libstdc++-v3/src/locale_init.cc

   1 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   2 // Free Software Foundation, Inc.
   3 //
   4 // This file is part of the GNU ISO C++ Library.  This library is free
   5 // software; you can redistribute it and/or modify it under the
   6 // terms of the GNU General Public License as published by the
   7 // Free Software Foundation; either version 2, or (at your option)
   8 // any later version.
   9
  10 // This library is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License along
  16 // with this library; see the file COPYING.  If not, write to the Free
  17 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  18 // USA.
  19
  20 // As a special exception, you may use this file as part of a free software
  21 // library without restriction.  Specifically, if other files instantiate
  22 // templates or use macros or inline functions from this file, or you compile
  23 // this file and link it with other files to produce an executable, this
  24 // file does not by itself cause the resulting executable to be covered by
  25 // the GNU General Public License.  This exception does not however
  26 // invalidate any other reasons why the executable file might be covered by
  27 // the GNU General Public License.
  28
  29 #include <clocale>
  30 #include <cstring>
  31 #include <cstdlib>     // For getenv, free.
  32 #include <cctype>
  33 #include <cwctype>     // For towupper, etc.
  34 #include <locale>
  35 #include <bits/atomicity.h>
  36 #include <bits/concurrence.h>
  37
  38 namespace __gnu_internal
  39 {
  40   // Defined in globals.cc.
  41   extern std::locale            c_locale;
  42   extern std::locale::_Impl     c_locale_impl;
  43
  44   extern std::locale::facet* facet_vec[_GLIBCXX_NUM_FACETS];
  45   extern char* name_vec[6 + _GLIBCXX_NUM_CATEGORIES];
  46   extern char name_c[6 + _GLIBCXX_NUM_CATEGORIES][2];
  47
  48   extern std::ctype<char>                        ctype_c;
  49   extern std::collate<char>                      collate_c;
  50   extern std::numpunct<char>                     numpunct_c;
  51   extern std::num_get<char>                      num_get_c;
  52   extern std::num_put<char>                      num_put_c;
  53   extern std::codecvt<char, char, mbstate_t>     codecvt_c;
  54   extern std::moneypunct<char, false>            moneypunct_cf;
  55   extern std::moneypunct<char, true>             moneypunct_ct;
  56   extern std::money_get<char>                    money_get_c;
  57   extern std::money_put<char>                    money_put_c;
  58   extern std::__timepunct<char>                  timepunct_c;
  59   extern std::time_get<char>                     time_get_c;
  60   extern std::time_put<char>                     time_put_c;
  61   extern std::messages<char>                     messages_c;
  62 #ifdef  _GLIBCXX_USE_WCHAR_T
  63   extern std::ctype<wchar_t>                     ctype_w;
  64   extern std::collate<wchar_t>                   collate_w;
  65   extern std::numpunct<wchar_t>                  numpunct_w;
  66   extern std::num_get<wchar_t>                   num_get_w;
  67   extern std::num_put<wchar_t>                   num_put_w;
  68   extern std::codecvt<wchar_t, char, mbstate_t>  codecvt_w;
  69   extern std::moneypunct<wchar_t, false>         moneypunct_wf;
  70   extern std::moneypunct<wchar_t, true>          moneypunct_wt;
  71   extern std::money_get<wchar_t>                 money_get_w;
  72   extern std::money_put<wchar_t>                 money_put_w;
  73   extern std::__timepunct<wchar_t>               timepunct_w;
  74   extern std::time_get<wchar_t>                  time_get_w;
  75   extern std::time_put<wchar_t>                  time_put_w;
  76   extern std::messages<wchar_t>                  messages_w;
  77 #endif
  78
  79   // And the caches....
