1 /* $OpenBSD: regular.c,v 1.4 2000/10/12 10:03:20 kevlo 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94"; 40 #else 41 static char rcsid[] = "$OpenBSD: regular.c,v 1.4 2000/10/12 10:03:20 kevlo Exp $"; 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/mman.h> 47 #include <sys/stat.h> 48 49 #include <err.h> 50 #include <limits.h> 51 #include <stdlib.h> 52 #include <stdio.h> 53 #include <string.h> 54 55 #include "extern.h" 56 57 void 58 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2) 59 int fd1, fd2; 60 char *file1, *file2; 61 off_t skip1, len1, skip2, len2; 62 { 63 u_char ch, *p1, *p2; 64 off_t byte, length, line; 65 int dfound; 66 67 if (sflag && len1 != len2) 68 exit(1); 69 70 if (skip1 > len1) 71 eofmsg(file1); 72 len1 -= skip1; 73 if (skip2 > len2) 74 eofmsg(file2); 75 len2 -= skip2; 76 77 length = MIN(len1, len2); 78 if (length > SIZE_T_MAX) { 79 mmap_failed: 80 c_special(fd1, file1, skip1, fd2, file2, skip2); 81 return; 82 } 83 84 if ((p1 = mmap(NULL, (size_t)length, PROT_READ, 85 MAP_PRIVATE, fd1, skip1)) == MAP_FAILED) 86 goto mmap failed; 87 if ((p2 = mmap(NULL, (size_t)length, PROT_READ, 88 MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) { 89 munmap(p1, (size_t)length); 90 goto mmap_failed; 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("%6qd %3o %3o\n", byte, ch, *p2); 99 } else 100 diffmsg(file1, file2, byte, line); 101 /* NOTREACHED */ 102 } 103 if (ch == '\n') 104 ++line; 105 } 106 107 if (len1 != len2) 108 eofmsg (len1 > len2 ? file2 : file1); 109 if (dfound) 110 exit(DIFF_EXIT); 111 } 112