176 lines
3.9 KiB
C
176 lines
3.9 KiB
C
#include "precomp.h"
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//
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// COM.C
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// Common functions, simple
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//
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// Copyright(c) Microsoft 1997-
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//
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//
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// COM_BasedListInsertBefore(...)
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//
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// See com.h for description.
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//
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void COM_BasedListInsertBefore(PBASEDLIST pExisting, PBASEDLIST pNew)
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{
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PBASEDLIST pTemp;
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DebugEntry(COM_BasedListInsertBefore);
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//
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// Check for bad parameters.
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//
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ASSERT((pNew != NULL));
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ASSERT((pExisting != NULL));
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//
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// Find the item before pExisting:
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//
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pTemp = COM_BasedPrevListField(pExisting);
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ASSERT((pTemp != NULL));
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TRACE_OUT(("Inserting item at %#lx into list between %#lx and %#lx",
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pNew, pTemp, pExisting));
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//
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// Set its <next> field to point to the new item
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//
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pTemp->next = PTRBASE_TO_OFFSET(pNew, pTemp);
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pNew->prev = PTRBASE_TO_OFFSET(pTemp, pNew);
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//
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// Set <prev> field of pExisting to point to new item:
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//
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pExisting->prev = PTRBASE_TO_OFFSET(pNew, pExisting);
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pNew->next = PTRBASE_TO_OFFSET(pExisting, pNew);
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DebugExitVOID(COM_BasedListInsertBefore);
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} // COM_BasedListInsertBefore
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//
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// COM_BasedListInsertAfter(...)
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//
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// See com.h for description.
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//
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void COM_BasedListInsertAfter(PBASEDLIST pExisting, PBASEDLIST pNew)
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{
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PBASEDLIST pTemp;
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DebugEntry(COM_BasedListInsertAfter);
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//
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// Check for bad parameters.
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//
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ASSERT((pNew != NULL));
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ASSERT((pExisting != NULL));
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//
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// Find the item after pExisting:
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//
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pTemp = COM_BasedNextListField(pExisting);
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ASSERT((pTemp != NULL));
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TRACE_OUT(("Inserting item at %#lx into list between %#lx and %#lx",
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pNew, pExisting, pTemp));
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//
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// Set its <prev> field to point to the new item
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//
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pTemp->prev = PTRBASE_TO_OFFSET(pNew, pTemp);
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pNew->next = PTRBASE_TO_OFFSET(pTemp, pNew);
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//
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// Set <next> field of pExisting to point to new item:
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//
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pExisting->next = PTRBASE_TO_OFFSET(pNew, pExisting);
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pNew->prev = PTRBASE_TO_OFFSET(pExisting, pNew);
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DebugExitVOID(COM_BasedListInsertAfter);
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} // COM_BasedListInsertAfter
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//
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// COM_BasedListRemove(...)
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//
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// See com.h for description.
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//
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void COM_BasedListRemove(PBASEDLIST pListItem)
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{
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PBASEDLIST pNext = NULL;
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PBASEDLIST pPrev = NULL;
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DebugEntry(COM_BasedListRemove);
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//
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// Check for bad parameters.
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//
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ASSERT((pListItem != NULL));
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pPrev = COM_BasedPrevListField(pListItem);
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pNext = COM_BasedNextListField(pListItem);
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ASSERT((pPrev != NULL));
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ASSERT((pNext != NULL));
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TRACE_OUT(("Removing item at %#lx from list", pListItem));
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pPrev->next = PTRBASE_TO_OFFSET(pNext, pPrev);
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pNext->prev = PTRBASE_TO_OFFSET(pPrev, pNext);
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DebugExitVOID(COM_BasedListRemove);
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} // COM_BasedListRemove
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//
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//
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// List manipulation routines
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// COM_BasedListNext
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// COM_BasedListPrev
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// COM_BasedListFirst
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// COM_BasedListLast
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//
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//
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void FAR * COM_BasedListNext( PBASEDLIST pHead, void FAR * pEntry, UINT nOffset )
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{
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PBASEDLIST p;
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ASSERT(pHead != NULL);
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ASSERT(pEntry != NULL);
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p = COM_BasedNextListField(COM_BasedStructToField(pEntry, nOffset));
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return ((p == pHead) ? NULL : COM_BasedFieldToStruct(p, nOffset));
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}
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void FAR * COM_BasedListPrev ( PBASEDLIST pHead, void FAR * pEntry, UINT nOffset )
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{
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PBASEDLIST p;
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ASSERT(pHead != NULL);
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ASSERT(pEntry != NULL);
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p = COM_BasedPrevListField(COM_BasedStructToField(pEntry, nOffset));
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return ((p == pHead) ? NULL : COM_BasedFieldToStruct(p, nOffset));
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}
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void FAR * COM_BasedListFirst ( PBASEDLIST pHead, UINT nOffset )
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{
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return (COM_BasedListIsEmpty(pHead) ?
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NULL :
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COM_BasedFieldToStruct(COM_BasedNextListField(pHead), nOffset));
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}
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void FAR * COM_BasedListLast ( PBASEDLIST pHead, UINT nOffset )
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{
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return (COM_BasedListIsEmpty(pHead) ?
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NULL :
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COM_BasedFieldToStruct(COM_BasedPrevListField(pHead), nOffset));
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}
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