/*
 * File      : list.h
 * This file is part of RT-Thread GUI Engine
 * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2009-10-16     Bernard      first version
 */
#ifndef __RTGUI_LIST_H__
#define __RTGUI_LIST_H__

#include <rtgui/rtgui.h>

struct rtgui_list_node
{
    struct rtgui_list_node *next;
};
typedef struct rtgui_list_node rtgui_list_t;

rt_inline void rtgui_list_init(rtgui_list_t *l)
{
    l->next = (struct rtgui_list_node *)0;
}

rt_inline void rtgui_list_append(rtgui_list_t *l, rtgui_list_t *n)
{
    struct rtgui_list_node *node;

    node = l;
    while (node->next) node = node->next;

    /* append the node to the tail */
    node->next = n;
    n->next = (struct rtgui_list_node *) 0;
}

rt_inline void rtgui_list_insert(rtgui_list_t *l, rtgui_list_t *n)
{
    n->next = l->next;
    l->next = n;
}

rt_inline rtgui_list_t *rtgui_list_remove(rtgui_list_t *l, rtgui_list_t *n)
{
    /* remove slist head */
    struct rtgui_list_node *node = l;
    while (node->next && node->next != n) node = node->next;

    /* remove node */
    if (node->next != (rtgui_list_t *)0) node->next = node->next->next;

    return l;
}

#define rtgui_list_entry(node, type, member)    \
    ((type *)((char*)(node)-(unsigned long)(&((type *)0)->member)))

#define rtgui_list_foreach(node, list)  \
    for ((node) = (list)->next; (node) != RT_NULL; (node) = (node)->next)

#endif