01-ft_printf/ft_printf.c at master · obult-codam/01-ft_printf · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        ::::::::            */
/*   ft_printf.c                                        :+:    :+:            */
/*                                                     +:+                    */
/*   By: oswin <oswin@student.codam.nl>               +#+                     */
/*                                                   +#+                      */
/*   Created: 2021/01/28 19:48:52 by oswin         #+#    #+#                 */
/*   Updated: 2021/02/19 11:40:54 by oswin         ########   odam.nl         */
/*                                                                            */
/* ************************************************************************** */

#include <unistd.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include "printf.h"

int		ft_printf(const char *format, ...)
{
	va_list		ap;
	int			count;
	int			tmp;

	count = 0;
	va_start(ap, format);
	while (rnw(&format, &count))
	{
		tmp = bspecial((char **)&format, &ap);
		format++;
		if (tmp >= 0)
		{
			count = count + tmp;
			while (!ft_included(*format, "cspdiuxX%"))
				format++;
			format++;
		}
		else
			count++;
	}
	return (count);
}

int		rnw(const char **format, int *count)
{
	int		i;

	i = 0;
	while ((*format)[i] && (*format)[i] != '%')
		i++;
	if (i)
	{
		write(1, *format, i);
		*format = *format + i;
		*count = *count + i;
	}
	return (**format);
}

int		bspecial(char **format, va_list *ap)
{
	int		i;

	i = 1;
	while (ft_included((*format)[i], "0123456789.*-"))
		i++;
	if (ft_included((*format)[i], "cspdiuxX"))
		return (wwcd(format, ap, (*format)[i]));
	else if ((*format)[i] == '%')
		return (ft_putc(ap, format, 1));
	ft_putchar('%');
	return (-1);
}

int		wwcd(char **format, va_list *ap, char c)
{
	if (c == 'c')
		return (ft_putc(ap, format, 0));
	if (c == 's')
		return (ft_puts(ap, format, "(null)"));
	if (c == 'p')
		return (ft_prep_ptr(ap, format));
	if (c == 'd' || c == 'i')
		return (ft_prepdi(ap, format));
	if (c == 'u')
		return (ft_uprep(ap, format, "0123456789"));
	if (c == 'x')
		return (ft_uprep(ap, format, "0123456789abcdef"));
	if (c == 'X')
		return (ft_uprep(ap, format, "0123456789ABCDEF"));
	return (0);
}