ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: jode-vri <jode-vri@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/09/06 21:56:48 by jode-vri          #+#    #+#             */
/*   Updated: 2020/09/06 22:02:46 by jode-vri         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

int	ft_atoi(const char *str)
{
	int	i;
	int	neg;
	int	nb;

	i = 0;
	neg = 1;
	nb = 0;
	while ((str[i] >= 9 && str[i] <= 13) || str[i] == 32)
		i++;
	if (str[i] == 45)
	{
		neg = -1;
		i++;
	}
	else if (str[i] == 43)
		i++;
	while (str[i] && (str[i] >= 48 && str[i] <= 57))
	{
		nb = (nb * 10) + (str[i] - '0');
		i++;
	}
	return (nb * neg);
}