ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: edboutil <edboutil@student.42lyon.fr>      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/11/13 14:23:05 by edboutil          #+#    #+#             */
/*   Updated: 2022/12/01 14:02:19 by edboutil         ###   ########lyon.fr   */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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