ft_printf/float.c at master · StToupin/ft_printf · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   float.c                                            :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: stoupin <marvin@42.fr>                     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2017/04/24 13:53:21 by stoupin           #+#    #+#             */
/*   Updated: 2017/04/24 14:05:52 by stoupin          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_printf.h"

static int		print_int(t_buf *buffer, long long int n,
										int ndigits, int printed)
{
	int		len;
	char	c;

	len = 0;
	if (n <= -10 || n >= 10 || printed < ndigits)
		len = print_int(buffer, n / 10, ndigits, printed + 1);
	if (n >= 0)
		c = '0' + (n % 10);
	else
		c = '0' - (n % 10);
	buf_putchar(buffer, c);
	return (len + 1);
}

static long int	ft_pow(int number, int power)
{
	long int	result;
	int			i;

	result = 1;
	i = 0;
	while (i < power)
	{
		result *= number;
		i++;
	}
	return (result);
}

static int		buf_print_float(t_buf *buffer, double n,
								int after_point, int no_print)
{
	long int	ipart;
	long int	ifpart;
	int			len;

	len = 0;
	ipart = (long int)n;
	len = ft_intlen(ipart, 10);
	if (!no_print)
		print_int(buffer, ipart, -1, 1);
	if (after_point != 0)
	{
		ifpart = (long int)(ft_pow(10, after_point) * (n - (double)ipart) + .5);
		len += 1 + after_point;
		if (!no_print)
		{
			buf_putchar(buffer, '.');
			print_int(buffer, ifpart, after_point, 1);
		}
	}
	return (len);
}

int				print_float(t_buf *buffer, double n,
							int after_point, int no_print)
{
	int		len;

	len = 0;
	if (n < 0)
	{
		n = -n;
		len++;
	}
	len += buf_print_float(buffer, n, after_point, no_print);
	return (len);
}