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