/* ************************************************************************** */
/*                                                          LE - /            */
/*                                                              /             */
/*   ft_atoi.c                                        .::    .:/ .      .::   */
/*                                                 +:+:+   +:    +:  +:+:+    */
/*   By: rbousset <marvin@le-101.fr>                +:+   +:    +:    +:+     */
/*                                                 #+#   #+    #+    #+#      */
/*   Created: 2019/10/10 05:32:13 by rbousset     #+#   ##    ##    #+#       */
/*   Updated: 2019/10/15 02:16:20 by rbousset    ###    #+. /#+    ###.fr     */
/*                                                         /                  */
/*                                                        /                   */
/* ************************************************************************** */

#include <libft.h>
#include <inttypes.h>

static int8_t
	ft_setsign(const char c)
{
	int8_t	sign;

	sign = 1;
	if (c == '-')
		sign = -1;
	return (sign);
}

static uint8_t
	ft_seti(const char *str)
{
	uint8_t	i;

	i = 0;
	while (ft_isspace(str[i]))
		i++;
	return (i);
}

int
	ft_atoi(const char *str)
{
	uint8_t	i;
	int8_t	sign;
	long	nb;

	i = ft_seti(str);
	nb = 0;
	sign = 1;
	if (str[i] == '+' || str[i] == '-')
		sign = ft_setsign(str[i++]);
	while (ft_isdigit(str[i]))
	{
		if (nb * 10 + (str[i] - 48) < nb)
		{
			if (sign < 0)
				return (0);
			return (-1);
		}
		nb = nb * 10 + (str[i] - 48);
		i++;
	}
	nb *= sign;
	return ((int)nb);
}