ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: retahri <retahri@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/22 22:56:13 by retahri           #+#    #+#             */
/*   Updated: 2024/11/04 15:09:02 by retahri          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	i = 0;
	result = 0;
	sign = 1;
	while ((str[i] >= 9 && str[i] <= 13) || str[i] == 32)
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			sign *= -1;
		i++;
	}
	while (str[i] >= '0' && str[i] <= '9')
	{
		result = (result * 10) + str[i] - 48;
		i++;
		if (result > 9223372036854775807 && sign == 1)
			return (-1);
		else if (result > 9223372036854775807 && sign == -1)
			return (0);
	}
	return (result * sign);
}

// #include <stdlib.h>
// #include <stdio.h>

// int main()
// {
// 	printf("%d\n", ft_atoi("214745156156156156183648"));
// 	printf("%d",atoi(" 214745156156156156183648"));
// 	return (0);
// }