  80   extern std::locale::facet* cache_vec[_GLIBCXX_NUM_FACETS];
  81   extern std::__numpunct_cache<char>             numpunct_cache_c;
  82   extern std::__moneypunct_cache<char, false>    moneypunct_cache_cf;
  83   extern std::__moneypunct_cache<char, true>     moneypunct_cache_ct;
  84   extern std::__timepunct_cache<char>            timepunct_cache_c;
  85 #ifdef  _GLIBCXX_USE_WCHAR_T
  86   extern std::__numpunct_cache<wchar_t>          numpunct_cache_w;
  87   extern std::__moneypunct_cache<wchar_t, false> moneypunct_cache_wf;
  88   extern std::__moneypunct_cache<wchar_t, true>  moneypunct_cache_wt;
  89   extern std::__timepunct_cache<wchar_t>         timepunct_cache_w;
  90 #endif
  91
  92   // Mutex object for locale initialization.
  93   __glibcxx_mutex_define_initialized(locale_mutex);
  94 } // namespace __gnu_internal
  95
  96 namespace std
  97 {
  98   using namespace __gnu_internal;
  99
 100   locale::locale() throw() : _M_impl(0)
 101   {
 102     _S_initialize();
 103     __gnu_cxx::lock sentry(__gnu_internal::locale_mutex);
 104     _S_global->_M_add_reference();
 105     _M_impl = _S_global;
 106   }
 107
 108   locale
 109   locale::global(const locale& __other)
 110   {
 111     _S_initialize();
 112     _Impl* __old;
 113     {
 114       __gnu_cxx::lock sentry(__gnu_internal::locale_mutex);
 115       __old = _S_global;
 116       __other._M_impl->_M_add_reference();
 117       _S_global = __other._M_impl;
 118       const string __other_name = __other.name();
 119       if (__other_name != "*")
 120         setlocale(LC_ALL, __other_name.c_str());
 121     }
 122
 123     // Reference count sanity check: one reference removed for the
 124     // subsition of __other locale, one added by return-by-value. Net
 125     // difference: zero. When the returned locale object's destrutor
 126     // is called, then the reference count is decremented and possibly
 127     // destroyed.
 128     return locale(__old);
 129   }
 130
 131   const locale&
 132   locale::classic()
 133   {
 134     _S_initialize();
 135     return c_locale;
 136   }
 137
 138   void
 139   locale::_S_initialize_once()
 140   {
 141     // 2 references.
 142     // One reference for _S_classic, one for _S_global
 143     _S_classic = new (&c_locale_impl) _Impl(2);
 144     _S_global = _S_classic;
 145     new (&c_locale) locale(_S_classic);
 146   }
 147
 148   void
 149   locale::_S_initialize()
 150   {
 151 #ifdef __GTHREADS
 152     if (__gthread_active_p())
 153       __gthread_once(&_S_once, _S_initialize_once);
 154 #endif
 155     if (!_S_classic)
 156       _S_initialize_once();
 157   }
 158
 159   // Definitions for static const data members of locale::_Impl
 160   const locale::id* const
 161   locale::_Impl::_S_id_ctype[] =
 162   {
 163     &std::ctype<char>::id,
 164     &codecvt<char, char, mbstate_t>::id,
 165 #ifdef _GLIBCXX_USE_WCHAR_T
 166     &std::ctype<wchar_t>::id,
 167     &codecvt<wchar_t, char, mbstate_t>::id,
 168 #endif
 169     0
 170   };
 171
 172   const locale::id* const
 173   locale::_Impl::_S_id_numeric[] =
 174   {
