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 34 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94"; 40 #endif 41 42 #include <sys/param.h> 43 #include <sys/mman.h> 44 #include <sys/stat.h> 45 46 #include <err.h> 47 #include <limits.h> 48 #include <stdlib.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #include "extern.h" 54 55 static u_char *remmap __P((u_char *, int, off_t)); 56 #define MMAP_CHUNK (8*1024*1024) 57 58 #define ROUNDPAGE(i) ((i) & ~pagemask) 59 60 void 61 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2) 62 int fd1, fd2; 63 const char *file1, *file2; 64 off_t skip1, len1, skip2, len2; 65 { 66 u_char ch, *p1, *p2, *m1, *m2, *e1, *e2; 67 off_t byte, length, line; 68 int dfound; 69 off_t pagemask, off1, off2; 70 size_t pagesize; 71 72 if (skip1 > len1) 73 eofmsg(file1); 74 len1 -= skip1; 75 if (skip2 > len2) 76 eofmsg(file2); 77 len2 -= skip2; 78 79 if (sflag && len1 != len2) 80 exit(DIFF_EXIT); 81 82 pagesize = getpagesize(); 83 pagemask = (off_t)pagesize - 1; 84 off1 = ROUNDPAGE(skip1); 85 off2 = ROUNDPAGE(skip2); 86 87 length = MIN(len1, len2); 88 89 if ((m1 = remmap(NULL, fd1, off1)) == NULL) { 90 c_special(fd1, file1, skip1, fd2, file2, skip2); 91 return; 92 } 93 94 if ((m2 = remmap(NULL, fd2, off2)) == NULL) { 95 munmap(m1, MMAP_CHUNK); 96 c_special(fd1, file1, skip1, fd2, file2, skip2); 97 return; 98 } 99 100 dfound = 0; 101 e1 = m1 + MMAP_CHUNK; 102 e2 = m2 + MMAP_CHUNK; 103 p1 = m1 + (skip1 - off1); 104 p2 = m2 + (skip2 - off2); 105 106 for (byte = line = 1; length--; ++byte) { 107 if ((ch = *p1) != *p2) { 108 if (xflag) { 109 dfound = 1; 110 (void)printf("%08qx %02x %02x\n", byte - 1, ch, *p2); 111 } else if (lflag) { 112 dfound = 1; 113 (void)printf("%6qd %3o %3o\n", byte, ch, *p2); 114 } else 115 diffmsg(file1, file2, byte, line); 116 /* NOTREACHED */ 117 } 118 if (ch == '\n') 119 ++line; 120 if (++p1 == e1) { 121 off1 += MMAP_CHUNK; 122 if ((p1 = m1 = remmap(m1, fd1, off1)) == NULL) { 123 munmap(m2, MMAP_CHUNK); 124 err(ERR_EXIT, "remmap %s", file1); 125 } 126 e1 = m1 + MMAP_CHUNK; 127 } 128 if (++p2 == e2) { 129 off2 += MMAP_CHUNK; 130 if ((p2 = m2 = remmap(m2, fd2, off2)) == NULL) { 131 munmap(m1, MMAP_CHUNK); 132 err(ERR_EXIT, "remmap %s", file2); 133 } 134 e2 = m2 + MMAP_CHUNK; 135 } 136 } 137 munmap(m1, MMAP_CHUNK); 138 munmap(m2, MMAP_CHUNK); 139 140 if (len1 != len2) 141 eofmsg (len1 > len2 ? file2 : file1); 142 if (dfound) 143 exit(DIFF_EXIT); 144 } 145 146 static u_char * 147 remmap(mem, fd, offset) 148 u_char *mem; 149 int fd; 150 off_t offset; 151 { 152 if (mem != NULL) 153 munmap(mem, MMAP_CHUNK); 154 mem = mmap(NULL, MMAP_CHUNK, PROT_READ, MAP_SHARED, fd, offset); 155 if (mem == MAP_FAILED) 156 return (NULL); 157 madvise(mem, MMAP_CHUNK, MADV_SEQUENTIAL); 158 return (mem); 159 } 160