libstdc++-v3/src/locale.cc

   1 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
   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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  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
  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   // Mutex object for cache access
  41   static __glibcxx_mutex_define_initialized(locale_cache_mutex);
  42 }
  43
  44 // XXX GLIBCXX_ABI Deprecated
  45 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
  46 # define _GLIBCXX_LOC_ID(mangled) extern std::locale::id mangled
  47 _GLIBCXX_LOC_ID (_ZNSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE);
  48 _GLIBCXX_LOC_ID (_ZNSt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE2idE);
  49 _GLIBCXX_LOC_ID (_ZNSt9money_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE);
  50 _GLIBCXX_LOC_ID (_ZNSt9money_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE2idE);
  51 # ifdef _GLIBCXX_USE_WCHAR_T
  52 _GLIBCXX_LOC_ID (_ZNSt7num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE2idE);
  53 _GLIBCXX_LOC_ID (_ZNSt7num_putIwSt19ostreambuf_iteratorIwSt11char_traitsIwEEE2idE);
  54 _GLIBCXX_LOC_ID (_ZNSt9money_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE2idE);
  55 _GLIBCXX_LOC_ID (_ZNSt9money_putIwSt19ostreambuf_iteratorIwSt11char_traitsIwEEE2idE);
  56 # endif
  57 #endif
  58
  59 _GLIBCXX_BEGIN_NAMESPACE(std)
  60
  61   // Definitions for static const data members of locale.
  62   const locale::category        locale::none;
  63   const locale::category        locale::ctype;
  64   const locale::category        locale::numeric;
  65   const locale::category        locale::collate;
  66   const locale::category        locale::time;
  67   const locale::category        locale::monetary;
  68   const locale::category        locale::messages;
  69   const locale::category        locale::all;
  70
  71   // These are no longer exported.
  72   locale::_Impl*                locale::_S_classic;
  73   locale::_Impl*                locale::_S_global;
  74   const size_t                  locale::_S_categories_size;
  75
  76 #ifdef __GTHREADS
  77   __gthread_once_t              locale::_S_once = __GTHREAD_ONCE_INIT;
  78 #endif
  79
  80   locale::locale(const locale& __other) throw()
  81   : _M_impl(__other._M_impl)
  82   { _M_impl->_M_add_reference(); }
  83
  84   // This is used to initialize global and classic locales, and
  85   // assumes that the _Impl objects are constructed correctly.
  86   // The lack of a reference increment is intentional.
  87   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
  88   { }
  89
  90   locale::~locale() throw()
  91   { _M_impl->_M_remove_reference(); }
  92
  93   bool
  94   locale::operator==(const locale& __rhs) const throw()
  95   {
  96     // Deal first with the common cases, fast to process: refcopies,
  97     // unnamed (i.e., !_M_names[0]), "simple" (!_M_names[1] => all the
  98     // categories same name, i.e., _M_names[0]). Otherwise fall back
  99     // to the general locale::name().
 100     bool __ret;
 101     if (_M_impl == __rhs._M_impl)
 102       __ret = true;
 103     else if (!_M_impl->_M_names[0] || !__rhs._M_impl->_M_names[0]
 104              || std::strcmp(_M_impl->_M_names[0],
 105                             __rhs._M_impl->_M_names[0]) != 0)
 106       __ret = false;
 107     else if (!_M_impl->_M_names[1] && !__rhs._M_impl->_M_names[1])
 108       __ret = true;
 109     else
 110       __ret = this->name() == __rhs.name();
 111     return __ret;
 112   }
 113
 114   const locale&
 115   locale::operator=(const locale& __other) throw()
 116   {
 117     __other._M_impl->_M_add_reference();
 118     _M_impl->_M_remove_reference();
 119     _M_impl = __other._M_impl;
 120     return *this;
 121   }
 122
 123   string
 124   locale::name() const
 125   {
 126     string __ret;
 127     if (!_M_impl->_M_names[0])
 128       __ret = '*';
 129     else if (_M_impl->_M_check_same_name())
 130       __ret = _M_impl->_M_names[0];
 131     else
 132       {
 133         __ret.reserve(128);
 134         __ret += _S_categories[0];
 135         __ret += '=';
 136         __ret += _M_impl->_M_names[0];
 137         for (size_t __i = 1; __i < _S_categories_size; ++__i)
 138           {
 139             __ret += ';';
 140             __ret += _S_categories[__i];
 141             __ret += '=';
 142             __ret += _M_impl->_M_names[__i];
 143           }
 144       }
 145     return __ret;
 146   }
 147
 148   locale::category
 149   locale::_S_normalize_category(category __cat)
 150   {
 151     int __ret = 0;
 152     if (__cat == none || (__cat & all) && !(__cat & ~all))
 153       __ret = __cat;
 154     else
 155       {
 156         // NB: May be a C-style "LC_ALL" category; convert.
