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220 lines
3.2 KiB
220 lines
3.2 KiB
/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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list.c
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Abstract:
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List Entry manipulation functions
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Author:
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Based on code by Mike Tsang (MikeTs)
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Stephane Plante (Splante)
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Environment:
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User mode only
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Revision History:
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--*/
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#include "pch.h"
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VOID
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EXPORT
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ListRemoveEntry(
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PLIST List,
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PPLIST ListHead
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)
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/*++
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Routine Description:
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Remove an Entry from the list
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Arguments:
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List - Entry to be removed
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ListHead - List to be removed from
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Return Value:
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None
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--*/
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{
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ASSERT(ListHead);
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ASSERT(List != NULL);
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if (List->plistNext == List) {
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//
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// This is the only object in the list, it must be the head too.
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//
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ASSERT(List == *ListHead);
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*ListHead = NULL;
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} else {
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if (List == *ListHead) {
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//
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// The entry is at the head, so the next one becomes the new
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// head.
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//
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*ListHead = (*ListHead)->plistNext;
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}
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List->plistNext->plistPrev = List->plistPrev;
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List->plistPrev->plistNext = List->plistNext;
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}
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}
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PLIST
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EXPORT
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ListRemoveHead(
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PPLIST ListHead
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)
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/*++
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Routine Description:
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Remove the head entry of the list
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Arguments:
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ListHead - List to remove entry from
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Return Value:
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PLIST - Removed Item
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--*/
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{
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PLIST list;
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list = *ListHead;
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if ( list != NULL) {
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ListRemoveEntry(list, ListHead);
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}
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return list;
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}
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PLIST
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EXPORT
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ListRemoveTail(
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PPLIST ListHead
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)
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/*++
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Routine Description:
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Remove the tail entry from the list
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Arguments:
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ListHead - List to remove entry from
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Return Value:
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PLIST - Removed Item
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--*/
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{
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PLIST list;
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if (*ListHead == NULL) {
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list = NULL;
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} else {
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//
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// List is not empty, so find the tail.
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//
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list = (*ListHead)->plistPrev;
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ListRemoveEntry(list, ListHead);
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}
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return list;
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}
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VOID
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EXPORT
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ListInsertHead(
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PLIST List,
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PPLIST ListHead
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)
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/*++
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Routine Description:
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Insert an Entry at the head of the list
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Arguments:
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List List object to be inserted
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ListHead The list where to insert the object
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Return Value:
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None
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--*/
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{
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ListInsertTail(List, ListHead);
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*ListHead = List;
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}
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VOID
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EXPORT
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ListInsertTail(
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PLIST List,
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PPLIST ListHead
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)
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/*++
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Routine Description:
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Insert an Entry at the tail of the list
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Arguments:
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List List object to be inserted
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ListHead The list where to insert the object
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Return Value:
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None
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--*/
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{
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if (*ListHead == NULL) {
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//
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// List is empty, so this becomes the head.
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//
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*ListHead = List;
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List->plistPrev = List->plistNext = List;
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} else {
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List->plistNext = *ListHead;
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List->plistPrev = (*ListHead)->plistPrev;
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(*ListHead)->plistPrev->plistNext = List;
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(*ListHead)->plistPrev = List;
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}
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}
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