| 1 | /* $Id: RTTimeZoneGetCurrent-win.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - RTTimeZoneGetCurrent, generic.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2017-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <iprt/time.h>
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| 42 | #include "internal/iprt.h"
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| 43 |
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| 44 | #include <iprt/errcore.h>
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| 45 | #include <iprt/env.h>
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| 46 | #include <iprt/string.h>
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| 47 | #include <iprt/utf16.h>
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| 48 | #include <iprt/win/windows.h>
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| 49 | #include "internal-r3-win.h"
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| 50 |
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| 51 |
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| 52 | /*********************************************************************************************************************************
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| 53 | * Structures and Typedefs *
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| 54 | *********************************************************************************************************************************/
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| 55 | typedef DWORD (WINAPI *PFNGETDYNAMICTIMEZONEINFORMATION)(PDYNAMIC_TIME_ZONE_INFORMATION);
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| 56 |
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| 57 |
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| 58 | /*********************************************************************************************************************************
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| 59 | * Global Variables *
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| 60 | *********************************************************************************************************************************/
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| 61 | /** Pointer to the GetDynamicTimeZoneInformation API if present. */
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| 62 | static PFNGETDYNAMICTIMEZONEINFORMATION g_pfnGetDynamicTimeZoneInformation = NULL;
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| 63 | /** Flipped after we've tried to resolve g_pfnGetDynamicTimeZoneInformation. */
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| 64 | static bool volatile g_fResolvedApi = false;
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| 65 |
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| 66 |
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| 67 | RTDECL(int) RTTimeZoneGetCurrent(char *pszName, size_t cbName)
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| 68 | {
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| 69 | AssertPtrReturn(pszName, VERR_INVALID_POINTER);
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| 70 | AssertReturn(cbName > 0, VERR_BUFFER_OVERFLOW);
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| 71 |
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| 72 | /*
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| 73 | * Resolve API.
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| 74 | */
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| 75 | PFNGETDYNAMICTIMEZONEINFORMATION pfnApi;
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| 76 | if (g_fResolvedApi)
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| 77 | pfnApi = g_pfnGetDynamicTimeZoneInformation;
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| 78 | else
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| 79 | {
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| 80 | pfnApi = (PFNGETDYNAMICTIMEZONEINFORMATION)GetProcAddress(g_hModKernel32, "GetDynamicTimeZoneInformation");
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| 81 | g_pfnGetDynamicTimeZoneInformation = pfnApi;
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| 82 | g_fResolvedApi = true;
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| 83 | }
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| 84 |
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| 85 | /*
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| 86 | * Call the API and convert the name we get.
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| 87 | */
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| 88 | union
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| 89 | {
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| 90 | TIME_ZONE_INFORMATION Tzi;
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| 91 | DYNAMIC_TIME_ZONE_INFORMATION DynTzi;
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| 92 | } uBuf;
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| 93 | RT_ZERO(uBuf);
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| 94 | DWORD dwRc;
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| 95 | PCRTUTF16 pwszSrcName;
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| 96 | size_t cwcSrcName;
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| 97 | if (pfnApi)
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| 98 | {
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| 99 | dwRc = pfnApi(&uBuf.DynTzi);
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| 100 | pwszSrcName = uBuf.DynTzi.TimeZoneKeyName;
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| 101 | cwcSrcName = RT_ELEMENTS(uBuf.DynTzi.TimeZoneKeyName);
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| 102 | }
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| 103 | else
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| 104 | {
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| 105 | /* Not sure how helpful this fallback really is... */
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| 106 | dwRc = GetTimeZoneInformation(&uBuf.Tzi);
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| 107 | pwszSrcName = uBuf.Tzi.StandardName;
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| 108 | cwcSrcName = RT_ELEMENTS(uBuf.Tzi.StandardName);
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| 109 | }
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| 110 | if (dwRc != TIME_ZONE_ID_INVALID)
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| 111 | {
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| 112 | Assert(*pwszSrcName != '\0');
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| 113 | return RTUtf16ToUtf8Ex(pwszSrcName, cwcSrcName, &pszName, cbName, &cbName);
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| 114 | }
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| 115 | return RTErrConvertFromWin32(GetLastError());
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| 116 | }
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| 117 |
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