ft_atol.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atol.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rlechapt <rlechapt@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2015/02/02 16:28:33 by rlechapt          #+#    #+#             */
/*   Updated: 2015/02/02 16:36:21 by rlechapt         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

long	ft_atol(const char *str)
{
	int		i;
	int		sign;
	long	val;

	i = 0;
	sign = 1;
	val = 0;
	while (((str[i] >= 9 && str[i] <= 13) || str[i] == 32) && str[i])
		i++;
	if (str[i] == '-' || str[i] == '+')
	{
		if (str[i] == '-')
			sign = -1;
		i++;
	}
	while (str[i] >= '0' && str[i] <= '9' && str[i] != '\0')
	{
		val = (val * 10) + (str[i] - 48);
		i++;
	}
	return (val * sign);
}