ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mfebvay <mfebvay@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2013/11/20 19:44:33 by mfebvay           #+#    #+#             */
/*   Updated: 2015/01/20 20:01:36 by mfebvay          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

int		ft_atoi(const char *str)
{
	int		sum;
	int		sign;

	sum = 0;
	while ((*str >= 9 && *str <= 13) || *str == ' ')
		str++;
	if ((sign = (*str == '-' ? -1 : 1)) == -1 || *str == '+')
		str++;
	while (*str >= '0' && *str <= '9')
		sum = sum * 10 + *str++ - '0';
	return (sum * sign);
}