libstdc++-v3/src/locale.cc

   1 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
   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
  32 #include <cctype>
  33 #include <cwctype>     // For towupper, etc.
  34 #include <locale>
  35 #include <bits/atomicity.h>
  36
  37 namespace std
  38 {
  39   // Definitions for static const data members of locale.
  40   const locale::category        locale::none;
  41   const locale::category        locale::ctype;
  42   const locale::category        locale::numeric;
  43   const locale::category        locale::collate;
  44   const locale::category        locale::time;
  45   const locale::category        locale::monetary;
  46   const locale::category        locale::messages;
  47   const locale::category        locale::all;
  48
  49   // These are no longer exported.
  50   locale::_Impl*                locale::_S_classic;
  51   locale::_Impl*                locale::_S_global;
  52   const size_t                  locale::_S_categories_size;
  53
  54 #ifdef __GTHREADS
  55   __gthread_once_t              locale::_S_once = __GTHREAD_ONCE_INIT;
  56 #endif
  57
  58   locale::locale(const locale& __other) throw()
  59   { (_M_impl = __other._M_impl)->_M_add_reference(); }
  60
  61   // This is used to initialize global and classic locales, and
  62   // assumes that the _Impl objects are constructed correctly.
  63   // The lack of a reference increment is intentional.
  64   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
  65   { }
  66
  67   locale::~locale() throw()
  68   { _M_impl->_M_remove_reference(); }
  69
  70   bool
  71   locale::operator==(const locale& __rhs) const throw()
  72   {
  73     string __name = this->name();
  74     return (_M_impl == __rhs._M_impl
  75             || (__name != "*" && __name == __rhs.name()));
  76   }
  77
  78   const locale&
  79   locale::operator=(const locale& __other) throw()
  80   {
  81     __other._M_impl->_M_add_reference();
  82     _M_impl->_M_remove_reference();
  83     _M_impl = __other._M_impl;
  84     return *this;
  85   }
  86
  87   string
  88   locale::name() const
  89   {
  90     string __ret;
  91     if (_M_impl->_M_check_same_name())
  92       __ret = _M_impl->_M_names[0];
  93     else
  94       {
  95         __ret += _S_categories[0];
  96         __ret += '=';
  97         __ret += _M_impl->_M_names[0];
  98         for (size_t __i = 1; __i < _S_categories_size; ++__i)
  99           {
 100             __ret += ';';
 101             __ret += _S_categories[__i];
 102             __ret += '=';
 103             __ret += _M_impl->_M_names[__i];
 104           }
 105       }
 106     return __ret;
 107   }
 108
 109   locale::category
 110   locale::_S_normalize_category(category __cat)
 111   {
 112     int __ret = 0;
 113     if (__cat == none || (__cat & all) && !(__cat & ~all))
 114       __ret = __cat;
 115     else
 116       {
 117         // NB: May be a C-style "LC_ALL" category; convert.
 118         switch (__cat)
 119           {
 120           case LC_COLLATE:
 121             __ret = collate;
 122             break;
 123           case LC_CTYPE:
 124             __ret = ctype;
 125             break;
 126           case LC_MONETARY:
 127             __ret = monetary;
 128             break;
 129           case LC_NUMERIC:
 130             __ret = numeric;
 131             break;
 132           case LC_TIME:
 133             __ret = time;
 134             break;
 135 #ifdef _GLIBCXX_HAVE_LC_MESSAGES
 136           case LC_MESSAGES:
 137             __ret = messages;
 138             break;
 139 #endif
 140           case LC_ALL:
 141             __ret = all;
 142             break;
 143           default:
 144             __throw_runtime_error("locale::_S_normalize_category "
 145                                   "category not found");
 146           }
 147       }
 148     return __ret;
 149   }
 150
 151   // locale::facet
 152   __c_locale locale::facet::_S_c_locale;
 153
 154   const char locale::facet::_S_c_name[2] = "C";
 155
 156 #ifdef __GTHREADS
 157   __gthread_once_t locale::facet::_S_once = __GTHREAD_ONCE_INIT;
 158 #endif
 159
 160   void
 161   locale::facet::_S_initialize_once()
 162   {
 163     // Initialize the underlying locale model.
 164     _S_create_c_locale(_S_c_locale, _S_c_name);
 165   }
 166
 167   __c_locale
 168   locale::facet::_S_get_c_locale()
 169   {
 170 #ifdef __GHTREADS
 171     if (__gthread_active_p())
 172       __gthread_once(&_S_once, _S_initialize_once);
 173     else
 174 #endif
 175       {
 176         if (!_S_c_locale)
 177           _S_initialize_once();
 178       }
 179     return _S_c_locale;
 180   }
 181
 182   const char*
 183   locale::facet::_S_get_c_name()
 184   { return _S_c_name; }
 185
 186   locale::facet::
 187   ~facet() { }
 188
 189   // locale::_Impl
 190   locale::_Impl::
 191   ~_Impl() throw()
 192   {
 193     if (_M_facets)
 194       for (size_t __i = 0; __i < _M_facets_size; ++__i)
 195         if (_M_facets[__i])
 196           _M_facets[__i]->_M_remove_reference();
 197     delete [] _M_facets;
 198
 199     if (_M_caches)
 200       for (size_t __i = 0; __i < _M_facets_size; ++__i)
 201         if (_M_caches[__i])
 202           _M_caches[__i]->_M_remove_reference();
 203     delete [] _M_caches;
 204
 205     if (_M_names)
 206       for (size_t __i = 0; __i < _S_categories_size; ++__i)
 207         delete [] _M_names[__i];
 208     delete [] _M_names;
 209   }
 210
 211   // Clone existing _Impl object.
