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/* $OpenBSD: locate.bigram.c,v 1.4 1996/08/30 12:54:16 michaels Exp $ */
/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)locate.bigram.c 8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$OpenBSD: locate.bigram.c,v 1.4 1996/08/30 12:54:16 michaels Exp $";
#endif
#endif /* not lint */
/*
* bigram < text > bigrams
*
* List bigrams for 'updatedb' script.
* Use 'code' to encode a file using this output.
*/
#include <stdio.h>
#include <sys/param.h> /* for MAXPATHLEN */
#include <string.h> /* memchr */
#include "locate.h"
u_char buf1[MAXPATHLEN] = " ";
u_char buf2[MAXPATHLEN];
unsigned int bigram[UCHAR_MAX][UCHAR_MAX];
int main(void)
{
register u_char *cp;
register u_char *oldpath = buf1, *path = buf2;
register int i, j;
while (fgets(path, sizeof(buf2), stdin) != NULL) {
/* skip empty lines */
if (*path == '\n')
continue;
/* Squelch characters that would botch the decoding. */
for (cp = path; *cp != NUL; cp++) {
/* chop newline */
if (*cp == '\n')
*cp = NUL;
/* range */
else if (*cp < ASCII_MIN || *cp > ASCII_MAX)
*cp = '?';
}
/* skip longest common prefix */
for (cp = path; *cp == *oldpath && *cp != NUL; cp++, oldpath++)
;
/*
* output post-residue bigrams only
*/
/* check later for boundary */
while ( *cp != NUL && *(cp+1) != NUL ) {
bigram[*cp][*(cp+1)]++;
cp += 2;
}
if ( path == buf1 ) { /* swap pointers */
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)
fprintf(stdout, "%4d %c%c\n",
bigram[i][j], i, j);
return 0;
}
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