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 <cassert>
  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   // _GLIBCPP_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   const size_t                  locale::_S_extra_categories_size;
  67
  68   // Definitions for static const data members of locale::id
  69   _Atomic_word locale::id::_S_highwater;  // init'd to 0 by linker
  70
  71   // Definitions for static const data members of locale::_Impl
  72   const locale::id* const
  73   locale::_Impl::_S_id_ctype[] =
  74   {
  75     &std::ctype<char>::id,
  76     &codecvt<char, char, mbstate_t>::id,
  77 #ifdef _GLIBCPP_USE_WCHAR_T
  78     &std::ctype<wchar_t>::id,
  79     &codecvt<wchar_t, char, mbstate_t>::id,
  80 #endif
  81     0
  82   };
  83
  84   const locale::id* const
  85   locale::_Impl::_S_id_numeric[] =
  86   {
  87     &num_get<char>::id,
  88     &num_put<char>::id,
  89     &numpunct<char>::id,
  90 #ifdef _GLIBCPP_USE_WCHAR_T
  91     &num_get<wchar_t>::id,
  92     &num_put<wchar_t>::id,
  93     &numpunct<wchar_t>::id,
  94 #endif
  95     0
  96   };
  97
  98   const locale::id* const
  99   locale::_Impl::_S_id_collate[] =
 100   {
 101     &std::collate<char>::id,
 102 #ifdef _GLIBCPP_USE_WCHAR_T
 103     &std::collate<wchar_t>::id,
 104 #endif
 105     0
 106   };
 107
 108   const locale::id* const
 109   locale::_Impl::_S_id_time[] =
 110   {
 111     &__timepunct<char>::id,
 112     &time_get<char>::id,
 113     &time_put<char>::id,
 114 #ifdef _GLIBCPP_USE_WCHAR_T
 115     &__timepunct<wchar_t>::id,
 116     &time_get<wchar_t>::id,
 117     &time_put<wchar_t>::id,
 118 #endif
 119     0
 120   };
 121
 122   const locale::id* const
 123   locale::_Impl::_S_id_monetary[] =
 124   {
 125     &money_get<char>::id,
 126     &money_put<char>::id,
 127     &moneypunct<char, false>::id,
 128     &moneypunct<char, true >::id,
 129 #ifdef _GLIBCPP_USE_WCHAR_T
 130     &money_get<wchar_t>::id,
 131     &money_put<wchar_t>::id,
 132     &moneypunct<wchar_t, false>::id,
 133     &moneypunct<wchar_t, true >::id,
 134 #endif
 135     0
 136   };
 137
 138   const locale::id* const
 139   locale::_Impl::_S_id_messages[] =
 140   {
 141     &std::messages<char>::id,
 142 #ifdef _GLIBCPP_USE_WCHAR_T
 143     &std::messages<wchar_t>::id,
 144 #endif
 145     0
 146   };
 147
 148   const locale::id* const* const
 149   locale::_Impl::_S_facet_categories[] =
 150   {
 151     // Order must match the decl order in class locale.
 152     locale::_Impl::_S_id_ctype,
 153     locale::_Impl::_S_id_numeric,
 154     locale::_Impl::_S_id_collate,
 155     locale::_Impl::_S_id_time,
 156     locale::_Impl::_S_id_monetary,
 157     locale::_Impl::_S_id_messages,
 158     0
 159   };
 160
 161   locale::locale() throw()
 162   {
 163     _S_initialize();
 164     (_M_impl = _S_global)->_M_add_reference();
 165   }
 166
 167   locale::locale(const locale& __other) throw()
 168   { (_M_impl = __other._M_impl)->_M_add_reference(); }
 169
 170   // This is used to initialize global and classic locales, and
 171   // assumes that the _Impl objects are constructed correctly.
 172   // The lack of a reference increment is intentional.
 173   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
 174   { }
 175
 176   locale::locale(const char* __s)
 177   {
 178     if (__s)
 179       {
 180         _S_initialize();
 181         if (strcmp(__s, "C") == 0 || strcmp(__s, "POSIX") == 0)
 182           (_M_impl = _S_classic)->_M_add_reference();
 183         else if (strcmp(__s, "") != 0)
 184           _M_impl = new _Impl(__s, 1);
 185         else
 186           {
 187             // Get it from the environment.
