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 #ifdef __GTHREADS
  68   __gthread_once_t              locale::_S_once = __GTHREAD_ONCE_INIT;
  69 #endif
  70
  71   size_t
  72   locale::id::_M_id() const
  73   {
  74     if (!_M_index)
  75       _M_index = 1 + __exchange_and_add(&_S_highwater, 1);
  76     return _M_index - 1;
  77   }
  78
  79   // Definitions for static const data members of locale::id
  80   _Atomic_word locale::id::_S_highwater;  // init'd to 0 by linker
  81
  82   // Definitions for static const data members of locale::_Impl
  83   const locale::id* const
  84   locale::_Impl::_S_id_ctype[] =
  85   {
  86     &std::ctype<char>::id,
  87     &codecvt<char, char, mbstate_t>::id,
  88 #ifdef _GLIBCXX_USE_WCHAR_T
  89     &std::ctype<wchar_t>::id,
  90     &codecvt<wchar_t, char, mbstate_t>::id,
  91 #endif
  92     0
  93   };
  94
  95   const locale::id* const
  96   locale::_Impl::_S_id_numeric[] =
  97   {
  98     &num_get<char>::id,
  99     &num_put<char>::id,
 100     &numpunct<char>::id,
 101 #ifdef _GLIBCXX_USE_WCHAR_T
 102     &num_get<wchar_t>::id,
 103     &num_put<wchar_t>::id,
 104     &numpunct<wchar_t>::id,
 105 #endif
 106     0
 107   };
 108
 109   const locale::id* const
 110   locale::_Impl::_S_id_collate[] =
 111   {
 112     &std::collate<char>::id,
 113 #ifdef _GLIBCXX_USE_WCHAR_T
 114     &std::collate<wchar_t>::id,
 115 #endif
 116     0
 117   };
 118
 119   const locale::id* const
 120   locale::_Impl::_S_id_time[] =
 121   {
 122     &__timepunct<char>::id,
 123     &time_get<char>::id,
 124     &time_put<char>::id,
 125 #ifdef _GLIBCXX_USE_WCHAR_T
 126     &__timepunct<wchar_t>::id,
 127     &time_get<wchar_t>::id,
 128     &time_put<wchar_t>::id,
 129 #endif
 130     0
 131   };
 132
 133   const locale::id* const
 134   locale::_Impl::_S_id_monetary[] =
 135   {
 136     &money_get<char>::id,
 137     &money_put<char>::id,
 138     &moneypunct<char, false>::id,
 139     &moneypunct<char, true >::id,
 140 #ifdef _GLIBCXX_USE_WCHAR_T
 141     &money_get<wchar_t>::id,
 142     &money_put<wchar_t>::id,
 143     &moneypunct<wchar_t, false>::id,
 144     &moneypunct<wchar_t, true >::id,
 145 #endif
 146     0
 147   };
 148
 149   const locale::id* const
 150   locale::_Impl::_S_id_messages[] =
 151   {
 152     &std::messages<char>::id,
 153 #ifdef _GLIBCXX_USE_WCHAR_T
 154     &std::messages<wchar_t>::id,
 155 #endif
 156     0
 157   };
 158
 159   const locale::id* const* const
 160   locale::_Impl::_S_facet_categories[] =
 161   {
 162     // Order must match the decl order in class locale.
 163     locale::_Impl::_S_id_ctype,
 164     locale::_Impl::_S_id_numeric,
 165     locale::_Impl::_S_id_collate,
 166     locale::_Impl::_S_id_time,
 167     locale::_Impl::_S_id_monetary,
 168     locale::_Impl::_S_id_messages,
 169     0
 170   };
 171
 172   locale::locale() throw()
 173   {
 174     _S_initialize();
 175     (_M_impl = _S_global)->_M_add_reference();
 176   }
 177
 178   locale::locale(const locale& __other) throw()
 179   { (_M_impl = __other._M_impl)->_M_add_reference(); }
 180
 181   // This is used to initialize global and classic locales, and
 182   // assumes that the _Impl objects are constructed correctly.
 183   // The lack of a reference increment is intentional.
