/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   stack_add.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/08 15:52:40 by dgaillet          #+#    #+#             */
/*   Updated: 2025/12/09 08:51:33 by mteriier         ###   ########lyon.fr   */
/*                                                                            */
/* ************************************************************************** */

#include "../push_swap.h"
#include <stdlib.h>

t_stack	*new_stack(int value)
{
	t_stack	*new;

	new = malloc(sizeof(t_stack));
	if (!new)
		return (NULL);
	new->value = value;
	new->next = NULL;
	new->previous = NULL;
	return (new);
}

void	stack_add_back(t_stack **stack, t_stack *new)
{
	if (!stack || !new)
		return ;
	if (*stack == NULL)
	{
		(*stack) = new;
		new->next = new;
		new->previous = new;
	}
	else
	{
		(*stack)->previous->next = new;
		new->previous = (*stack)->previous;
		(*stack)->previous = new;
		new->next = *stack;
	}
}

void	stack_add_front(t_stack **stack, t_stack *new)
{
	if (!stack || !new)
		return ;
	stack_add_back(stack, new);
	*stack = new;
}