ft_printf/srcs/ft_printf.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_printf.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: narnaud <narnaud@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/10/27 08:09:49 by narnaud           #+#    #+#             */
/*   Updated: 2021/11/17 09:40:16 by narnaud          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_printf.h"

void	get_digit(t_opts *opts, int n)
{
	if (opts->dot)
		opts->precision = n;
	else
		opts->width = n;
}

const char	*handle_options(va_list args, const char *str, t_opts *opts)
{
	if (*str == '-')
		opts->minus = 1;
	else if (*str == '0')
		opts->zero = 1;
	else if (*str == '#')
		opts->hash = 1;
	else if (*str == ' ')
		opts->space = 1;
	else if (*str == '+')
		opts->plus = 1;
	else if (*str == '.')
		opts->dot = 1;
	else if (ft_isdigit(*str))
	{
		get_digit(opts, ft_atoi(str));
		while (ft_isdigit(*str) && str++)
			opts->len++;
		return (str);
	}
	else if (*str == '*')
		get_digit(opts, va_arg(args, int));
	else
		return (str);
	opts->len++;
	return (++str);
}

void handle_functions(va_list args, const char *str, t_opts *opts)
{
	size_t		n;
	const char	*g_types = {"cspdiuxX%"};
	static void(*g_printf_fcts[9])(va_list arg, const char *str,
			t_opts *opts) = {va_print_char, va_print_str, va_print_ptr,
		va_print_nbr, va_print_nbr, va_print_unsign, va_print_x,
		va_print_x_cap, va_print_perc};

	n = 0;
	while (g_types[n] && g_types[n] != *str && ++n)
		;
	if (!g_types[n])
		return ;
	if (opts->minus)
		opts->zero = 0;
	if (opts->precision > 0)
		opts->zero = 0;
	if (opts->width < 0)
	{
		opts->minus = 1;
		opts->width *= -1;
	}
	if (opts->precision < 0)
		opts->dot = 0;
	(g_printf_fcts[n])(args, str, opts);
}

void ft_format(const char *format, va_list	args)
{
	t_opts	opts;

	while (*format)
	{
		if (*format == '%' && format++)
		{
			opts = (t_opts){0};
			while (*format && !ft_strchr("cspdiuxX%", *format))
				format = handle_options(args, format, &opts);
            handle_functions(args, format, &opts);
		}
		else
            add_string(ft_strnew(1, *format), 1);
		format++;
	}
}

int	ft_printf(const char *format, ...)
{
    int ret;
    t_dlist *strings;
    va_list	args;

	va_start(args, format);
    ft_format(format, args);
	ret = 0;
    strings = get_first();
    while (strings)
    {
        ret += strings->size;
            ft_putnstr_fd(strings->size, strings->content, 1);
        strings = strings->next;
    }
    clean_list();
	va_end(args);
	return (ret);
}

int	ft_fprintf(FILE *file, const char *format, ...)
{
    int ret;
    t_dlist *strings;
    va_list	args;

	va_start(args, format);
    ft_format(format, args);
	ret = 0;
    strings = get_first();
    while (strings)
    {
        ret += strings->size;
            fwrite(strings->content, sizeof(char), strings->size, file);
        strings = strings->next;
    }
    clean_list();
	va_end(args);
	return (ret);
}

int	ft_sprintf(char *str, const char *format, ...)
{
    int ret;
    t_dlist *strings;
    va_list	args;

	va_start(args, format);
    ft_format(format, args);
	ret = 0;
    strings = get_first();
    while (strings)
    {
        ret += strings->size;
        ft_strlcat(str, strings->content, ret);
        strings = strings->next;
    }
    clean_list();
    va_end(args);
	return (ret);
}