63 64 length = MINIMUM(len1, len2); 65 if (length > SIZE_MAX) { 66 mmap_failed: 67 c_special(fd1, file1, skip1, fd2, file2, skip2); 68 return; 69 } 70 71 if ((p1 = mmap(NULL, (size_t)length, PROT_READ, 72 MAP_PRIVATE, fd1, skip1)) == MAP_FAILED) 73 goto mmap_failed; 74 if ((p2 = mmap(NULL, (size_t)length, PROT_READ, 75 MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) { 76 munmap(p1, (size_t)length); 77 goto mmap_failed; 78 } 79 if (length) { 80 madvise(p1, length, MADV_SEQUENTIAL); 81 madvise(p2, length, MADV_SEQUENTIAL); 82 } 83 84 dfound = 0; 85 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 86 if ((ch = *p1) != *p2) { 87 if (lflag) { 88 dfound = 1; 89 (void)printf("%6lld %3o %3o\n", (long long)byte, 90 ch, *p2); 91 } else 92 diffmsg(file1, file2, byte, line); 93 /* NOTREACHED */ 94 } 95 if (ch == '\n') 96 ++line; 97 } 98 99 if (len1 != len2) 100 eofmsg (len1 > len2 ? file2 : file1); 101 if (dfound) 102 exit(DIFF_EXIT); 103 } 104