1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * James A. Woods. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 char copyright[] = 39 "@(#) Copyright (c) 1989 The Regents of the University of California.\n\ 40 All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 /*static char sccsid[] = "from: @(#)locate.bigram.c 4.7 (Berkeley) 6/1/90";*/ 45 static char rcsid[] = "$Id: locate.bigram.c,v 1.2 1993/08/01 18:13:55 mycroft Exp $"; 46 #endif /* not lint */ 47 48 /* 49 * bigram < text > bigrams 50 * 51 * List bigrams for 'updatedb' script. 52 * Use 'code' to encode a file using this output. 53 */ 54 55 #include <stdio.h> 56 #include <sys/param.h> /* for MAXPATHLEN */ 57 58 char buf1[MAXPATHLEN] = " "; 59 char buf2[MAXPATHLEN]; 60 61 main ( ) 62 { 63 register char *cp; 64 register char *oldpath = buf1, *path = buf2; 65 66 while ( fgets ( path, sizeof(buf2), stdin ) != NULL ) { 67 68 /* skip longest common prefix */ 69 for ( cp = path; *cp == *oldpath; cp++, oldpath++ ) 70 if ( *oldpath == NULL ) 71 break; 72 /* 73 * output post-residue bigrams only 74 */ 75 while ( *cp != NULL && *(cp + 1) != NULL ) { 76 putchar ( *cp++ ); 77 putchar ( *cp++ ); 78 putchar ( '\n' ); 79 } 80 if ( path == buf1 ) /* swap pointers */ 81 path = buf2, oldpath = buf1; 82 else 83 path = buf1, oldpath = buf2; 84 } 85 } 86