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149 lines
6.7 KiB
149 lines
6.7 KiB
/***************************************************************************/
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/* */
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/* Project: OpenSLP */
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/* */
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/* File: linkedlist.c */
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/* */
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/* Abstract: Functions to manipulate a simple linked list */
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/* */
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/*-------------------------------------------------------------------------*/
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/* */
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/* Please submit patches to http://www.openslp.org */
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/* */
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/*-------------------------------------------------------------------------*/
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/* */
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/* Copyright (C) 2000 Caldera Systems, Inc */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or without */
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/* modification, are permitted provided that the following conditions are */
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/* met: */
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/* */
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/* Redistributions of source code must retain the above copyright */
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/* notice, this list of conditions and the following disclaimer. */
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/* */
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/* Redistributions in binary form must reproduce the above copyright */
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/* notice, this list of conditions and the following disclaimer in */
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/* the documentation and/or other materials provided with the */
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/* distribution. */
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/* */
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/* Neither the name of Caldera Systems nor the names of its */
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/* contributors may be used to endorse or promote products derived */
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/* from this software without specific prior written permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
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/* `AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
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/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR */
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/* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE CALDERA */
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/* SYSTEMS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
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/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */
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/* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
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/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
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/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE */
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/* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/***************************************************************************/
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#include "slp_linkedlist.h"
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/*=========================================================================*/
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SLPListItem* SLPListUnlink(SLPList* list, SLPListItem* item)
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/* Unlinks the specified item from the specified list. */
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/* */
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/* list (IN) pointer to the list to unlink the item from */
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/* */
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/* item (IN) item to be removed from the list */
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/* */
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/* Returns pointer to the unlinked item */
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/*=========================================================================*/
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{
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if(item->previous)
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{
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item->previous->next = item->next;
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}
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if(item->next)
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{
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item->next->previous = item->previous;
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}
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if(item == list->head)
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{
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list->head = item->next;
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}
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if(item == list->tail)
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{
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list->tail = item->previous;
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}
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list->count = list->count - 1;
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return item;
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}
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/*=========================================================================*/
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SLPListItem* SLPListLinkHead(SLPList* list, SLPListItem* item)
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/* Links the specified item to the head of the specified list. */
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/* */
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/* list (IN) pointer to the list to link to */
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/* */
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/* item (IN) item to be linkedto the list */
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/* */
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/* Returns pointer to the linked item */
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/*=========================================================================*/
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{
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item->previous = 0;
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item->next = list->head;
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if(list->head)
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{
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list->head->previous = item;
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}
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list->head = item;
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if(list->tail == 0)
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{
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list->tail = item;
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}
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list->count = list->count + 1;
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return item;
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}
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/*=========================================================================*/
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SLPListItem* SLPListLinkTail(SLPList* list, SLPListItem* item)
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/* Links the specified item to the tail of the specified list. */
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/* */
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/* list (IN) pointer to the list to link to */
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/* */
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/* item (IN) item to be linkedto the list */
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/* */
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/* Returns pointer to the linked item */
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/*=========================================================================*/
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{
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item->previous = list->tail;
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item->next = 0;
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if(list->tail)
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{
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list->tail->next = item;
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}
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list->tail = item;
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if(list->head == 0)
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{
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list->head = item;
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}
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list->count = list->count + 1;
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return item;
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}
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