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
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94";
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
52 static u_char *remmap(u_char *, int, off_t);
53 static void segv_handler(int);
54 #define MMAP_CHUNK (8*1024*1024)
56 #define ROUNDPAGE(i) ((i) & ~pagemask)
59 c_regular(int fd1, const char *file1, off_t skip1, off_t len1,
60 int fd2, const char *file2, off_t skip2, off_t len2)
62 u_char ch, *p1, *p2, *m1, *m2, *e1, *e2;
63 off_t byte, length, line;
65 off_t pagemask, off1, off2;
67 struct sigaction act, oact;
76 if (sflag && len1 != len2)
79 sigemptyset(&act.sa_mask);
80 act.sa_flags = SA_NODEFER;
81 act.sa_handler = segv_handler;
82 if (sigaction(SIGSEGV, &act, &oact))
83 err(ERR_EXIT, "sigaction()");
85 pagesize = getpagesize();
86 pagemask = (off_t)pagesize - 1;
87 off1 = ROUNDPAGE(skip1);
88 off2 = ROUNDPAGE(skip2);
90 length = MIN(len1, len2);
92 if ((m1 = remmap(NULL, fd1, off1)) == NULL) {
93 c_special(fd1, file1, skip1, fd2, file2, skip2);
97 if ((m2 = remmap(NULL, fd2, off2)) == NULL) {
98 munmap(m1, MMAP_CHUNK);
99 c_special(fd1, file1, skip1, fd2, file2, skip2);
104 e1 = m1 + MMAP_CHUNK;
105 e2 = m2 + MMAP_CHUNK;
106 p1 = m1 + (skip1 - off1);
107 p2 = m2 + (skip2 - off2);
109 for (byte = line = 1; length--; ++byte) {
110 if ((ch = *p1) != *p2) {
113 (void)printf("%08llx %02x %02x\n",
114 (long long)byte - 1, ch, *p2);
117 (void)printf("%6lld %3o %3o\n",
118 (long long)byte, ch, *p2);
120 diffmsg(file1, file2, byte, line);
127 if ((p1 = m1 = remmap(m1, fd1, off1)) == NULL) {
128 munmap(m2, MMAP_CHUNK);
129 err(ERR_EXIT, "remmap %s", file1);
131 e1 = m1 + MMAP_CHUNK;
135 if ((p2 = m2 = remmap(m2, fd2, off2)) == NULL) {
136 munmap(m1, MMAP_CHUNK);
137 err(ERR_EXIT, "remmap %s", file2);
139 e2 = m2 + MMAP_CHUNK;
142 munmap(m1, MMAP_CHUNK);
143 munmap(m2, MMAP_CHUNK);
145 if (sigaction(SIGSEGV, &oact, NULL))
146 err(ERR_EXIT, "sigaction()");
149 eofmsg (len1 > len2 ? file2 : file1);
155 remmap(u_char *mem, int fd, off_t offset)
158 munmap(mem, MMAP_CHUNK);
159 mem = mmap(NULL, MMAP_CHUNK, PROT_READ, MAP_SHARED, fd, offset);
160 if (mem == MAP_FAILED)
162 madvise(mem, MMAP_CHUNK, MADV_SEQUENTIAL);
167 segv_handler(int sig __unused) {
168 static const char msg[] = "cmp: Input/output error (caught SIGSEGV)\n";
170 write(STDERR_FILENO, msg, sizeof(msg));