 212   locale::_Impl::
 213   _Impl(const _Impl& __imp, size_t __refs)
 214   : _M_refcount(__refs), _M_facets_size(__imp._M_facets_size)
 215   {
 216     _M_facets = _M_caches = 0;
 217     _M_names = 0;
 218     try
 219       {
 220         _M_facets = new const facet*[_M_facets_size];
 221         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 222           {
 223             _M_facets[__i] = __imp._M_facets[__i];
 224             if (_M_facets[__i])
 225               _M_facets[__i]->_M_add_reference();
 226           }
 227         _M_caches = new const facet*[_M_facets_size];
 228         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 229           {
 230             _M_caches[__i] = __imp._M_caches[__i];
 231             if (_M_caches[__i])
 232               _M_caches[__i]->_M_add_reference();
 233           }
 234         _M_names = new char*[_S_categories_size];
 235         for (size_t __i = 0; __i < _S_categories_size; ++__i)
 236           _M_names[__i] = 0;
 237
 238         // Name all the categories.
 239         for (size_t __i = 0; __i < _S_categories_size; ++__i)
 240           {
 241             char* __new = new char[std::strlen(__imp._M_names[__i]) + 1];
 242             std::strcpy(__new, __imp._M_names[__i]);
 243             _M_names[__i] = __new;
 244           }
 245       }
 246     catch(...)
 247       {
 248         this->~_Impl();
 249         __throw_exception_again;
 250       }
 251   }
 252
 253   void
 254   locale::_Impl::
 255   _M_replace_category(const _Impl* __imp, const locale::id* const* __idpp)
 256   {
 257     for (; *__idpp; ++__idpp)
 258       _M_replace_facet(__imp, *__idpp);
 259   }
 260
 261   void
 262   locale::_Impl::
 263   _M_replace_facet(const _Impl* __imp, const locale::id* __idp)
 264   {
 265     size_t __index = __idp->_M_id();
 266     if ((__index > (__imp->_M_facets_size - 1)) || !__imp->_M_facets[__index])
 267       __throw_runtime_error("locale::_Impl::_M_replace_facet");
 268     _M_install_facet(__idp, __imp->_M_facets[__index]);
 269   }
 270
 271   void
 272   locale::_Impl::
 273   _M_install_facet(const locale::id* __idp, const facet* __fp)
 274   {
 275     if (__fp)
 276       {
 277         size_t __index = __idp->_M_id();
 278
 279         // Check size of facet vector to ensure adequate room.
 280         if (__index > _M_facets_size - 1)
 281           {
 282             const size_t __new_size = __index + 4;
 283
 284             // New facet array.
 285             const facet** __oldf = _M_facets;
 286             const facet** __newf;
 287             __newf = new const facet*[__new_size];
 288             for (size_t __i = 0; __i < _M_facets_size; ++__i)
 289               __newf[__i] = _M_facets[__i];
 290             for (size_t __i2 = _M_facets_size; __i2 < __new_size; ++__i2)
 291               __newf[__i2] = 0;
 292
 293             // New cache array.
 294             const facet** __oldc = _M_caches;
 295             const facet** __newc;
 296             try
 297               {
 298                 __newc = new const facet*[__new_size];
 299               }
 300             catch(...)
 301               {
 302                 delete [] __newf;
 303                 __throw_exception_again;
 304               }
 305             for (size_t __i = 0; __i < _M_facets_size; ++__i)
 306               __newc[__i] = _M_caches[__i];
 307             for (size_t __i2 = _M_facets_size; __i2 < __new_size; ++__i2)
 308               __newc[__i2] = 0;
 309
 310             _M_facets_size = __new_size;
 311             _M_facets = __newf;
 312             _M_caches = __newc;
 313             delete [] __oldf;
 314             delete [] __oldc;
 315           }
 316
 317         __fp->_M_add_reference();
 318         const facet*& __fpr = _M_facets[__index];
 319         if (__fpr)
 320           {
 321             // Replacing an existing facet. Order matters.
 322             __fpr->_M_remove_reference();
 323             __fpr = __fp;
 324           }
 325         else
 326           {
 327             // Installing a newly created facet into an empty
 328             // _M_facets container, say a newly-constructed,
 329             // swanky-fresh _Impl.
 330             _M_facets[__index] = __fp;
 331           }
 332
 333         // Ideally, it would be nice to only remove the caches that
 334         // are now incorrect. However, some of the caches depend on
 335         // multiple facets, and we only know about one facet
 336         // here. It's no great loss: the first use of the new facet
 337         // will create a new, correctly cached facet anyway.
 338         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 339           {
 340             const facet* __cpr = _M_caches[__i];
 341             if (__cpr)
 342               {
 343                 __cpr->_M_remove_reference();
 344                 _M_caches[__i] = 0;
 345               }
 346           }
 347       }
 348   }
 349
 350
 351   // locale::id
 352   // Definitions for static const data members of locale::id
 353   _Atomic_word locale::id::_S_refcount;  // init'd to 0 by linker
 354
 355   size_t
 356   locale::id::_M_id() const
 357   {
 358     if (!_M_index)
 359       _M_index = 1 + __exchange_and_add(&_S_refcount, 1);
 360     return _M_index - 1;
 361   }
 362 } // namespace std
 363
 364