libstdc++-v3/src/locale.cc

   1 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
   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 <limits>
  35 #include <exception>
  36 #include <locale>
  37 #include <istream>
  38 #include <ostream>
  39 #include <bits/atomicity.h>
  40
  41 namespace std
  42 {
  43   // Defined in globals.cc.
  44   extern locale                 c_locale;
  45   extern locale::_Impl          c_locale_impl;
  46   extern locale::facet**        facet_vec;
  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   locale::_Impl*                locale::_S_classic;
  59   locale::_Impl*                locale::_S_global;
  60   const size_t                  locale::_S_num_categories;
  61
  62   // Definitions for static const data members of locale::id
  63   _Atomic_word locale::id::_S_highwater;  // init'd to 0 by linker
  64
  65   // Definitions for static const data members of locale::_Impl
  66   const locale::id* const
  67   locale::_Impl::_S_id_ctype[] =
  68   {
  69     &std::ctype<char>::id,
  70     &codecvt<char, char, mbstate_t>::id,
  71 #ifdef _GLIBCPP_USE_WCHAR_T
  72     &std::ctype<wchar_t>::id,
  73     &codecvt<wchar_t, char, mbstate_t>::id,
  74 #endif
  75     0
  76   };
  77
  78   const locale::id* const
  79   locale::_Impl::_S_id_numeric[] =
  80   {
  81     &num_get<char>::id,
  82     &num_put<char>::id,
  83     &numpunct<char>::id,
  84 #ifdef _GLIBCPP_USE_WCHAR_T
  85     &num_get<wchar_t>::id,
  86     &num_put<wchar_t>::id,
  87     &numpunct<wchar_t>::id,
  88 #endif
  89     0
  90   };
  91
  92   const locale::id* const
  93   locale::_Impl::_S_id_collate[] =
  94   {
  95     &std::collate<char>::id,
  96 #ifdef _GLIBCPP_USE_WCHAR_T
  97     &std::collate<wchar_t>::id,
  98 #endif
  99     0
 100   };
 101
 102   const locale::id* const
 103   locale::_Impl::_S_id_time[] =
 104   {
 105     &__timepunct<char>::id,
 106     &time_get<char>::id,
 107     &time_put<char>::id,
 108 #ifdef _GLIBCPP_USE_WCHAR_T
 109     &__timepunct<wchar_t>::id,
 110     &time_get<wchar_t>::id,
 111     &time_put<wchar_t>::id,
 112 #endif
 113     0
 114   };
 115
 116   const locale::id* const
 117   locale::_Impl::_S_id_monetary[] =
 118   {
 119     &money_get<char>::id,
 120     &money_put<char>::id,
 121     &moneypunct<char, false>::id,
 122     &moneypunct<char, true >::id,
 123 #ifdef _GLIBCPP_USE_WCHAR_T
 124     &money_get<wchar_t>::id,
 125     &money_put<wchar_t>::id,
 126     &moneypunct<wchar_t, false>::id,
 127     &moneypunct<wchar_t, true >::id,
 128 #endif
 129     0
 130   };
 131
 132   const locale::id* const
 133   locale::_Impl::_S_id_messages[] =
 134   {
 135     &std::messages<char>::id,
 136 #ifdef _GLIBCPP_USE_WCHAR_T
 137     &std::messages<wchar_t>::id,
 138 #endif
 139     0
 140   };
 141
 142   const locale::id* const* const
 143   locale::_Impl::_S_facet_categories[] =
 144   {
 145     // Order must match the decl order in class locale.
 146     locale::_Impl::_S_id_ctype,
 147     locale::_Impl::_S_id_numeric,
 148     locale::_Impl::_S_id_collate,
 149     locale::_Impl::_S_id_monetary,
 150     locale::_Impl::_S_id_time,
 151     locale::_Impl::_S_id_messages,
 152     0
 153   };
 154
 155   locale::~locale() throw()
 156   { _M_impl->_M_remove_reference(); }
 157
 158   void
 159   locale::_M_coalesce(const locale& __base, const locale& __add,
 160                       category __cat)
 161   {
 162     __cat = _S_normalize_category(__cat);
 163     _M_impl = new _Impl(*__base._M_impl, 1);
 164
 165     try
 166       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
 167     catch (...)
 168       {
 169         _M_impl->_M_remove_reference();
 170         __throw_exception_again;
 171       }
 172   }
 173
 174   locale::locale() throw()
 175   {
 176     _S_initialize();
 177     (_M_impl = _S_global)->_M_add_reference();
 178   }
 179
 180   locale::locale(const locale& __other) throw()
 181   { (_M_impl = __other._M_impl)->_M_add_reference(); }
 182
 183   // This is used to initialize global and classic locales, and
 184   // assumes that the _Impl objects are constructed correctly.