 157         switch (__cat)
 158           {
 159           case LC_COLLATE:
 160             __ret = collate;
 161             break;
 162           case LC_CTYPE:
 163             __ret = ctype;
 164             break;
 165           case LC_MONETARY:
 166             __ret = monetary;
 167             break;
 168           case LC_NUMERIC:
 169             __ret = numeric;
 170             break;
 171           case LC_TIME:
 172             __ret = time;
 173             break;
 174 #ifdef _GLIBCXX_HAVE_LC_MESSAGES
 175           case LC_MESSAGES:
 176             __ret = messages;
 177             break;
 178 #endif
 179           case LC_ALL:
 180             __ret = all;
 181             break;
 182           default:
 183             __throw_runtime_error(__N("locale::_S_normalize_category "
 184                                   "category not found"));
 185           }
 186       }
 187     return __ret;
 188   }
 189
 190   // locale::facet
 191   __c_locale locale::facet::_S_c_locale;
 192
 193   const char locale::facet::_S_c_name[2] = "C";
 194
 195 #ifdef __GTHREADS
 196   __gthread_once_t locale::facet::_S_once = __GTHREAD_ONCE_INIT;
 197 #endif
 198
 199   void
 200   locale::facet::_S_initialize_once()
 201   {
 202     // Initialize the underlying locale model.
 203     _S_create_c_locale(_S_c_locale, _S_c_name);
 204   }
 205
 206   __c_locale
 207   locale::facet::_S_get_c_locale()
 208   {
 209 #ifdef __GHTREADS
 210     if (__gthread_active_p())
 211       __gthread_once(&_S_once, _S_initialize_once);
 212     else
 213 #endif
 214       {
 215         if (!_S_c_locale)
 216           _S_initialize_once();
 217       }
 218     return _S_c_locale;
 219   }
 220
 221   const char*
 222   locale::facet::_S_get_c_name()
 223   { return _S_c_name; }
 224
 225   locale::facet::
 226   ~facet() { }
 227
 228   // locale::_Impl
 229   locale::_Impl::
 230   ~_Impl() throw()
 231   {
 232     if (_M_facets)
 233       for (size_t __i = 0; __i < _M_facets_size; ++__i)
 234         if (_M_facets[__i])
 235           _M_facets[__i]->_M_remove_reference();
 236     delete [] _M_facets;
 237
 238     if (_M_caches)
 239       for (size_t __i = 0; __i < _M_facets_size; ++__i)
 240         if (_M_caches[__i])
 241           _M_caches[__i]->_M_remove_reference();
 242     delete [] _M_caches;
 243
 244     if (_M_names)
 245       for (size_t __i = 0; __i < _S_categories_size; ++__i)
 246         delete [] _M_names[__i];
 247     delete [] _M_names;
 248   }
 249
 250   // Clone existing _Impl object.
 251   locale::_Impl::
 252   _Impl(const _Impl& __imp, size_t __refs)
 253   : _M_refcount(__refs), _M_facets(0), _M_facets_size(__imp._M_facets_size),
 254   _M_caches(0), _M_names(0)
 255   {
 256     try
 257       {
 258         _M_facets = new const facet*[_M_facets_size];
 259         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 260           {
 261             _M_facets[__i] = __imp._M_facets[__i];
 262             if (_M_facets[__i])
 263               _M_facets[__i]->_M_add_reference();
 264           }
 265         _M_caches = new const facet*[_M_facets_size];
 266         for (size_t __j = 0; __j < _M_facets_size; ++__j)
 267           {
 268             _M_caches[__j] = __imp._M_caches[__j];
 269             if (_M_caches[__j])
 270               _M_caches[__j]->_M_add_reference();
 271           }
 272         _M_names = new char*[_S_categories_size];
 273         for (size_t __k = 0; __k < _S_categories_size; ++__k)
 274           _M_names[__k] = 0;
 275
 276         // Name the categories.
 277         for (size_t __l = 0; (__l < _S_categories_size
 278                               && __imp._M_names[__l]); ++__l)
 279           {
 280             const size_t __len = std::strlen(__imp._M_names[__l]) + 1;
 281             _M_names[__l] = new char[__len];
 282             std::memcpy(_M_names[__l], __imp._M_names[__l], __len);
 283           }
 284       }
 285     catch(...)
 286       {
 287         this->~_Impl();
 288         __throw_exception_again;
 289       }
 290   }
 291
 292   void
 293   locale::_Impl::
 294   _M_replace_category(const _Impl* __imp,
 295                       const locale::id* const* __idpp)
 296   {
 297     for (; *__idpp; ++__idpp)
 298       _M_replace_facet(__imp, *__idpp);
 299   }
 300
 301   void
 302   locale::_Impl::
 303   _M_replace_facet(const _Impl* __imp, const locale::id* __idp)
 304   {
 305     size_t __index = __idp->_M_id();
 306     if ((__index > (__imp->_M_facets_size - 1))
 307         || !__imp->_M_facets[__index])
 308       __throw_runtime_error(__N("locale::_Impl::_M_replace_facet"));
 309     _M_install_facet(__idp, __imp->_M_facets[__index]);
 310   }
 311
 312   void
 313   locale::_Impl::
 314   _M_install_facet(const locale::id* __idp, const facet* __fp)
 315   {
 316     if (__fp)
 317       {
 318         size_t __index = __idp->_M_id();
 319
 320         // Check size of facet vector to ensure adequate room.
