62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
#include <malloc.h>
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#include <stdbool.h>
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#include "stack.h"
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void initialize_stack(struct stack **stack) {
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*stack = malloc(sizeof(**stack));
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(*stack)->card = NULL;
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(*stack)->next = NULL;
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return;
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}
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bool empty(struct stack *stack) {
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return(stack->card == NULL);
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}
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int length(struct stack *stack) {
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struct stack *iterator = stack;
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int length = 0;
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if (!empty(stack)) {
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length = 1;
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while (iterator->next != NULL) {
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length++;
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iterator = iterator->next;
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}
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}
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return(length);
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}
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void push(struct stack **stack, struct card *card) {
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struct stack *new_stack = NULL;
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if (empty(*stack)) {
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(*stack)->card = card;
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} else {
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initialize_stack(&new_stack);
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new_stack->card = card;
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new_stack->next = (*stack);
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*stack = new_stack;
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}
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}
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/* FIXME: uglyness inside if statement */
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struct stack *pop(struct stack **stack) {
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struct stack *popped_entry = NULL;
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if(!empty(*stack)) {
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popped_entry = *stack;
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if (length(*stack) == 1) {
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initialize_stack(stack);
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} else {
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*stack = (*stack)->next;
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}
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popped_entry->next = NULL;
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}
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return(popped_entry);
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}
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