/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_ntoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gvoelkne <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/05/01 08:25:10 by gvoelkne          #+#    #+#             */
/*   Updated: 2026/05/07 09:28:37 by gvoelkne         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_printf.h"

static unsigned long	get_positive(long n)
{
	if (n < 0)
		return (-(unsigned long)n);
	return (n);
}

static char	*ntoa(long num, int base, char *res, unsigned int res_size)
{
	int				is_neg;
	unsigned long	n;
	unsigned long	curr;

	curr = 0;
	is_neg = 0;
	if (num < 0)
		is_neg = 1;
	n = get_positive(num);
	res[--res_size] = '\0';
	while (n > 0)
	{
		curr = n % base;
		if (curr > 9)
			curr = (curr - 10) + 'A';
		else
			curr += '0';
		res[(res_size - 1)] = curr;
		n /= base;
		res_size -= 1;
	}
	if (is_neg)
		res[0] = '-';
	return (res);
}

char	*ft_ntoa(long num, int base)
{
	int				is_neg;
	char			*res;
	unsigned int	res_size;
	unsigned long	n;
	unsigned long	curr;

	n = get_positive(num);
	if (n == 0)
		return (ft_strdup("0"));
	curr = 0;
	is_neg = 0;
	if (num < 0)
		is_neg = 1;
	res_size = ft_calc_digits(n, base) + 1 + is_neg;
	res = malloc(sizeof(char) * res_size);
	return (ntoa(num, base, res, res_size));
}