ft_printf/libftprintf/ft_ltoa_base.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_ltoa_base.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gbaconni <gbaconni@42lausanne.ch>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/08/16 13:51:16 by gbaconni          #+#    #+#             */
/*   Updated: 2022/04/29 23:39:15 by gbaconni         ###   lausanne.ch       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_printf.h"

static long long	ft_ltoa_base_len(long long n, long long nbase);

char	*ft_ltoa_base(long n, char *base)
{
	char		*s;
	long long	i;
	long long	nbr;
	long long	nbase;

	nbase = ft_strlen(base);
	s = (char *) ft_calloc(ft_ltoa_base_len(n, nbase) + 1, sizeof(char));
	if (s == NULL)
		return (NULL);
	i = 0;
	nbr = n;
	if (nbr == 0)
		s[i++] = '0';
	if (nbr < 0)
		nbr = -nbr;
	while (nbr > 0)
	{
		s[i++] = base[nbr % nbase];
		nbr /= nbase;
	}
	if (n < 0)
		s[i++] = '-';
	s[i] = '\0';
	return (ft_strrev(s));
}

static long long	ft_ltoa_base_len(long long n, long long nbase)
{
	long long	len;

	len = 0;
	if (n < 0 || n == 0)
		len++;
	while (!(n < 1 && n > -1))
	{
		n /= nbase;
		len++;
	}
	return (len);
}