 188             char* __env = getenv("LC_ALL");
 189             // If LC_ALL is set we are done.
 190             if (__env && strcmp(__env, "") != 0)
 191               {
 192                 if (strcmp(__env, "C") == 0 || 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 = getenv("LANG");
 202                 if (!__env || strcmp(__env, "") == 0 || strcmp(__env, "C") == 0
 203                     || strcmp(__env, "POSIX") == 0)
 204                   __res = strdup("C");
 205                 else
 206                   __res = strdup(__env);
 207
 208                 // Scan the categories looking for the first one
 209                 // different from LANG.
 210                 size_t __i = 0;
 211                 if (strcmp(__res, "C") == 0)
 212                   for (; __i < _S_categories_size
 213                          + _S_extra_categories_size; ++__i)
 214                     {
 215                       __env = getenv(_S_categories[__i]);
 216                       if (__env && strcmp(__env, "") != 0
 217                           && strcmp(__env, "C") != 0
 218                           && strcmp(__env, "POSIX") != 0)
 219                         break;
 220                     }
 221                 else
 222                   for (; __i < _S_categories_size
 223                          + _S_extra_categories_size; ++__i)
 224                     {
 225                       __env = getenv(_S_categories[__i]);
 226                       if (__env && strcmp(__env, "") != 0
 227                           && strcmp(__env, __res) != 0)
 228                         break;
 229                     }
 230
 231                 // If one is found, build the complete string of
 232                 // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...
 233                 if (__i < _S_categories_size + _S_extra_categories_size)
 234                   {
 235                     string __str;
 236                     for (size_t __j = 0; __j < __i; ++__j)
 237                       {
 238                         __str += _S_categories[__j];
 239                         __str += '=';
 240                         __str += __res;
 241                         __str += ';';
 242                       }
 243                     __str += _S_categories[__i];
 244                     __str += '=';
 245                     __str += __env;
 246                     __str += ';';
 247                     __i++;
 248                     for (; __i < _S_categories_size
 249                            + _S_extra_categories_size; ++__i)
 250                       {
 251                         __env = getenv(_S_categories[__i]);
 252                         if (!__env || strcmp(__env, "") == 0)
 253                           {
 254                             __str += _S_categories[__i];
 255                             __str += '=';
 256                             __str += __res;
 257                             __str += ';';
 258                           }
 259                         else if (strcmp(__env, "C") == 0
 260                                  || strcmp(__env, "POSIX") == 0)
 261                           {
 262                             __str += _S_categories[__i];
 263                             __str += "=C;";
 264                           }
 265                         else
 266                           {
 267                             __str += _S_categories[__i];
 268                             __str += '=';
 269                             __str += __env;
 270                             __str += ';';
 271                           }
 272                       }
 273                     __str.erase(__str.end() - 1);
 274                     _M_impl = new _Impl(__str.c_str(), 1);
 275                   }
 276                 // ... otherwise either an additional instance of
 277                 // the "C" locale or LANG.
 278                 else if (strcmp(__res, "C") == 0)
 279                   (_M_impl = _S_classic)->_M_add_reference();
 280                 else
 281                   _M_impl = new _Impl(__res, 1);
 282                 free(__res);
 283               }
 284           }
 285       }
 286     else
 287       __throw_runtime_error("attempt to create locale from NULL name");
 288   }
 289
 290   locale::locale(const locale& __base, const char* __s, category __cat)
 291   {
 292     // NB: There are complicated, yet more efficient ways to do
 293     // this. Building up locales on a per-category way is tedious, so
 294     // let's do it this way until people complain.
