#include "unicode/utypes.h"
-// This file contains only desktop Windows behavior
-// Windows UWP calls Windows::Globalization directly, so this isn't needed there.
-#if U_PLATFORM_USES_ONLY_WIN32_API && (U_PLATFORM_HAS_WINUWP_API == 0)
+#if U_PLATFORM_HAS_WIN32_API
#include "wintz.h"
#include "cmemory.h"
# define NOMCX
#include <windows.h>
-#define MAX_LENGTH_ID 40
-
-/* The layout of the Tzi value in the registry */
-typedef struct
-{
- int32_t bias;
- int32_t standardBias;
- int32_t daylightBias;
- SYSTEMTIME standardDate;
- SYSTEMTIME daylightDate;
-} TZI;
+// The value of MAX_TIMEZONE_ID_LENGTH is 128, which is defined in DYNAMIC_TIME_ZONE_INFORMATION
+#define MAX_TIMEZONE_ID_LENGTH 128
/**
- * Various registry keys and key fragments.
- */
-static const wchar_t CURRENT_ZONE_REGKEY[] = L"SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation\\";
-static const char STANDARD_TIME_REGKEY[] = " Standard Time";
-static const char TZI_REGKEY[] = "TZI";
-static const char STD_REGKEY[] = "Std";
-
-/**
- * The time zone root keys (under HKLM) for Win7+
- */
-static const char TZ_REGKEY[] = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones\\";
-
-static LONG openTZRegKey(HKEY *hkey, const char *winid)
-{
- char subKeyName[110]; /* TODO: why 110?? */
- char *name;
- LONG result;
-
- uprv_strcpy(subKeyName, TZ_REGKEY);
- name = &subKeyName[strlen(subKeyName)];
- uprv_strcat(subKeyName, winid);
-
- result = RegOpenKeyExA(HKEY_LOCAL_MACHINE,
- subKeyName,
- 0,
- KEY_QUERY_VALUE,
- hkey);
- return result;
-}
-
-static LONG getTZI(const char *winid, TZI *tzi)
-{
- DWORD cbData = sizeof(TZI);
- LONG result;
- HKEY hkey;
-
- result = openTZRegKey(&hkey, winid);
-
- if (result == ERROR_SUCCESS)
- {
- result = RegQueryValueExA(hkey,
- TZI_REGKEY,
- NULL,
- NULL,
- (LPBYTE)tzi,
- &cbData);
- RegCloseKey(hkey);
- }
-
- return result;
-}
-
-static LONG getSTDName(const char *winid, char *regStdName, int32_t length)
-{
- DWORD cbData = length;
- LONG result;
- HKEY hkey;
-
- result = openTZRegKey(&hkey, winid);
-
- if (result == ERROR_SUCCESS)
- {
- result = RegQueryValueExA(hkey,
- STD_REGKEY,
- NULL,
- NULL,
- (LPBYTE)regStdName,
- &cbData);
- RegCloseKey(hkey);
- }
-
- return result;
-}
-
-static LONG getTZKeyName(char* tzKeyName, int32_t tzKeyNamelength)
-{
- HKEY hkey;
- LONG result = FALSE;
- WCHAR timeZoneKeyNameData[128];
- DWORD timeZoneKeyNameLength = static_cast<DWORD>(sizeof(timeZoneKeyNameData));
-
- if(ERROR_SUCCESS == RegOpenKeyExW(
- HKEY_LOCAL_MACHINE,
- CURRENT_ZONE_REGKEY,
- 0,
- KEY_QUERY_VALUE,
- &hkey))
- {
- if (ERROR_SUCCESS == RegQueryValueExW(
- hkey,
- L"TimeZoneKeyName",
- NULL,
- NULL,
- (LPBYTE)timeZoneKeyNameData,
- &timeZoneKeyNameLength))
- {
- // Ensure null termination.
- timeZoneKeyNameData[UPRV_LENGTHOF(timeZoneKeyNameData) - 1] = L'\0';
-
- // Convert the UTF-16 string to UTF-8.
