/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: narnaud <narnaud@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/10/20 15:50:47 by narnaud           #+#    #+#             */
/*   Updated: 2021/11/15 12:10:47 by narnaud          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static void	ft_strrev(char **str, unsigned int neg)
{
	char	ch;
	size_t	size;
	size_t	i;

	size = ft_strlen(*str);
	if (neg)
		(*str)[size++] = '-';
	i = 0;
	while (i < size / 2)
	{
		ch = (*str)[i];
		(*str)[i] = (*str)[size - i - 1];
		(*str)[size - i - 1] = ch;
		i++;
	}
}

static size_t	get_nbrlength(int nbr)
{
	size_t	i;

	i = 0;
	if (nbr == 0)
		return (1);
	else if (nbr < 0)
		i++;
	while (nbr && ++i)
		nbr = nbr / 10;
	return (i);
}

char	*ft_itoa(int n)
{
	char			*ret;
	unsigned int	i;
	unsigned int	neg;

	if (n == -2147483648)
		return (ft_strdup("-2147483648"));
	if (n == 0)
		return (ft_strdup("0"));
	i = 0;
	neg = 0;
	ret = ft_calloc(get_nbrlength(n) + 1, sizeof(char));
	if (!ret)
		return (NULL);
	if (n < 0)
	{
		n = -n;
		neg = 1;
	}
	while (n)
	{
		ret[i++] = (n % 10) + '0';
		n = n / 10;
	}
	ft_strrev(&ret, neg);
	return (ret);
}