ft_printf/ft_printf.c at master · ikodo0/ft_printf · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_printf.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dchernyk <dchernyk@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/05/03 20:49:21 by dchernyk          #+#    #+#             */
/*   Updated: 2026/05/04 14:47:27 by dchernyk         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_printf.h"

static int	ft_charorstr(int charorstr, ...)
{
	int		i;
	char	*str;
	va_list	args;

	i = 0;
	va_start(args, charorstr);
	if (charorstr == 0)
	{
		i = (unsigned char)va_arg(args, int);
		write(1, (char *)&i, 1);
		return (1);
	}
	else
	{
		str = va_arg(args, char *);
		if (str == NULL)
			return (ft_charorstr(1, "(null)"));
		while (str[i])
			ft_charorstr(0, str[i++]);
		va_end(args);
		return (i);
	}
}

static	int	put_num(int n)
{
	int			bytes_counter;
	long int	nb;

	nb = n;
	bytes_counter = 0;
	if (nb < 0)
		bytes_counter += ft_charorstr(0, '-');
	if (nb < 0)
		nb = -nb;
	if (nb >= 10)
	{
		bytes_counter += put_num((nb / 10));
		bytes_counter += put_num((nb % 10));
		return (bytes_counter);
	}
	else
	{
		if (nb < 10)
			bytes_counter += ft_charorstr(0, nb + '0');
	}
	return (bytes_counter);
}

static	int	put_hex(unsigned long int n, int hexcase)
{
	int				bytes_counter;
	unsigned int	base;

	base = 16;
	if (hexcase == 0)
		base = 10;
	bytes_counter = 0;
	if (n >= base)
	{
		bytes_counter += put_hex((n / base), hexcase);
		bytes_counter += put_hex((n % base), hexcase);
		return (bytes_counter);
	}
	else
	{
		if (n < 10)
			bytes_counter += ft_charorstr(0, (n + '0'));
		else if (hexcase == 1)
			bytes_counter += ft_charorstr(0, ((n - 10) + 'a'));
		else if (hexcase == 2)
			bytes_counter += ft_charorstr(0, ((n - 10) + 'A'));
	}
	return (bytes_counter);
}

static int	switch_type(char c, va_list *args)
{
	unsigned long int	arg;

	if (c == 'c')
		return (ft_charorstr(0, va_arg(*args, int)));
	else if (c == 's')
		return (ft_charorstr(1, va_arg(*args, char *)));
	else if (c == 'p')
	{
		arg = va_arg(*args, unsigned long int);
		if (!arg)
			return (ft_charorstr(1, "(nil)"));
		return (ft_charorstr(1, "0x") + put_hex(arg, 1));
	}
	else if (c == 'd' || c == 'i')
		return (put_num(va_arg(*args, int)));
	else if (c == 'u')
		return (put_hex(va_arg(*args, unsigned int), 0));
	else if (c == 'x')
		return (put_hex(va_arg(*args, unsigned int), 1));
	else if (c == 'X')
		return (put_hex(va_arg(*args, unsigned int), 2));
	else if (c == '%')
		return (ft_charorstr(0, '%'));
	return (0);
}

int	ft_printf(const char *format, ...)
{
	va_list	args;
	int		bytes_counter;

	bytes_counter = 0;
	va_start(args, format);
	while (*format)
	{
		if (*format == '%' && *(format + 1) != '\0')
		{
			format++;
			bytes_counter += switch_type(*format, &args);
		}
		else
			bytes_counter += ft_charorstr(0, *format);
		format++;
	}
	va_end(args);
	return (bytes_counter);
}

//#include <stdio.h>
//int main(void)
//{
//	printf(" %p %p \n", NULL, NULL);
//	ft_printf(" %p %p ", NULL, NULL);
//	return (0);
//}