icuSources/common/locavailable.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 *******************************************************************************
   5 *
   6 *   Copyright (C) 1997-2013, International Business Machines
   7 *   Corporation and others.  All Rights Reserved.
   8 *
   9 *******************************************************************************
  10 *   file name:  locavailable.cpp
  11 *   encoding:   UTF-8
  12 *   tab size:   8 (not used)
  13 *   indentation:4
  14 *
  15 *   created on: 2010feb25
  16 *   created by: Markus W. Scherer
  17 *
  18 *   Code for available locales, separated out from other .cpp files
  19 *   that then do not depend on resource bundle code and res_index bundles.
  20 */
  21
  22 #include "unicode/utypes.h"
  23 #include "unicode/locid.h"
  24 #include "unicode/uloc.h"
  25 #include "unicode/ures.h"
  26 #include "cmemory.h"
  27 #include "ucln_cmn.h"
  28 #include "uassert.h"
  29 #include "umutex.h"
  30 #include "uresimp.h"
  31
  32 // C++ API ----------------------------------------------------------------- ***
  33
  34 U_NAMESPACE_BEGIN
  35
  36 static icu::Locale*  availableLocaleList = NULL;
  37 static int32_t  availableLocaleListCount;
  38 static icu::UInitOnce gInitOnceLocale = U_INITONCE_INITIALIZER;
  39
  40 U_NAMESPACE_END
  41
  42 U_CDECL_BEGIN
  43
  44 static UBool U_CALLCONV locale_available_cleanup(void)
  45 {
  46     U_NAMESPACE_USE
  47
  48     if (availableLocaleList) {
  49         delete []availableLocaleList;
  50         availableLocaleList = NULL;
  51     }
  52     availableLocaleListCount = 0;
  53     gInitOnceLocale.reset();
  54
  55     return TRUE;
  56 }
  57
  58 U_CDECL_END
  59
  60 U_NAMESPACE_BEGIN
  61
  62 void U_CALLCONV locale_available_init() {
  63     // This function is a friend of class Locale.
  64     // This function is only invoked via umtx_initOnce().
  65
  66     // for now, there is a hardcoded list, so just walk through that list and set it up.
  67     //  Note: this function is a friend of class Locale.
  68     availableLocaleListCount = uloc_countAvailable();
  69     if(availableLocaleListCount) {
  70        availableLocaleList = new Locale[availableLocaleListCount];
  71     }
  72     if (availableLocaleList == NULL) {
  73         availableLocaleListCount= 0;
  74     }
  75     for (int32_t locCount=availableLocaleListCount-1; locCount>=0; --locCount) {
  76         availableLocaleList[locCount].setFromPOSIXID(uloc_getAvailable(locCount));
  77     }
  78     ucln_common_registerCleanup(UCLN_COMMON_LOCALE_AVAILABLE, locale_available_cleanup);
  79 }
  80
  81 const Locale* U_EXPORT2
  82 Locale::getAvailableLocales(int32_t& count)
  83 {
  84     umtx_initOnce(gInitOnceLocale, &locale_available_init);
  85     count = availableLocaleListCount;
  86     return availableLocaleList;
  87 }
  88
  89
  90 U_NAMESPACE_END
  91
  92 // C API ------------------------------------------------------------------- ***
  93
  94 U_NAMESPACE_USE
  95
  96 /* ### Constants **************************************************/
  97
  98 /* These strings describe the resources we attempt to load from
  99  the locale ResourceBundle data file.*/
 100 static const char _kIndexLocaleName[] = "res_index";
 101 static const char _kIndexTag[]        = "InstalledLocales";
 102
 103 static char** _installedLocales = NULL;
 104 static int32_t _installedLocalesCount = 0;
 105 static icu::UInitOnce _installedLocalesInitOnce;
 106
 107 /* ### Get available **************************************************/
 108
 109 static UBool U_CALLCONV uloc_cleanup(void) {
 110     char ** temp;
 111
 112     if (_installedLocales) {
 113         temp = _installedLocales;
 114         _installedLocales = NULL;
 115
 116         _installedLocalesCount = 0;
 117         _installedLocalesInitOnce.reset();
 118
 119         uprv_free(temp);
 120     }
 121     return TRUE;
 122 }
 123
 124 // Load Installed Locales. This function will be called exactly once
 125 //   via the initOnce mechanism.
 126
 127 static void U_CALLCONV loadInstalledLocales() {
 128     UErrorCode status = U_ZERO_ERROR;
 129     int32_t i = 0;
 130     int32_t localeCount;
 131
 132     U_ASSERT(_installedLocales == NULL);
 133     U_ASSERT(_installedLocalesCount == 0);
 134
 135     _installedLocalesCount = 0;
 136
 137     icu::LocalUResourceBundlePointer indexLocale(ures_openDirect(NULL, _kIndexLocaleName, &status));
 138     icu::StackUResourceBundle installed;
 139
 140     ures_getByKey(indexLocale.getAlias(), _kIndexTag, installed.getAlias(), &status);
 141
 142     if(U_SUCCESS(status)) {
 143         localeCount = ures_getSize(installed.getAlias());
 144         _installedLocales = (char **) uprv_malloc(sizeof(char*) * (localeCount+1));
 145         if (_installedLocales != NULL) {
 146             ures_resetIterator(installed.getAlias());
 147             while(ures_hasNext(installed.getAlias())) {
 148                 ures_getNextString(installed.getAlias(), NULL, (const char **)&_installedLocales[i++], &status);
 149             }
 150             _installedLocales[i] = NULL;
 151             _installedLocalesCount = localeCount;
 152             ucln_common_registerCleanup(UCLN_COMMON_ULOC, uloc_cleanup);
 153         }
 154     }
 155 }
 156
 157 static void _load_installedLocales()
 158 {
 159     umtx_initOnce(_installedLocalesInitOnce, &loadInstalledLocales);
 160 }
 161
 162 U_CAPI const char* U_EXPORT2
 163 uloc_getAvailable(int32_t offset)
 164 {
 165
 166     _load_installedLocales();
 167
 168     if (offset > _installedLocalesCount)
 169         return NULL;
 170     return _installedLocales[offset];
 171 }
 172
 173 U_CAPI int32_t  U_EXPORT2
 174 uloc_countAvailable()
 175 {
 176     _load_installedLocales();
 177     return _installedLocalesCount;
 178 }
 179