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DEFINITIONS
This source file includes following definitions.
- main
1 /*
2 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
3 * The President and Fellows of Harvard College.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY 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 UNIVERSITY 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
27 * SUCH DAMAGE.
28 */
29
30 /*
31 * hash: Takes a file and computes a "hash" value by adding together all
32 * the values in the file mod some largish prime.
33 *
34 * Once the basic system calls are complete, this should work on any
35 * file the system supports. However, it's probably of most use for
36 * testing your file system code.
37 *
38 * This should really be replaced with a real hash, like MD5 or SHA-1.
39 */
40
41 #include <stdio.h>
42 #include <unistd.h>
43 #include <fcntl.h>
44 #include <err.h>
45
46 #ifdef HOST
47 #include "hostcompat.h"
48 #endif
49
50 #define HASHP 104729
51
52 int
53 main(int argc, char *argv[])
54 {
55 int fd;
56 char readbuf[1];
57 int j = 0;
58
59 #ifdef HOST
60 hostcompat_init(argc, argv);
61 #endif
62
63 if (argc != 2) {
64 errx(1, "Usage: hash filename");
65 }
66
67 fd = open(argv[1], O_RDONLY, 0664);
68
69 if (fd<0) {
70 err(1, "%s", argv[1]);
71 }
72
73 for (;;) {
74 if (read(fd, readbuf, 1) <= 0) break;
75 j = ((j*8) + (int) readbuf[0]) % HASHP;
76 }
77
78 close(fd);
79
80 printf("Hash : %d\n", j);
81
82 return 0;
83 }