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, free.
  32 #include <cctype>
  33 #include <cwctype>     // For towupper, etc.
  34 #include <locale>
  35 #include <bits/atomicity.h>
  36
  37 namespace __gnu_cxx
  38 {
  39   // Defined in globals.cc.
  40   extern std::locale            c_locale;
  41   extern std::locale::_Impl     c_locale_impl;
  42 } // namespace __gnu_cxx
  43
  44 namespace std
  45 {
  46   using namespace __gnu_cxx;
  47
  48   // Definitions for static const data members of locale.
  49   const locale::category        locale::none;
  50   const locale::category        locale::ctype;
  51   const locale::category        locale::numeric;
  52   const locale::category        locale::collate;
  53   const locale::category        locale::time;
  54   const locale::category        locale::monetary;
  55   const locale::category        locale::messages;
  56   const locale::category        locale::all;
  57
  58   // In the future, GLIBCXX_ABI > 5 should remove all uses of
  59   // _GLIBCXX_ASM_SYMVER in this file, and remove exports of any
  60   // static data members of locale.
  61
  62   // These are no longer exported.
  63   locale::_Impl*                locale::_S_classic;
  64   locale::_Impl*                locale::_S_global;
  65   const size_t                  locale::_S_categories_size;
  66
  67   // Definitions for static const data members of locale::id
  68   _Atomic_word locale::id::_S_highwater;  // init'd to 0 by linker
  69
  70   // Definitions for static const data members of locale::_Impl
  71   const locale::id* const
  72   locale::_Impl::_S_id_ctype[] =
  73   {
  74     &std::ctype<char>::id,
  75     &codecvt<char, char, mbstate_t>::id,
  76 #ifdef _GLIBCXX_USE_WCHAR_T
  77     &std::ctype<wchar_t>::id,
  78     &codecvt<wchar_t, char, mbstate_t>::id,
  79 #endif
  80     0
  81   };
  82
  83   const locale::id* const
  84   locale::_Impl::_S_id_numeric[] =
  85   {
  86     &num_get<char>::id,
  87     &num_put<char>::id,
  88     &numpunct<char>::id,
  89 #ifdef _GLIBCXX_USE_WCHAR_T
  90     &num_get<wchar_t>::id,
  91     &num_put<wchar_t>::id,
  92     &numpunct<wchar_t>::id,
  93 #endif
  94     0
  95   };
  96
  97   const locale::id* const
  98   locale::_Impl::_S_id_collate[] =
  99   {
 100     &std::collate<char>::id,
 101 #ifdef _GLIBCXX_USE_WCHAR_T
 102     &std::collate<wchar_t>::id,
 103 #endif
 104     0
 105   };
 106
 107   const locale::id* const
 108   locale::_Impl::_S_id_time[] =
 109   {
 110     &__timepunct<char>::id,
 111     &time_get<char>::id,
 112     &time_put<char>::id,
 113 #ifdef _GLIBCXX_USE_WCHAR_T
 114     &__timepunct<wchar_t>::id,
 115     &time_get<wchar_t>::id,
 116     &time_put<wchar_t>::id,
 117 #endif
 118     0
 119   };
 120
 121   const locale::id* const
 122   locale::_Impl::_S_id_monetary[] =
 123   {
 124     &money_get<char>::id,
 125     &money_put<char>::id,
 126     &moneypunct<char, false>::id,
 127     &moneypunct<char, true >::id,
 128 #ifdef _GLIBCXX_USE_WCHAR_T
 129     &money_get<wchar_t>::id,
 130     &money_put<wchar_t>::id,
 131     &moneypunct<wchar_t, false>::id,
 132     &moneypunct<wchar_t, true >::id,
 133 #endif
 134     0
 135   };
 136
 137   const locale::id* const
 138   locale::_Impl::_S_id_messages[] =
 139   {
 140     &std::messages<char>::id,
 141 #ifdef _GLIBCXX_USE_WCHAR_T
 142     &std::messages<wchar_t>::id,
 143 #endif
 144     0
 145   };
 146
 147   const locale::id* const* const
 148   locale::_Impl::_S_facet_categories[] =
 149   {
 150     // Order must match the decl order in class locale.
