ft_printf/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"

#include "./libft/libft.h"

int handle_options(va_list args, const char *str, t_opts *opts)
{
    while (*str && !ft_strchr("cspdiuxX%", *str)) {
        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))
        {
            if (opts->dot) opts->precision = ft_atoi(str);
            else opts->width = ft_atoi(str);
            while (ft_isdigit(*str)) {
                str++;
                opts->len++;
            }
            continue;
        } else if (*str == '*')
        {
            if (opts->dot) opts->precision = va_arg(args, int);
            else opts->width = va_arg(args, int);
        } else return (0);
        str++;
        opts->len++;
    }
    return (1);
}

int handle_functions(va_list args, const char *str, t_opts *opts)
{
    size_t      n                                                              = 0;
    size_t      ret                                                            = 0;
    const char *g_types                                                        = {"cspdiuxX%"};
    static int (*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};
    while (g_types[n] && g_types[n] != *str)
        n++;
    if (g_types[n]) {
        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;
        ret += (g_printf_fcts[n])(args, str, opts);
    }
    return ret;
}

int ft_printf(const char *str, ...)
{
    va_list args;
    size_t  i;
    t_opts  opts;

    i = 0;
    va_start(args, str);
    while (*str)
    {
        if (*str == '%' && str++)
        {
            opts = (t_opts){0};
            if (handle_options(args, str, &opts))
            {
                str += opts.len;
                i += handle_functions(args, str, &opts);
            }
        }
        else if (++i)
            ft_putchar_fd(*str, 1);
        str++;
    }
    va_end(args);
    return (i);
}