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stack#push and stack#pop less destructive.

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This commit is contained in:
Murilo Pereira
2011-05-01 05:36:46 -03:00
parent 5d96d20893
commit 854184c2fd
2 changed files with 25 additions and 22 deletions
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27
lib/stack.c
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@@ -81,10 +81,10 @@ void push(struct stack **stack, struct card *card) {
if (card) {
if (empty(*stack)) {
(*stack)->card = card;
(*stack)->card = duplicate_card(card);
} else {
allocate_stack(&new_stack);
new_stack->card = card;
new_stack->card = duplicate_card(card);
new_stack->next = (*stack);
*stack = new_stack;
}
@@ -95,20 +95,23 @@ struct stack *pop(struct stack **stack) {
struct stack *popped_entry = NULL;
if(!empty(*stack)) {
popped_entry = *stack;
/* As what's considered an empty stack is an allocated and initialized
* stack structure, we make sure pop doesn't make '*stack' point to NULL
* when popping a stack with only 1 element. */
allocate_stack(&popped_entry);
initialize_stack(popped_entry);
popped_entry->card = duplicate_card((*stack)->card);
popped_entry->next = NULL;
if (length(*stack) == 1) {
allocate_stack(stack);
initialize_stack(*stack);
set_frame((*stack)->card->frame,
(*stack)->card->frame->start_y,
(*stack)->card->frame->start_x);
/* An empty stack is a stack with a blank top card
* and with stack->next == NULL. */
set_card((*stack)->card,
NO_VALUE,
NO_SUIT,
NO_FACE,
(*stack)->card->frame->start_y,
(*stack)->card->frame->start_x);
(*stack)->next = NULL;
} else {
*stack = (*stack)->next;
}
popped_entry->next = NULL;
}
return(popped_entry);