Printf/ft_printf_hex.c at main · codebit-hub/Printf · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_printf_hex.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dporhomo <dporhomo@student.42prague.com    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/03 22:33:50 by dporhomo          #+#    #+#             */
/*   Updated: 2025/12/09 10:27:03 by dporhomo         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_printf.h"

static char	*ft_xtoa(unsigned int n, int is_upper);
static void	ft_xtoa_str(char *str, int len, long num, char *base);
static int	ft_format_hex(char *s, t_layout *tab, t_flags f, int up);
static int	ft_write_prefix(int is_upper);

int	ft_print_hex(unsigned int n, int is_upper, t_flags flags)
{
	char		*str;
	int			count;
	t_layout	tab;

	if (n == 0 && flags.precision == 0)
		return (ft_print_padding(flags.width, 0, 0));
	str = ft_xtoa(n, is_upper);
	if (!str)
		return (0);
	tab.len = ft_strlen(str);
	tab.zeros = 0;
	if (flags.precision > tab.len)
		tab.zeros = flags.precision - tab.len;
	tab.sign = (flags.hash && n != 0);
	count = ft_format_hex(str, &tab, flags, is_upper);
	free(str);
	return (count);
}

static char	*ft_xtoa(unsigned int n, int is_upper)
{
	char	*str;
	int		len;
	long	num;
	char	*base;

	if (is_upper)
		base = "0123456789ABCDEF";
	else
		base = "0123456789abcdef";
	num = n;
	if (n == 0)
		len = 1;
	len = 0;
	while (n > 0 || len == 0)
	{
		n /= 16;
		len++;
	}
	str = (char *)malloc(sizeof(char) * (len + 1));
	if (!str)
		return (NULL);
	ft_xtoa_str(str, len, num, base);
	return (str);
}

static void	ft_xtoa_str(char *str, int len, long num, char *base)
{
	str[len] = '\0';
	if (num == 0)
		str[0] = '0';
	while (num > 0)
	{
		str[--len] = base[num % 16];
		num /= 16;
	}
}

static int	ft_format_hex(char *s, t_layout *tab, t_flags f, int up)
{
	int	count;
	int	total;

	count = 0;
	total = tab->len + tab->zeros + (tab->sign * 2);
	if (f.left == 0)
	{
		if (f.zero && f.precision == -1)
		{
			if (tab->sign)
				count += ft_write_prefix(up);
			tab->sign = 0;
			count += ft_print_padding(f.width, total, 1);
		}
		else
			count += ft_print_padding(f.width, total, 0);
	}
	if (tab->sign)
		count += ft_write_prefix(up);
	while (tab->zeros-- > 0)
		count += write(1, "0", 1);
	count += write(1, s, tab->len);
	if (f.left == 1)
		count += ft_print_padding(f.width, total, 0);
	return (count);
}

static int	ft_write_prefix(int is_upper)
{
	if (is_upper)
		return (write(1, "0X", 2));
	return (write(1, "0x", 2));
}