xref: /csrg-svn/games/cribbage/score.c (revision 33707)

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 */

#ifndef lint
static char sccsid[] = "@(#)score.c	5.3 (Berkeley) 03/10/88";
#endif /* not lint */

#include	<stdio.h>
#include	"deck.h"
#include	"cribbage.h"


/*
 * the following arrays give the sum of the scores of the (50 2)*48 = 58800
 * hands obtainable for the crib given the two cards whose ranks index the
 * array.  the two arrays are for the case where the suits are equal and
 * not equal respectively
 */

long		crbescr[ 169 ]		= {
    -10000, 271827, 278883, 332319, 347769, 261129, 250653, 253203, 248259,
    243435, 256275, 237435, 231051, -10000, -10000, 412815, 295707, 349497,
    267519, 262521, 259695, 254019, 250047, 262887, 244047, 237663, -10000,
    -10000, -10000, 333987, 388629, 262017, 266787, 262971, 252729, 254475,
    267315, 248475, 242091, -10000, -10000, -10000, -10000, 422097, 302787,
    256437, 263751, 257883, 254271, 267111, 248271, 241887, -10000, -10000,
    -10000, -10000, -10000, 427677, 387837, 349173, 347985, 423861, 436701,
    417861, 411477, -10000, -10000, -10000, -10000, -10000, -10000, 336387,
    298851, 338667, 236487, 249327, 230487, 224103, -10000, -10000, -10000,
    -10000, -10000, -10000, -10000, 408483, 266691, 229803, 246195, 227355,
    220971, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
    300675, 263787, 241695, 226407, 220023, -10000, -10000, -10000, -10000,
    -10000, -10000, -10000, -10000, -10000, 295635, 273543, 219771, 216939,
    -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
    -10000, 306519, 252747, 211431, -10000, -10000, -10000, -10000, -10000,
    -10000, -10000, -10000, -10000, -10000, -10000, 304287, 262971, -10000,
    -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
    -10000, -10000, 244131, -10000, -10000, -10000, -10000, -10000, -10000,
    -10000, -10000, -10000, -10000, -10000, -10000, -10000  };

long		crbnescr[ 169 ]		= {
    325272, 260772, 267828, 321264, 336714, 250074, 239598, 242148, 237204,
    232380, 246348, 226380, 219996, -10000, 342528, 401760, 284652, 338442,
    256464, 251466, 248640, 242964, 238992, 252960, 232992, 226608, -10000,
    -10000, 362280, 322932, 377574, 250962, 255732, 251916, 241674, 243420,
    257388, 237420, 231036, -10000, -10000, -10000, 360768, 411042, 291732,
    245382, 252696, 246828, 243216, 257184, 237216, 230832, -10000, -10000,
    -10000, -10000, 528768, 416622, 376782, 338118, 336930, 412806, 426774,
    406806, 400422, -10000, -10000, -10000, -10000, -10000, 369864, 325332,
    287796, 327612, 225432, 239400, 219432, 213048, -10000, -10000, -10000,
    -10000, -10000, -10000, 359160, 397428, 255636, 218748, 236268, 216300,
    209916, -10000, -10000, -10000, -10000, -10000, -10000, -10000, 331320,
    289620, 252732, 231768, 215352, 208968, -10000, -10000, -10000, -10000,
    -10000, -10000, -10000, -10000, 325152, 284580, 263616, 208716, 205884,
    -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
    321240, 296592, 241692, 200376, -10000, -10000, -10000, -10000, -10000,
    -10000, -10000, -10000, -10000, -10000, 348600, 294360, 253044, -10000,
    -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
    -10000, 308664, 233076, -10000, -10000, -10000, -10000, -10000, -10000,
    -10000, -10000, -10000, -10000, -10000, -10000, 295896  };


static  int		ichoose2[ 5 ]		= { 0, 0, 2, 6, 12 };
static  int		pairpoints, runpoints;	/* globals from pairuns */


/*
 * scorehand:
 *	Score the given hand of n cards and the starter card.
 *	n must be <= 4
 */
scorehand(hand, starter, n, crb, do_explain)
register CARD		hand[];
CARD			starter;
int			n;
BOOLEAN			crb;		/* true if scoring crib */
BOOLEAN			do_explain;	/* true if must explain this hand */
{
	CARD			h[(CINHAND + 1)];
	register int		i, k;
	register int		score;
	register BOOLEAN	flag;
	char			buf[32];

	expl[0] = NULL;		/* initialize explanation */
	score = 0;
	flag = TRUE;
	k = hand[0].suit;
	for (i = 0; i < n; i++) {			/* check for flush */
	    flag = (flag && (hand[i].suit == k));
	    if (hand[i].rank == JACK)			/* check for his nibs */
		if (hand[i].suit == starter.suit) {
		    score++;
		    if (do_explain)
			strcat(expl, "His Nobs");
		}
	    h[i] = hand[i];
	}

	if (flag && n >= CINHAND) {
	    if (do_explain && expl[0] != NULL)
		strcat(expl, ", ");
	    if (starter.suit == k) {
		score += 5;
		if (do_explain)
		    strcat(expl, "Five-flush");
	    }
	    else if (!crb) {
		score += 4;
		if (do_explain && expl[0] != NULL)
		    strcat(expl, ", Four-flush");
		else
		    strcpy(expl, "Four-flush");
	    }
	}

	if (do_explain && expl[0] != NULL)
	    strcat(expl, ", ");
	h[n] = starter;
	sorthand(h, n + 1);			/* sort by rank */
	i = 2 * fifteens(h, n + 1);
	score += i;
	if (do_explain)
	    if (i > 0) {
		(void)sprintf(buf, "%d points in fifteens", i);
		strcat(expl, buf);
	    }
	    else
		strcat(expl, "No fifteens");
	i = pairuns(h, n + 1);
	score += i;
	if (do_explain)
	    if (i > 0) {
		(void)sprintf(buf, ", %d points in pairs, %d in runs",
			pairpoints, runpoints);
		strcat(expl, buf);
	    }
	    else
		strcat(expl, ", No pairs/runs");
	return score;
}

/*
 * fifteens:
 *	Return number of fifteens in hand of n cards
 */
fifteens(hand, n)
register CARD		hand[];
int			n;
{
	register int		*sp, *np;
	register int		i;
	register CARD		*endp;
	static int		sums[15], nsums[15];

	np = nsums;
	sp = sums;
	i = 16;
	while (--i) {
	    *np++ = 0;
	    *sp++ = 0;
	}
	for (endp = &hand[n]; hand < endp; hand++) {
	    i = hand->rank + 1;
	    if (i > 10)
		i = 10;
	    np = &nsums[i];
	    np[-1]++;			/* one way to make this */
	    sp = sums;
	    while (i < 15) {
		*np++ += *sp++;
		i++;
	    }
	    sp = sums;
	    np = nsums;
	    i = 16;
	    while (--i)
		*sp++ = *np++;
	}
	return sums[14];
}



/*
 * pairuns returns the number of points in the n card sorted hand
 * due to pairs and runs
 * this routine only works if n is strictly less than 6
 * sets the globals pairpoints and runpoints appropriately
 */

pairuns( h, n )

    CARD		h[];
    int			n;
{
	register  int		i;
	int			runlength, runmult, lastmult, curmult;
	int			mult1, mult2, pair1, pair2;
	BOOLEAN			run;

	run = TRUE;
	runlength = 1;
	mult1 = 1;
	pair1 = -1;
	mult2 = 1;
	pair2 = -1;
	curmult = runmult = 1;
	for( i = 1; i < n; i++ )  {
	    lastmult = curmult;
	    if(  h[i].rank == h[i - 1].rank  )  {
		if(  pair1 < 0  )  {
		    pair1 = h[i].rank;
		    mult1 = curmult = 2;
		}
		else  {
		    if(  h[i].rank == pair1  )  {
			curmult = ++mult1;
		    }
		    else  {
			if(  pair2 < 0  )  {
			    pair2 = h[i].rank;
			    mult2 = curmult = 2;
			}
			else  {
			    curmult = ++mult2;
			}
		    }
		}
		if(  i == (n - 1)  &&  run  )  {
		    runmult *= curmult;
		}
	    }
	    else  {
		curmult = 1;
		if(  h[i].rank == h[i - 1].rank + 1  )  {
		    if( run )  {
			++runlength;
		    }
		    else  {
			if(  runlength < 3  )  {	/* only if old short */
			    run = TRUE;
			    runlength = 2;
			    runmult = 1;
			}
		    }
		    runmult *= lastmult;
		}
		else  {
		    if( run )  runmult *= lastmult;	/* if just ended */
		    run = FALSE;
		}
	    }
	}
	pairpoints = ichoose2[ mult1 ] + ichoose2[ mult2 ];
	runpoints = ( runlength >= 3 ? runlength*runmult : 0 );
	return(  pairpoints + runpoints  );
}



/*
 * pegscore tells how many points crd would get if played after
 * the n cards in tbl during pegging
 */

pegscore( crd, tbl, n, sum )

    CARD		crd,  tbl[];
    int			n;
    int			sum;
{
	BOOLEAN			got[ RANKS ];
	register  int		i, j, scr;
	int			k, lo, hi;

	sum += VAL( crd.rank );
	if(  sum > 31  )  return( -1 );
	if(  sum == 31  ||  sum == 15  )  scr = 2;
	else				  scr = 0;
	if(  !n  )  return( scr );
	j = 1;
	while(  ( crd.rank == tbl[n - j].rank )  &&  ( n - j >= 0 )  )  ++j;
	if( j > 1 )  return( scr + ichoose2[j] );
	if( n < 2 )  return( scr );
	lo = hi = crd.rank;
	for( i = 0; i < RANKS; i++ )  got[i] = FALSE;
	got[ crd.rank ] = TRUE;
	k = -1;
	for( i = n - 1; i >= 0; --i )  {
	    if(  got[ tbl[i].rank ]  )  break;
	    got[ tbl[i].rank ] = TRUE;
	    if(  tbl[i].rank < lo  )  lo = tbl[i].rank;
	    if(  tbl[i].rank > hi  )  hi = tbl[i].rank;
	    for( j = lo; j <= hi; j++ )  if( !got[j] )  break;
	    if(  j > hi )  k = hi - lo + 1;
	}
	if(  k >= 3  )  return( scr + k );
	else		return( scr );
}



/*
 * adjust takes a two card hand that will be put in the crib
 * and returns an adjusted normalized score for the number of
 * points such a crib will get.
 */

adjust( cb, tnv )

    CARD		cb[], tnv;
{
	int			i,  c0,  c1;
	long			scr;

	c0 = cb[0].rank;
	c1 = cb[1].rank;
	if(  c0 > c1  )  {
	    i = c0;
	    c0 = c1;
	    c1 = i;
	}
	if(  cb[0].suit != cb[1].suit  )  scr = crbnescr[ RANKS*c0 + c1 ];
	else				  scr = crbescr[ RANKS*c0 + c1 ];
	if(  scr <= 0  )  {
	    printf( "\nADJUST: internal error %d %d\n",  c0, c1 );
	    exit( 93 );
	}
	return(  (scr + 29400)/58800  );
}