long_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   long_atoi.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rdragan <rdragan@student.42heilbronn.de    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/04/24 14:03:29 by rdragan           #+#    #+#             */
/*   Updated: 2023/04/25 19:54:23 by rdragan          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

long long	long_atoi(char *str)
{
	long long	res;
	int			sign;
	int			i;

	res = 0;
	sign = 1;
	i = 0;
	while (str[i] == ' ' || str[i] == '\t')
		i++;
	if (str[i] == '+' || str[i] == '-')
	{
		if (str[i] == '-')
			sign = -1;
		i++;
	}
	while (ft_isdigit(str[i]))
	{
		res = res * 10 + str[i] - '0';
		i++;
	}
	return (res * sign);
}