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 209571 2010-06-28 12:04:55Z gavin $
38 */
39
40#if 0
41#ifndef lint
42static char copyright[] =
43"@(#) Copyright (c) 1989, 1993\n\
44 The Regents of the University of California. All rights reserved.\n";
45#endif /* not lint */
46
47#ifndef lint
48static char sccsid[] = "@(#)locate.bigram.c 8.1 (Berkeley) 6/6/93";
49#endif /* not lint */
50#endif
51
52/*
53 * bigram < sorted_file_names | sort -nr |
54 * awk 'NR <= 128 { printf $2 }' > bigrams
55 *
56 * List bigrams for 'updatedb' script.
57 * Use 'code' to encode a file using this output.
58 */
59
60#include <stdio.h>
61#include <stdlib.h>
62#include <sys/param.h> /* for MAXPATHLEN */
63#include "locate.h"
64
65u_char buf1[MAXPATHLEN] = " ";
66u_char buf2[MAXPATHLEN];
67u_int bigram[UCHAR_MAX + 1][UCHAR_MAX + 1];
68
69int
70main(void)
71{
72 u_char *cp;
73 u_char *oldpath = buf1, *path = buf2;
74 u_int i, j;
75
76 while (fgets(path, sizeof(buf2), stdin) != NULL) {
77
78 /*
79 * We don't need remove newline character '\n'.
80 * '\n' is less than ASCII_MIN and will be later
81 * ignored at output.
82 */
83
84
85 /* skip longest common prefix */
86 for (cp = path; *cp == *oldpath; cp++, oldpath++)
87 if (*cp == '\0')
88 break;
89
90 while (*cp != '\0' && *(cp + 1) != '\0') {
91 bigram[(u_char)*cp][(u_char)*(cp + 1)]++;
92 cp += 2;
93 }
94
95 /* swap pointers */
96 if (path == buf1) {
97 path = buf2;
98 oldpath = buf1;
99 } else {
100 path = buf1;
101 oldpath = buf2;
102 }
103 }
104
105 /* output, boundary check */
106 for (i = ASCII_MIN; i <= ASCII_MAX; i++)
107 for (j = ASCII_MIN; j <= ASCII_MAX; j++)
108 if (bigram[i][j] != 0)
109 (void)printf("%4u %c%c\n", bigram[i][j], i, j);
110
111 exit(0);
112}