/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rbousset <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/02/14 17:06:22 by rbousset          #+#    #+#             */
/*   Updated: 2020/02/14 17:07:24 by rbousset         ###   ########lyon.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);
}