1 /* $NetBSD: regular.c,v 1.11 2001/01/04 23:05:54 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94"; 40 #else 41 __RCSID("$NetBSD: regular.c,v 1.11 2001/01/04 23:05:54 lukem 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 = (u_char *)mmap(NULL, (size_t)length, 85 PROT_READ, MAP_FILE|MAP_SHARED, fd1, skip1)) == MAP_FAILED) 86 goto mmap_failed; 87 (void)madvise(p1, (size_t)length, MADV_SEQUENTIAL); 88 89 if ((p2 = (u_char *)mmap(NULL, (size_t)length, 90 PROT_READ, MAP_FILE|MAP_SHARED, fd2, skip2)) == MAP_FAILED) { 91 munmap(p1, (size_t) length); 92 goto mmap_failed; 93 } 94 (void)madvise(p2, (size_t)length, MADV_SEQUENTIAL); 95 96 dfound = 0; 97 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 98 if ((ch = *p1) != *p2) { 99 if (lflag) { 100 dfound = 1; 101 (void)printf("%6lld %3o %3o\n", (long long)byte, 102 ch, *p2); 103 } else 104 diffmsg(file1, file2, byte, line); 105 /* NOTREACHED */ 106 } 107 if (ch == '\n') 108 ++line; 109 } 110 111 if (len1 != len2) 112 eofmsg (len1 > len2 ? file2 : file1); 113 if (dfound) 114 exit(DIFF_EXIT); 115 } 116