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Annotation of 43BSDReno/usr.bin/locate/bigram/locate.bigram.c, revision 1.1.1.1

1.1       root        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 are permitted
                      9:  * provided that: (1) source distributions retain this entire copyright
                     10:  * notice and comment, and (2) distributions including binaries display
                     11:  * the following acknowledgement:  ``This product includes software
                     12:  * developed by the University of California, Berkeley and its contributors''
                     13:  * in the documentation or other materials provided with the distribution
                     14:  * and in all advertising materials mentioning features or use of this
                     15:  * software. Neither the name of the University nor the names of its
                     16:  * contributors may be used to endorse or promote products derived
                     17:  * from this software without specific prior written permission.
                     18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     21:  */
                     22: 
                     23: #ifndef lint
                     24: char copyright[] =
                     25: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
                     26:  All rights reserved.\n";
                     27: #endif /* not lint */
                     28: 
                     29: #ifndef lint
                     30: static char sccsid[] = "@(#)locate.bigram.c    4.7 (Berkeley) 6/1/90";
                     31: #endif /* not lint */
                     32: 
                     33: /*
                     34:  *  bigram < text > bigrams
                     35:  * 
                     36:  * List bigrams for 'updatedb' script.
                     37:  * Use 'code' to encode a file using this output.
                     38:  */
                     39: 
                     40: #include <stdio.h>
                     41: #include <sys/param.h>                 /* for MAXPATHLEN */
                     42: 
                     43: char buf1[MAXPATHLEN] = " ";   
                     44: char buf2[MAXPATHLEN];
                     45: 
                     46: main ( )
                     47: {
                     48:        register char *cp;
                     49:        register char *oldpath = buf1, *path = buf2;
                     50: 
                     51:        while ( fgets ( path, sizeof(buf2), stdin ) != NULL ) {
                     52: 
                     53:                /* skip longest common prefix */
                     54:                for ( cp = path; *cp == *oldpath; cp++, oldpath++ )
                     55:                        if ( *oldpath == NULL )
                     56:                                break;
                     57:                /*
                     58:                 * output post-residue bigrams only
                     59:                 */
                     60:                while ( *cp != NULL && *(cp + 1) != NULL ) {
                     61:                        putchar ( *cp++ );
                     62:                        putchar ( *cp++ );
                     63:                        putchar ( '\n' );
                     64:                }
                     65:                if ( path == buf1 )             /* swap pointers */
                     66:                        path = buf2, oldpath = buf1;
                     67:                else
                     68:                        path = buf1, oldpath = buf2;
                     69:        }
                     70: }

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