ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: amahla <amahla@student.42.fr>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/05/02 12:27:11 by amahla            #+#    #+#             */
/*   Updated: 2022/05/05 14:45:30 by amahla           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include"libft.h"

int	ft_atoi(const char *nptr)
{
	size_t	i;
	int		sign;
	int		nb;

	i = 0;
	sign = 1;
	nb = 0;
	if (!nptr)
		return (0);
	while ((nptr[i] >= 9 && nptr[i] <= 13) || nptr[i] == ' ')
		i++;
	if (nptr[i] == '+' || nptr[i] == '-')
	{
		if (nptr[i] == '-')
			sign *= -1;
		i++;
	}
	while (nptr[i] >= '0' && nptr[i] <= '9')
	{
		nb = nb * 10 + nptr[i] - 48;
		i++;
	}
	return (nb * sign);
}