 321         if (__index > _M_facets_size - 1)
 322           {
 323             const size_t __new_size = __index + 4;
 324
 325             // New facet array.
 326             const facet** __oldf = _M_facets;
 327             const facet** __newf;
 328             __newf = new const facet*[__new_size];
 329             for (size_t __i = 0; __i < _M_facets_size; ++__i)
 330               __newf[__i] = _M_facets[__i];
 331             for (size_t __l = _M_facets_size; __l < __new_size; ++__l)
 332               __newf[__l] = 0;
 333
 334             // New cache array.
 335             const facet** __oldc = _M_caches;
 336             const facet** __newc;
 337             try
 338               {
 339                 __newc = new const facet*[__new_size];
 340               }
 341             catch(...)
 342               {
 343                 delete [] __newf;
 344                 __throw_exception_again;
 345               }
 346             for (size_t __j = 0; __j < _M_facets_size; ++__j)
 347               __newc[__j] = _M_caches[__j];
 348             for (size_t __k = _M_facets_size; __k < __new_size; ++__k)
 349               __newc[__k] = 0;
 350
 351             _M_facets_size = __new_size;
 352             _M_facets = __newf;
 353             _M_caches = __newc;
 354             delete [] __oldf;
 355             delete [] __oldc;
 356           }
 357
 358         __fp->_M_add_reference();
 359         const facet*& __fpr = _M_facets[__index];
 360         if (__fpr)
 361           {
 362             // Replacing an existing facet. Order matters.
 363             __fpr->_M_remove_reference();
 364             __fpr = __fp;
 365           }
 366         else
 367           {
 368             // Installing a newly created facet into an empty
 369             // _M_facets container, say a newly-constructed,
 370             // swanky-fresh _Impl.
 371             _M_facets[__index] = __fp;
 372           }
 373
 374         // Ideally, it would be nice to only remove the caches that
 375         // are now incorrect. However, some of the caches depend on
 376         // multiple facets, and we only know about one facet
 377         // here. It's no great loss: the first use of the new facet
 378         // will create a new, correctly cached facet anyway.
 379         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 380           {
 381             const facet* __cpr = _M_caches[__i];
 382             if (__cpr)
 383               {
 384                 __cpr->_M_remove_reference();
 385                 _M_caches[__i] = 0;
 386               }
 387           }
 388       }
 389   }
 390
 391   void
 392   locale::_Impl::
 393   _M_install_cache(const facet* __cache, size_t __index)
 394   {
 395     __gnu_cxx::lock sentry(__gnu_internal::locale_cache_mutex);
 396     if (_M_caches[__index] != 0)
 397       {
 398         // Some other thread got in first.
 399         delete __cache;
 400       }
 401     else
 402       {
 403         __cache->_M_add_reference();
 404         _M_caches[__index] = __cache;
 405       }
 406   }
 407
 408   // locale::id
 409   // Definitions for static const data members of locale::id
 410   _Atomic_word locale::id::_S_refcount;  // init'd to 0 by linker
 411
 412   size_t
 413   locale::id::_M_id() const
 414   {
 415     if (!_M_index)
 416       {
 417         // XXX GLIBCXX_ABI Deprecated
 418 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
 419         locale::id *f = 0;
 420 # define _GLIBCXX_SYNC_ID(facet, mangled) \
 421         if (this == &::mangled)                         \
 422           f = &facet::id
 423         _GLIBCXX_SYNC_ID (num_get<char>, _ZNSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE);
 424         _GLIBCXX_SYNC_ID (num_put<char>, _ZNSt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE2idE);
 425         _GLIBCXX_SYNC_ID (money_get<char>, _ZNSt9money_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE);
 426         _GLIBCXX_SYNC_ID (money_put<char>, _ZNSt9money_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE2idE);
 427 # ifdef _GLIBCXX_USE_WCHAR_T
 428         _GLIBCXX_SYNC_ID (num_get<wchar_t>, _ZNSt7num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE2idE);
 429         _GLIBCXX_SYNC_ID (num_put<wchar_t>, _ZNSt7num_putIwSt19ostreambuf_iteratorIwSt11char_traitsIwEEE2idE);
 430         _GLIBCXX_SYNC_ID (money_get<wchar_t>, _ZNSt9money_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE2idE);
 431         _GLIBCXX_SYNC_ID (money_put<wchar_t>, _ZNSt9money_putIwSt19ostreambuf_iteratorIwSt11char_traitsIwEEE2idE);
 432 # endif
 433         if (f)
 434           _M_index = 1 + f->_M_id();
 435         else
 436 #endif
 437           _M_index = 1 + __gnu_cxx::__exchange_and_add(&_S_refcount, 1);
 438       }
 439     return _M_index - 1;
 440   }
 441
 442 _GLIBCXX_END_NAMESPACE