NetBSD/games/cribbage/cards.c

162 lines
3.6 KiB
C

/*
* Copyright (c) 1980 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static char sccsid[] = "@(#)cards.c 5.5 (Berkeley) 2/28/91";
#endif /* not lint */
#include <stdio.h>
#include "deck.h"
/*
* initialize a deck of cards to contain one of each type
*/
makedeck( d )
CARD d[];
{
register int i, j, k;
long time();
i = time( (long *) 0 );
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
*/
shuffle( d )
CARD d[];
{
register 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...
*/
eq( a, b )
CARD a, b;
{
return( ( a.rank == b.rank ) && ( a.suit == b.suit ) );
}
/*
* isone returns TRUE if a is in the set of cards b
*/
isone( a, b, n )
CARD a, b[];
int n;
{
register 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
*/
cremove( a, d, n )
CARD a, d[];
int n;
{
register int i, j;
j = 0;
for( i = 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
*/
sorthand(h, n)
register CARD h[];
int n;
{
register 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;
}
}