/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: erey-bet <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/07/21 08:21:05 by erey-bet          #+#    #+#             */
/*   Updated: 2022/10/11 22:44:20 by erey-bet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_isspace(char c)
{
	return (c == ' ' || c == '\f'
		||c == '\n' || c == '\r' || c == '\t' || c == '\v');
}

int	ft_atoi(const char *nptr)
{
	long	result;
	int		sign;

	while (ft_isspace(*nptr))
		nptr++;
	sign = 1;
	if (*nptr == '+' || *nptr == '-')
	{
		if (*nptr == '-')
			sign = -1;
		nptr++;
	}
	result = 0;
	while (*nptr >= '0' && *nptr <= '9')
	{
		if (result >= 2147483647 && sign == 1)
			return (-1);
		else if (result >= 2147483647)
			return (0);
		result = result * 10 + *nptr - '0';
		nptr++;
	}
	return (result * sign);
}