 151     locale::_Impl::_S_id_ctype,
 152     locale::_Impl::_S_id_numeric,
 153     locale::_Impl::_S_id_collate,
 154     locale::_Impl::_S_id_time,
 155     locale::_Impl::_S_id_monetary,
 156     locale::_Impl::_S_id_messages,
 157     0
 158   };
 159
 160   locale::locale() throw()
 161   {
 162     _S_initialize();
 163     (_M_impl = _S_global)->_M_add_reference();
 164   }
 165
 166   locale::locale(const locale& __other) throw()
 167   { (_M_impl = __other._M_impl)->_M_add_reference(); }
 168
 169   // This is used to initialize global and classic locales, and
 170   // assumes that the _Impl objects are constructed correctly.
 171   // The lack of a reference increment is intentional.
 172   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
 173   { }
 174
 175   locale::locale(const char* __s)
 176   {
 177     if (__s)
 178       {
 179         _S_initialize();
 180         if (std::strcmp(__s, "C") == 0 || std::strcmp(__s, "POSIX") == 0)
 181           (_M_impl = _S_classic)->_M_add_reference();
 182         else if (std::strcmp(__s, "") != 0)
 183           _M_impl = new _Impl(__s, 1);
 184         else
 185           {
 186             // Get it from the environment.
 187             char* __env = std::getenv("LC_ALL");
 188             // If LC_ALL is set we are done.
 189             if (__env && std::strcmp(__env, "") != 0)
 190               {
 191                 if (std::strcmp(__env, "C") == 0
 192                     || std::strcmp(__env, "POSIX") == 0)
 193                   (_M_impl = _S_classic)->_M_add_reference();
 194                 else
 195                   _M_impl = new _Impl(__env, 1);
 196               }
 197             else
 198               {
 199                 char* __res;
 200                 // LANG may set a default different from "C".
 201                 char* __env = std::getenv("LANG");
 202                 if (!__env || std::strcmp(__env, "") == 0
 203                     || std::strcmp(__env, "C") == 0
 204                     || std::strcmp(__env, "POSIX") == 0)
 205                   __res = strdup("C");
 206                 else
 207                   __res = strdup(__env);
 208
 209                 // Scan the categories looking for the first one
 210                 // different from LANG.
 211                 size_t __i = 0;
 212                 if (std::strcmp(__res, "C") == 0)
 213                   for (; __i < _S_categories_size; ++__i)
 214                     {
 215                       __env = std::getenv(_S_categories[__i]);
 216                       if (__env && std::strcmp(__env, "") != 0
 217                           && std::strcmp(__env, "C") != 0
 218                           && std::strcmp(__env, "POSIX") != 0)
 219                         break;
 220                     }
 221                 else
 222                   for (; __i < _S_categories_size; ++__i)
 223                     {
 224                       __env = std::getenv(_S_categories[__i]);
 225                       if (__env && std::strcmp(__env, "") != 0
 226                           && std::strcmp(__env, __res) != 0)
 227                         break;
 228                     }
 229
 230                 // If one is found, build the complete string of
 231                 // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...
 232                 if (__i < _S_categories_size)
 233                   {
 234                     string __str;
 235                     for (size_t __j = 0; __j < __i; ++__j)
 236                       {
 237                         __str += _S_categories[__j];
 238                         __str += '=';
 239                         __str += __res;
 240                         __str += ';';
 241                       }
 242                     __str += _S_categories[__i];
 243                     __str += '=';
 244                     __str += __env;
 245                     __str += ';';
 246                     __i++;
 247                     for (; __i < _S_categories_size; ++__i)
 248                       {
 249                         __env = std::getenv(_S_categories[__i]);
 250                         if (!__env || std::strcmp(__env, "") == 0)
 251                           {
 252                             __str += _S_categories[__i];
 253                             __str += '=';
 254                             __str += __res;
 255                             __str += ';';
 256                           }
 257                         else if (std::strcmp(__env, "C") == 0
 258                                  || std::strcmp(__env, "POSIX") == 0)
 259                           {
 260                             __str += _S_categories[__i];
 261                             __str += "=C;";
 262                           }
 263                         else
 264                           {
 265                             __str += _S_categories[__i];
 266                             __str += '=';
 267                             __str += __env;
 268                             __str += ';';
 269                           }
 270                       }
 271                     __str.erase(__str.end() - 1);
 272                     _M_impl = new _Impl(__str.c_str(), 1);
 273                   }
 274                 // ... otherwise either an additional instance of
 275                 // the "C" locale or LANG.
