ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: belkarto <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/08 20:07:18 by belkarto          #+#    #+#             */
/*   Updated: 2022/10/22 19:07:07 by belkarto         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
#include  "libft.h"

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

	i = 0;
	res = 0;
	sign = 1;
	while ((str[i] <= 13 && str[i] >= 9) || str[i] == 32)
		i++;
	if (str[i] == '-')
	{
		sign *= -1;
		i++;
	}
	else if (str[i] == '+')
		i++;
	while (str[i] <= '9' && str[i] >= '0')
	{
		res = (res * 10);
		res += str[i] - '0';
		i++;
	}
	return (res * sign);
}