Added support for getting a list of all available timezone IDs to LocaleRoster.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38321 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/locale/LocaleRoster.h

@@ -45,6 +45,7 @@ public:
 									// contain the language-name(s)
 
 			status_t			GetAvailableCountries(BMessage* message) const;
+			status_t			GetAvailableTimeZones(BMessage* message) const;
 
 			status_t			GetInstalledCatalogs(BMessage* message,
 									const char* sigPattern = NULL,

src/kits/locale/LocaleRoster.cpp

@@ -229,6 +229,37 @@ BLocaleRoster::GetAvailableCountries(BMessage* countries) const
 }
 
 
+status_t
+BLocaleRoster::GetAvailableTimeZones(BMessage* timeZones) const
+{
+	if (!timeZones)
+		return B_BAD_VALUE;
+
+	status_t status = B_OK;
+
+	int32 i;
+	StringEnumeration* zoneList = TimeZone::createEnumeration();
+
+	UErrorCode icuStatus = U_ZERO_ERROR;
+	int32 count = zoneList->count(icuStatus);
+	if (U_SUCCESS(icuStatus)) {
+		for (i = 0; i < count; ++i) {
+			const char* zoneID = zoneList->next(NULL, icuStatus);
+			if (zoneID == NULL || !U_SUCCESS(icuStatus)) {
+				status = B_ERROR;
+				break;
+			}
+ 			timeZones->AddString("timeZone", zoneID);
+		}
+	} else
+		status = B_ERROR;
+
+	delete zoneList;
+
+	return status;
+}
+
+
 status_t
 BLocaleRoster::GetInstalledCatalogs(BMessage*  languageList,
 		const char* sigPattern,	const char* langPattern, int32 fingerprint) const