/**
* 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() {
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];
int32_t len;
int id;
int errorCode;
UChar 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;
BOOL isVistaOrHigher;
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);
tmpid[0] = 0;
id = GetUserGeoID(GEOCLASS_NATION);
errorCode = GetGeoInfoW(id,GEO_ISO2,ISOcodeW,3,0);
u_strToUTF8(ISOcodeA, 3, NULL, ISOcodeW, 3, &status);
bundle = ures_openDirect(NULL, "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);
GetVersionEx(&osVerInfo);
isVistaOrHigher = osVerInfo.dwMajorVersion >= 6; /* actually includes Windows Server 2008 as well, but don't worry about it */
tryPreVistaFallback = TRUE;
if(isVistaOrHigher) {
result = getTZKeyName(regStdName, sizeof(regStdName));
if(ERROR_SUCCESS == result) {
UResourceBundle* winTZ = ures_getByKey(bundle, regStdName, NULL, &status);
if(U_SUCCESS(status)) {
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)) {
int index=0;
while (! (*icuTZ == '\0' || *icuTZ ==' ')) {
tmpid[index++]=(char)(*icuTZ++); /* safe to assume 'char' is ASCII compatible on windows */
}
tmpid[index]='\0';
tryPreVistaFallback = FALSE;
}
}
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) {
len = uprv_strlen(tmpid);
icuid = (char*)uprv_calloc(len + 1, sizeof(char));
if (icuid != NULL) {
uprv_strcpy(icuid, tmpid);
}
}
ures_close(bundle);
return icuid;
}
/**
* 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() {
UErrorCode status = U_ZERO_ERROR;
UResourceBundle* bundle = NULL;
char* icuid = NULL;
UChar apiStd[MAX_LENGTH_ID];
char apiStdName[MAX_LENGTH_ID];
char regStdName[MAX_LENGTH_ID];
char tmpid[MAX_LENGTH_ID];
int32_t len;
int id;
int errorCode;
char ISOcode[3]; /* 2 letter iso code */
LONG result;
TZI tziKey;
TZI tziReg;
TIME_ZONE_INFORMATION apiTZI;
/* 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));
u_strFromWCS(apiStd, MAX_LENGTH_ID, NULL, apiTZI.StandardName, -1, &status);
u_austrncpy(apiStdName, apiStd, sizeof(apiStdName) - 1);
tmpid[0] = 0;
id = GetUserGeoID(GEOCLASS_NATION);
errorCode = GetGeoInfoA(id,GEO_ISO2,ISOcode,3,0);
bundle = ures_openDirect(NULL, "windowsZones", &status);
ures_getByKey(bundle, "mapTimezones", bundle, &status);
/* 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, ISOcode, &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) {
len = uprv_strlen(tmpid);
icuid = (char*)uprv_calloc(len + 1, sizeof(char));
if (icuid != NULL) {
uprv_strcpy(icuid, tmpid);
}
}
ures_close(bundle);
return icuid;
}
