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Annotation of 43BSDTahoe/games/backgammon/odds.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)odds.c     5.3 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include "back.h"
        !            23: 
        !            24: odds (r1,r2,val)
        !            25: register int   r1;
        !            26: int            r2, val;
        !            27: {
        !            28:        register int    i, j;
        !            29: 
        !            30:        if (r1 == 0)  {
        !            31:                for (i = 0; i < 6; i++)  
        !            32:                        for (j = 0; j < 6; j++)
        !            33:                                table[i][j] = 0;
        !            34:                return;
        !            35:        } else  {
        !            36:                r1--;
        !            37:                if (r2-- == 0)
        !            38:                        for (i = 0; i < 6; i++)  {
        !            39:                                table[i][r1] += val;
        !            40:                                table[r1][i] += val;
        !            41:                        }
        !            42:                else  {
        !            43:                        table[r2][r1] += val;
        !            44:                        table[r1][r2] += val;
        !            45:                }
        !            46:        }
        !            47: }
        !            48: 
        !            49: count ()  {
        !            50:        register int    i;
        !            51:        register int    j;
        !            52:        register int    total;
        !            53: 
        !            54:        total = 0;
        !            55:        for (i = 0; i < 6; i++)
        !            56:                for (j = 0; j < 6; j++)
        !            57:                        total += table[i][j];
        !            58:        return (total);
        !            59: }
        !            60: 
        !            61: canhit (i,c)
        !            62: int    i, c;
        !            63: 
        !            64: {
        !            65:        register int    j, k, b;
        !            66:        int             a, d, diff, place, addon, menstuck;
        !            67: 
        !            68:        if (c == 0)
        !            69:                odds (0,0,0);
        !            70:        if (board[i] > 0)  {
        !            71:                a = -1;
        !            72:                b = 25;
        !            73:        } else  {
        !            74:                a = 1;
        !            75:                b = 0;
        !            76:        }
        !            77:        place = abs (25-b-i);
        !            78:        menstuck = abs (board[b]);
        !            79:        for (j = b; j != i; j += a)  {
        !            80:                if (board[j]*a > 0)  {
        !            81:                        diff = abs(j-i);
        !            82:                        addon = place+((board[j]*a > 2 || j == b)? 5: 0);
        !            83:                        if ((j == b && menstuck == 1) &&
        !            84:                            (j != b && menstuck == 0))
        !            85:                                for (k = 1; k < diff; k++)
        !            86:                                        if (k < 7 && diff-k < 7 &&
        !            87:                                            (board[i+a*k]*a >= 0 ||
        !            88:                                            board[i+a*(diff-k)] >= 0))
        !            89:                                                odds (k,diff-k,addon);
        !            90:                        if ((j == b || menstuck < 2) && diff < 7)
        !            91:                                odds (diff,0,addon);
        !            92:                }
        !            93:                if (j == b && menstuck > 1)
        !            94:                        break;
        !            95:        }
        !            96:        return (count());
        !            97: }

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