/*
 * Copyright (c) 2011 Benjamin Franzke
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <stddef.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>

#include "libudev.h"

#include <unistd.h>

#include "wfdregistry.h"

static struct wfd_registry *wfd_registry = NULL;

static void
wfd_destroy(void)
{
	int i;

	if (wfd_registry->devices) {
		for (i = 0; i < wfd_registry->device_count; ++i)
			close(wfd_registry->devices[i].fd);
		free(wfd_registry->devices);
	}

	if (wfd_registry->udev) {
		udev_unref(wfd_registry->udev);
	}

	if (wfd_registry != NULL)
		free(wfd_registry);
}

static int
wfd_init(void)
{
	assert(wfd_registry == NULL);

	wfd_registry = calloc(1, sizeof *wfd_registry);
	if (wfd_registry == NULL)
		return -ENOMEM;

	wfd_registry->udev = udev_new();
	if (wfd_registry->udev == NULL) {
		free(wfd_registry);
		return -ENOMEM;
	}

	atexit(wfd_destroy);

	return 0;
}

struct wfd_registry *
wfd_get_registry(void)
{
	if (wfd_registry == NULL)
		wfd_init();

	return wfd_registry;
}