libstdc++-v3/src/locale.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
  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)
  60   { _M_impl->_M_add_reference(); }
  61
  62   // This is used to initialize global and classic locales, and
  63   // assumes that the _Impl objects are constructed correctly.
  64   // The lack of a reference increment is intentional.
  65   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
  66   { }
  67
  68   locale::~locale() throw()
  69   { _M_impl->_M_remove_reference(); }
  70
  71   bool
  72   locale::operator==(const locale& __rhs) const throw()
  73   {
  74     // Deal first with the common cases, fast to process: refcopies,
  75     // unnamed (i.e., !_M_names[0]), "simple" (!_M_names[1] => all the
  76     // categories same name, i.e., _M_names[0]). Otherwise fall back
  77     // to the general locale::name().
  78     bool __ret;
  79     if (_M_impl == __rhs._M_impl)
  80       __ret = true;
  81     else if (!_M_impl->_M_names[0] || !__rhs._M_impl->_M_names[0]
  82              || std::strcmp(_M_impl->_M_names[0],
  83                             __rhs._M_impl->_M_names[0]) != 0)
  84       __ret = false;
  85     else if (!_M_impl->_M_names[1] && !__rhs._M_impl->_M_names[1])
  86       __ret = true;
  87     else
  88       __ret = this->name() == __rhs.name();
  89     return __ret;
  90   }
  91
  92   const locale&
  93   locale::operator=(const locale& __other) throw()
  94   {
  95     __other._M_impl->_M_add_reference();
  96     _M_impl->_M_remove_reference();
  97     _M_impl = __other._M_impl;
  98     return *this;
  99   }
 100
 101   string
 102   locale::name() const
 103   {
 104     string __ret;
 105     if (!_M_impl->_M_names[0])
 106       __ret = '*';
 107     else if (_M_impl->_M_check_same_name())
 108       __ret = _M_impl->_M_names[0];
 109     else
 110       {
 111         __ret.reserve(128);
 112         __ret += _S_categories[0];
 113         __ret += '=';
 114         __ret += _M_impl->_M_names[0];
 115         for (size_t __i = 1; __i < _S_categories_size; ++__i)
 116           {
 117             __ret += ';';
 118             __ret += _S_categories[__i];
 119             __ret += '=';
 120             __ret += _M_impl->_M_names[__i];
 121           }
 122       }
 123     return __ret;
 124   }
 125
 126   locale::category
 127   locale::_S_normalize_category(category __cat)
 128   {
 129     int __ret = 0;
 130     if (__cat == none || (__cat & all) && !(__cat & ~all))
 131       __ret = __cat;
 132     else
 133       {
 134         // NB: May be a C-style "LC_ALL" category; convert.
 135         switch (__cat)
 136           {
 137           case LC_COLLATE:
 138             __ret = collate;
 139             break;
 140           case LC_CTYPE:
 141             __ret = ctype;
 142             break;
 143           case LC_MONETARY:
 144             __ret = monetary;
 145             break;
 146           case LC_NUMERIC:
 147             __ret = numeric;
 148             break;
 149           case LC_TIME:
 150             __ret = time;
 151             break;
 152 #ifdef _GLIBCXX_HAVE_LC_MESSAGES
 153           case LC_MESSAGES:
 154             __ret = messages;
 155             break;
 156 #endif
 157           case LC_ALL:
 158             __ret = all;
 159             break;
 160           default:
 161             __throw_runtime_error(__N("locale::_S_normalize_category "
 162                                   "category not found"));
 163           }
 164       }
 165     return __ret;
 166   }
 167
 168   // locale::facet
 169   __c_locale locale::facet::_S_c_locale;
 170
 171   const char locale::facet::_S_c_name[2] = "C";
 172
 173 #ifdef __GTHREADS
 174   __gthread_once_t locale::facet::_S_once = __GTHREAD_ONCE_INIT;
 175 #endif
 176
 177   void
 178   locale::facet::_S_initialize_once()
 179   {
 180     // Initialize the underlying locale model.
 181     _S_create_c_locale(_S_c_locale, _S_c_name);
 182   }
 183
 184   __c_locale
 185   locale::facet::_S_get_c_locale()
 186   {
 187 #ifdef __GHTREADS
 188     if (__gthread_active_p())
 189       __gthread_once(&_S_once, _S_initialize_once);
 190     else
 191 #endif
 192       {
 193         if (!_S_c_locale)
 194           _S_initialize_once();
 195       }
 196     return _S_c_locale;
 197   }
 198
 199   const char*
 200   locale::facet::_S_get_c_name()
 201   { return _S_c_name; }
 202
 203   locale::facet::
 204   ~facet() { }
 205
 206   // locale::_Impl
 207   locale::_Impl::
 208   ~_Impl() throw()
 209   {
 210     if (_M_facets)
 211       for (size_t __i = 0; __i < _M_facets_size; ++__i)
 212         if (_M_facets[__i])
 213           _M_facets[__i]->_M_remove_reference();
 214     delete [] _M_facets;
 215
 216     if (_M_caches)
 217       for (size_t __i = 0; __i < _M_facets_size; ++__i)
 218         if (_M_caches[__i])
 219           _M_caches[__i]->_M_remove_reference();
 220     delete [] _M_caches;
 221
 222     if (_M_names)
 223       for (size_t __i = 0; __i < _S_categories_size; ++__i)
 224         delete [] _M_names[__i];
 225     delete [] _M_names;
 226   }
 227
 228   // Clone existing _Impl object.