 185   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
 186   { }
 187
 188   locale::locale(const char* __s)
 189   {
 190     if (__s)
 191       {
 192         _S_initialize();
 193         if (strcmp(__s, "C") == 0 || strcmp(__s, "POSIX") == 0)
 194           (_M_impl = _S_classic)->_M_add_reference();
 195         else if (strcmp(__s, "") == 0)
 196           {
 197             char* __env = getenv("LC_ALL");
 198             if (__env)
 199               _M_impl = new _Impl(__env, 1);
 200             else if ((__env = getenv("LANG")))
 201               _M_impl = new _Impl(__env, 1);
 202             else
 203               (_M_impl = _S_classic)->_M_add_reference();
 204           }
 205         else
 206           _M_impl = new _Impl(__s, 1);
 207       }
 208     else
 209       __throw_runtime_error("attempt to create locale from NULL name");
 210   }
 211
 212   locale::locale(const locale& __base, const char* __s, category __cat)
 213   {
 214     // NB: There are complicated, yet more efficient ways to do
 215     // this. Building up locales on a per-category way is tedious, so
 216     // let's do it this way until people complain.
 217     locale __add(__s);
 218     _M_coalesce(__base, __add, __cat);
 219   }
 220
 221   locale::locale(const locale& __base, const locale& __add, category __cat)
 222   { _M_coalesce(__base, __add, __cat); }
 223
 224   bool
 225   locale::operator==(const locale& __rhs) const throw()
 226   {
 227     string __name = this->name();
 228     return (_M_impl == __rhs._M_impl
 229             || (__name != "*" && __name == __rhs.name()));
 230   }
 231
 232   const locale&
 233   locale::operator=(const locale& __other) throw()
 234   {
 235     __other._M_impl->_M_add_reference();
 236     _M_impl->_M_remove_reference();
 237     _M_impl = __other._M_impl;
 238     return *this;
 239   }
 240
 241   locale
 242   locale::global(const locale& __other)
 243   {
 244     // XXX MT
 245     _S_initialize();
 246     _Impl* __old = _S_global;
 247     __other._M_impl->_M_add_reference();
 248     _S_global = __other._M_impl;
 249     if (_S_global->_M_check_same_name()
 250         && (strcmp(_S_global->_M_names[0], "*") != 0))
 251       setlocale(LC_ALL, __other.name().c_str());
 252
 253     // Reference count sanity check: one reference removed for the
 254     // subsition of __other locale, one added by return-by-value. Net
 255     // difference: zero. When the returned locale object's destrutor
 256     // is called, then the reference count is decremented and possibly
 257     // destroyed.
 258     return locale(__old);
 259   }
 260
 261   string
 262   locale::name() const
 263   {
 264     // Need some kind of separator character. This one was pretty much
 265     // arbitrarily chosen as to not conflict with glibc locales: the
 266     // exact formatting is not set in stone.
 267     const char __separator = '|';
 268
 269     string __ret;
 270     if (_M_impl->_M_check_same_name())
 271       __ret = _M_impl->_M_names[0];
 272     else
 273       {
 274         for (size_t i = 0; i < _S_num_categories; ++i)
 275           {
 276             __ret += __separator;
 277             __ret += _M_impl->_M_names[i];
 278           }
 279       }
 280     return __ret;
 281   }
 282
 283   const locale&
 284   locale::classic()
 285   {
 286     static _STL_mutex_lock __lock __STL_MUTEX_INITIALIZER;
 287     _STL_auto_lock __auto(__lock);
 288
 289     if (!_S_classic)
 290       {
 291         try
 292           {
 293             // 26 Standard facets, 2 references.
 294             // One reference for _M_classic, one for _M_global
 295             facet** f = new(&facet_vec) facet*[_GLIBCPP_NUM_FACETS];
 296             for (size_t __i = 0; __i < _GLIBCPP_NUM_FACETS; ++__i)
 297               f[__i] = 0;
 298
 299             _S_classic = new (&c_locale_impl) _Impl(f, 2, true);
 300             _S_global = _S_classic;
 301             new (&c_locale) locale(_S_classic);
 302           }
 303         catch(...)
 304           {
 305             // Just call destructor, so that locale_impl_c's memory is
 306             // not deallocated via a call to delete.
 307             if (_S_classic)
 308               _S_classic->~_Impl();
 309             _S_classic = _S_global = 0;
 310             __throw_exception_again;
 311           }
 312       }
 313     return c_locale;
 314   }
 315
 316   locale::category
 317   locale::_S_normalize_category(category __cat)
 318   {
 319     int __ret = 0;
 320     if (__cat == none || (__cat & all) && !(__cat & ~all))
 321       __ret = __cat;
 322     else
 323       {
 324         // NB: May be a C-style "LC_ALL" category; convert.