 295     locale __add(__s);
 296     _M_coalesce(__base, __add, __cat);
 297   }
 298
 299   locale::locale(const locale& __base, const locale& __add, category __cat)
 300   { _M_coalesce(__base, __add, __cat); }
 301
 302   locale::~locale() throw()
 303   { _M_impl->_M_remove_reference(); }
 304
 305   bool
 306   locale::operator==(const locale& __rhs) const throw()
 307   {
 308     string __name = this->name();
 309     return (_M_impl == __rhs._M_impl
 310             || (__name != "*" && __name == __rhs.name()));
 311   }
 312
 313   const locale&
 314   locale::operator=(const locale& __other) throw()
 315   {
 316     __other._M_impl->_M_add_reference();
 317     _M_impl->_M_remove_reference();
 318     _M_impl = __other._M_impl;
 319     return *this;
 320   }
 321
 322   locale
 323   locale::global(const locale& __other)
 324   {
 325     // XXX MT
 326     _S_initialize();
 327     _Impl* __old = _S_global;
 328     __other._M_impl->_M_add_reference();
 329     _S_global = __other._M_impl;
 330     if (_S_global->_M_check_same_name()
 331         && (strcmp(_S_global->_M_names[0], "*") != 0))
 332       setlocale(LC_ALL, __other.name().c_str());
 333
 334     // Reference count sanity check: one reference removed for the
 335     // subsition of __other locale, one added by return-by-value. Net
 336     // difference: zero. When the returned locale object's destrutor
 337     // is called, then the reference count is decremented and possibly
 338     // destroyed.
 339     return locale(__old);
 340   }
 341
 342   string
 343   locale::name() const
 344   {
 345     string __ret;
 346     if (_M_impl->_M_check_same_name())
 347       __ret = _M_impl->_M_names[0];
 348     else
 349       {
 350         __ret += _S_categories[0];
 351         __ret += '=';
 352         __ret += _M_impl->_M_names[0];
 353         for (size_t __i = 1;
 354              __i < _S_categories_size + _S_extra_categories_size;
 355              ++__i)
 356           {
 357             __ret += ';';
 358             __ret += _S_categories[__i];
 359             __ret += '=';
 360             __ret += _M_impl->_M_names[__i];
 361           }
 362       }
 363     return __ret;
 364   }
 365
 366   const locale&
 367   locale::classic()
 368   {
 369     // Locking protocol: singleton-called-before-threading-starts
 370     if (!_S_classic)
 371       {
 372         try
 373           {
 374             // 26 Standard facets, 2 references.
 375             // One reference for _S_classic, one for _S_global
 376             _S_classic = new (&c_locale_impl) _Impl(0, 2, true);
 377             _S_global = _S_classic;
 378             new (&c_locale) locale(_S_classic);
 379           }
 380         catch(...)
 381           {
 382             // Just call destructor, so that locale_impl_c's memory is
 383             // not deallocated via a call to delete.
 384             if (_S_classic)
 385               _S_classic->~_Impl();
 386             _S_classic = _S_global = 0;
 387             __throw_exception_again;
 388           }
 389       }
 390     return c_locale;
 391   }
 392
 393   void
 394   locale::_M_coalesce(const locale& __base, const locale& __add,
 395                       category __cat)
 396   {
 397     __cat = _S_normalize_category(__cat);
 398     _M_impl = new _Impl(*__base._M_impl, 1);
 399
 400     try
 401       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
 402     catch (...)
 403       {
 404         _M_impl->_M_remove_reference();
 405         __throw_exception_again;
 406       }
 407   }
 408
 409   locale::category
 410   locale::_S_normalize_category(category __cat)
 411   {
 412     int __ret = 0;
 413     if (__cat == none || (__cat & all) && !(__cat & ~all))
 414       __ret = __cat;
 415     else
 416       {
 417         // NB: May be a C-style "LC_ALL" category; convert.
 418         switch (__cat)
 419           {
 420           case LC_COLLATE:
 421             __ret = collate;
 422             break;
 423           case LC_CTYPE:
 424             __ret = ctype;
 425             break;
 426           case LC_MONETARY:
 427             __ret = monetary;
 428             break;
 429           case LC_NUMERIC:
 430             __ret = numeric;
 431             break;
 432           case LC_TIME:
 433             __ret = time;
 434             break;
 435 #ifdef _GLIBCPP_HAVE_LC_MESSAGES
 436           case LC_MESSAGES:
 437             __ret = messages;
 438             break;
 439 #endif
 440           case LC_ALL:
 441             __ret = all;
 442             break;
 443           default:
 444             __throw_runtime_error("bad locale category");
 445           }
 446       }
 447     return __ret;
 448   }
 449
 450   __c_locale
 451   locale::facet::_S_c_locale;
 452
 453   char locale::facet::_S_c_name[2];
 454
 455   locale::facet::
 456   ~facet() { }
 457
 458   locale::facet::
 459   facet(size_t __refs) throw() : _M_references(__refs ? 1 : 0)
 460   { }
 461
 462   void
 463   locale::facet::
 464   _M_add_reference() throw()
 465   { __atomic_add(&_M_references, 1); }
 466
 467   void
 468   locale::facet::
 469   _M_remove_reference() throw()
 470   {
 471     if (__exchange_and_add(&_M_references, -1) == 1)
 472       {
 473         try
 474           { delete this; }
 475         catch (...)
