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 <ext/concurrence.h>
  36
  37 namespace
  38 {
  39   __gnu_cxx::__mutex locale_cache_mutex;
  40 } // anonymous namespace
  41
  42 // XXX GLIBCXX_ABI Deprecated
  43 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
  44 # define _GLIBCXX_LOC_ID(mangled) extern std::locale::id mangled
  45 _GLIBCXX_LOC_ID (_ZNSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE);
  46 _GLIBCXX_LOC_ID (_ZNSt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE2idE);
  47 _GLIBCXX_LOC_ID (_ZNSt9money_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE);
  48 _GLIBCXX_LOC_ID (_ZNSt9money_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE2idE);
  49 # ifdef _GLIBCXX_USE_WCHAR_T
  50 _GLIBCXX_LOC_ID (_ZNSt7num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE2idE);
  51 _GLIBCXX_LOC_ID (_ZNSt7num_putIwSt19ostreambuf_iteratorIwSt11char_traitsIwEEE2idE);
  52 _GLIBCXX_LOC_ID (_ZNSt9money_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE2idE);
  53 _GLIBCXX_LOC_ID (_ZNSt9money_putIwSt19ostreambuf_iteratorIwSt11char_traitsIwEEE2idE);
  54 # endif
  55 #endif
  56
  57 _GLIBCXX_BEGIN_NAMESPACE(std)
  58
  59   // Definitions for static const data members of locale.
  60   const locale::category        locale::none;
  61   const locale::category        locale::ctype;
  62   const locale::category        locale::numeric;
  63   const locale::category        locale::collate;
  64   const locale::category        locale::time;
  65   const locale::category        locale::monetary;
  66   const locale::category        locale::messages;
  67   const locale::category        locale::all;
  68
  69   // These are no longer exported.
  70   locale::_Impl*                locale::_S_classic;
  71   locale::_Impl*                locale::_S_global;
  72
  73 #ifdef __GTHREADS
  74   __gthread_once_t              locale::_S_once = __GTHREAD_ONCE_INIT;
  75 #endif
  76
  77   locale::locale(const locale& __other) throw()
  78   : _M_impl(__other._M_impl)
  79   { _M_impl->_M_add_reference(); }
  80
  81   // This is used to initialize global and classic locales, and
  82   // assumes that the _Impl objects are constructed correctly.
  83   // The lack of a reference increment is intentional.
  84   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
  85   { }
  86
  87   locale::~locale() throw()
  88   { _M_impl->_M_remove_reference(); }
  89
  90   bool
  91   locale::operator==(const locale& __rhs) const throw()
  92   {
  93     // Deal first with the common cases, fast to process: refcopies,
  94     // unnamed (i.e., !_M_names[0]), "simple" (!_M_names[1] => all the
  95     // categories same name, i.e., _M_names[0]). Otherwise fall back
  96     // to the general locale::name().
  97     bool __ret;
  98     if (_M_impl == __rhs._M_impl)
  99       __ret = true;
 100     else if (!_M_impl->_M_names[0] || !__rhs._M_impl->_M_names[0]
 101              || std::strcmp(_M_impl->_M_names[0],
 102                             __rhs._M_impl->_M_names[0]) != 0)
 103       __ret = false;
 104     else if (!_M_impl->_M_names[1] && !__rhs._M_impl->_M_names[1])
 105       __ret = true;
 106     else
 107       __ret = this->name() == __rhs.name();
 108     return __ret;
 109   }
 110
 111   const locale&
 112   locale::operator=(const locale& __other) throw()
 113   {
 114     __other._M_impl->_M_add_reference();
 115     _M_impl->_M_remove_reference();
 116     _M_impl = __other._M_impl;
 117     return *this;
 118   }
 119
 120   string
 121   locale::name() const
 122   {
 123     string __ret;
 124     if (!_M_impl->_M_names[0])
 125       __ret = '*';
 126     else if (_M_impl->_M_check_same_name())
 127       __ret = _M_impl->_M_names[0];
 128     else
 129       {
 130         __ret.reserve(128);
 131         __ret += _S_categories[0];
 132         __ret += '=';
 133         __ret += _M_impl->_M_names[0];
 134         for (size_t __i = 1; __i < _S_categories_size; ++__i)
 135           {
 136             __ret += ';';
 137             __ret += _S_categories[__i];
 138             __ret += '=';
 139             __ret += _M_impl->_M_names[__i];
 140           }
 141       }
 142     return __ret;
 143   }
 144
 145   locale::category
 146   locale::_S_normalize_category(category __cat)
 147   {
 148     int __ret = 0;
 149     if (__cat == none || (__cat & all) && !(__cat & ~all))
 150       __ret = __cat;
 151     else
 152       {
 153         // NB: May be a C-style "LC_ALL" category; convert.
