VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/win/RTTimeZoneGetCurrent-win.cpp@ 103795

Last change on this file since 103795 was 98103, checked in by vboxsync, 23 months ago

Copyright year updates by scm.

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