 476           { }
 477       }
 478   }
 479
 480   locale::id::id()
 481   { }
 482
 483   // Definitions for static const data members of time_base
 484   template<>
 485     const char*
 486     __timepunct<char>::_S_timezones[14] =
 487     {
 488       "GMT", "HST", "AKST", "PST", "MST", "CST", "EST", "AST", "NST", "CET",
 489       "IST", "EET", "CST", "JST"
 490     };
 491
 492 #ifdef _GLIBCPP_USE_WCHAR_T
 493   template<>
 494     const wchar_t*
 495     __timepunct<wchar_t>::_S_timezones[14] =
 496     {
 497       L"GMT", L"HST", L"AKST", L"PST", L"MST", L"CST", L"EST", L"AST",
 498       L"NST", L"CET", L"IST", L"EET", L"CST", L"JST"
 499     };
 500 #endif
 501
 502   // Definitions for static const data members of money_base
 503   const money_base::pattern
 504   money_base::_S_default_pattern =  { {symbol, sign, none, value} };
 505
 506   const char __num_base::_S_atoms[] = "0123456789eEabcdfABCDF";
 507
 508   bool
 509   __num_base::_S_format_float(const ios_base& __io, char* __fptr, char __mod,
 510                               streamsize __prec)
 511   {
 512     bool __incl_prec = false;
 513     ios_base::fmtflags __flags = __io.flags();
 514     *__fptr++ = '%';
 515     // [22.2.2.2.2] Table 60
 516     if (__flags & ios_base::showpos)
 517       *__fptr++ = '+';
 518     if (__flags & ios_base::showpoint)
 519       *__fptr++ = '#';
 520     // As per [22.2.2.2.2.11]
 521     if (__flags & ios_base::fixed || __prec > 0)
 522       {
 523         *__fptr++ = '.';
 524         *__fptr++ = '*';
 525         __incl_prec = true;
 526       }
 527     if (__mod)
 528       *__fptr++ = __mod;
 529     ios_base::fmtflags __fltfield = __flags & ios_base::floatfield;
 530     // [22.2.2.2.2] Table 58
 531     if (__fltfield == ios_base::fixed)
 532       *__fptr++ = 'f';
 533     else if (__fltfield == ios_base::scientific)
 534       *__fptr++ = (__flags & ios_base::uppercase) ? 'E' : 'e';
 535     else
 536       *__fptr++ = (__flags & ios_base::uppercase) ? 'G' : 'g';
 537     *__fptr = '\0';
 538     return __incl_prec;
 539   }
 540
 541   void
 542   __num_base::_S_format_int(const ios_base& __io, char* __fptr, char __mod,
 543                             char __modl)
 544   {
 545     ios_base::fmtflags __flags = __io.flags();
 546     *__fptr++ = '%';
 547     // [22.2.2.2.2] Table 60
 548     if (__flags & ios_base::showpos)
 549       *__fptr++ = '+';
 550     if (__flags & ios_base::showbase)
 551       *__fptr++ = '#';
 552     *__fptr++ = 'l';
 553
 554     // For long long types.
 555     if (__modl)
 556       *__fptr++ = __modl;
 557
 558     ios_base::fmtflags __bsefield = __flags & ios_base::basefield;
 559     if (__bsefield == ios_base::hex)
 560       *__fptr++ = (__flags & ios_base::uppercase) ? 'X' : 'x';
 561     else if (__bsefield == ios_base::oct)
 562       *__fptr++ = 'o';
 563     else
 564       *__fptr++ = __mod;
 565     *__fptr = '\0';
 566   }
 567 } // namespace std
 568