ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ybouzgao <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2017/11/07 15:49:29 by ybouzgao          #+#    #+#             */
/*   Updated: 2017/11/09 16:58:35 by ybouzgao         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

int		ft_atoi(const char *str)
{
	int i;
	int number;
	int n;

	i = 0;
	n = 1;
	number = 0;
	while (str[i] == ' ' || str[i] == '\f' || str[i] == '\n' ||
			str[i] == '\r' || str[i] == '\t' || str[i] == '\v')
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			n = -1;
		i++;
	}
	while (str[i] >= '0' && str[i] <= '9')
	{
		number = number * 10 + str[i] - '0';
		i++;
	}
	return (n * number);
}