ft_atoi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_atoi.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tauer <tauer@student.42.fr>                +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/11/06 15:29:26 by tauer             #+#    #+#             */
/*   Updated: 2023/11/06 15:29:26 by tauer            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_isspace(char c)
{
	return (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t'
		|| c == '\v');
}

int	ft_atoi(const char *str)
{
	size_t		i;
	int			sign;
	long int	num;

	i = 0;
	sign = 1;
	num = 0;
	while (str[i] && ft_isspace(str[i]))
		i++;
	if (str[i] == '-' || str[i] == '+')
		if (str[i++] == '-')
			sign *= -1;
	while (str[i] >= '0' && str[i] <= '9')
		num = (num * 10) + (str[i++] - '0');
	return (num * sign);
}

// int main(void)
// {
//     char *str = "     124566322ABCDEF";

//     printf("%d\n", ft_atoi(str));

//     return (0);
// }