 276                 else if (std::strcmp(__res, "C") == 0)
 277                   (_M_impl = _S_classic)->_M_add_reference();
 278                 else
 279                   _M_impl = new _Impl(__res, 1);
 280                 std::free(__res);
 281               }
 282           }
 283       }
 284     else
 285       __throw_runtime_error("locale::locale NULL not valid");
 286   }
 287
 288   locale::locale(const locale& __base, const char* __s, category __cat)
 289   {
 290     // NB: There are complicated, yet more efficient ways to do
 291     // this. Building up locales on a per-category way is tedious, so
 292     // let's do it this way until people complain.
 293     locale __add(__s);
 294     _M_coalesce(__base, __add, __cat);
 295   }
 296
 297   locale::locale(const locale& __base, const locale& __add, category __cat)
 298   { _M_coalesce(__base, __add, __cat); }
 299
 300   locale::~locale() throw()
 301   { _M_impl->_M_remove_reference(); }
 302
 303   bool
 304   locale::operator==(const locale& __rhs) const throw()
 305   {
 306     string __name = this->name();
 307     return (_M_impl == __rhs._M_impl
 308             || (__name != "*" && __name == __rhs.name()));
 309   }
 310
 311   const locale&
 312   locale::operator=(const locale& __other) throw()
 313   {
 314     __other._M_impl->_M_add_reference();
 315     _M_impl->_M_remove_reference();
 316     _M_impl = __other._M_impl;
 317     return *this;
 318   }
 319
 320   locale
 321   locale::global(const locale& __other)
 322   {
 323     // XXX MT
 324     _S_initialize();
 325     _Impl* __old = _S_global;
 326     __other._M_impl->_M_add_reference();
 327     _S_global = __other._M_impl;
 328     if (_S_global->_M_check_same_name()
 329         && (std::strcmp(_S_global->_M_names[0], "*") != 0))
 330       setlocale(LC_ALL, __other.name().c_str());
 331
 332     // Reference count sanity check: one reference removed for the
 333     // subsition of __other locale, one added by return-by-value. Net
 334     // difference: zero. When the returned locale object's destrutor
 335     // is called, then the reference count is decremented and possibly
 336     // destroyed.
 337     return locale(__old);
 338   }
 339
 340   string
 341   locale::name() const
 342   {
 343     string __ret;
 344     if (_M_impl->_M_check_same_name())
 345       __ret = _M_impl->_M_names[0];
 346     else
 347       {
 348         __ret += _S_categories[0];
 349         __ret += '=';
 350         __ret += _M_impl->_M_names[0];
 351         for (size_t __i = 1; __i < _S_categories_size; ++__i)
 352           {
 353             __ret += ';';
 354             __ret += _S_categories[__i];
 355             __ret += '=';
 356             __ret += _M_impl->_M_names[__i];
 357           }
 358       }
 359     return __ret;
 360   }
 361
 362   const locale&
 363   locale::classic()
 364   {
 365     // Locking protocol: singleton-called-before-threading-starts
 366     if (!_S_classic)
 367       {
 368         try
 369           {
 370             // 26 Standard facets, 2 references.
 371             // One reference for _S_classic, one for _S_global
 372             _S_classic = new (&c_locale_impl) _Impl(0, 2, true);
 373             _S_global = _S_classic;
 374             new (&c_locale) locale(_S_classic);
 375           }
 376         catch(...)
 377           {
 378             // Just call destructor, so that locale_impl_c's memory is
 379             // not deallocated via a call to delete.
 380             if (_S_classic)
 381               _S_classic->~_Impl();
 382             _S_classic = _S_global = 0;
 383             __throw_exception_again;
 384           }
 385       }
 386     return c_locale;
 387   }
 388
 389   void
 390   locale::_M_coalesce(const locale& __base, const locale& __add,
 391                       category __cat)
 392   {
 393     __cat = _S_normalize_category(__cat);
 394     _M_impl = new _Impl(*__base._M_impl, 1);
 395
 396     try
 397       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
 398     catch (...)
