ft_atol.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atol.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: sudaniel <sudaniel@student.42heilbronn.de  +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/11/30 07:24:41 by sudaniel          #+#    #+#             */
/*   Updated: 2024/12/09 13:09:25 by sudaniel         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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