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#pragma once
// SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
// SPDX-FileCopyrightText: 2015 ownCloud GmbH
// SPDX-License-Identifier: LGPL-2.1-or-later
#include <windows.h>
#include <stdio.h>
#include <strsafe.h>
// Stolen from the "Deleting a Key with Subkeys" example to replace
// RegDeleteTree which isn't available on WinXP.
// https://msdn.microsoft.com/en-us/library/ms724235(VS.85).aspx
//*************************************************************
//
// RegDelnodeRecurse()
//
// Purpose: Deletes a registry key and all its subkeys / values.
//
// Parameters: hKeyRoot - Root key
// lpSubKey - SubKey to delete
//
// Return: TRUE if successful.
// FALSE if an error occurs.
//
//*************************************************************
HRESULT RegDelnodeRecurse(HKEY hKeyRoot, LPTSTR lpSubKey)
{
LPTSTR lpEnd;
LONG lResult;
DWORD dwSize;
TCHAR szName[MAX_PATH];
HKEY hKey;
FILETIME ftWrite;
// First, see if we can delete the key without having
// to recurse.
lResult = RegDeleteKey(hKeyRoot, lpSubKey);
if (lResult == ERROR_SUCCESS)
return lResult;
lResult = RegOpenKeyEx(hKeyRoot, lpSubKey, 0, KEY_READ, &hKey);
if (lResult != ERROR_SUCCESS)
return lResult;
// Check for an ending slash and add one if it is missing.
lpEnd = lpSubKey + lstrlen(lpSubKey);
if (*(lpEnd - 1) != TEXT('\\'))
{
*lpEnd = TEXT('\\');
lpEnd++;
*lpEnd = TEXT('\0');
}
// Enumerate the keys
dwSize = MAX_PATH;
lResult = RegEnumKeyEx(hKey, 0, szName, &dwSize, nullptr,
nullptr, nullptr, &ftWrite);
if (lResult == ERROR_SUCCESS)
{
do {
StringCchCopy(lpEnd, MAX_PATH * 2, szName);
if (RegDelnodeRecurse(hKeyRoot, lpSubKey) != ERROR_SUCCESS) {
break;
}
dwSize = MAX_PATH;
lResult = RegEnumKeyEx(hKey, 0, szName, &dwSize, nullptr,
nullptr, nullptr, &ftWrite);
} while (lResult == ERROR_SUCCESS);
}
lpEnd--;
*lpEnd = TEXT('\0');
RegCloseKey(hKey);
// Try again to delete the key.
lResult = RegDeleteKey(hKeyRoot, lpSubKey);
return lResult;
}
//*************************************************************
//
// RegDelnode()
//
// Purpose: Deletes a registry key and all its subkeys / values.
//
// Parameters: hKeyRoot - Root key
// lpSubKey - SubKey to delete
//
// Return: TRUE if successful.
// FALSE if an error occurs.
//
//*************************************************************
HRESULT RegDelnode(HKEY hKeyRoot, LPTSTR lpSubKey)
{
TCHAR szDelKey[MAX_PATH * 2];
StringCchCopy(szDelKey, MAX_PATH * 2, lpSubKey);
return RegDelnodeRecurse(hKeyRoot, szDelKey);
}
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