locate/bigram/locate.bigram.c

   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 }