114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* James A. Woods.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: locate.bigram.c,v 1.5 1996/08/30 03:06:15 peter Exp $
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)locate.bigram.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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/*
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* bigram < sorted_file_names | sort -nr |
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* awk 'NR <= 128 { printf $2 }' > bigrams
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*
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* List bigrams for 'updatedb' script.
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* Use 'code' to encode a file using this output.
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*/
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#include <stdio.h>
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#include <sys/param.h> /* for MAXPATHLEN */
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#include "locate.h"
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u_char buf1[MAXPATHLEN] = " ";
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u_char buf2[MAXPATHLEN];
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u_int bigram[UCHAR_MAX][UCHAR_MAX];
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int
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main(void)
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{
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register u_char *cp;
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register u_char *oldpath = buf1, *path = buf2;
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register u_int i, j;
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while (fgets(path, sizeof(buf2), stdin) != NULL) {
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/* skip empty lines */
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if (*path == '\n')
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continue;
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/* Squelch characters that would botch the decoding. */
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for (cp = path; *cp != '\0'; cp++) {
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/* chop newline */
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if (*cp == '\n')
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*cp = '\0';
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/* range */
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else if (*cp < ASCII_MIN || *cp > ASCII_MAX)
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*cp = '?';
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}
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/* skip longest common prefix */
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for (cp = path; *cp == *oldpath && *cp != '\0'; cp++, oldpath++);
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while (*cp != '\0' && *(cp+1) != '\0') {
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bigram[*cp][*(cp+1)]++;
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cp += 2;
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}
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/* swap pointers */
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if (path == buf1) {
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path = buf2;
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oldpath = buf1;
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} else {
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path = buf1;
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oldpath = buf2;
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}
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}
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/* output, (paranoid) boundary check */
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for (i = ASCII_MIN; i <= ASCII_MAX; i++)
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for (j = ASCII_MIN; j <= ASCII_MAX; j++)
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if (bigram[i][j] != 0)
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printf("%4u %c%c\n", bigram[i][j], i, j);
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exit(0);
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}
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