- UErrorCode status = U_ZERO_ERROR;
- u_strToUTF8(tzKeyName, tzKeyNamelength, NULL, reinterpret_cast<const UChar *>(timeZoneKeyNameData), -1, &status);
- if (U_ZERO_ERROR == status)
- {
- result = ERROR_SUCCESS;
- }
- }
- RegCloseKey(hkey);
- }
-
- return result;
-}
-
-/*
- This code attempts to detect the Windows time zone directly,
- as set in the Windows Date and Time control panel. It attempts
- to work on versions greater than Windows Vista and on localized
- installs. It works by directly interrogating the registry and
- comparing the data there with the data returned by the
- GetTimeZoneInformation API, along with some other strategies. The
- registry contains time zone data under this key:
-
- HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\
-
- Under this key are several subkeys, one for each time zone. For
- example these subkeys are named "Pacific Standard Time" on Vista+.
- There are some other wrinkles; see the code for
- details. The subkey name is NOT LOCALIZED, allowing us to support
- localized installs.
-
- Under the subkey are data values. We care about:
-
- Std Standard time display name, localized
- TZI Binary block of data
-
- The TZI data is of particular interest. It contains the offset, two
- more offsets for standard and daylight time, and the start and end
- rules. This is the same data returned by the GetTimeZoneInformation
- API. The API may modify the data on the way out, so we have to be
- careful, but essentially we do a binary comparison against the TZI
- blocks of various registry keys. When we find a match, we know what
- time zone Windows is set to. Since the registry key is not
- localized, we can then translate the key through a simple table
- lookup into the corresponding ICU time zone.
-
- This strategy doesn't always work because there are zones which
- share an offset and rules, so more than one TZI block will match.
- For example, both Tokyo and Seoul are at GMT+9 with no DST rules;
- their TZI blocks are identical. For these cases, we fall back to a
- name lookup. We attempt to match the display name as stored in the
- registry for the current zone to the display name stored in the
- registry for various Windows zones. By comparing the registry data
- directly we avoid conversion complications.
-
- Author: Alan Liu
- Since: ICU 2.6
- Based on original code by Carl Brown <cbrown@xnetinc.com>
+* Main Windows time zone detection function. Returns the Windows
+* time zone, translated to an ICU time zone, or nullptr upon failure.
+* It is calling GetDynamicTimeZoneInformation to get the current time zone info.
+* The API returns non-localized time zone name so it can be used for mapping ICU time zone name.
*/
-
-/**
- * Main Windows time zone detection function. Returns the Windows
- * time zone, translated to an ICU time zone, or NULL upon failure.
- */
U_CFUNC const char* U_EXPORT2
-uprv_detectWindowsTimeZone()
+uprv_detectWindowsTimeZone()
{
UErrorCode status = U_ZERO_ERROR;
- UResourceBundle* bundle = NULL;
- char* icuid = NULL;
- char apiStdName[MAX_LENGTH_ID];
- char regStdName[MAX_LENGTH_ID];
- char tmpid[MAX_LENGTH_ID];
+ UResourceBundle* bundle = nullptr;
