ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: aabda <aabda@student.s19.be>               +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/07/07 17:48:34 by aabda             #+#    #+#             */
/*   Updated: 2022/07/18 12:50:28 by aabda            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	i = 0;
	sign = 1;
	result = 0;
	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] >= '0' && str[i] <= '9')
	{
		result = result * 10 + str[i] - '0';
		i++;
		if (result * sign < INT_MIN)
			return (0);
		if (result * sign > INT_MAX)
			return (-1);
	}
	return (result * sign);
}