 154         switch (__cat)
 155           {
 156           case LC_COLLATE:
 157             __ret = collate;
 158             break;
 159           case LC_CTYPE:
 160             __ret = ctype;
 161             break;
 162           case LC_MONETARY:
 163             __ret = monetary;
 164             break;
 165           case LC_NUMERIC:
 166             __ret = numeric;
 167             break;
 168           case LC_TIME:
 169             __ret = time;
 170             break;
 171 #ifdef _GLIBCXX_HAVE_LC_MESSAGES
 172           case LC_MESSAGES:
 173             __ret = messages;
 174             break;
 175 #endif
 176           case LC_ALL:
 177             __ret = all;
 178             break;
 179           default:
 180             __throw_runtime_error(__N("locale::_S_normalize_category "
 181                                   "category not found"));
 182           }
 183       }
 184     return __ret;
 185   }
 186
 187   // locale::facet
 188   __c_locale locale::facet::_S_c_locale;
 189
 190   const char locale::facet::_S_c_name[2] = "C";
 191
 192 #ifdef __GTHREADS
 193   __gthread_once_t locale::facet::_S_once = __GTHREAD_ONCE_INIT;
 194 #endif
 195
 196   void
 197   locale::facet::_S_initialize_once()
 198   {
 199     // Initialize the underlying locale model.
 200     _S_create_c_locale(_S_c_locale, _S_c_name);
 201   }
 202
 203   __c_locale
 204   locale::facet::_S_get_c_locale()
 205   {
 206 #ifdef __GHTREADS
 207     if (__gthread_active_p())
 208       __gthread_once(&_S_once, _S_initialize_once);
 209     else
 210 #endif
 211       {
 212         if (!_S_c_locale)
 213           _S_initialize_once();
 214       }
 215     return _S_c_locale;
 216   }
 217
 218   const char*
 219   locale::facet::_S_get_c_name()
 220   { return _S_c_name; }
 221
 222   locale::facet::
 223   ~facet() { }
 224
 225   // locale::_Impl
 226   locale::_Impl::
 227   ~_Impl() throw()
 228   {
 229     if (_M_facets)
 230       for (size_t __i = 0; __i < _M_facets_size; ++__i)
 231         if (_M_facets[__i])
 232           _M_facets[__i]->_M_remove_reference();
 233     delete [] _M_facets;
 234
 235     if (_M_caches)
 236       for (size_t __i = 0; __i < _M_facets_size; ++__i)
 237         if (_M_caches[__i])
 238           _M_caches[__i]->_M_remove_reference();
 239     delete [] _M_caches;
 240
 241     if (_M_names)
 242       for (size_t __i = 0; __i < _S_categories_size; ++__i)
 243         delete [] _M_names[__i];
 244     delete [] _M_names;
 245   }
 246
 247   // Clone existing _Impl object.
 248   locale::_Impl::
 249   _Impl(const _Impl& __imp, size_t __refs)
 250   : _M_refcount(__refs), _M_facets(0), _M_facets_size(__imp._M_facets_size),
 251   _M_caches(0), _M_names(0)
 252   {
 253     try
 254       {
 255         _M_facets = new const facet*[_M_facets_size];
 256         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 257           {
 258             _M_facets[__i] = __imp._M_facets[__i];
 259             if (_M_facets[__i])
 260               _M_facets[__i]->_M_add_reference();
 261           }
 262         _M_caches = new const facet*[_M_facets_size];
 263         for (size_t __j = 0; __j < _M_facets_size; ++__j)
 264           {
 265             _M_caches[__j] = __imp._M_caches[__j];
 266             if (_M_caches[__j])
 267               _M_caches[__j]->_M_add_reference();
 268           }
 269         _M_names = new char*[_S_categories_size];
 270         for (size_t __k = 0; __k < _S_categories_size; ++__k)
 271           _M_names[__k] = 0;
 272
 273         // Name the categories.
 274         for (size_t __l = 0; (__l < _S_categories_size
 275                               && __imp._M_names[__l]); ++__l)
 276           {
 277             const size_t __len = std::strlen(__imp._M_names[__l]) + 1;
 278             _M_names[__l] = new char[__len];
 279             std::memcpy(_M_names[__l], __imp._M_names[__l], __len);
 280           }
 281       }
 282     catch(...)
 283       {
 284         this->~_Impl();
 285         __throw_exception_again;
 286       }
 287   }
 288
 289   void
 290   locale::_Impl::
 291   _M_replace_category(const _Impl* __imp,
 292                       const locale::id* const* __idpp)
 293   {
 294     for (; *__idpp; ++__idpp)
 295       _M_replace_facet(__imp, *__idpp);
 296   }
 297
 298   void
 299   locale::_Impl::
 300   _M_replace_facet(const _Impl* __imp, const locale::id* __idp)
 301   {
 302     size_t __index = __idp->_M_id();
 303     if ((__index > (__imp->_M_facets_size - 1))
 304         || !__imp->_M_facets[__index])
 305       __throw_runtime_error(__N("locale::_Impl::_M_replace_facet"));
 306     _M_install_facet(__idp, __imp->_M_facets[__index]);
 307   }
 308
 309   void
 310   locale::_Impl::
 311   _M_install_facet(const locale::id* __idp, const facet* __fp)
 312   {
 313     if (__fp)
 314       {
 315         size_t __index = __idp->_M_id();
 316
 317         // Check size of facet vector to ensure adequate room.
