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/* $Id: RTTimeZoneGetCurrent-win.cpp $ */
/** @file
* IPRT - RTTimeZoneGetCurrent, generic.
*/
/*
* Copyright (C) 2017-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/time.h>
#include "internal/iprt.h"
#include <iprt/errcore.h>
#include <iprt/env.h>
#include <iprt/string.h>
#include <iprt/utf16.h>
#include <iprt/win/windows.h>
#include "internal-r3-win.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
typedef DWORD (WINAPI *PFNGETDYNAMICTIMEZONEINFORMATION)(PDYNAMIC_TIME_ZONE_INFORMATION);
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** Pointer to the GetDynamicTimeZoneInformation API if present. */
static PFNGETDYNAMICTIMEZONEINFORMATION g_pfnGetDynamicTimeZoneInformation = NULL;
/** Flipped after we've tried to resolve g_pfnGetDynamicTimeZoneInformation. */
static bool volatile g_fResolvedApi = false;
RTDECL(int) RTTimeZoneGetCurrent(char *pszName, size_t cbName)
{
AssertPtrReturn(pszName, VERR_INVALID_POINTER);
AssertReturn(cbName > 0, VERR_BUFFER_OVERFLOW);
/*
* Resolve API.
*/
PFNGETDYNAMICTIMEZONEINFORMATION pfnApi;
if (g_fResolvedApi)
pfnApi = g_pfnGetDynamicTimeZoneInformation;
else
{
pfnApi = (PFNGETDYNAMICTIMEZONEINFORMATION)GetProcAddress(g_hModKernel32, "GetDynamicTimeZoneInformation");
g_pfnGetDynamicTimeZoneInformation = pfnApi;
g_fResolvedApi = true;
}
/*
* Call the API and convert the name we get.
*/
union
{
TIME_ZONE_INFORMATION Tzi;
DYNAMIC_TIME_ZONE_INFORMATION DynTzi;
} uBuf;
RT_ZERO(uBuf);
DWORD dwRc;
PCRTUTF16 pwszSrcName;
size_t cwcSrcName;
if (pfnApi)
{
dwRc = pfnApi(&uBuf.DynTzi);
pwszSrcName = uBuf.DynTzi.TimeZoneKeyName;
cwcSrcName = RT_ELEMENTS(uBuf.DynTzi.TimeZoneKeyName);
}
else
{
/* Not sure how helpful this fallback really is... */
dwRc = GetTimeZoneInformation(&uBuf.Tzi);
pwszSrcName = uBuf.Tzi.StandardName;
cwcSrcName = RT_ELEMENTS(uBuf.Tzi.StandardName);
}
if (dwRc != TIME_ZONE_ID_INVALID)
{
Assert(*pwszSrcName != '\0');
return RTUtf16ToUtf8Ex(pwszSrcName, cwcSrcName, &pszName, cbName, &cbName);
}
return RTErrConvertFromWin32(GetLastError());
}
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