/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gbaconni <gbaconni@42lausanne.ch>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/10/11 14:33:40 by gbaconni          #+#    #+#             */
/*   Updated: 2021/10/23 16:23:10 by gbaconni         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	ft_intlen(int n);
static char	*ft_strrev(char *s);

char	*ft_itoa(int n)
{
	char	*s;
	int		i;
	long	nbr;

	s = (char *) ft_calloc((ft_intlen(n) + 1), sizeof(char));
	if (s == NULL)
		return (NULL);
	i = 0;
	nbr = n;
	if (nbr == 0)
		s[i++] = '0';
	if (nbr < 0)
		nbr = -nbr;
	while (nbr > 0)
	{
		s[i++] = '0' + nbr % 10;
		nbr /= 10;
	}
	if (n < 0)
		s[i++] = '-';
	s[i] = '\0';
	return (ft_strrev(s));
}

static int	ft_intlen(int n)
{
	size_t	len;

	len = 0;
	if (n < 0 || n == 0)
		len++;
	while (!(n < 1 && n > -1))
	{
		n /= 10;
		len++;
	}
	return (len);
}

static char	*ft_strrev(char *s)
{
	int		len;
	int		i;
	int		j;
	char	c;

	len = ft_strlen(s);
	i = 0;
	while (i < (len / 2))
	{
		j = len - 1 - i;
		c = s[i];
		s[i] = s[j];
		s[j] = c;
		i++;
	}
	return (s);
}