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Really, don't change the stack when calling stack#reverse.

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This commit is contained in:
Murilo Pereira 2011-05-01 02:04:16 -03:00
parent 0e0c44f5c6
commit 0a37b5982a
2 changed files with 8 additions and 6 deletions
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6
lib/stack.c
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@ -97,12 +97,12 @@ struct stack *pop(struct stack **stack) {
struct stack *reverse(struct stack *stack) {
if (length(stack) > 1) {
struct stack *tmp_stack;
struct stack *tmp_stack, *iterator;
allocate_stack(&tmp_stack);
initialize_stack(tmp_stack);
while (!empty(stack)) {
push(&tmp_stack, pop((&stack))->card);
for (iterator = stack; iterator; iterator = iterator->next) {
push(&tmp_stack, iterator->card);
}
return(tmp_stack);
} else {

8
test/stack_test.c
View File

@ -276,7 +276,7 @@ void test_reverse_on_stack_with_more_than_one_element() {
}
void test_reverse_should_not_change_stack() {
struct stack *stack, *old_stack;
struct stack *stack, *old_stack, *old_stack_address;
struct card *card[3];
allocate_stack(&stack);
@ -287,10 +287,12 @@ void test_reverse_should_not_change_stack() {
set_card(card[i], TWO + i, DIAMONDS + i, EXPOSED, 0, 0);
push(&stack, card[i]);
}
old_stack = stack;
old_stack_address = stack;
old_stack = duplicate_stack(stack);
reverse(stack);
assert(stack == old_stack);
assert(stack == old_stack_address);
assert(stacks_equal(stack, old_stack));
free_stack(stack);
}