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
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9 * notice, this list of conditions and the following disclaimer.
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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
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17 * 4. Neither the name of the University nor the names of its contributors
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33 * $FreeBSD: src/usr.bin/cmp/regular.c,v 1.7.2.3 2001/11/21 10:47:54 dwmalone Exp $
38 static const char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94";
41 #include <sys/param.h>
54 static u_char *remmap __P((u_char *, int, off_t));
55 #define MMAP_CHUNK (8*1024*1024)
57 #define ROUNDPAGE(i) ((i) & ~pagemask)
60 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
62 const char *file1, *file2;
63 off_t skip1, len1, skip2, len2;
65 u_char ch, *p1, *p2, *m1, *m2, *e1, *e2;
66 off_t byte, length, line;
68 off_t pagemask, off1, off2;
78 if (sflag && len1 != len2)
81 pagesize = getpagesize();
82 pagemask = (off_t)pagesize - 1;
83 off1 = ROUNDPAGE(skip1);
84 off2 = ROUNDPAGE(skip2);
86 length = MIN(len1, len2);
88 if ((m1 = remmap(NULL, fd1, off1)) == NULL) {
89 c_special(fd1, file1, skip1, fd2, file2, skip2);
93 if ((m2 = remmap(NULL, fd2, off2)) == NULL) {
94 munmap(m1, MMAP_CHUNK);
95 c_special(fd1, file1, skip1, fd2, file2, skip2);
100 e1 = m1 + MMAP_CHUNK;
101 e2 = m2 + MMAP_CHUNK;
102 p1 = m1 + (skip1 - off1);
103 p2 = m2 + (skip2 - off2);
105 for (byte = line = 1; length--; ++byte) {
106 if ((ch = *p1) != *p2) {
109 (void)printf("%08qx %02x %02x\n", byte - 1, ch, *p2);
112 (void)printf("%6qd %3o %3o\n", byte, ch, *p2);
114 diffmsg(file1, file2, byte, line);
121 if ((p1 = m1 = remmap(m1, fd1, off1)) == NULL) {
122 munmap(m2, MMAP_CHUNK);
123 err(ERR_EXIT, "remmap %s", file1);
125 e1 = m1 + MMAP_CHUNK;
129 if ((p2 = m2 = remmap(m2, fd2, off2)) == NULL) {
130 munmap(m1, MMAP_CHUNK);
131 err(ERR_EXIT, "remmap %s", file2);
133 e2 = m2 + MMAP_CHUNK;
136 munmap(m1, MMAP_CHUNK);
137 munmap(m2, MMAP_CHUNK);
140 eofmsg (len1 > len2 ? file2 : file1);
146 remmap(mem, fd, offset)
152 munmap(mem, MMAP_CHUNK);
153 mem = mmap(NULL, MMAP_CHUNK, PROT_READ, MAP_SHARED, fd, offset);
154 if (mem == MAP_FAILED)
156 madvise(mem, MMAP_CHUNK, MADV_SEQUENTIAL);