#include "stack.h"

void stack_add(void* _data, struct stack** _stackpointer)
{
	struct stack* newsp = malloc(sizeof(*newsp));

	newsp->data = _data;
	newsp->next = *_stackpointer;
	*_stackpointer = newsp;
}

void* stack_get(struct stack** _stackpointer)
{
	void* return_data;
	struct stack* oldsp; //Old stackpointer

	if(!*_stackpointer)
		return NULL;

	return_data = (*_stackpointer)->data;
	oldsp = *_stackpointer;
	*_stackpointer = (*_stackpointer)->next;
	free(oldsp);

	return return_data;
}

void stack_init(struct stack** _stackpointer)
{
	stack_flush(_stackpointer);
	*_stackpointer = NULL;
}

void stack_flush(struct stack** _stackpointer)
{
	while(*_stackpointer)
		stack_get(_stackpointer);
}