ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cmyrtle <cmyrtle@student.21-school.ru>     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/05/17 23:28:32 by cmyrtle           #+#    #+#             */
/*   Updated: 2020/05/26 17:31:23 by cmyrtle          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	long long	i;
	long long	res;
	long long	sign;

	i = 0;
	res = 0;
	sign = 1;
	while ((7 < str[i] && str[i] <= 13) || str[i] == ' ')
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			sign *= -1;
		i++;
	}
	while (str[i] >= '0' && str[i] <= '9')
	{
		res = res * 10 + (str[i] - 48);
		i++;
	}
	return ((int)res * sign);
}