 184   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
 185   { }
 186
 187   locale::locale(const char* __s)
 188   {
 189     if (__s)
 190       {
 191         _S_initialize();
 192         if (std::strcmp(__s, "C") == 0 || std::strcmp(__s, "POSIX") == 0)
 193           (_M_impl = _S_classic)->_M_add_reference();
 194         else if (std::strcmp(__s, "") != 0)
 195           _M_impl = new _Impl(__s, 1);
 196         else
 197           {
 198             // Get it from the environment.
 199             char* __env = std::getenv("LC_ALL");
 200             // If LC_ALL is set we are done.
 201             if (__env && std::strcmp(__env, "") != 0)
 202               {
 203                 if (std::strcmp(__env, "C") == 0
 204                     || std::strcmp(__env, "POSIX") == 0)
 205                   (_M_impl = _S_classic)->_M_add_reference();
 206                 else
 207                   _M_impl = new _Impl(__env, 1);
 208               }
 209             else
 210               {
 211                 char* __res;
 212                 // LANG may set a default different from "C".
 213                 char* __env = std::getenv("LANG");
 214                 if (!__env || std::strcmp(__env, "") == 0
 215                     || std::strcmp(__env, "C") == 0
 216                     || std::strcmp(__env, "POSIX") == 0)
 217                   __res = strdup("C");
 218                 else
 219                   __res = strdup(__env);
 220
 221                 // Scan the categories looking for the first one
 222                 // different from LANG.
 223                 size_t __i = 0;
 224                 if (std::strcmp(__res, "C") == 0)
 225                   for (; __i < _S_categories_size; ++__i)
 226                     {
 227                       __env = std::getenv(_S_categories[__i]);
 228                       if (__env && std::strcmp(__env, "") != 0
 229                           && std::strcmp(__env, "C") != 0
 230                           && std::strcmp(__env, "POSIX") != 0)
 231                         break;
 232                     }
 233                 else
 234                   for (; __i < _S_categories_size; ++__i)
 235                     {
 236                       __env = std::getenv(_S_categories[__i]);
 237                       if (__env && std::strcmp(__env, "") != 0
 238                           && std::strcmp(__env, __res) != 0)
 239                         break;
 240                     }
 241
 242                 // If one is found, build the complete string of
 243                 // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...
 244                 if (__i < _S_categories_size)
 245                   {
 246                     string __str;
 247                     for (size_t __j = 0; __j < __i; ++__j)
 248                       {
 249                         __str += _S_categories[__j];
 250                         __str += '=';
 251                         __str += __res;
 252                         __str += ';';
 253                       }
 254                     __str += _S_categories[__i];
 255                     __str += '=';
 256                     __str += __env;
 257                     __str += ';';
 258                     __i++;
 259                     for (; __i < _S_categories_size; ++__i)
 260                       {
 261                         __env = std::getenv(_S_categories[__i]);
 262                         if (!__env || std::strcmp(__env, "") == 0)
 263                           {
 264                             __str += _S_categories[__i];
 265                             __str += '=';
 266                             __str += __res;
 267                             __str += ';';
 268                           }
 269                         else if (std::strcmp(__env, "C") == 0
 270                                  || std::strcmp(__env, "POSIX") == 0)
 271                           {
 272                             __str += _S_categories[__i];
 273                             __str += "=C;";
 274                           }
 275                         else
 276                           {
 277                             __str += _S_categories[__i];
 278                             __str += '=';
 279                             __str += __env;
 280                             __str += ';';
 281                           }
 282                       }
 283                     __str.erase(__str.end() - 1);
 284                     _M_impl = new _Impl(__str.c_str(), 1);
 285                   }
 286                 // ... otherwise either an additional instance of
 287                 // the "C" locale or LANG.
 288                 else if (std::strcmp(__res, "C") == 0)
 289                   (_M_impl = _S_classic)->_M_add_reference();
 290                 else
 291                   _M_impl = new _Impl(__res, 1);
 292                 std::free(__res);
 293               }
 294           }
 295       }
 296     else
 297       __throw_runtime_error("locale::locale NULL not valid");
 298   }
 299
 300   locale::locale(const locale& __base, const char* __s, category __cat)
 301   {
 302     // NB: There are complicated, yet more efficient ways to do
 303     // this. Building up locales on a per-category way is tedious, so
 304     // let's do it this way until people complain.
