michael@0: /*
michael@0: *******************************************************************************
michael@0: *
michael@0: *   Copyright (C) 1997-2013, International Business Machines
michael@0: *   Corporation and others.  All Rights Reserved.
michael@0: *
michael@0: *******************************************************************************
michael@0: *   file name:  locavailable.cpp
michael@0: *   encoding:   US-ASCII
michael@0: *   tab size:   8 (not used)
michael@0: *   indentation:4
michael@0: *
michael@0: *   created on: 2010feb25
michael@0: *   created by: Markus W. Scherer
michael@0: *
michael@0: *   Code for available locales, separated out from other .cpp files
michael@0: *   that then do not depend on resource bundle code and res_index bundles.
michael@0: */
michael@0: 
michael@0: #include "unicode/utypes.h"
michael@0: #include "unicode/locid.h"
michael@0: #include "unicode/uloc.h"
michael@0: #include "unicode/ures.h"
michael@0: #include "cmemory.h"
michael@0: #include "ucln_cmn.h"
michael@0: #include "uassert.h"
michael@0: #include "umutex.h"
michael@0: #include "uresimp.h"
michael@0: 
michael@0: // C++ API ----------------------------------------------------------------- ***
michael@0: 
michael@0: U_NAMESPACE_BEGIN
michael@0: 
michael@0: static icu::Locale*  availableLocaleList = NULL;
michael@0: static int32_t  availableLocaleListCount;
michael@0: static icu::UInitOnce gInitOnce = U_INITONCE_INITIALIZER;
michael@0: 
michael@0: U_NAMESPACE_END
michael@0: 
michael@0: U_CDECL_BEGIN
michael@0: 
michael@0: static UBool U_CALLCONV locale_available_cleanup(void)
michael@0: {
michael@0:     U_NAMESPACE_USE
michael@0: 
michael@0:     if (availableLocaleList) {
michael@0:         delete []availableLocaleList;
michael@0:         availableLocaleList = NULL;
michael@0:     }
michael@0:     availableLocaleListCount = 0;
michael@0:     gInitOnce.reset();
michael@0: 
michael@0:     return TRUE;
michael@0: }
michael@0: 
michael@0: U_CDECL_END
michael@0: 
michael@0: U_NAMESPACE_BEGIN
michael@0: 
michael@0: void U_CALLCONV locale_available_init() {
michael@0:     // This function is a friend of class Locale.
michael@0:     // This function is only invoked via umtx_initOnce().
michael@0:     
michael@0:     // for now, there is a hardcoded list, so just walk through that list and set it up.
michael@0:     //  Note: this function is a friend of class Locale.
michael@0:     availableLocaleListCount = uloc_countAvailable();
michael@0:     if(availableLocaleListCount) {
michael@0:        availableLocaleList = new Locale[availableLocaleListCount];
michael@0:     }
michael@0:     if (availableLocaleList == NULL) {
michael@0:         availableLocaleListCount= 0;
michael@0:     }
michael@0:     for (int32_t locCount=availableLocaleListCount-1; locCount>=0; --locCount) {
michael@0:         availableLocaleList[locCount].setFromPOSIXID(uloc_getAvailable(locCount));
michael@0:     }
michael@0:     ucln_common_registerCleanup(UCLN_COMMON_LOCALE_AVAILABLE, locale_available_cleanup);
michael@0: }
michael@0: 
michael@0: const Locale* U_EXPORT2
michael@0: Locale::getAvailableLocales(int32_t& count)
michael@0: {
michael@0:     umtx_initOnce(gInitOnce, &locale_available_init);
michael@0:     count = availableLocaleListCount;
michael@0:     return availableLocaleList;
michael@0: }
michael@0: 
michael@0: 
michael@0: U_NAMESPACE_END
michael@0: 
michael@0: // C API ------------------------------------------------------------------- ***
michael@0: 
michael@0: U_NAMESPACE_USE
michael@0: 
michael@0: /* ### Constants **************************************************/
michael@0: 
michael@0: /* These strings describe the resources we attempt to load from
michael@0:  the locale ResourceBundle data file.*/
michael@0: static const char _kIndexLocaleName[] = "res_index";
michael@0: static const char _kIndexTag[]        = "InstalledLocales";
michael@0: 
michael@0: static char** _installedLocales = NULL;
michael@0: static int32_t _installedLocalesCount = 0;
michael@0: static icu::UInitOnce _installedLocalesInitOnce;
michael@0: 
michael@0: /* ### Get available **************************************************/
michael@0: 
michael@0: static UBool U_CALLCONV uloc_cleanup(void) {
michael@0:     char ** temp;
michael@0: 
michael@0:     if (_installedLocales) {
michael@0:         temp = _installedLocales;
michael@0:         _installedLocales = NULL;
michael@0: 
michael@0:         _installedLocalesCount = 0;
michael@0:         _installedLocalesInitOnce.reset();
michael@0: 
michael@0:         uprv_free(temp);
michael@0:     }
michael@0:     return TRUE;
michael@0: }
michael@0: 
michael@0: // Load Installed Locales. This function will be called exactly once
michael@0: //   via the initOnce mechanism.
michael@0: 
michael@0: static void U_CALLCONV loadInstalledLocales() {
michael@0:     UResourceBundle *indexLocale = NULL;
michael@0:     UResourceBundle installed;
michael@0:     UErrorCode status = U_ZERO_ERROR;
michael@0:     int32_t i = 0;
michael@0:     int32_t localeCount;
michael@0:     
michael@0:     U_ASSERT(_installedLocales == NULL);
michael@0:     U_ASSERT(_installedLocalesCount == 0);
michael@0: 
michael@0:     _installedLocalesCount = 0;
michael@0:     ures_initStackObject(&installed);
michael@0:     indexLocale = ures_openDirect(NULL, _kIndexLocaleName, &status);
michael@0:     ures_getByKey(indexLocale, _kIndexTag, &installed, &status);
michael@0:     
michael@0:     if(U_SUCCESS(status)) {
michael@0:         localeCount = ures_getSize(&installed);
michael@0:         _installedLocales = (char **) uprv_malloc(sizeof(char*) * (localeCount+1));
michael@0:         if (_installedLocales != NULL) {
michael@0:             ures_resetIterator(&installed);
michael@0:             while(ures_hasNext(&installed)) {
michael@0:                 ures_getNextString(&installed, NULL, (const char **)&_installedLocales[i++], &status);
michael@0:             }
michael@0:             _installedLocales[i] = NULL;
michael@0:             _installedLocalesCount = localeCount;
michael@0:             ucln_common_registerCleanup(UCLN_COMMON_ULOC, uloc_cleanup);
michael@0:         }
michael@0:     }
michael@0:     ures_close(&installed);
michael@0:     ures_close(indexLocale);
michael@0: }
michael@0: 
michael@0: static void _load_installedLocales()
michael@0: {
michael@0:     umtx_initOnce(_installedLocalesInitOnce, &loadInstalledLocales);
michael@0: }
michael@0: 
michael@0: U_CAPI const char* U_EXPORT2
michael@0: uloc_getAvailable(int32_t offset) 
michael@0: {
michael@0:     
michael@0:     _load_installedLocales();
michael@0:     
michael@0:     if (offset > _installedLocalesCount)
michael@0:         return NULL;
michael@0:     return _installedLocales[offset];
michael@0: }
michael@0: 
michael@0: U_CAPI int32_t  U_EXPORT2
michael@0: uloc_countAvailable()
michael@0: {
michael@0:     _load_installedLocales();
michael@0:     return _installedLocalesCount;
michael@0: }
michael@0: