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score.c revision 1.13 
      1 /*	$NetBSD: score.c,v 1.13 2007/12/15 19:44:39 perry Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1980, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)score.c	8.1 (Berkeley) 5/31/93";
     36 #else
     37 __RCSID("$NetBSD: score.c,v 1.13 2007/12/15 19:44:39 perry Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <curses.h>
     42 #include <stdio.h>
     43 #include <stdlib.h>
     44 #include <string.h>
     45 
     46 #include "deck.h"
     47 #include "cribbage.h"
     48 
     49 /*
     50  * the following arrays give the sum of the scores of the (50 2)*48 = 58800
     51  * hands obtainable for the crib given the two cards whose ranks index the
     52  * array.  the two arrays are for the case where the suits are equal and
     53  * not equal respectively
     54  */
     55 const long crbescr[169] = {
     56     -10000, 271827, 278883, 332319, 347769, 261129, 250653, 253203, 248259,
     57     243435, 256275, 237435, 231051, -10000, -10000, 412815, 295707, 349497,
     58     267519, 262521, 259695, 254019, 250047, 262887, 244047, 237663, -10000,
     59     -10000, -10000, 333987, 388629, 262017, 266787, 262971, 252729, 254475,
     60     267315, 248475, 242091, -10000, -10000, -10000, -10000, 422097, 302787,
     61     256437, 263751, 257883, 254271, 267111, 248271, 241887, -10000, -10000,
     62     -10000, -10000, -10000, 427677, 387837, 349173, 347985, 423861, 436701,
     63     417861, 411477, -10000, -10000, -10000, -10000, -10000, -10000, 336387,
     64     298851, 338667, 236487, 249327, 230487, 224103, -10000, -10000, -10000,
     65     -10000, -10000, -10000, -10000, 408483, 266691, 229803, 246195, 227355,
     66     220971, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
     67     300675, 263787, 241695, 226407, 220023, -10000, -10000, -10000, -10000,
     68     -10000, -10000, -10000, -10000, -10000, 295635, 273543, 219771, 216939,
     69     -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
     70     -10000, 306519, 252747, 211431, -10000, -10000, -10000, -10000, -10000,
     71     -10000, -10000, -10000, -10000, -10000, -10000, 304287, 262971, -10000,
     72     -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
     73     -10000, -10000, 244131, -10000, -10000, -10000, -10000, -10000, -10000,
     74     -10000, -10000, -10000, -10000, -10000, -10000, -10000
     75 };
     76 
     77 const long crbnescr[169] = {
     78     325272, 260772, 267828, 321264, 336714, 250074, 239598, 242148, 237204,
     79     232380, 246348, 226380, 219996, -10000, 342528, 401760, 284652, 338442,
     80     256464, 251466, 248640, 242964, 238992, 252960, 232992, 226608, -10000,
     81     -10000, 362280, 322932, 377574, 250962, 255732, 251916, 241674, 243420,
     82     257388, 237420, 231036, -10000, -10000, -10000, 360768, 411042, 291732,
     83     245382, 252696, 246828, 243216, 257184, 237216, 230832, -10000, -10000,
     84     -10000, -10000, 528768, 416622, 376782, 338118, 336930, 412806, 426774,
     85     406806, 400422, -10000, -10000, -10000, -10000, -10000, 369864, 325332,
     86     287796, 327612, 225432, 239400, 219432, 213048, -10000, -10000, -10000,
     87     -10000, -10000, -10000, 359160, 397428, 255636, 218748, 236268, 216300,
     88     209916, -10000, -10000, -10000, -10000, -10000, -10000, -10000, 331320,
     89     289620, 252732, 231768, 215352, 208968, -10000, -10000, -10000, -10000,
     90     -10000, -10000, -10000, -10000, 325152, 284580, 263616, 208716, 205884,
     91     -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
     92     321240, 296592, 241692, 200376, -10000, -10000, -10000, -10000, -10000,
     93     -10000, -10000, -10000, -10000, -10000, 348600, 294360, 253044, -10000,
     94     -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000, -10000,
     95     -10000, 308664, 233076, -10000, -10000, -10000, -10000, -10000, -10000,
     96     -10000, -10000, -10000, -10000, -10000, -10000, 295896
     97 };
     98 
     99 static const int ichoose2[5] = { 0, 0, 2, 6, 12 };
    100 static int pairpoints, runpoints;		/* Globals from pairuns. */
    101 
    102 /*
    103  * scorehand:
    104  *	Score the given hand of n cards and the starter card.
