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locate.bigram.c revision 1.6 
      1 /*	$NetBSD: locate.bigram.c,v 1.6 1997/10/19 04:11:52 lukem 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 #include <sys/cdefs.h>
     40 #ifndef lint
     41 __COPYRIGHT("@(#) 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	8.2 (Berkeley) 4/28/95";
     48 #endif
     49 __RCSID("$NetBSD: locate.bigram.c,v 1.6 1997/10/19 04:11:52 lukem 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 int	main __P((int, char **));
     66 
     67 int
     68 main(argc, argv)
     69 	int argc;
     70 	char *argv[];
     71 {
     72   	char *cp;
     73 	char *oldpath = buf1, *path = buf2;
     74 
     75      	while ( fgets ( path, sizeof(buf2), stdin ) != NULL ) {
     76 
     77 		/* skip longest common prefix */
     78 		for ( cp = path; *cp == *oldpath; cp++, oldpath++ )
     79 			if ( *oldpath == '\0' )
     80 				break;
     81 		/*
     82 		 * output post-residue bigrams only
     83 		 */
     84 		while ( *cp != '\0' && *(cp + 1) != '\0' ) {
     85 			putchar ( *cp++ );
     86 			putchar ( *cp++ );
     87 			putchar ( '\n' );
     88 		}
     89 		if ( path == buf1 )		/* swap pointers */
     90 			path = buf2, oldpath = buf1;
     91 		else
     92 			path = buf1, oldpath = buf2;
     93    	}
     94 	return (0);
     95 }
     96