1/*
2 * Copyright (c) 1995 Wolfram Schneider <wosch@FreeBSD.org>. Berlin.
3 * Copyright (c) 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * James A. Woods.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * $FreeBSD: head/usr.bin/locate/bigram/locate.bigram.c 141563 2005-02-09 09:13:36Z stefanf $
38 */
39
40#ifndef lint
41static char copyright[] =
42"@(#) Copyright (c) 1989, 1993\n\
43 The Regents of the University of California. All rights reserved.\n";
44#endif /* not lint */
45
46#ifndef lint
47static char sccsid[] = "@(#)locate.bigram.c 8.1 (Berkeley) 6/6/93";
48#endif /* not lint */
49
50/*
51 * bigram < sorted_file_names | sort -nr |
52 * awk 'NR <= 128 { printf $2 }' > bigrams
53 *
54 * List bigrams for 'updatedb' script.
55 * Use 'code' to encode a file using this output.
56 */
57
58#include <stdio.h>
59#include <stdlib.h>
60#include <sys/param.h> /* for MAXPATHLEN */
61#include "locate.h"
62
63u_char buf1[MAXPATHLEN] = " ";
64u_char buf2[MAXPATHLEN];
65u_int bigram[UCHAR_MAX + 1][UCHAR_MAX + 1];
66
67int
68main(void)
69{
70 register u_char *cp;
71 register u_char *oldpath = buf1, *path = buf2;
72 register u_int i, j;
73
74 while (fgets(path, sizeof(buf2), stdin) != NULL) {
75
76 /*
77 * We don't need remove newline character '\n'.
78 * '\n' is less than ASCII_MIN and will be later
79 * ignored at output.
80 */
81
82
83 /* skip longest common prefix */
84 for (cp = path; *cp == *oldpath; cp++, oldpath++)
85 if (*cp == '\0')
86 break;
87
88 while (*cp != '\0' && *(cp + 1) != '\0') {
89 bigram[(u_char)*cp][(u_char)*(cp + 1)]++;
90 cp += 2;
91 }
92
93 /* swap pointers */
94 if (path == buf1) {
95 path = buf2;
96 oldpath = buf1;
97 } else {
98 path = buf1;
99 oldpath = buf2;
100 }
101 }
102
103 /* output, boundary check */
104 for (i = ASCII_MIN; i <= ASCII_MAX; i++)
105 for (j = ASCII_MIN; j <= ASCII_MAX; j++)
106 if (bigram[i][j] != 0)
107 (void)printf("%4u %c%c\n", bigram[i][j], i, j);
108
109 exit(0);
110}