125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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********************************************************************************
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* Copyright (C) 2005-2015, International Business Machines
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* Corporation and others. All Rights Reserved.
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********************************************************************************
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*
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* File WINTZ.CPP
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*
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********************************************************************************
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*/
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#include "unicode/utypes.h"
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#if U_PLATFORM_USES_ONLY_WIN32_API
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#include "wintz.h"
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#include "cmemory.h"
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#include "cstring.h"
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#include "unicode/ures.h"
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#include "unicode/ustring.h"
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#include "uresimp.h"
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#ifndef WIN32_LEAN_AND_MEAN
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# define WIN32_LEAN_AND_MEAN
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#endif
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# define VC_EXTRALEAN
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# define NOUSER
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# define NOSERVICE
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# define NOIME
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# define NOMCX
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#include <windows.h>
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U_NAMESPACE_BEGIN
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// The max size of TimeZoneKeyName is 128, defined in DYNAMIC_TIME_ZONE_INFORMATION
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#define MAX_TIMEZONE_ID_LENGTH 128
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/**
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* Main Windows time zone detection function.
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* Returns the Windows time zone converted to an ICU time zone as a heap-allocated buffer, or nullptr upon failure.
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* Note: We use the Win32 API GetDynamicTimeZoneInformation to get the current time zone info.
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* This API returns a non-localized time zone name, which we can then map to an ICU time zone name.
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*/
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U_CAPI const char* U_EXPORT2
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uprv_detectWindowsTimeZone()
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{
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UErrorCode status = U_ZERO_ERROR;
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char* icuid = nullptr;
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char dynamicTZKeyName[MAX_TIMEZONE_ID_LENGTH];
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char tmpid[MAX_TIMEZONE_ID_LENGTH];
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int32_t len;
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int id = GEOID_NOT_AVAILABLE;
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int errorCode;
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wchar_t ISOcodeW[3] = {}; /* 2 letter ISO code in UTF-16 */
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char ISOcode[3] = {}; /* 2 letter ISO code in UTF-8 */
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DYNAMIC_TIME_ZONE_INFORMATION dynamicTZI;
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uprv_memset(&dynamicTZI, 0, sizeof(dynamicTZI));
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uprv_memset(dynamicTZKeyName, 0, sizeof(dynamicTZKeyName));
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uprv_memset(tmpid, 0, sizeof(tmpid));
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/* Obtain TIME_ZONE_INFORMATION from the API and get the non-localized time zone name. */
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if (TIME_ZONE_ID_INVALID == GetDynamicTimeZoneInformation(&dynamicTZI)) {
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return nullptr;
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}
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id = GetUserGeoID(GEOCLASS_NATION);
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errorCode = GetGeoInfoW(id, GEO_ISO2, ISOcodeW, 3, 0);
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// convert from wchar_t* (UTF-16 on Windows) to char* (UTF-8).
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u_strToUTF8(ISOcode, UPRV_LENGTHOF(ISOcode), nullptr,
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reinterpret_cast<const UChar*>(ISOcodeW), UPRV_LENGTHOF(ISOcodeW), &status);
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LocalUResourceBundlePointer bundle(ures_openDirect(nullptr, "windowsZones", &status));
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ures_getByKey(bundle.getAlias(), "mapTimezones", bundle.getAlias(), &status);
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// convert from wchar_t* (UTF-16 on Windows) to char* (UTF-8).
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u_strToUTF8(dynamicTZKeyName, UPRV_LENGTHOF(dynamicTZKeyName), nullptr,
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reinterpret_cast<const UChar*>(dynamicTZI.TimeZoneKeyName), -1, &status);
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if (U_FAILURE(status)) {
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return nullptr;
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}
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if (dynamicTZI.TimeZoneKeyName[0] != 0) {
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StackUResourceBundle winTZ;
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ures_getByKey(bundle.getAlias(), dynamicTZKeyName, winTZ.getAlias(), &status);
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if (U_SUCCESS(status)) {
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const UChar* icuTZ = nullptr;
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if (errorCode != 0) {
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icuTZ = ures_getStringByKey(winTZ.getAlias(), ISOcode, &len, &status);
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}
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if (errorCode == 0 || icuTZ == nullptr) {
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/* fallback to default "001" and reset status */
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status = U_ZERO_ERROR;
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icuTZ = ures_getStringByKey(winTZ.getAlias(), "001", &len, &status);
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}
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if (U_SUCCESS(status)) {
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int index = 0;
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while (!(*icuTZ == '\0' || *icuTZ == ' ')) {
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// time zone IDs only contain ASCII invariant characters.
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tmpid[index++] = (char)(*icuTZ++);
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}
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tmpid[index] = '\0';
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}
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}
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}
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// Copy the timezone ID to icuid to be returned.
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if (tmpid[0] != 0) {
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icuid = uprv_strdup(tmpid);
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}
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return icuid;
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}
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U_NAMESPACE_END
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#endif /* U_PLATFORM_USES_ONLY_WIN32_API */
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