+ char* icuid = nullptr;
+ char dynamicTZKeyName[MAX_TIMEZONE_ID_LENGTH] = {};
+ char tmpid[MAX_TIMEZONE_ID_LENGTH] = {};
int32_t len;
int id;
int errorCode;
- wchar_t ISOcodeW[3]; /* 2 letter iso code in UTF-16*/
- char ISOcodeA[3]; /* 2 letter iso code in ansi */
+ wchar_t ISOcodeW[3] = {}; /* 2 letter iso code in UTF-16*/
+ char ISOcodeA[3] = {}; /* 2 letter iso code in ansi */
- LONG result;
- TZI tziKey;
- TZI tziReg;
- TIME_ZONE_INFORMATION apiTZI;
+ DYNAMIC_TIME_ZONE_INFORMATION dynamicTZI;
- BOOL tryPreVistaFallback;
- OSVERSIONINFO osVerInfo;
-
- /* Obtain TIME_ZONE_INFORMATION from the API, and then convert it
- to TZI. We could also interrogate the registry directly; we do
- this below if needed. */
- uprv_memset(&apiTZI, 0, sizeof(apiTZI));
- uprv_memset(&tziKey, 0, sizeof(tziKey));
- uprv_memset(&tziReg, 0, sizeof(tziReg));
- GetTimeZoneInformation(&apiTZI);
- tziKey.bias = apiTZI.Bias;
- uprv_memcpy((char *)&tziKey.standardDate, (char*)&apiTZI.StandardDate,
- sizeof(apiTZI.StandardDate));
- uprv_memcpy((char *)&tziKey.daylightDate, (char*)&apiTZI.DaylightDate,
- sizeof(apiTZI.DaylightDate));
-
- /* Convert the wchar_t* standard name to char* */
- uprv_memset(apiStdName, 0, sizeof(apiStdName));
- wcstombs(apiStdName, apiTZI.StandardName, MAX_LENGTH_ID);
+ /* Obtain TIME_ZONE_INFORMATION from the API and get the non-localized time zone name. */
+ uprv_memset(&dynamicTZI, 0, sizeof(dynamicTZI));
+ if (TIME_ZONE_ID_INVALID == GetDynamicTimeZoneInformation(&dynamicTZI))
+ {
+ return nullptr;
+ }
tmpid[0] = 0;
id = GetUserGeoID(GEOCLASS_NATION);
errorCode = GetGeoInfoW(id, GEO_ISO2, ISOcodeW, 3, 0);
- u_strToUTF8(ISOcodeA, 3, NULL, (const UChar *)ISOcodeW, 3, &status);
+ u_strToUTF8(ISOcodeA, 3, nullptr, (const UChar *)ISOcodeW, 3, &status);
- bundle = ures_openDirect(NULL, "windowsZones", &status);
+ bundle = ures_openDirect(nullptr, "windowsZones", &status);
ures_getByKey(bundle, "mapTimezones", bundle, &status);
- /*
- Windows Vista+ provides us with a "TimeZoneKeyName" that is not localized
- and can be used to directly map a name in our bundle. Try to use that first
- if we're on Vista or higher
- */
- uprv_memset(&osVerInfo, 0, sizeof(osVerInfo));
- osVerInfo.dwOSVersionInfoSize = sizeof(osVerInfo);
- tryPreVistaFallback = TRUE;
- result = getTZKeyName(regStdName, sizeof(regStdName));
- if(ERROR_SUCCESS == result)
+ /* Convert the wchar_t* standard name to char* */
+ uprv_memset(dynamicTZKeyName, 0, sizeof(dynamicTZKeyName));
+ u_strToUTF8(dynamicTZKeyName, MAX_TIMEZONE_ID_LENGTH, nullptr, (const UChar *)dynamicTZI.TimeZoneKeyName, MAX_TIMEZONE_ID_LENGTH, &status);
+
+ if (dynamicTZI.TimeZoneKeyName[0] != 0)
{
- UResourceBundle* winTZ = ures_getByKey(bundle, regStdName, NULL, &status);
- if(U_SUCCESS(status))
+ UResourceBundle* winTZ = ures_getByKey(bundle, dynamicTZKeyName, nullptr, &status);
+ if (U_SUCCESS(status))
{
- const UChar* icuTZ = NULL;
- if (errorCode != 0)
+ const UChar* icuTZ = nullptr;
+ if (errorCode != 0)
{
icuTZ = ures_getStringByKey(winTZ, ISOcodeA, &len, &status);
}
- if (errorCode==0 || icuTZ==NULL)
+ if (errorCode == 0 || icuTZ == nullptr)
{
