105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
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//
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// REGDVAL.C
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//
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// Copyright (C) Microsoft Corporation, 1995
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//
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// Implementation of RegDeleteValue and supporting functions.
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//
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#include "pch.h"
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//
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// RgDeleteValueRecord
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//
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// Deletes the specified VALUE_RECORD from the provided KEY_RECORD.
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//
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VOID
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INTERNAL
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RgDeleteValueRecord(
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LPKEY_RECORD lpKeyRecord,
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LPVALUE_RECORD lpValueRecord
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)
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{
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UINT ValueRecordLength;
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LPBYTE lpSource;
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UINT BytesToPushDown;
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ASSERT(lpKeyRecord-> ValueCount > 0);
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ValueRecordLength = sizeof(VALUE_RECORD) + lpValueRecord-> NameLength +
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lpValueRecord-> DataLength - 1;
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ASSERT(lpKeyRecord-> RecordSize >= ValueRecordLength);
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//
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// If this isn't the last value of this KEY_RECORD, then push down any
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// VALUE_RECORDs after the VALUE_RECORD to delete.
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//
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if (--lpKeyRecord-> ValueCount) {
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lpSource = (LPBYTE) lpValueRecord + ValueRecordLength;
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BytesToPushDown = (UINT) ((LPBYTE) lpKeyRecord + lpKeyRecord->
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RecordSize - lpSource);
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MoveMemory((LPBYTE) lpValueRecord, lpSource, BytesToPushDown);
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}
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lpKeyRecord-> RecordSize -= ValueRecordLength;
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}
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//
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// VMMRegDeleteValue
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//
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// See Win32 documentation of RegDeleteValue.
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//
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LONG
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REGAPI
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VMMRegDeleteValue(
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HKEY hKey,
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LPCSTR lpValueName
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)
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{
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int ErrorCode;
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LPKEY_RECORD lpKeyRecord;
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LPVALUE_RECORD lpValueRecord;
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if (IsBadOptionalStringPtr(lpValueName, (UINT) -1))
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return ERROR_INVALID_PARAMETER;
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if (!RgLockRegistry())
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return ERROR_LOCK_FAILED;
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if ((ErrorCode = RgValidateAndConvertKeyHandle(&hKey)) == ERROR_SUCCESS) {
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if ((ErrorCode = RgLookupValueByName(hKey, lpValueName, &lpKeyRecord,
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&lpValueRecord)) == ERROR_SUCCESS) {
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if ((hKey-> PredefinedKeyIndex == INDEX_DYN_DATA) || (hKey->
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lpFileInfo-> Flags & FI_READONLY))
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ErrorCode = ERROR_ACCESS_DENIED;
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else {
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RgDeleteValueRecord(lpKeyRecord, lpValueRecord);
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RgSignalWaitingNotifies(hKey-> lpFileInfo, hKey-> KeynodeIndex,
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REG_NOTIFY_CHANGE_LAST_SET);
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}
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RgUnlockDatablock(hKey-> lpFileInfo, hKey-> BlockIndex, TRUE);
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}
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}
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RgUnlockRegistry();
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return ErrorCode;
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}
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