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