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

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_printf_int.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dporhomo <dporhomo@student.42prague.com    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/03 00:46:32 by dporhomo          #+#    #+#             */
/*   Updated: 2025/12/09 10:29:02 by dporhomo         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_printf.h"

static char	*ft_uitoa(unsigned int n);
static int	ft_format_out(char *str, t_layout *tab, t_flags f);
static int	ft_get_sign(int n, t_flags flags);
static int	ft_write_num(char *str, int len, int zeros, int sign);

int	ft_print_int(int n, t_flags flags)
{
	char		*str;
	long		nb;
	t_layout	tab;
	int			ret;

	nb = n;
	if (nb < 0)
		nb = -nb;
	if (n == 0 && flags.precision == 0)
		return (ft_print_padding(flags.width, 0, 0));
	str = ft_uitoa((unsigned int)nb);
	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 = ft_get_sign(n, flags);
	ret = ft_format_out(str, &tab, flags);
	free(str);
	return (ret);
}

static char	*ft_uitoa(unsigned int n)
{
	char			*str;
	int				len;
	unsigned int	num;

	num = n;
	len = 0;
	if (n == 0)
		len = 1;
	while (n > 0 || len == 0)
	{
		n /= 10;
		len++;
	}
	str = (char *)malloc(sizeof(char) * (len + 1));
	if (!str)
		return (NULL);
	str[len] = '\0';
	if (num == 0)
		str[0] = '0';
	while (num > 0)
	{
		str[--len] = (num % 10) + '0';
		num /= 10;
	}
	return (str);
}

static int	ft_format_out(char *str, t_layout *tab, t_flags f)
{
	int	total_len;
	int	count;

	count = 0;
	total_len = tab->len + tab->zeros + (tab->sign != 0);
	if (f.left == 0)
	{
		if (f.zero && f.precision == -1)
		{
			if (tab->sign)
				count += write(1, &tab->sign, 1);
			tab->sign = 0;
			count += ft_print_padding(f.width, total_len, 1);
		}
		else
			count += ft_print_padding(f.width, total_len, 0);
	}
	count += ft_write_num(str, tab->len, tab->zeros, tab->sign);
	if (f.left == 1)
		count += ft_print_padding(f.width, total_len, 0);
	return (count);
}

static int	ft_get_sign(int n, t_flags flags)
{
	if (n < 0)
		return ('-');
	if (flags.plus)
		return ('+');
	if (flags.space)
		return (' ');
	return (0);
}

static int	ft_write_num(char *str, int len, int zeros, int sign)
{
	int	count;

	count = 0;
	if (sign)
		count += write(1, &sign, 1);
	while (zeros-- > 0)
		count += write(1, "0", 1);
	count += write(1, str, len);
	return (count);
}