 175     &num_get<char>::id,
 176     &num_put<char>::id,
 177     &numpunct<char>::id,
 178 #ifdef _GLIBCXX_USE_WCHAR_T
 179     &num_get<wchar_t>::id,
 180     &num_put<wchar_t>::id,
 181     &numpunct<wchar_t>::id,
 182 #endif
 183     0
 184   };
 185
 186   const locale::id* const
 187   locale::_Impl::_S_id_collate[] =
 188   {
 189     &std::collate<char>::id,
 190 #ifdef _GLIBCXX_USE_WCHAR_T
 191     &std::collate<wchar_t>::id,
 192 #endif
 193     0
 194   };
 195
 196   const locale::id* const
 197   locale::_Impl::_S_id_time[] =
 198   {
 199     &__timepunct<char>::id,
 200     &time_get<char>::id,
 201     &time_put<char>::id,
 202 #ifdef _GLIBCXX_USE_WCHAR_T
 203     &__timepunct<wchar_t>::id,
 204     &time_get<wchar_t>::id,
 205     &time_put<wchar_t>::id,
 206 #endif
 207     0
 208   };
 209
 210   const locale::id* const
 211   locale::_Impl::_S_id_monetary[] =
 212   {
 213     &money_get<char>::id,
 214     &money_put<char>::id,
 215     &moneypunct<char, false>::id,
 216     &moneypunct<char, true >::id,
 217 #ifdef _GLIBCXX_USE_WCHAR_T
 218     &money_get<wchar_t>::id,
 219     &money_put<wchar_t>::id,
 220     &moneypunct<wchar_t, false>::id,
 221     &moneypunct<wchar_t, true >::id,
 222 #endif
 223     0
 224   };
 225
 226   const locale::id* const
 227   locale::_Impl::_S_id_messages[] =
 228   {
 229     &std::messages<char>::id,
 230 #ifdef _GLIBCXX_USE_WCHAR_T
 231     &std::messages<wchar_t>::id,
 232 #endif
 233     0
 234   };
 235
 236   const locale::id* const* const
 237   locale::_Impl::_S_facet_categories[] =
 238   {
 239     // Order must match the decl order in class locale.
 240     locale::_Impl::_S_id_ctype,
 241     locale::_Impl::_S_id_numeric,
 242     locale::_Impl::_S_id_collate,
 243     locale::_Impl::_S_id_time,
 244     locale::_Impl::_S_id_monetary,
 245     locale::_Impl::_S_id_messages,
 246     0
 247   };
 248
 249   // Construct "C" _Impl.
 250   locale::_Impl::
 251   _Impl(size_t __refs) throw()
 252   : _M_refcount(__refs), _M_facets(0), _M_facets_size(_GLIBCXX_NUM_FACETS),
 253   _M_caches(0), _M_names(0)
 254   {
 255     _M_facets = new (&facet_vec) const facet*[_M_facets_size];
 256     _M_caches = new (&cache_vec) const facet*[_M_facets_size];
 257     for (size_t __i = 0; __i < _M_facets_size; ++__i)
 258       _M_facets[__i] = _M_caches[__i] = 0;
 259
 260     // Name the categories.
 261     _M_names = new (&name_vec) char*[_S_categories_size];
 262     _M_names[0] = new (&name_c[0]) char[2];
 263     std::memcpy(_M_names[0], locale::facet::_S_get_c_name(), 2);
 264     for (size_t __j = 1; __j < _S_categories_size; ++__j)
 265       _M_names[__j] = 0;
 266
 267     // This is needed as presently the C++ version of "C" locales
 268     // != data in the underlying locale model for __timepunct,
 269     // numpunct, and moneypunct. Also, the "C" locales must be
 270     // constructed in a way such that they are pre-allocated.
 271     // NB: Set locale::facets(ref) count to one so that each individual
 272     // facet is not destroyed when the locale (and thus locale::_Impl) is
 273     // destroyed.
