extract string typedefs to a shared file

Change-Id: I6e5d7c828f56b6a3f562ed8a9dd5f63a9d603ce0

onlineupdate/inc/types.hxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_ONLINEUPDATE_TYPES_HXX
+#define INCLUDED_ONLINEUPDATE_TYPES_HXX
+
+#include <string>
+
+#if defined(_WIN32)
+typedef std::wstring tstring;
+typedef WCHAR NS_tchar;
+#else
+typedef std::string tstring;
+typedef char NS_tchar;
+#endif
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

onlineupdate/source/update/common/readstrings.h

@@ -11,14 +11,9 @@
 
 #ifdef _WIN32
 # include <windows.h>
-typedef WCHAR NS_tchar;
-#else
-typedef char NS_tchar;
 #endif
 
-#ifndef NULL
-#define NULL 0
-#endif
+#include "types.hxx"
 
 struct StringTable
 {

onlineupdate/source/update/updater/archivereader.h

@@ -9,12 +9,7 @@
 
 #include <stdio.h>
 #include <onlineupdate/mar.h>
-
-#ifdef _WIN32
-typedef WCHAR NS_tchar;
-#else
-typedef char NS_tchar;
-#endif
+#include "types.hxx"
 
 // This class provides an API to extract files from an update archive.
 class ArchiveReader

onlineupdate/source/update/updater/progressui.h

@@ -8,12 +8,11 @@
 #define PROGRESSUI_H__
 
 #include "updatedefines.h"
+#include "types.hxx"
 
 #if defined(_WIN32)
-typedef WCHAR NS_tchar;
 #define NS_main wmain
 #else
-typedef char NS_tchar;
 #define NS_main main
 #endif