libft/srcs/ft_itohex.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itohex.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: bchanot <bchanot@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2018/01/16 00:21:29 by bchanot           #+#    #+#             */
/*   Updated: 2018/01/16 00:34:09 by xuser            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static void	ft_itohex_loop(unsigned long nb, char **str, int depth)
{
	const char		*hex = "0123456789abcdef";
	unsigned long	index;

	index = nb % 16;
	if (nb / 16 > 0)
		ft_itohex_loop(nb / 16, str, (depth - 1));
	(*str)[depth] = hex[index];
}

char		*ft_itohex(unsigned long nb, int depth)
{
	char	*str;
	int		cpt;

	str = ft_strnew(depth + 1);
	cpt = 0;
	while (cpt <= depth)
		str[cpt++] = '0';
	ft_itohex_loop(nb, &str, depth);
	return (str);
}