/*      $NetBSD: cards.c,v 1.9 2009/08/12 05:48:04 dholland Exp $       */

/*-
* Copyright (c) 1980, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)cards.c     8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: cards.c,v 1.9 2009/08/12 05:48:04 dholland Exp $");
#endif
#endif /* not lint */

#include <curses.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#include "deck.h"
#include "cribbage.h"


/*
* Initialize a deck of cards to contain one of each type.
*/
void
makedeck(CARD d[])
{
       int i, j, k;

       i = time(NULL);
       i = ((i & 0xff) << 8) | ((i >> 8) & 0xff) | 1;
       srand(i);
       k = 0;
       for (i = 0; i < RANKS; i++)
               for (j = 0; j < SUITS; j++) {
                       d[k].suit = j;
                       d[k++].rank = i;
               }
}

/*
* Given a deck of cards, shuffle it -- i.e. randomize it
* see Knuth, vol. 2, page 125.
*/
void
shuffle(CARD d[])
{
       int j, k;
       CARD c;

       for (j = CARDS; j > 0; --j) {
               k = (rand() >> 4) % j;          /* random 0 <= k < j */
               c = d[j - 1];                   /* exchange (j - 1) and k */
               d[j - 1] = d[k];
               d[k] = c;
       }
}

/*
* return true if the two cards are equal...
*/
static int
eq(CARD a, CARD b)
{
       return ((a.rank == b.rank) && (a.suit == b.suit));
}

/*
* is_one returns TRUE if a is in the set of cards b
*/
int
is_one(CARD a, const CARD b[], int n)
{
       int i;

       for (i = 0; i < n; i++)
               if (eq(a, b[i]))
                       return (TRUE);
       return (FALSE);
}

/*
* remove the card a from the deck d of n cards
*/
void
cremove(CARD a, CARD d[], int n)
{
       int i, j;

       for (i = j = 0; i < n; i++)
               if (!eq(a, d[i]))
                       d[j++] = d[i];
       if (j < n)
               d[j].suit = d[j].rank = EMPTY;
}

/*
* sorthand:
*      Sort a hand of n cards
*/
void
sorthand(CARD h[], int n)
{
       CARD *cp, *endp;
       CARD c;

       for (endp = &h[n]; h < endp - 1; h++)
               for (cp = h + 1; cp < endp; cp++)
                       if ((cp->rank < h->rank) ||
                           (cp->rank == h->rank && cp->suit < h->suit)) {
                               c = *h;
                               *h = *cp;
                               *cp = c;
                       }
}