iec103/list_entry.cpp

/************************************************************************
 *
 *	Copyright (C) 2003-2004
 *	Shenzhen SCADA Control Technology Co., Ltd.
 *	All rights reserved.
 *	
 *	ʵ<EFBFBD><EFBFBD>˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 *
 *	<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:	2004/01/10
 *
 *	$Id: list_entry.cpp,v 1.1.1.1 2006/07/05 07:31:43 jehu Exp $
 *
 ***********************************************************************/

#include <sys/types.h>

#include "list_entry.h"

/*
 *	˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̺<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD><EFBFBD>
 */
void Initialize_list_head ( list_entry_t * plist_head ) 
{
	plist_head->flink = plist_head->blink = plist_head;
}

/*
 *	<EFBFBD>ж<EFBFBD>˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD>Ϊ<EFBFBD><EFBFBD>
 *	
 *	\retval 0    <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 *	\retval <EFBFBD><EFBFBD>0  <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 */
int is_list_empty ( list_entry_t * plist_head )
{
	return (int)(plist_head->flink == plist_head);
}

/*
 *	<EFBFBD><EFBFBD>˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD>--<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӹ<EFBFBD>ϵ
 */
list_entry_t * remove_head_list ( list_entry_t * plist_head )
{
	list_entry_t * pHeadEntry = plist_head->flink;
	remove_entry_list ( plist_head->flink );
	return pHeadEntry;
}


/*
 *	<EFBFBD><EFBFBD>˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>β<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD>--<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӹ<EFBFBD>ϵ
 */
list_entry_t * remove_tail_list ( list_entry_t * plist_head )
{
	list_entry_t * pHeadEntry = plist_head->blink;
	remove_entry_list ( plist_head->blink );
	return pHeadEntry;
}

/*
 *	<EFBFBD><EFBFBD>˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>ƶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD><EFBFBD>--<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӹ<EFBFBD>ϵ
 */
void remove_entry_list ( list_entry_t * pEntry )
{
    list_entry_t * _EX_Blink = (list_entry_t *)0;
    list_entry_t * _EX_Flink = (list_entry_t *)0;
    
	_EX_Flink = pEntry->flink;
    _EX_Blink = pEntry->blink;
    _EX_Blink->flink = _EX_Flink;
    _EX_Flink->blink = _EX_Blink;
}

/*
 *	<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>ش<EFBFBD>β<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>뵽˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 */
void insert_tail_list ( list_entry_t * plist_head, list_entry_t * pEntry ) 
{
    list_entry_t * _EX_Blink = (list_entry_t *)0;
    list_entry_t * _EX_ListHead = (list_entry_t *)0;

    _EX_ListHead = plist_head;
    _EX_Blink = _EX_ListHead->blink;
    pEntry->flink = _EX_ListHead;
    pEntry->blink = _EX_Blink;
    _EX_Blink->flink = pEntry;
    _EX_ListHead->blink = pEntry;
 }

/*
 *	<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>ش<EFBFBD>β<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>뵽˫<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 */
void insert_head_list ( list_entry_t * plist_head, list_entry_t * pEntry)
{
    list_entry_t * _EX_Flink = (list_entry_t *)0;
    list_entry_t * _EX_ListHead = (list_entry_t *)0;

    _EX_ListHead = plist_head;
    _EX_Flink = _EX_ListHead->flink;
    pEntry->flink = _EX_Flink;
    pEntry->blink = _EX_ListHead;
    _EX_Flink->blink = pEntry;
    _EX_ListHead->flink = pEntry;
}