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locate.bigram.c revision 1.3 
      1 /*	$NetBSD: locate.bigram.c,v 1.3 1994/12/22 06:17:40 jtc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * James A. Woods.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #ifndef lint
     40 static char copyright[] =
     41 "@(#) Copyright (c) 1989, 1993\n\
     42 	The Regents of the University of California.  All rights reserved.\n";
     43 #endif /* not lint */
     44 
     45 #ifndef lint
     46 #if 0
     47 static char sccsid[] = "@(#)locate.bigram.c	8.1 (Berkeley) 6/6/93";
     48 #endif
     49 static char rcsid[] = "$NetBSD: locate.bigram.c,v 1.3 1994/12/22 06:17:40 jtc Exp $";
     50 #endif /* not lint */
     51 
     52 /*
     53  *  bigram < text > bigrams
     54  *
     55  * List bigrams for 'updatedb' script.
     56  * Use 'code' to encode a file using this output.
     57  */
     58 
     59 #include <stdio.h>
     60 #include <sys/param.h>			/* for MAXPATHLEN */
     61 
     62 char buf1[MAXPATHLEN] = " ";
     63 char buf2[MAXPATHLEN];
     64 
     65 main ( )
     66 {
     67   	register char *cp;
     68 	register char *oldpath = buf1, *path = buf2;
     69 
     70      	while ( fgets ( path, sizeof(buf2), stdin ) != NULL ) {
     71 
     72 		/* skip longest common prefix */
     73 		for ( cp = path; *cp == *oldpath; cp++, oldpath++ )
     74 			if ( *oldpath == NULL )
     75 				break;
     76 		/*
     77 		 * output post-residue bigrams only
     78 		 */
     79 		while ( *cp != NULL && *(cp + 1) != NULL ) {
     80 			putchar ( *cp++ );
     81 			putchar ( *cp++ );
     82 			putchar ( '\n' );
     83 		}
     84 		if ( path == buf1 )		/* swap pointers */
     85 			path = buf2, oldpath = buf1;
     86 		else
     87 			path = buf1, oldpath = buf2;
     88    	}
     89 }
     90