/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   stack_core.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cacharle <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/01/19 06:37:45 by cacharle          #+#    #+#             */
/*   Updated: 2021/09/10 10:32:43 by charles          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "common.h"

t_stack	*stack_new(int size)
{
	t_stack	*stack;

	stack = (t_stack *)malloc(sizeof(t_stack));
	if (stack == NULL)
		return (NULL);
	stack->elements = (int *)malloc(sizeof(int) * size);
	if (stack->elements == NULL)
	{
		free(stack);
		return (NULL);
	}
	stack->top = -1;
	stack->tag = STACK_NO_TAG;
	return (stack);
}

int	stack_destroy(t_stack *stack)
{
	if (stack == NULL)
		return (1);
	free(stack->elements);
	free(stack);
	return (1);
}

void	stack_push(t_stack *stack, int n)
{
	stack->top++;
	stack->elements[stack->top] = n;
}

void	stack_pop(t_stack *stack)
{
	if (stack_empty(stack))
		return ;
	stack->top--;
}

int	stack_peek(t_stack *stack)
{
	if (stack_empty(stack))
		return (0);
	return (stack->elements[stack->top]);
}