 305     locale __add(__s);
 306     _M_coalesce(__base, __add, __cat);
 307   }
 308
 309   locale::locale(const locale& __base, const locale& __add, category __cat)
 310   { _M_coalesce(__base, __add, __cat); }
 311
 312   locale::~locale() throw()
 313   { _M_impl->_M_remove_reference(); }
 314
 315   bool
 316   locale::operator==(const locale& __rhs) const throw()
 317   {
 318     string __name = this->name();
 319     return (_M_impl == __rhs._M_impl
 320             || (__name != "*" && __name == __rhs.name()));
 321   }
 322
 323   const locale&
 324   locale::operator=(const locale& __other) throw()
 325   {
 326     __other._M_impl->_M_add_reference();
 327     _M_impl->_M_remove_reference();
 328     _M_impl = __other._M_impl;
 329     return *this;
 330   }
 331
 332   locale
 333   locale::global(const locale& __other)
 334   {
 335     _S_initialize();
 336
 337     // XXX MT
 338     _Impl* __old = _S_global;
 339     __other._M_impl->_M_add_reference();
 340     _S_global = __other._M_impl;
 341     if (_S_global->_M_check_same_name()
 342         && (std::strcmp(_S_global->_M_names[0], "*") != 0))
 343       setlocale(LC_ALL, __other.name().c_str());
 344
 345     // Reference count sanity check: one reference removed for the
 346     // subsition of __other locale, one added by return-by-value. Net
 347     // difference: zero. When the returned locale object's destrutor
 348     // is called, then the reference count is decremented and possibly
 349     // destroyed.
 350     return locale(__old);
 351   }
 352
 353   string
 354   locale::name() const
 355   {
 356     string __ret;
 357     if (_M_impl->_M_check_same_name())
 358       __ret = _M_impl->_M_names[0];
 359     else
 360       {
 361         __ret += _S_categories[0];
 362         __ret += '=';
 363         __ret += _M_impl->_M_names[0];
 364         for (size_t __i = 1; __i < _S_categories_size; ++__i)
 365           {
 366             __ret += ';';
 367             __ret += _S_categories[__i];
 368             __ret += '=';
 369             __ret += _M_impl->_M_names[__i];
 370           }
 371       }
 372     return __ret;
 373   }
 374
 375   const locale&
 376   locale::classic()
 377   {
 378     _S_initialize();
 379     return c_locale;
 380   }
 381
 382   void
 383   locale::_S_initialize_once()
 384   {
 385     // 2 references.
 386     // One reference for _S_classic, one for _S_global
 387     _S_classic = new (&c_locale_impl) _Impl(2);
 388     _S_global = _S_classic;
 389     new (&c_locale) locale(_S_classic);
 390   }
 391
 392   void
 393   locale::_S_initialize()
 394   {
 395 #ifdef __GTHREADS
 396     if (__gthread_active_p())
 397       __gthread_once(&_S_once, _S_initialize_once);
 398     else
 399 #endif
 400       {
 401         if (!_S_classic)
 402           _S_initialize_once();
 403       }
 404   }
 405
 406   void
 407   locale::_M_coalesce(const locale& __base, const locale& __add,
 408                       category __cat)
 409   {
 410     __cat = _S_normalize_category(__cat);
 411     _M_impl = new _Impl(*__base._M_impl, 1);
 412
 413     try
 414       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
 415     catch (...)
 416       {
 417         _M_impl->_M_remove_reference();
 418         __throw_exception_again;
 419       }
 420   }
 421
 422   locale::category
 423   locale::_S_normalize_category(category __cat)
 424   {
 425     int __ret = 0;
 426     if (__cat == none || (__cat & all) && !(__cat & ~all))
 427       __ret = __cat;
 428     else
 429       {
 430         // NB: May be a C-style "LC_ALL" category; convert.
