398 lines
11 KiB
C++
398 lines
11 KiB
C++
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//+--------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1992.
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//
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// File: ulist.cxx
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//
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// Contents: CUpdateList implementation and support routines
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//
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// History: 15-Jan-92 DrewB Created
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//
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//---------------------------------------------------------------
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#include <dfhead.cxx>
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#pragma hdrstop
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//+--------------------------------------------------------------
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//
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// Member: CUpdate::CUpdate, public
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//
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// Synopsis: Constructor
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//
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// Arguments: [pdfnCurrentName] - Current name pointer
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// [pdfnOriginalName] - Original name pointer
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// [dlLUID] - LUID
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// [dwFlags] - Flags
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// [ptsm] - Entry object
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//
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// History: 15-Jan-92 DrewB Created
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//
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//---------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CUpdate_CUpdate)
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#endif
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CUpdate::CUpdate(CDfName const *pdfnCurrent,
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CDfName const *pdfnOriginal,
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DFLUID dlLUID,
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DWORD dwFlags,
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PTSetMember *ptsm)
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{
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SetCurrentName(pdfnCurrent);
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SetOriginalName(pdfnOriginal);
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_dl = dlLUID;
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_dwFlags = dwFlags;
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_ptsm = P_TO_BP(CBasedTSetMemberPtr, ptsm);
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_pudNext = _pudPrev = NULL;
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if (_ptsm)
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_ptsm->AddRef();
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CUpdate::~CUpdate, public
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//
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// Synopsis: Destructor
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//
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// History: 05-Nov-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CUpdate_1CUpdate) // inline?
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#endif
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CUpdate::~CUpdate(void)
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{
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if (_ptsm)
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_ptsm->Release();
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}
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//+--------------------------------------------------------------
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//
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// Member: CUpdateList::Add, public
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//
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// Synopsis: Adds an element to an update list
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//
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// Arguments: [pdfnCurrent] - Current name
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// [pdfnOriginal] - Original name
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// [dlLUID] - LUID
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// [dwFlags] - Flags
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// [ptsm] - Entry object
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//
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// Returns: The new element or NULL
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//
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// History: 15-Jan-92 DrewB Created
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//
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// Notes: Caller must handle NULL
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// Entries must be added in the list in the order of
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// Add calls
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//
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//---------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CUpdateList_Add)
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#endif
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CUpdate *CUpdateList::Add(IMalloc * const pMalloc,
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CDfName const *pdfnCurrent,
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CDfName const *pdfnOriginal,
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DFLUID dlLUID,
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DWORD dwFlags,
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PTSetMember *ptsm)
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{
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CUpdate *pudNew;
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olDebugOut((DEB_ITRACE, "In CUpdateList::Add:%p("
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"%ws, %ws, %ld, %lX, %p)\n", this, pdfnCurrent->GetBuffer(),
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pdfnOriginal->GetBuffer(), dlLUID, dwFlags, ptsm));
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olAssert((dlLUID != DF_NOLUID || pdfnOriginal != NULL) &&
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aMsg("Create update luid can't be DF_NOLUID"));
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pudNew = new (pMalloc) CUpdate(pdfnCurrent, pdfnOriginal, dlLUID,
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dwFlags, ptsm);
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if (pudNew)
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{
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Append(pudNew);
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}
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olDebugOut((DEB_ITRACE, "Out CUpdateList::Add => %p\n", pudNew));
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return pudNew;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CUpdateList::Append, public
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//
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// Synopsis: Appends an update to the list
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//
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// Arguments: [pud] - Update
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//
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// History: 25-Nov-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CUpdateList_Append)
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#endif
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void CUpdateList::Append(CUpdate *pud)
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{
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olDebugOut((DEB_ITRACE, "In CUpdateList::Append:%p(%p)\n", this, pud));
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if (_pudTail)
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_pudTail->SetNext(pud);
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else
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_pudHead = P_TO_BP(CBasedUpdatePtr, pud);
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pud->SetPrev(BP_TO_P(CUpdate *, _pudTail));
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pud->SetNext(NULL);
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_pudTail = P_TO_BP(CBasedUpdatePtr, pud);
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olDebugOut((DEB_ITRACE, "Out CUpdateList::Append\n"));
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CUpdateList::Remove, public
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//
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// Synopsis: Removes an element from the list
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//
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// Arguments: [pud] - Element to remove
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//
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// History: 25-Nov-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CUpdateList_Remove)
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#endif
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void CUpdateList::Remove(CUpdate *pud)
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{
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olDebugOut((DEB_ITRACE, "In CUpdateList::Remove:%p(%p)\n", this, pud));
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olAssert(pud != NULL);
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CUpdate *pudNext = pud->GetNext();
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CUpdate *pudPrev = pud->GetPrev();
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if (pud->GetNext())
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pudNext->SetPrev(pudPrev);
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if (pud->GetPrev())
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pudPrev->SetNext(pudNext);
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if (pud == _pudHead)
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_pudHead = P_TO_BP(CBasedUpdatePtr, pudNext);
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if (pud == _pudTail)
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_pudTail = P_TO_BP(CBasedUpdatePtr, pudPrev);
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pud->SetNext(NULL);
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pud->SetPrev(NULL);
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olDebugOut((DEB_ITRACE, "Out CUpdateList::Remove\n"));
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}
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//+--------------------------------------------------------------
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//
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// Member: CUpdateList::Empty, public
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//
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// Synopsis: Frees all elements in an update list
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//
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// History: 06-Jan-92 DrewB Created
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//
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//---------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CUpdateList_Empty)
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#endif
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void CUpdateList::Empty(void)
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{
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CUpdate *pudTmp;
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olDebugOut((DEB_ITRACE, "In CUpdateList::Empty()\n"));
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while (_pudHead)
