1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD$ 34 * 35 */ 36 37 #ifndef lint 38 static const char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94"; 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 #include <unistd.h> 51 52 #include "extern.h" 53 54 #define ROUNDPAGE(i) ((i) & ~pagemask) 55 56 void 57 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2) 58 int fd1, fd2; 59 char *file1, *file2; 60 off_t skip1, len1, skip2, len2; 61 { 62 u_char ch, *p1, *p2; 63 off_t byte, length, line; 64 int dfound; 65 off_t pagemask, off1, off2; 66 size_t pagesize; 67 68 if (skip1 > len1) 69 eofmsg(file1); 70 len1 -= skip1; 71 if (skip2 > len2) 72 eofmsg(file2); 73 len2 -= skip2; 74 75 if (sflag && len1 != len2) 76 exit(DIFF_EXIT); 77 78 pagesize = getpagesize(); 79 pagemask = (off_t)pagesize - 1; 80 off1 = ROUNDPAGE(skip1); 81 off2 = ROUNDPAGE(skip2); 82 83 length = MIN(len1, len2); 84 if (length > SIZE_T_MAX) 85 return (c_special(fd1, file1, skip1, fd2, file2, skip2)); 86 87 if ((p1 = (u_char *)mmap(NULL, (size_t)len1 + skip1 % pagesize, 88 PROT_READ, MAP_SHARED, fd1, off1)) == (u_char *)MAP_FAILED) 89 err(ERR_EXIT, "%s", file1); 90 91 madvise(p1, len1 + skip1 % pagesize, MADV_SEQUENTIAL); 92 if ((p2 = (u_char *)mmap(NULL, (size_t)len2 + skip2 % pagesize, 93 PROT_READ, MAP_SHARED, fd2, off2)) == (u_char *)MAP_FAILED) 94 err(ERR_EXIT, "%s", file2); 95 madvise(p2, len2 + skip2 % pagesize, MADV_SEQUENTIAL); 96 97 dfound = 0; 98 p1 += skip1 - off1; 99 p2 += skip2 - off2; 100 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 101 if ((ch = *p1) != *p2) { 102 if (xflag) { 103 dfound = 1; 104 (void)printf("%08qx %02x %02x\n", byte - 1, ch, *p2); 105 } else if (lflag) { 106 dfound = 1; 107 (void)printf("%6qd %3o %3o\n", byte, ch, *p2); 108 } else 109 diffmsg(file1, file2, byte, line); 110 /* NOTREACHED */ 111 } 112 if (ch == '\n') 113 ++line; 114 } 115 116 if (len1 != len2) 117 eofmsg (len1 > len2 ? file2 : file1); 118 if (dfound) 119 exit(DIFF_EXIT); 120 } 121