 229   locale::_Impl::
 230   _Impl(const _Impl& __imp, size_t __refs)
 231   : _M_refcount(__refs), _M_facets(0), _M_facets_size(__imp._M_facets_size),
 232   _M_caches(0), _M_names(0)
 233   {
 234     try
 235       {
 236         _M_facets = new const facet*[_M_facets_size];
 237         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 238           {
 239             _M_facets[__i] = __imp._M_facets[__i];
 240             if (_M_facets[__i])
 241               _M_facets[__i]->_M_add_reference();
 242           }
 243         _M_caches = new const facet*[_M_facets_size];
 244         for (size_t __j = 0; __j < _M_facets_size; ++__j)
 245           {
 246             _M_caches[__j] = __imp._M_caches[__j];
 247             if (_M_caches[__j])
 248               _M_caches[__j]->_M_add_reference();
 249           }
 250         _M_names = new char*[_S_categories_size];
 251         for (size_t __k = 0; __k < _S_categories_size; ++__k)
 252           _M_names[__k] = 0;
 253
 254         // Name the categories.
 255         for (size_t __l = 0; (__l < _S_categories_size
 256                               && __imp._M_names[__l]); ++__l)
 257           {
 258             const size_t __len = std::strlen(__imp._M_names[__l]) + 1;
 259             _M_names[__l] = new char[__len];
 260             std::memcpy(_M_names[__l], __imp._M_names[__l], __len);
 261           }
 262       }
 263     catch(...)
 264       {
 265         this->~_Impl();
 266         __throw_exception_again;
 267       }
 268   }
 269
 270   void
 271   locale::_Impl::
 272   _M_replace_category(const _Impl* __imp,
 273                       const locale::id* const* __idpp)
 274   {
 275     for (; *__idpp; ++__idpp)
 276       _M_replace_facet(__imp, *__idpp);
 277   }
 278
 279   void
 280   locale::_Impl::
 281   _M_replace_facet(const _Impl* __imp, const locale::id* __idp)
 282   {
 283     size_t __index = __idp->_M_id();
 284     if ((__index > (__imp->_M_facets_size - 1))
 285         || !__imp->_M_facets[__index])
 286       __throw_runtime_error(__N("locale::_Impl::_M_replace_facet"));
 287     _M_install_facet(__idp, __imp->_M_facets[__index]);
 288   }
 289
 290   void
 291   locale::_Impl::
 292   _M_install_facet(const locale::id* __idp, const facet* __fp)
 293   {
 294     if (__fp)
 295       {
 296         size_t __index = __idp->_M_id();
 297
 298         // Check size of facet vector to ensure adequate room.
 299         if (__index > _M_facets_size - 1)
 300           {
 301             const size_t __new_size = __index + 4;
 302
 303             // New facet array.
 304             const facet** __oldf = _M_facets;
 305             const facet** __newf;
 306             __newf = new const facet*[__new_size];
 307             for (size_t __i = 0; __i < _M_facets_size; ++__i)
 308               __newf[__i] = _M_facets[__i];
 309             for (size_t __l = _M_facets_size; __l < __new_size; ++__l)
 310               __newf[__l] = 0;
 311
 312             // New cache array.
 313             const facet** __oldc = _M_caches;
 314             const facet** __newc;
 315             try
 316               {
 317                 __newc = new const facet*[__new_size];
 318               }
 319             catch(...)
 320               {
 321                 delete [] __newf;
 322                 __throw_exception_again;
 323               }
 324             for (size_t __j = 0; __j < _M_facets_size; ++__j)
 325               __newc[__j] = _M_caches[__j];
 326             for (size_t __k = _M_facets_size; __k < __new_size; ++__k)
 327               __newc[__k] = 0;
 328
 329             _M_facets_size = __new_size;
 330             _M_facets = __newf;
 331             _M_caches = __newc;
 332             delete [] __oldf;
 333             delete [] __oldc;
 334           }
 335
 336         __fp->_M_add_reference();
 337         const facet*& __fpr = _M_facets[__index];
 338         if (__fpr)
 339           {
 340             // Replacing an existing facet. Order matters.
 341             __fpr->_M_remove_reference();
 342             __fpr = __fp;
 343           }
 344         else
 345           {
 346             // Installing a newly created facet into an empty
 347             // _M_facets container, say a newly-constructed,
 348             // swanky-fresh _Impl.
 349             _M_facets[__index] = __fp;
 350           }
 351
 352         // Ideally, it would be nice to only remove the caches that
 353         // are now incorrect. However, some of the caches depend on
 354         // multiple facets, and we only know about one facet
 355         // here. It's no great loss: the first use of the new facet
 356         // will create a new, correctly cached facet anyway.
 357         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 358           {
 359             const facet* __cpr = _M_caches[__i];
 360             if (__cpr)
 361               {
 362                 __cpr->_M_remove_reference();
 363                 _M_caches[__i] = 0;
 364               }
 365           }
 366       }
 367   }
 368
 369   // locale::id
 370   // Definitions for static const data members of locale::id
 371   _Atomic_word locale::id::_S_refcount;  // init'd to 0 by linker
 372
 373   size_t
 374   locale::id::_M_id() const
 375   {
 376     if (!_M_index)
 377       _M_index = 1 + __gnu_cxx::__exchange_and_add(&_S_refcount, 1);
 378     return _M_index - 1;
 379   }
 380 } // namespace std
 381
 382