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{
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pudTmp = _pudHead->GetNext();
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delete BP_TO_P(CUpdate *, _pudHead);
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_pudHead = P_TO_BP(CBasedUpdatePtr, pudTmp);
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}
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_pudTail = NULL;
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olDebugOut((DEB_ITRACE, "Out CUpdateList::Empty\n"));
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CUpdateList::IsEntry, public
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//
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// Synopsis: Checks the update list to see if the given name represents
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// and existing entry in the list
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//
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// Arguments: [pdfn] - Name
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// [ppud] - Update entry return or NULL
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//
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// Returns: UIE_CURRENT - Found as a current name
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// UIE_ORIGINAL - Found as an original name
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// UIE_NOTFOUND
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//
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// Modifies: [ppud]
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//
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// History: 02-Nov-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CUpdateList_IsEntry)
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#endif
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UlIsEntry CUpdateList::IsEntry(CDfName const *pdfn, CUpdate **ppud)
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{
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CUpdate *pud;
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UlIsEntry ret = UIE_NOTFOUND;
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olDebugOut((DEB_ITRACE, "In CUpdateList::IsEntry:%p(%ws, %p)\n", this,
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pdfn->GetBuffer(), ppud));
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olAssert(pdfn != NULL && pdfn->GetLength() > 0);
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for (pud = BP_TO_P(CUpdate *, _pudTail); pud; pud = pud->GetPrev())
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{
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if (pdfn->IsEqual(pud->GetCurrentName()))
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{
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ret = UIE_CURRENT;
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break;
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}
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else if (pdfn->IsEqual(pud->GetOriginalName()))
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{
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ret = UIE_ORIGINAL;
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break;
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}
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}
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olDebugOut((DEB_ITRACE, "Out CUpdateList::IsEntry\n"));
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if (ppud)
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*ppud = pud;
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return ret;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CUpdateList::Concat, public
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//
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// Synopsis: Concatenates an update list onto the end of this one
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//
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// Arguments: [ul] - List to concatenate
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//
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// History: 02-Nov-92 DrewB Created
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//
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// Notes: [ul]'s head may be modified
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//
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//+---------------------------------------------------------------------------
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#ifdef FUTURECODE
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void CUpdateList::Concat(CUpdateList &ul)
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{
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olDebugOut((DEB_ITRACE, "In CUpdateList::Concat:%p(ul)\n", this));
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if (_pudTail)
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{
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_pudTail->SetNext(ul.GetHead());
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if (ul.GetHead())
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{
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ul.GetHead()->SetPrev(_pudTail);
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olAssert(ul.GetTail() != NULL);
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_pudTail = ul.GetTail();
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}
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}
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else
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{
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olAssert(_pudHead == NULL);
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_pudHead = ul.GetHead();
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_pudTail = ul.GetTail();
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}
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olDebugOut((DEB_ITRACE, "Out CUpdateList::Concat\n"));
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}
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#endif
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//+---------------------------------------------------------------------------
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//
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// Member: CUpdateList::Exists, public static
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//
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// Synopsis: Traverses an update list from a particular point
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// and determines whether a given name exists or
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// is renamed
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//
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// Arguments: [pud] - Update to look from
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// [ppdfn] - Name in/out
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// [fRename] - Perform renames or quit
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//
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// Returns: TRUE if exists
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// FALSE if deleted
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//
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// History: 03-Nov-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifdef FUTURECODE
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BOOL CUpdateList::Exists(CUpdate *pud,
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CDfName **ppdfn,
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BOOL fRename)
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{
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for (; pud; pud = pud->GetNext())
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{
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if (pud->IsRename() &&
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(*ppdfn)->IsEqual(pud->GetOriginalName()))
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{
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if (fRename)
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*ppdfn = pud->GetCurrentName();
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else
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return FALSE;
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}
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else if (pud->IsDelete() &&
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(*ppdfn)->IsEqual(pud->GetOriginalName()))
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{
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return FALSE;
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}
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}
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return TRUE;
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}
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#endif
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//+---------------------------------------------------------------------------
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//
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// Member: CUpdateList::FindBase, public static
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//
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// Synopsis: Searches backwards in an update list for the creation of
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// a particular object, applying renames if necessary
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//
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// Arguments: [pud] - Update to start from
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// [ppdfn] - Name in/out
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//
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// Returns: Pointer to update entry for creation or NULL if
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// no creation entry. [ppdfn] is changed to point to
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// the base name.
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//
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// Modifies: [ppdfn]
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//
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// History: 16-Apr-93 DrewB Created
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//
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// Notes: Does not kill the search on deletions; primarily
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// intended to be used with names that represent existing
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// entries, although it will work on any name
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//
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//----------------------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CUpdateList_FindBase)
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#endif
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CUpdate *CUpdateList::FindBase(CUpdate *pud, CDfName const **ppdfn)
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{
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for (; pud; pud = pud->GetPrev())
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{
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if (pud->IsRename() &&
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(*ppdfn)->IsEqual(pud->GetCurrentName()))
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{
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*ppdfn = pud->GetOriginalName();
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}
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else if (pud->IsCreate() &&
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(*ppdfn)->IsEqual(pud->GetCurrentName()))
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{
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return pud;
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}
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}
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return NULL;
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}
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