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/*
* $OpenBSD: locate.bigram.c,v 1.13 2015/01/16 06:40:09 deraadt Exp $
*
* Copyright (c) 1995 Wolfram Schneider <wosch@FreeBSD.org>. Berlin.
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* James A. Woods.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: locate.bigram.c,v 1.13 2015/01/16 06:40:09 deraadt Exp $
*/
/*
* bigram < sorted_file_names | sort -nr |
* awk 'NR <= 128 { printf $2 }' > bigrams
*
* List bigrams for 'updatedb' script.
* Use 'code' to encode a file using this output.
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include "locate.h"
u_char buf1[PATH_MAX] = " ";
u_char buf2[PATH_MAX];
u_int bigram[UCHAR_MAX + 1][UCHAR_MAX + 1];
int
main(void)
{
u_char *cp;
u_char *oldpath = buf1, *path = buf2;
u_int i, j;
while (fgets(path, sizeof(buf2), stdin) != NULL) {
/*
* We don't need remove newline character '\n'.
* '\n' is less than ASCII_MIN and will be later
* ignored at output.
*/
/* skip longest common prefix */
for (cp = path; *cp == *oldpath; cp++, oldpath++)
if (*cp == '\0')
break;
while (*cp != '\0' && *(cp + 1) != '\0') {
bigram[(u_char)*cp][(u_char)*(cp + 1)]++;
cp += 2;
}
/* swap pointers */
if (path == buf1) {
path = buf2;
oldpath = buf1;
} else {
path = buf1;
oldpath = buf2;
}
}
/* output, boundary check */
for (i = ASCII_MIN; i <= ASCII_MAX; i++)
for (j = ASCII_MIN; j <= ASCII_MAX; j++)
if (bigram[i][j] != 0)
(void)printf("%4u\t%c%c\n", bigram[i][j], i, j);
exit(0);
}
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