 274     _M_init_facet(new (&ctype_c) std::ctype<char>(0, false, 1));
 275     _M_init_facet(new (&codecvt_c) codecvt<char, char, mbstate_t>(1));
 276
 277     typedef __numpunct_cache<char> num_cache_c;
 278     num_cache_c* __npc = new (&numpunct_cache_c) num_cache_c(2);
 279     _M_init_facet(new (&numpunct_c) numpunct<char>(__npc, 1));
 280
 281     _M_init_facet(new (&num_get_c) num_get<char>(1));
 282     _M_init_facet(new (&num_put_c) num_put<char>(1));
 283     _M_init_facet(new (&collate_c) std::collate<char>(1));
 284
 285     typedef __moneypunct_cache<char, false> money_cache_cf;
 286     typedef __moneypunct_cache<char, true> money_cache_ct;
 287     money_cache_cf* __mpcf = new (&moneypunct_cache_cf) money_cache_cf(2);
 288     _M_init_facet(new (&moneypunct_cf) moneypunct<char, false>(__mpcf, 1));
 289     money_cache_ct* __mpct = new (&moneypunct_cache_ct) money_cache_ct(2);
 290     _M_init_facet(new (&moneypunct_ct) moneypunct<char, true>(__mpct, 1));
 291
 292     _M_init_facet(new (&money_get_c) money_get<char>(1));
 293     _M_init_facet(new (&money_put_c) money_put<char>(1));
 294
 295     typedef __timepunct_cache<char> time_cache_c;
 296     time_cache_c* __tpc = new (&timepunct_cache_c) time_cache_c(2);
 297     _M_init_facet(new (&timepunct_c) __timepunct<char>(__tpc, 1));
 298
 299     _M_init_facet(new (&time_get_c) time_get<char>(1));
 300     _M_init_facet(new (&time_put_c) time_put<char>(1));
 301     _M_init_facet(new (&messages_c) std::messages<char>(1));
 302
 303 #ifdef  _GLIBCXX_USE_WCHAR_T
 304     _M_init_facet(new (&ctype_w) std::ctype<wchar_t>(1));
 305     _M_init_facet(new (&codecvt_w) codecvt<wchar_t, char, mbstate_t>(1));
 306
 307     typedef __numpunct_cache<wchar_t> num_cache_w;
 308     num_cache_w* __npw = new (&numpunct_cache_w) num_cache_w(2);
 309     _M_init_facet(new (&numpunct_w) numpunct<wchar_t>(__npw, 1));
 310
 311     _M_init_facet(new (&num_get_w) num_get<wchar_t>(1));
 312     _M_init_facet(new (&num_put_w) num_put<wchar_t>(1));
 313     _M_init_facet(new (&collate_w) std::collate<wchar_t>(1));
 314
 315     typedef __moneypunct_cache<wchar_t, false> money_cache_wf;
 316     typedef __moneypunct_cache<wchar_t, true> money_cache_wt;
 317     money_cache_wf* __mpwf = new (&moneypunct_cache_wf) money_cache_wf(2);
 318     _M_init_facet(new (&moneypunct_wf) moneypunct<wchar_t, false>(__mpwf, 1));
 319     money_cache_wt* __mpwt = new (&moneypunct_cache_wt) money_cache_wt(2);
 320     _M_init_facet(new (&moneypunct_wt) moneypunct<wchar_t, true>(__mpwt, 1));
 321
 322     _M_init_facet(new (&money_get_w) money_get<wchar_t>(1));
 323     _M_init_facet(new (&money_put_w) money_put<wchar_t>(1));
 324
 325     typedef __timepunct_cache<wchar_t> time_cache_w;
 326     time_cache_w* __tpw = new (&timepunct_cache_w) time_cache_w(2);
 327     _M_init_facet(new (&timepunct_w) __timepunct<wchar_t>(__tpw, 1));
 328
 329     _M_init_facet(new (&time_get_w) time_get<wchar_t>(1));
 330     _M_init_facet(new (&time_put_w) time_put<wchar_t>(1));
 331     _M_init_facet(new (&messages_w) std::messages<wchar_t>(1));
 332 #endif
 333
 334     // This locale is safe to pre-cache, after all the facets have
 335     // been created and installed.
 336     _M_caches[numpunct<char>::id._M_id()] = __npc;
 337     _M_caches[moneypunct<char, false>::id._M_id()] = __mpcf;
 338     _M_caches[moneypunct<char, true>::id._M_id()] = __mpct;
 339     _M_caches[__timepunct<char>::id._M_id()] = __tpc;
 340 #ifdef  _GLIBCXX_USE_WCHAR_T
 341     _M_caches[numpunct<wchar_t>::id._M_id()] = __npw;
 342     _M_caches[moneypunct<wchar_t, false>::id._M_id()] = __mpwf;
 343     _M_caches[moneypunct<wchar_t, true>::id._M_id()] = __mpwt;
 344     _M_caches[__timepunct<wchar_t>::id._M_id()] = __tpw;
 345 #endif
 346   }
 347 } // namespace std