 399       {
 400         _M_impl->_M_remove_reference();
 401         __throw_exception_again;
 402       }
 403   }
 404
 405   locale::category
 406   locale::_S_normalize_category(category __cat)
 407   {
 408     int __ret = 0;
 409     if (__cat == none || (__cat & all) && !(__cat & ~all))
 410       __ret = __cat;
 411     else
 412       {
 413         // NB: May be a C-style "LC_ALL" category; convert.
 414         switch (__cat)
 415           {
 416           case LC_COLLATE:
 417             __ret = collate;
 418             break;
 419           case LC_CTYPE:
 420             __ret = ctype;
 421             break;
 422           case LC_MONETARY:
 423             __ret = monetary;
 424             break;
 425           case LC_NUMERIC:
 426             __ret = numeric;
 427             break;
 428           case LC_TIME:
 429             __ret = time;
 430             break;
 431 #ifdef _GLIBCXX_HAVE_LC_MESSAGES
 432           case LC_MESSAGES:
 433             __ret = messages;
 434             break;
 435 #endif
 436           case LC_ALL:
 437             __ret = all;
 438             break;
 439           default:
 440             __throw_runtime_error("locale::_S_normalize_category "
 441                                   "category not found");
 442           }
 443       }
 444     return __ret;
 445   }
 446
 447   __c_locale
 448   locale::facet::_S_c_locale;
 449
 450   char locale::facet::_S_c_name[2];
 451
 452   locale::facet::
 453   ~facet() { }
 454
 455   // Definitions for static const data members of time_base.
 456   template<>
 457     const char*
 458     __timepunct_cache<char>::_S_timezones[14] =
 459     {
 460       "GMT", "HST", "AKST", "PST", "MST", "CST", "EST", "AST", "NST", "CET",
 461       "IST", "EET", "CST", "JST"
 462     };
 463
 464 #ifdef _GLIBCXX_USE_WCHAR_T
 465   template<>
 466     const wchar_t*
 467     __timepunct_cache<wchar_t>::_S_timezones[14] =
 468     {
 469       L"GMT", L"HST", L"AKST", L"PST", L"MST", L"CST", L"EST", L"AST",
 470       L"NST", L"CET", L"IST", L"EET", L"CST", L"JST"
 471     };
 472 #endif
 473
 474   // Definitions for static const data members of money_base.
 475   const money_base::pattern
 476   money_base::_S_default_pattern =  { {symbol, sign, none, value} };
 477
 478   const char* __num_base::_S_atoms_in = "-+xX0123456789eEabcdfABCDF";
 479   const char* __num_base::_S_atoms_out ="-+xX0123456789abcdef0123456789ABCDEF";
 480
 481   // _GLIBCXX_RESOLVE_LIB_DEFECTS
 482   // According to the resolution of DR 231, about 22.2.2.2.2, p11,
 483   // "str.precision() is specified in the conversion specification".
 484   void
 485   __num_base::_S_format_float(const ios_base& __io, char* __fptr, char __mod)
 486   {
 487     ios_base::fmtflags __flags = __io.flags();
 488     *__fptr++ = '%';
 489     // [22.2.2.2.2] Table 60
 490     if (__flags & ios_base::showpos)
 491       *__fptr++ = '+';
 492     if (__flags & ios_base::showpoint)
 493       *__fptr++ = '#';
 494
 495     // As per DR 231: _always_, not only when
 496     // __flags & ios_base::fixed || __prec > 0
 497     *__fptr++ = '.';
 498     *__fptr++ = '*';
 499
 500     if (__mod)
 501       *__fptr++ = __mod;
 502     ios_base::fmtflags __fltfield = __flags & ios_base::floatfield;
 503     // [22.2.2.2.2] Table 58
 504     if (__fltfield == ios_base::fixed)
 505       *__fptr++ = 'f';
 506     else if (__fltfield == ios_base::scientific)
 507       *__fptr++ = (__flags & ios_base::uppercase) ? 'E' : 'e';
 508     else
 509       *__fptr++ = (__flags & ios_base::uppercase) ? 'G' : 'g';
 510     *__fptr = '\0';
 511   }
 512 } // namespace std
 513