2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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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.
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18 * may be used to endorse or promote products derived from this software
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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 $
34 * $DragonFly: src/usr.bin/cmp/regular.c,v 1.2 2003/06/17 04:29:25 dillon Exp $
36 * @(#)regular.c 8.3 (Berkeley) 4/2/94
39 #include <sys/param.h>
52 static u_char *remmap __P((u_char *, int, off_t));
53 #define MMAP_CHUNK (8*1024*1024)
55 #define ROUNDPAGE(i) ((i) & ~pagemask)
58 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
60 const char *file1, *file2;
61 off_t skip1, len1, skip2, len2;
63 u_char ch, *p1, *p2, *m1, *m2, *e1, *e2;
64 off_t byte, length, line;
66 off_t pagemask, off1, off2;
76 if (sflag && len1 != len2)
79 pagesize = getpagesize();
80 pagemask = (off_t)pagesize - 1;
81 off1 = ROUNDPAGE(skip1);
82 off2 = ROUNDPAGE(skip2);
84 length = MIN(len1, len2);
86 if ((m1 = remmap(NULL, fd1, off1)) == NULL) {
87 c_special(fd1, file1, skip1, fd2, file2, skip2);
91 if ((m2 = remmap(NULL, fd2, off2)) == NULL) {
92 munmap(m1, MMAP_CHUNK);
93 c_special(fd1, file1, skip1, fd2, file2, skip2);
100 p1 = m1 + (skip1 - off1);
101 p2 = m2 + (skip2 - off2);
103 for (byte = line = 1; length--; ++byte) {
104 if ((ch = *p1) != *p2) {
107 (void)printf("%08qx %02x %02x\n", byte - 1, ch, *p2);
110 (void)printf("%6qd %3o %3o\n", byte, ch, *p2);
112 diffmsg(file1, file2, byte, line);
119 if ((p1 = m1 = remmap(m1, fd1, off1)) == NULL) {
120 munmap(m2, MMAP_CHUNK);
121 err(ERR_EXIT, "remmap %s", file1);
123 e1 = m1 + MMAP_CHUNK;
127 if ((p2 = m2 = remmap(m2, fd2, off2)) == NULL) {
128 munmap(m1, MMAP_CHUNK);
129 err(ERR_EXIT, "remmap %s", file2);
131 e2 = m2 + MMAP_CHUNK;
134 munmap(m1, MMAP_CHUNK);
135 munmap(m2, MMAP_CHUNK);
138 eofmsg (len1 > len2 ? file2 : file1);
144 remmap(mem, fd, offset)
150 munmap(mem, MMAP_CHUNK);
151 mem = mmap(NULL, MMAP_CHUNK, PROT_READ, MAP_SHARED, fd, offset);
152 if (mem == MAP_FAILED)
154 madvise(mem, MMAP_CHUNK, MADV_SEQUENTIAL);