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