    105  *	n must be <= 4
    106  */
    107 int
    108 scorehand(const CARD hand[], CARD starter, int n, BOOLEAN crb,
    109           BOOLEAN do_explain)
    110 {
    111 	int i, k;
    112 	int hscore;
    113 	BOOLEAN flag;
    114 	CARD h[(CINHAND + 1)];
    115 	char buf[32];
    116 
    117 	explan[0] = '\0';	/* initialize explanation */
    118 	hscore = 0;
    119 	flag = TRUE;
    120 	k = hand[0].suit;
    121 	for (i = 0; i < n; i++) {	/* check for flush */
    122 		flag = (flag && (hand[i].suit == k));
    123 		if (hand[i].rank == JACK)	/* check for his nibs */
    124 			if (hand[i].suit == starter.suit) {
    125 				hscore++;
    126 				if (do_explain)
    127 					strcat(explan, "His Nobs");
    128 			}
    129 		h[i] = hand[i];
    130 	}
    131 
    132 	if (flag && n >= CINHAND) {
    133 		if (do_explain && explan[0] != '\0')
    134 			strcat(explan, ", ");
    135 		if (starter.suit == k) {
    136 			hscore += 5;
    137 			if (do_explain)
    138 				strcat(explan, "Five-flush");
    139 		} else
    140 			if (!crb) {
    141 				hscore += 4;
    142 				if (do_explain && explan[0] != '\0')
    143 					strcat(explan, ", Four-flush");
    144 				else
    145 					strcpy(explan, "Four-flush");
    146 			}
    147 	}
    148 	if (do_explain && explan[0] != '\0')
    149 		strcat(explan, ", ");
    150 	h[n] = starter;
    151 	sorthand(h, n + 1);	/* sort by rank */
    152 	i = 2 * fifteens(h, n + 1);
    153 	hscore += i;
    154 	if (do_explain) {
    155 		if (i > 0) {
    156 			(void) sprintf(buf, "%d points in fifteens", i);
    157 			strcat(explan, buf);
    158 		} else
    159 			strcat(explan, "No fifteens");
    160 	}
    161 	i = pairuns(h, n + 1);
    162 	hscore += i;
    163 	if (do_explain) {
    164 		if (i > 0) {
    165 			(void) sprintf(buf, ", %d points in pairs, %d in runs",
    166 			    pairpoints, runpoints);
    167 			strcat(explan, buf);
    168 		} else
    169 			strcat(explan, ", No pairs/runs");
    170 	}
    171 	return (hscore);
    172 }
    173 
    174 /*
    175  * fifteens:
    176  *	Return number of fifteens in hand of n cards
    177  */
    178 int
    179 fifteens(const CARD hand[], int n)
    180 {
    181 	int *sp, *np;
    182 	int i;
    183 	const CARD *endp;
    184 	static int sums[15], nsums[15];
    185 
    186 	np = nsums;
    187 	sp = sums;
    188 	i = 16;
    189 	while (--i) {
    190 		*np++ = 0;
    191 		*sp++ = 0;
    192 	}
    193 	for (endp = &hand[n]; hand < endp; hand++) {
    194 		i = hand->rank + 1;
    195 		if (i > 10)
    196 			i = 10;
    197 		np = &nsums[i];
    198 		np[-1]++;	/* one way to make this */
    199 		sp = sums;
    200 		while (i < 15) {
    201 			*np++ += *sp++;
    202 			i++;
    203 		}
    204 		sp = sums;
    205 		np = nsums;
    206 		i = 16;
    207 		while (--i)
    208 			*sp++ = *np++;
    209 	}
    210 	return sums[14];
    211 }
    212 
    213 /*
    214  * pairuns returns the number of points in the n card sorted hand
    215  * due to pairs and runs
    216  * this routine only works if n is strictly less than 6
    217  * sets the globals pairpoints and runpoints appropriately
    218  */
    219 int
    220 pairuns(const CARD h[], int n)
    221 {
    222 	int i;
    223 	int runlength, runmult, lastmult, curmult;
    224 	int mult1, mult2, pair1, pair2;
    225 	BOOLEAN run;
    226 
    227 	run = TRUE;
    228 	runlength = 1;
    229 	mult1 = 1;
    230 	pair1 = -1;
    231 	mult2 = 1;
