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104 lines
2.4 KiB
C++
104 lines
2.4 KiB
C++
/************************************************************************
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*
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* Copyright (C) 2003-2004
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* Shenzhen SCADA Control Technology Co., Ltd.
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* All rights reserved.
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*
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* 实现双链表
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*
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* 创建日期: 2004/01/10
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*
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* $Id: list_entry.cpp,v 1.1.1.1 2006/07/05 07:31:43 jehu Exp $
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*
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***********************************************************************/
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#include <sys/types.h>
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#include "list_entry.h"
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/*
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* 双向链表的操纵例程函数的实现
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*/
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void Initialize_list_head ( list_entry_t * plist_head )
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{
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plist_head->flink = plist_head->blink = plist_head;
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}
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/*
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* 判断双向链表是否为空
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*
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* \retval 0 空链表
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* \retval 非0 空链表
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*/
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int is_list_empty ( list_entry_t * plist_head )
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{
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return (int)(plist_head->flink == plist_head);
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}
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/*
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* 从双向链表的头部移取一个链表元素--与链表脱离链接关系
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*/
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list_entry_t * remove_head_list ( list_entry_t * plist_head )
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{
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list_entry_t * pHeadEntry = plist_head->flink;
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remove_entry_list ( plist_head->flink );
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return pHeadEntry;
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}
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/*
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* 从双向链表的尾部移取一个链表元素--与链表脱离链接关系
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*/
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list_entry_t * remove_tail_list ( list_entry_t * plist_head )
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{
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list_entry_t * pHeadEntry = plist_head->blink;
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remove_entry_list ( plist_head->blink );
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return pHeadEntry;
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}
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/*
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* 从双向链表中移取制定的链表元素--与链表脱离链接关系
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*/
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void remove_entry_list ( list_entry_t * pEntry )
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{
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list_entry_t * _EX_Blink = (list_entry_t *)0;
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list_entry_t * _EX_Flink = (list_entry_t *)0;
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_EX_Flink = pEntry->flink;
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_EX_Blink = pEntry->blink;
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_EX_Blink->flink = _EX_Flink;
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_EX_Flink->blink = _EX_Blink;
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}
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/*
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* 将一个链表元素从尾部插入到双向链表中
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*/
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void insert_tail_list ( list_entry_t * plist_head, list_entry_t * pEntry )
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{
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list_entry_t * _EX_Blink = (list_entry_t *)0;
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list_entry_t * _EX_ListHead = (list_entry_t *)0;
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_EX_ListHead = plist_head;
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_EX_Blink = _EX_ListHead->blink;
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pEntry->flink = _EX_ListHead;
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pEntry->blink = _EX_Blink;
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_EX_Blink->flink = pEntry;
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_EX_ListHead->blink = pEntry;
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}
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/*
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* 将一个链表元素从尾部插入到双向链表中
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*/
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void insert_head_list ( list_entry_t * plist_head, list_entry_t * pEntry)
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{
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list_entry_t * _EX_Flink = (list_entry_t *)0;
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list_entry_t * _EX_ListHead = (list_entry_t *)0;
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_EX_ListHead = plist_head;
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_EX_Flink = _EX_ListHead->flink;
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pEntry->flink = _EX_Flink;
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pEntry->blink = _EX_ListHead;
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_EX_Flink->blink = pEntry;
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_EX_ListHead->flink = pEntry;
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}
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