42_ft_printf/ft_ptoa.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_ptoa.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/06 17:41:04 by cchauvet          #+#    #+#             */
/*   Updated: 2022/10/10 15:54:00 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "printf.h"

char	*ft_ptoa(void *ptr)
{
	unsigned long	address;
	size_t			i;
	char			*out;
	char			*s;

	if (ptr == NULL)
		return (ft_strdup("(nil)"));
	address = (unsigned long) ptr;
	s = ft_ultoabase(address, "0123456789abcdef");
	out = malloc((ft_strlen(s) + 2) * sizeof(char *));
	out[ft_strlen(s) + 2] = 0;
	out[0] = '0';
	out[1] = 'x';
	i = 0;
	while (s[i] != 0)
	{
		out[i + 2] = s[i];
		i++;
	}
	return (out);
}