1 /* $NetBSD: regular.c,v 1.12 2003/08/07 11:13:23 agc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94"; 36 #else 37 __RCSID("$NetBSD: regular.c,v 1.12 2003/08/07 11:13:23 agc 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 = (u_char *)mmap(NULL, (size_t)length, 81 PROT_READ, MAP_FILE|MAP_SHARED, fd1, skip1)) == MAP_FAILED) 82 goto mmap_failed; 83 (void)madvise(p1, (size_t)length, MADV_SEQUENTIAL); 84 85 if ((p2 = (u_char *)mmap(NULL, (size_t)length, 86 PROT_READ, MAP_FILE|MAP_SHARED, fd2, skip2)) == MAP_FAILED) { 87 munmap(p1, (size_t) length); 88 goto mmap_failed; 89 } 90 (void)madvise(p2, (size_t)length, MADV_SEQUENTIAL); 91 92 dfound = 0; 93 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 94 if ((ch = *p1) != *p2) { 95 if (lflag) { 96 dfound = 1; 97 (void)printf("%6lld %3o %3o\n", (long long)byte, 98 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