 431         switch (__cat)
 432           {
 433           case LC_COLLATE:
 434             __ret = collate;
 435             break;
 436           case LC_CTYPE:
 437             __ret = ctype;
 438             break;
 439           case LC_MONETARY:
 440             __ret = monetary;
 441             break;
 442           case LC_NUMERIC:
 443             __ret = numeric;
 444             break;
 445           case LC_TIME:
 446             __ret = time;
 447             break;
 448 #ifdef _GLIBCXX_HAVE_LC_MESSAGES
 449           case LC_MESSAGES:
 450             __ret = messages;
 451             break;
 452 #endif
 453           case LC_ALL:
 454             __ret = all;
 455             break;
 456           default:
 457             __throw_runtime_error("locale::_S_normalize_category "
 458                                   "category not found");
 459           }
 460       }
 461     return __ret;
 462   }
 463
 464   __c_locale locale::facet::_S_c_locale;
 465
 466   const char locale::facet::_S_c_name[2] = "C";
 467
 468 #ifdef __GTHREADS
 469   __gthread_once_t locale::facet::_S_once = __GTHREAD_ONCE_INIT;
 470 #endif
 471
 472   locale::facet::
 473   ~facet() { }
 474
 475   void
 476   locale::facet::_S_initialize_once()
 477   {
 478     // Initialize the underlying locale model.
 479     _S_create_c_locale(_S_c_locale, _S_c_name);
 480   }
 481
 482   __c_locale
 483   locale::facet::_S_get_c_locale()
 484   {
 485 #ifdef __GHTREADS
 486     if (__gthread_active_p())
 487       __gthread_once(&_S_once, _S_initialize_once);
 488     else
 489 #endif
 490       {
 491         if (!_S_c_locale)
 492           _S_initialize_once();
 493       }
 494     return _S_c_locale;
 495   }
 496
 497   const char*
 498   locale::facet::_S_get_c_name()
 499   { return _S_c_name; }
 500
 501   // Definitions for static const data members of time_base.
 502   template<>
 503     const char*
 504     __timepunct_cache<char>::_S_timezones[14] =
 505     {
 506       "GMT", "HST", "AKST", "PST", "MST", "CST", "EST", "AST", "NST", "CET",
 507       "IST", "EET", "CST", "JST"
 508     };
 509
 510 #ifdef _GLIBCXX_USE_WCHAR_T
 511   template<>
 512     const wchar_t*
 513     __timepunct_cache<wchar_t>::_S_timezones[14] =
 514     {
 515       L"GMT", L"HST", L"AKST", L"PST", L"MST", L"CST", L"EST", L"AST",
 516       L"NST", L"CET", L"IST", L"EET", L"CST", L"JST"
 517     };
 518 #endif
 519
 520   // Definitions for static const data members of money_base.
 521   const money_base::pattern
 522   money_base::_S_default_pattern =  { {symbol, sign, none, value} };
 523
 524   const char* __num_base::_S_atoms_in = "-+xX0123456789eEabcdfABCDF";
 525   const char* __num_base::_S_atoms_out ="-+xX0123456789abcdef0123456789ABCDEF";
 526
 527   // _GLIBCXX_RESOLVE_LIB_DEFECTS
 528   // According to the resolution of DR 231, about 22.2.2.2.2, p11,
 529   // "str.precision() is specified in the conversion specification".
 530   void
 531   __num_base::_S_format_float(const ios_base& __io, char* __fptr, char __mod)
 532   {
 533     ios_base::fmtflags __flags = __io.flags();
 534     *__fptr++ = '%';
 535     // [22.2.2.2.2] Table 60
 536     if (__flags & ios_base::showpos)
 537       *__fptr++ = '+';
 538     if (__flags & ios_base::showpoint)
 539       *__fptr++ = '#';
 540
 541     // As per DR 231: _always_, not only when
 542     // __flags & ios_base::fixed || __prec > 0
 543     *__fptr++ = '.';
 544     *__fptr++ = '*';
 545
 546     if (__mod)
 547       *__fptr++ = __mod;
 548     ios_base::fmtflags __fltfield = __flags & ios_base::floatfield;
 549     // [22.2.2.2.2] Table 58
 550     if (__fltfield == ios_base::fixed)
 551       *__fptr++ = 'f';
 552     else if (__fltfield == ios_base::scientific)
 553       *__fptr++ = (__flags & ios_base::uppercase) ? 'E' : 'e';
 554     else
 555       *__fptr++ = (__flags & ios_base::uppercase) ? 'G' : 'g';
 556     *__fptr = '\0';
 557   }
 558 } // namespace std
 559