 318         if (__index > _M_facets_size - 1)
 319           {
 320             const size_t __new_size = __index + 4;
 321
 322             // New facet array.
 323             const facet** __oldf = _M_facets;
 324             const facet** __newf;
 325             __newf = new const facet*[__new_size];
 326             for (size_t __i = 0; __i < _M_facets_size; ++__i)
 327               __newf[__i] = _M_facets[__i];
 328             for (size_t __l = _M_facets_size; __l < __new_size; ++__l)
 329               __newf[__l] = 0;
 330
 331             // New cache array.
 332             const facet** __oldc = _M_caches;
 333             const facet** __newc;
 334             try
 335               {
 336                 __newc = new const facet*[__new_size];
 337               }
 338             catch(...)
 339               {
 340                 delete [] __newf;
 341                 __throw_exception_again;
 342               }
 343             for (size_t __j = 0; __j < _M_facets_size; ++__j)
 344               __newc[__j] = _M_caches[__j];
 345             for (size_t __k = _M_facets_size; __k < __new_size; ++__k)
 346               __newc[__k] = 0;
 347
 348             _M_facets_size = __new_size;
 349             _M_facets = __newf;
 350             _M_caches = __newc;
 351             delete [] __oldf;
 352             delete [] __oldc;
 353           }
 354
 355         __fp->_M_add_reference();
 356         const facet*& __fpr = _M_facets[__index];
 357         if (__fpr)
 358           {
 359             // Replacing an existing facet. Order matters.
 360             __fpr->_M_remove_reference();
 361             __fpr = __fp;
 362           }
 363         else
 364           {
 365             // Installing a newly created facet into an empty
 366             // _M_facets container, say a newly-constructed,
 367             // swanky-fresh _Impl.
 368             _M_facets[__index] = __fp;
 369           }
 370
 371         // Ideally, it would be nice to only remove the caches that
 372         // are now incorrect. However, some of the caches depend on
 373         // multiple facets, and we only know about one facet
 374         // here. It's no great loss: the first use of the new facet
 375         // will create a new, correctly cached facet anyway.
 376         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 377           {
 378             const facet* __cpr = _M_caches[__i];
 379             if (__cpr)
 380               {
 381                 __cpr->_M_remove_reference();
 382                 _M_caches[__i] = 0;
 383               }
 384           }
 385       }
 386   }
 387
 388   void
 389   locale::_Impl::
 390   _M_install_cache(const facet* __cache, size_t __index)
 391   {
 392     __gnu_cxx::__scoped_lock sentry(locale_cache_mutex);
 393     if (_M_caches[__index] != 0)
 394       {
 395         // Some other thread got in first.
 396         delete __cache;
 397       }
 398     else
 399       {
 400         __cache->_M_add_reference();
 401         _M_caches[__index] = __cache;
 402       }
 403   }
 404
 405   // locale::id
 406   // Definitions for static const data members of locale::id
 407   _Atomic_word locale::id::_S_refcount;  // init'd to 0 by linker
 408
 409   size_t
 410   locale::id::_M_id() const
 411   {
 412     if (!_M_index)
 413       {
 414         // XXX GLIBCXX_ABI Deprecated
 415 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
 416         locale::id *f = 0;
 417 # define _GLIBCXX_SYNC_ID(facet, mangled) \
 418         if (this == &::mangled)                         \
 419           f = &facet::id
 420         _GLIBCXX_SYNC_ID (num_get<char>, _ZNSt7num_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE);
 421         _GLIBCXX_SYNC_ID (num_put<char>, _ZNSt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE2idE);
 422         _GLIBCXX_SYNC_ID (money_get<char>, _ZNSt9money_getIcSt19istreambuf_iteratorIcSt11char_traitsIcEEE2idE);
 423         _GLIBCXX_SYNC_ID (money_put<char>, _ZNSt9money_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE2idE);
 424 # ifdef _GLIBCXX_USE_WCHAR_T
 425         _GLIBCXX_SYNC_ID (num_get<wchar_t>, _ZNSt7num_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE2idE);
 426         _GLIBCXX_SYNC_ID (num_put<wchar_t>, _ZNSt7num_putIwSt19ostreambuf_iteratorIwSt11char_traitsIwEEE2idE);
 427         _GLIBCXX_SYNC_ID (money_get<wchar_t>, _ZNSt9money_getIwSt19istreambuf_iteratorIwSt11char_traitsIwEEE2idE);
 428         _GLIBCXX_SYNC_ID (money_put<wchar_t>, _ZNSt9money_putIwSt19ostreambuf_iteratorIwSt11char_traitsIwEEE2idE);
 429 # endif
 430         if (f)
 431           _M_index = 1 + f->_M_id();
 432         else
 433 #endif
 434           _M_index = 1 + __gnu_cxx::__exchange_and_add_dispatch(&_S_refcount,
 435                                                                 1);
 436       }
 437     return _M_index - 1;
 438   }
 439
 440 _GLIBCXX_END_NAMESPACE