4.3BSD - /usr/src/games/cribbage/cards.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: static char sccsid[] = "@(#)cards.c	5.1 (Berkeley) 5/30/85";
   9: #endif not lint
  10: 
  11: #include    <stdio.h>
  12: #include    "deck.h"
  13: 
  14: 
  15: /*
  16:  * initialize a deck of cards to contain one of each type
  17:  */
  18: 
  19: makedeck( d )
  20: 
  21:     CARD    d[];
  22: {
  23:     register  int       i, j, k;
  24:     long            time();
  25: 
  26:     i = time( (long *) 0 );
  27:     i = ( (i&0xff) << 8 ) | ( (i >> 8)&0xff ) | 1;
  28:     srand( i );
  29:     k = 0;
  30:     for( i = 0; i < RANKS; i++ )  {
  31:         for( j = 0; j < SUITS; j++ )  {
  32:         d[k].suit = j;
  33:         d[k++].rank = i;
  34:         }
  35:     }
  36: }
  37: 
  38: 
  39: 
  40: /*
  41:  * given a deck of cards, shuffle it -- i.e. randomize it
  42:  * see Knuth, vol. 2, page 125
  43:  */
  44: 
  45: shuffle( d )
  46: 
  47:     CARD    d[];
  48: {
  49:     register  int       j, k;
  50:     CARD            c;
  51: 
  52:     for( j = CARDS; j > 0; --j )  {
  53:         k = ( rand() >> 4 ) % j;        /* random 0 <= k < j */
  54:         c = d[j - 1];           /* exchange (j - 1) and k */
  55:         d[j - 1] = d[k];
  56:         d[k] = c;
  57:     }
  58: }
  59: 
  60: 
  61: 
  62: /*
  63:  * return true if the two cards are equal...
  64:  */
  65: 
  66: eq( a, b )
  67: 
  68:     CARD        a, b;
  69: {
  70:     return(  ( a.rank == b.rank )  &&  ( a.suit == b.suit )  );
  71: }
  72: 
  73: 
  74: 
  75: /*
  76:  * isone returns TRUE if a is in the set of cards b
  77:  */
  78: 
  79: isone( a, b, n )
  80: 
  81:     CARD        a, b[];
  82:     int         n;
  83: {
  84:     register  int       i;
  85: 
  86:     for( i = 0; i < n; i++ )  {
  87:         if(  eq( a, b[i] )   )  return( TRUE );
  88:     }
  89:     return( FALSE );
  90: }
  91: 
  92: 
  93: 
  94: /*
  95:  * remove the card a from the deck d of n cards
  96:  */
  97: 
  98: remove( a, d, n )
  99: 
 100:     CARD        a, d[];
 101:     int         n;
 102: {
 103:     register  int       i, j;
 104: 
 105:     j = 0;
 106:     for( i = 0; i < n; i++ )  {
 107:         if(  !eq( a, d[i] )  )  d[j++] = d[i];
 108:     }
 109:     if(  j < n  )  d[j].suit = d[j].rank = EMPTY;
 110: }
 111: 
 112: 
 113: 
 114: /*
 115:  * sorthand:
 116:  *	Sort a hand of n cards
 117:  */
 118: sorthand(h, n)
 119: register CARD       h[];
 120: int         n;
 121: {
 122:     register CARD       *cp, *endp;
 123:     CARD            c;
 124: 
 125:     for (endp = &h[n]; h < endp - 1; h++)
 126:         for (cp = h + 1; cp < endp; cp++)
 127:         if ((cp->rank < h->rank) ||
 128:              (cp->rank == h->rank && cp->suit < h->suit)) {
 129:             c = *h;
 130:             *h = *cp;
 131:             *cp = c;
 132:         }
 133: }

Defined functions

Defined variables