/* fallback to default "001" and reset status */
status = U_ZERO_ERROR;
icuTZ = ures_getStringByKey(winTZ, "001", &len, &status);
}
- if(U_SUCCESS(status))
+ if (U_SUCCESS(status))
{
- int index=0;
- while (! (*icuTZ == '\0' || *icuTZ ==' '))
+ int index = 0;
+ while (!(*icuTZ == '\0' || *icuTZ == ' '))
{
- tmpid[index++]=(char)(*icuTZ++); /* safe to assume 'char' is ASCII compatible on windows */
+ tmpid[index++] = (char)(*icuTZ++); /* safe to assume 'char' is ASCII compatible on windows */
}
- tmpid[index]='\0';
- tryPreVistaFallback = FALSE;
+ tmpid[index] = '\0';
}
}
ures_close(winTZ);
}
- if(tryPreVistaFallback)
- {
- /* Note: We get the winid not from static tables but from resource bundle. */
- while (U_SUCCESS(status) && ures_hasNext(bundle))
- {
- UBool idFound = FALSE;
- const char* winid;
- UResourceBundle* winTZ = ures_getNextResource(bundle, NULL, &status);
- if (U_FAILURE(status))
- {
- break;
- }
- winid = ures_getKey(winTZ);
- result = getTZI(winid, &tziReg);
-
- if (result == ERROR_SUCCESS)
- {
- /* Windows alters the DaylightBias in some situations.
- Using the bias and the rules suffices, so overwrite
- these unreliable fields. */
- tziKey.standardBias = tziReg.standardBias;
- tziKey.daylightBias = tziReg.daylightBias;
-
- if (uprv_memcmp((char *)&tziKey, (char*)&tziReg, sizeof(tziKey)) == 0)
- {
- const UChar* icuTZ = NULL;
- if (errorCode != 0)
- {
- icuTZ = ures_getStringByKey(winTZ, ISOcodeA, &len, &status);
- }
- if (errorCode==0 || icuTZ==NULL)
- {
- /* fallback to default "001" and reset status */
- status = U_ZERO_ERROR;
- icuTZ = ures_getStringByKey(winTZ, "001", &len, &status);
- }
-
- if (U_SUCCESS(status))
- {
- /* Get the standard name from the registry key to compare with
- the one from Windows API call. */
- uprv_memset(regStdName, 0, sizeof(regStdName));
- result = getSTDName(winid, regStdName, sizeof(regStdName));
- if (result == ERROR_SUCCESS)
- {
- if (uprv_strcmp(apiStdName, regStdName) == 0)
- {
- idFound = TRUE;
- }
- }
-
- /* tmpid buffer holds the ICU timezone ID corresponding to the timezone ID from Windows.
- * If none is found, tmpid buffer will contain a fallback ID (i.e. the time zone ID matching
- * the current time zone information)
- */
- if (idFound || tmpid[0] == 0)
- {
- /* if icuTZ has more than one city, take only the first (i.e. terminate icuTZ at first space) */
- int index=0;
- while (! (*icuTZ == '\0' || *icuTZ ==' '))
- {
- tmpid[index++]=(char)(*icuTZ++); /* safe to assume 'char' is ASCII compatible on windows */
- }
- tmpid[index]='\0';
- }
- }
- }
- }
- ures_close(winTZ);
- if (idFound)
- {
- break;
- }
- }
- }
-
/*
- * Copy the timezone ID to icuid to be returned.
- */
- if (tmpid[0] != 0)
+ * Copy the timezone ID to icuid to be returned.
+ */
+ if (tmpid[0] != 0)
{
len = static_cast<int32_t>(uprv_strlen(tmpid));
icuid = (char*)uprv_calloc(len + 1, sizeof(char));
- if (icuid != NULL)
+ if (icuid != nullptr)
{
uprv_strcpy(icuid, tmpid);
}
}
ures_close(bundle);
-
+
return icuid;
}
-#endif /* U_PLATFORM_USES_ONLY_WIN32_API && (U_PLATFORM_HAS_WINUWP_API == 0) */
+#endif /* U_PLATFORM_HAS_WIN32_API */
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