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 * 4. 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
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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>
48 static u_char *remmap(u_char *, int, off_t);
49 #define MMAP_CHUNK (8*1024*1024)
51 #define ROUNDPAGE(i) ((i) & ~pagemask)
54 c_regular(int fd1, const char *file1, off_t skip1, off_t len1, int fd2,
55 const char *file2, off_t skip2, off_t len2)
57 u_char ch, *p1, *p2, *m1, *m2, *e1, *e2;
58 off_t byte, length, line;
60 off_t pagemask, off1, off2;
70 if (sflag && len1 != len2)
73 pagesize = getpagesize();
74 pagemask = (off_t)pagesize - 1;
75 off1 = ROUNDPAGE(skip1);
76 off2 = ROUNDPAGE(skip2);
78 length = MIN(len1, len2);
80 if ((m1 = remmap(NULL, fd1, off1)) == NULL) {
81 c_special(fd1, file1, skip1, fd2, file2, skip2);
85 if ((m2 = remmap(NULL, fd2, off2)) == NULL) {
86 munmap(m1, MMAP_CHUNK);
87 c_special(fd1, file1, skip1, fd2, file2, skip2);
94 p1 = m1 + (skip1 - off1);
95 p2 = m2 + (skip2 - off2);
97 for (byte = line = 1; length--; ++byte) {
98 if ((ch = *p1) != *p2) {
101 printf("%08jx %02x %02x\n",
102 (intmax_t)byte - 1, ch, *p2);
105 printf("%6jd %3o %3o\n",
106 (intmax_t)byte, ch, *p2);
108 diffmsg(file1, file2, byte, line);
116 if ((p1 = m1 = remmap(m1, fd1, off1)) == NULL) {
117 munmap(m2, MMAP_CHUNK);
118 err(ERR_EXIT, "remmap %s", file1);
120 e1 = m1 + MMAP_CHUNK;
124 if ((p2 = m2 = remmap(m2, fd2, off2)) == NULL) {
125 munmap(m1, MMAP_CHUNK);
126 err(ERR_EXIT, "remmap %s", file2);
128 e2 = m2 + MMAP_CHUNK;
131 munmap(m1, MMAP_CHUNK);
132 munmap(m2, MMAP_CHUNK);
135 eofmsg (len1 > len2 ? file2 : file1);
141 remmap(u_char *mem, int fd, off_t offset)
144 munmap(mem, MMAP_CHUNK);
145 mem = mmap(NULL, MMAP_CHUNK, PROT_READ, MAP_SHARED, fd, offset);
146 if (mem == MAP_FAILED)
148 madvise(mem, MMAP_CHUNK, MADV_SEQUENTIAL);