 325         switch (__cat)
 326           {
 327           case LC_COLLATE:
 328             __ret = collate;
 329             break;
 330           case LC_CTYPE:
 331             __ret = ctype;
 332             break;
 333           case LC_MONETARY:
 334             __ret = monetary;
 335             break;
 336           case LC_NUMERIC:
 337             __ret = numeric;
 338             break;
 339           case LC_TIME:
 340             __ret = time;
 341             break;
 342 #ifdef _GLIBCPP_HAVE_LC_MESSAGES
 343           case LC_MESSAGES:
 344             __ret = messages;
 345             break;
 346 #endif
 347           case LC_ALL:
 348             __ret = all;
 349             break;
 350           default:
 351             __throw_runtime_error("bad locale category");
 352           }
 353       }
 354     return __ret;
 355   }
 356
 357   __c_locale
 358   locale::facet::_S_c_locale;
 359
 360   locale::facet::
 361   ~facet() { }
 362
 363   locale::facet::
 364   facet(size_t __refs) throw() : _M_references(__refs)
 365   {
 366     if (!_S_c_locale)
 367       _S_create_c_locale(_S_c_locale, "C");
 368   }
 369
 370   void
 371   locale::facet::
 372   _M_add_reference() throw()
 373   { __atomic_add(&_M_references, 1); }
 374
 375   void
 376   locale::facet::
 377   _M_remove_reference() throw()
 378   {
 379     if (__exchange_and_add(&_M_references, -1) == 0)
 380       {
 381         try
 382           { delete this; }
 383         catch (...)
 384           { }
 385       }
 386   }
 387
 388   locale::id::id()
 389   { }
 390
 391   // Definitions for static const data members of time_base
 392   template<>
 393     const char*
 394     __timepunct<char>::_S_timezones[14] =
 395     {
 396       "GMT", "HST", "AKST", "PST", "MST", "CST", "EST", "AST", "NST", "CET",
 397       "IST", "EET", "CST", "JST"
 398     };
 399
 400 #ifdef _GLIBCPP_USE_WCHAR_T
 401   template<>
 402     const wchar_t*
 403     __timepunct<wchar_t>::_S_timezones[14] =
 404     {
 405       L"GMT", L"HST", L"AKST", L"PST", L"MST", L"CST", L"EST", L"AST",
 406       L"NST", L"CET", L"IST", L"EET", L"CST", L"JST"
 407     };
 408 #endif
 409
 410   // Definitions for static const data members of money_base
 411   const money_base::pattern
 412   money_base::_S_default_pattern =  { {symbol, sign, none, value} };
 413
 414   const char __num_base::_S_atoms[] = "0123456789eEabcdfABCDF";
 415
 416   bool
 417   __num_base::_S_format_float(const ios_base& __io, char* __fptr, char __mod,
 418                               streamsize __prec)
 419   {
 420     bool __incl_prec = false;
 421     ios_base::fmtflags __flags = __io.flags();
 422     *__fptr++ = '%';
 423     // [22.2.2.2.2] Table 60
 424     if (__flags & ios_base::showpos)
 425       *__fptr++ = '+';
 426     if (__flags & ios_base::showpoint)
 427       *__fptr++ = '#';
 428     // As per [22.2.2.2.2.11]
 429     if (__flags & ios_base::fixed || __prec > 0)
 430       {
 431         *__fptr++ = '.';
 432         *__fptr++ = '*';
 433         __incl_prec = true;
 434       }
 435     if (__mod)
 436       *__fptr++ = __mod;
 437     ios_base::fmtflags __fltfield = __flags & ios_base::floatfield;
 438     // [22.2.2.2.2] Table 58
 439     if (__fltfield == ios_base::fixed)
 440       *__fptr++ = 'f';
 441     else if (__fltfield == ios_base::scientific)
 442       *__fptr++ = (__flags & ios_base::uppercase) ? 'E' : 'e';
 443     else
 444       *__fptr++ = (__flags & ios_base::uppercase) ? 'G' : 'g';
 445     *__fptr = '\0';
 446     return __incl_prec;
 447   }
 448
 449   void
 450   __num_base::_S_format_int(const ios_base& __io, char* __fptr, char __mod,
 451                             char __modl)
 452   {
 453     ios_base::fmtflags __flags = __io.flags();
 454     *__fptr++ = '%';
 455     // [22.2.2.2.2] Table 60
 456     if (__flags & ios_base::showpos)
 457       *__fptr++ = '+';
 458     if (__flags & ios_base::showbase)
 459       *__fptr++ = '#';
 460     *__fptr++ = 'l';
 461
 462     // For long long types.
 463     if (__modl)
 464       *__fptr++ = __modl;
 465
 466     ios_base::fmtflags __bsefield = __flags & ios_base::basefield;
 467     if (__bsefield == ios_base::hex)
 468       *__fptr++ = (__flags & ios_base::uppercase) ? 'X' : 'x';
 469     else if (__bsefield == ios_base::oct)
 470       *__fptr++ = 'o';
 471     else
 472       *__fptr++ = __mod;
 473     *__fptr = '\0';
 474   }
 475 } // namespace std
 476