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Annotation of 43BSDReno/pgrm/yacc/warshall.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:  * Robert Paul Corbett.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: static char sccsid[] = "@(#)warshall.c 5.3 (Berkeley) 6/1/90";
        !            25: #endif /* not lint */
        !            26: 
        !            27: #include "defs.h"
        !            28: 
        !            29: transitive_closure(R, n)
        !            30: unsigned *R;
        !            31: int n;
        !            32: {
        !            33:     register int rowsize;
        !            34:     register unsigned mask;
        !            35:     register unsigned *rowj;
        !            36:     register unsigned *rp;
        !            37:     register unsigned *rend;
        !            38:     register unsigned *ccol;
        !            39:     register unsigned *relend;
        !            40:     register unsigned *cword;
        !            41:     register unsigned *rowi;
        !            42: 
        !            43:     rowsize = WORDSIZE(n);
        !            44:     relend = R + n*rowsize;
        !            45: 
        !            46:     cword = R;
        !            47:     mask = 1;
        !            48:     rowi = R;
        !            49:     while (rowi < relend)
        !            50:     {
        !            51:        ccol = cword;
        !            52:        rowj = R;
        !            53: 
        !            54:        while (rowj < relend)
        !            55:        {
        !            56:            if (*ccol & mask)
        !            57:            {
        !            58:                rp = rowi;
        !            59:                rend = rowj + rowsize;
        !            60:                while (rowj < rend)
        !            61:                    *rowj++ |= *rp++;
        !            62:            }
        !            63:            else
        !            64:            {
        !            65:                rowj += rowsize;
        !            66:            }
        !            67: 
        !            68:            ccol += rowsize;
        !            69:        }
        !            70: 
        !            71:        mask <<= 1;
        !            72:        if (mask == 0)
        !            73:        {
        !            74:            mask = 1;
        !            75:            cword++;
        !            76:        }
        !            77: 
        !            78:        rowi += rowsize;
        !            79:     }
        !            80: }
        !            81: 
        !            82: reflexive_transitive_closure(R, n)
        !            83: unsigned *R;
        !            84: int n;
        !            85: {
        !            86:     register int rowsize;
        !            87:     register unsigned mask;
        !            88:     register unsigned *rp;
        !            89:     register unsigned *relend;
        !            90: 
        !            91:     transitive_closure(R, n);
        !            92: 
        !            93:     rowsize = WORDSIZE(n);
        !            94:     relend = R + n*rowsize;
        !            95: 
        !            96:     mask = 1;
        !            97:     rp = R;
        !            98:     while (rp < relend)
        !            99:     {
        !           100:        *rp |= mask;
        !           101:        mask <<= 1;
        !           102:        if (mask == 0)
        !           103:        {
        !           104:            mask = 1;
        !           105:            rp++;
        !           106:        }
        !           107: 
        !           108:        rp += rowsize;
        !           109:     }
        !           110: }

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