    232 	pair2 = -1;
    233 	curmult = runmult = 1;
    234 	for (i = 1; i < n; i++) {
    235 		lastmult = curmult;
    236 		if (h[i].rank == h[i - 1].rank) {
    237 			if (pair1 < 0) {
    238 				pair1 = h[i].rank;
    239 				mult1 = curmult = 2;
    240 			} else {
    241 				if (h[i].rank == pair1) {
    242 					curmult = ++mult1;
    243 				} else {
    244 					if (pair2 < 0) {
    245 						pair2 = h[i].rank;
    246 						mult2 = curmult = 2;
    247 					} else {
    248 						curmult = ++mult2;
    249 					}
    250 				}
    251 			}
    252 			if (i == (n - 1) && run) {
    253 				runmult *= curmult;
    254 			}
    255 		} else {
    256 			curmult = 1;
    257 			if (h[i].rank == h[i - 1].rank + 1) {
    258 				if (run) {
    259 					++runlength;
    260 				} else {
    261 							/* only if old short */
    262 					if (runlength < 3) {
    263 						run = TRUE;
    264 						runlength = 2;
    265 						runmult = 1;
    266 					}
    267 				}
    268 				runmult *= lastmult;
    269 			} else {
    270 							/* if just ended */
    271 				if (run)
    272 					runmult *= lastmult;
    273 				run = FALSE;
    274 			}
    275 		}
    276 	}
    277 	pairpoints = ichoose2[mult1] + ichoose2[mult2];
    278 	runpoints = (runlength >= 3 ? runlength * runmult : 0);
    279 	return (pairpoints + runpoints);
    280 }
    281 
    282 /*
    283  * pegscore tells how many points crd would get if played after
    284  * the n cards in tbl during pegging
    285  */
    286 int
    287 pegscore(CARD crd, const CARD tbl[], int n, int sum)
    288 {
    289 	BOOLEAN got[RANKS];
    290 	int i, j, scr;
    291 	int k, lo, hi;
    292 
    293 	sum += VAL(crd.rank);
    294 	if (sum > 31)
    295 		return (-1);
    296 	if (sum == 31 || sum == 15)
    297 		scr = 2;
    298 	else
    299 		scr = 0;
    300 	if (!n)
    301 		return (scr);
    302 	j = 1;
    303 	while ((crd.rank == tbl[n - j].rank) && (n - j >= 0))
    304 		++j;
    305 	if (j > 1)
    306 		return (scr + ichoose2[j]);
    307 	if (n < 2)
    308 		return (scr);
    309 	lo = hi = crd.rank;
    310 	for (i = 0; i < RANKS; i++)
    311 		got[i] = FALSE;
    312 	got[crd.rank] = TRUE;
    313 	k = -1;
    314 	for (i = n - 1; i >= 0; --i) {
    315 		if (got[tbl[i].rank])
    316 			break;
    317 		got[tbl[i].rank] = TRUE;
    318 		if (tbl[i].rank < lo)
    319 			lo = tbl[i].rank;
    320 		if (tbl[i].rank > hi)
    321 			hi = tbl[i].rank;
    322 		for (j = lo; j <= hi; j++)
    323 			if (!got[j])
    324 				break;
    325 		if (j > hi)
    326 			k = hi - lo + 1;
    327 	}
    328 	if (k >= 3)
    329 		return (scr + k);
    330 	else
    331 		return (scr);
    332 }
    333 
    334 /*
    335  * adjust takes a two card hand that will be put in the crib
    336  * and returns an adjusted normalized score for the number of
    337  * points such a crib will get.
    338  */
    339 int
    340 adjust(const CARD cb[], CARD tnv __unused)
    341 {
    342 	long scr;
    343 	int i, c0, c1;
    344 
    345 	c0 = cb[0].rank;
    346 	c1 = cb[1].rank;
    347 	if (c0 > c1) {
    348 		i = c0;
    349 		c0 = c1;
    350 		c1 = i;
    351 	}
    352 	if (cb[0].suit != cb[1].suit)
    353 		scr = crbnescr[RANKS * c0 + c1];
    354 	else
    355 		scr = crbescr[RANKS * c0 + c1];
    356 	if (scr <= 0) {
    357 		printf("\nADJUST: internal error %d %d\n", c0, c1);
    358 		exit(93);
    359 	}
    360 	return ((scr + 29400) / 58800);
    361 }
    362