2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 * $FreeBSD: src/usr.bin/cmp/regular.c,v 1.7.2.3 2001/11/21 10:47:54 dwmalone Exp $
30 * $DragonFly: src/usr.bin/cmp/regular.c,v 1.4 2003/11/03 19:31:28 eirikn Exp $
32 * @(#)regular.c 8.3 (Berkeley) 4/2/94
35 #include <sys/param.h>
49 static u_char *remmap(u_char *, int, off_t);
50 #define MMAP_CHUNK (8*1024*1024)
52 #define ROUNDPAGE(i) ((i) & ~pagemask)
55 c_regular(int fd1, const char *file1, off_t skip1, off_t len1, int fd2,
56 const char *file2, off_t skip2, off_t len2)
58 u_char ch, *p1, *p2, *m1, *m2, *e1, *e2;
59 off_t byte, length, line;
61 off_t pagemask, off1, off2;
71 if (sflag && len1 != len2)
74 pagesize = getpagesize();
75 pagemask = (off_t)pagesize - 1;
76 off1 = ROUNDPAGE(skip1);
77 off2 = ROUNDPAGE(skip2);
79 length = MIN(len1, len2);
81 if ((m1 = remmap(NULL, fd1, off1)) == NULL) {
82 c_special(fd1, file1, skip1, fd2, file2, skip2);
86 if ((m2 = remmap(NULL, fd2, off2)) == NULL) {
87 munmap(m1, MMAP_CHUNK);
88 c_special(fd1, file1, skip1, fd2, file2, skip2);
95 p1 = m1 + (skip1 - off1);
96 p2 = m2 + (skip2 - off2);
98 for (byte = line = 1; length--; ++byte) {
99 if ((ch = *p1) != *p2) {
102 printf("%08jx %02x %02x\n",
103 (intmax_t)byte - 1, ch, *p2);
106 printf("%6jd %3o %3o\n",
107 (intmax_t)byte, ch, *p2);
109 diffmsg(file1, file2, byte, line);
117 if ((p1 = m1 = remmap(m1, fd1, off1)) == NULL) {
118 munmap(m2, MMAP_CHUNK);
119 err(ERR_EXIT, "remmap %s", file1);
121 e1 = m1 + MMAP_CHUNK;
125 if ((p2 = m2 = remmap(m2, fd2, off2)) == NULL) {
126 munmap(m1, MMAP_CHUNK);
127 err(ERR_EXIT, "remmap %s", file2);
129 e2 = m2 + MMAP_CHUNK;
132 munmap(m1, MMAP_CHUNK);
133 munmap(m2, MMAP_CHUNK);
136 eofmsg (len1 > len2 ? file2 : file1);
142 remmap(u_char *mem, int fd, off_t offset)
145 munmap(mem, MMAP_CHUNK);
146 mem = mmap(NULL, MMAP_CHUNK, PROT_READ, MAP_SHARED, fd, offset);
147 if (mem == MAP_FAILED)
149 madvise(mem, MMAP_CHUNK, MADV_SEQUENTIAL);