ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hykang <hykang@student.42seoul.kr>         +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/01/25 16:03:00 by hykang            #+#    #+#             */
/*   Updated: 2022/02/02 22:29:58 by hykang           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_atoi(const char *str)
{
	long long	n;
	int			neg;

	n = 0;
	neg = 1;
	while ((*str >= 9 && *str <= 13) || *str == 32)
		str++;
	if (*str == '-')
		neg *= -1;
	if (*str == '-' || *str == '+')
		str++;
	while (*str && *str >= '0' && *str <= '9')
	{
		n = n * 10 + (*str - '0');
		str++;
	}
	return (neg * n);
}