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the man page says it is impossible to cheat, but since the shuffle is

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lopsided, a sharp counter can detect uneven permutations. fix this by
using knuth shuffle.
ok mlarkin pjanzen
This commit is contained in:
tedu 2014-11-03 19:18:16 +00:00
parent e3490c9c4a
commit a8ed32d4ad
1 changed files with 3 additions and 3 deletions
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6
games/canfield/canfield/canfield.c
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@ -1,4 +1,4 @@
/* $OpenBSD: canfield.c,v 1.13 2013/08/29 20:22:11 naddy Exp $ */
/* $OpenBSD: canfield.c,v 1.14 2014/11/03 19:18:16 tedu Exp $ */
/* $NetBSD: canfield.c,v 1.7 1995/05/13 07:28:35 jtc Exp $ */
/*
@ -533,8 +533,8 @@ shuffle(struct cardtype *deck[])
deck[i]->visible = FALSE;
deck[i]->paid = FALSE;
}
for (i = decksize-1; i>=0; i--) {
j = arc4random_uniform(decksize);
for (i = decksize - 1; i > 0; i--) {
j = arc4random_uniform(i + 1);
if (i != j) {
temp = deck[i];
deck[i] = deck[j];