flags.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   flags.c                                            :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rklein <rklein@student.hive.fi>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/06/05 12:38:15 by rklein            #+#    #+#             */
/*   Updated: 2020/06/05 12:41:03 by rklein           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_ls.h"

/*
** Functions that takes the input parameters and create a struct
** with a _Bool variable for each option flag. In this project only
** -Ralrt are handled, anything is else is conidered an illegal
** option, and gives error and usage messages.
*/

static int	ft_noflag(char c)
{
	write(1, "ft_ls: illegal option -- ", 25);
	write(1, &c, 1);
	write(1, "\nusage: ft_ls [-Ralrt] [file ...]\n", 34);
	return (-1);
}

static int	ft_isflag(char c, char *ref)
{
	while (*ref)
	{
		if (c == *ref)
			return (1);
		ref++;
	}
	return (0);
}

static void	ft_options(char c, t_flag *flags)
{
	if (c == 'a')
		flags->a = 1;
	if (c == 'l')
		flags->l = 1;
	if (c == 'r')
		flags->r = 1;
	if (c == 'R')
		flags->rr = 1;
	if (c == 't')
		flags->t = 1;
}

int			ft_flags(int ac, char **av, t_flag *flags)
{
	int	i;
	int	j;

	i = 1;
	while (i < ac && av[i][0] == '-' && av[i][1])
	{
		if (av[i][1] == '-' && !av[i][2])
			return (i + 1);
		j = 0;
		while (av[i][++j])
		{
			if (!ft_isflag(av[i][j], "alrRt"))
				return (ft_noflag(av[i][j]));
			ft_options(av[i][j], flags);
		}
		i++;
	}
	return (i);
}