ft_ssl_md5/libs/libft/srcs/ft_itoa_base.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_itoa_base.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: bchanot <bchanot@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2018/10/12 03:26:09 by bchanot           #+#    #+#             */
/*   Updated: 2018/10/29 11:49:37 by bchanot          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	ft_ulen(t_uint64 value, t_uint8 base)
{
	int	i;

	i = 0;
	while (value / base)
		i++;
	return (i);
}

char		*ft_utoa_base(t_uint64 value, t_uint8 base)
{
	const char	hex[16] = "0123456789abcdef";
	char		*s;
	int			i;

	i = ft_ulen(value, base);
	s = ft_strnew(i);
	while (value / base)
	{
		s[i] = hex[value % base];
		value /= base;
		i--;
	}
	return (s);
}

static int	ft_len(t_int64 value, t_uint8 base)
{
	int	i;

	i = 0;
	while (value / base)
		i++;
	return (i);
}

char		*ft_itoa_base(t_int64 value, t_uint8 base)
{
	const char	hex[16] = "0123456789abcdef";
	char		*s;
	int			i;
	int			neg;

	neg = value < 0 && base == 10 ? 1 : 0;
	value = value < 0 ? -value : value;
	i = ft_len(value, base) + neg;
	s = ft_strnew(i);
	while (value / base)
	{
		s[i] = hex[value % base];
		value /= base;
		i--;
	}
	if (neg)
		s[i] = '-';
	return (s);
}