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
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   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
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  13 // GNU General Public License for more details.
  14
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  16 // with this library; see the file COPYING.  If not, write to the Free
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  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 <cctype>
  32 #include <cwctype>     // For towupper, etc.
  33 #include <locale>
  34 #include <bits/atomicity.h>
  35
  36 namespace __gnu_cxx
  37 {
  38   // Defined in globals.cc.
  39   extern std::locale            c_locale;
  40   extern std::locale::_Impl     c_locale_impl;
  41 } // namespace __gnu_cxx
  42
  43 namespace std
  44 {
  45   using namespace __gnu_cxx;
  46
  47   // Definitions for static const data members of locale.
  48   const locale::category        locale::none;
  49   const locale::category        locale::ctype;
  50   const locale::category        locale::numeric;
  51   const locale::category        locale::collate;
  52   const locale::category        locale::time;
  53   const locale::category        locale::monetary;
  54   const locale::category        locale::messages;
  55   const locale::category        locale::all;
  56
  57   // In the future, GLIBCXX_ABI > 5 should remove all uses of
  58   // _GLIBCPP_ASM_SYMVER in this file, and remove exports of any
  59   // static data members of locale.
  60
  61   // These are no longer exported.
  62   locale::_Impl*                locale::_S_classic;
  63   locale::_Impl*                locale::_S_global;
  64   const size_t                  locale::_S_categories_size;
  65
  66   // Definitions for static const data members of locale::id
  67   _Atomic_word locale::id::_S_highwater;  // init'd to 0 by linker
  68
  69   // Definitions for static const data members of locale::_Impl
  70   const locale::id* const
  71   locale::_Impl::_S_id_ctype[] =
  72   {
  73     &std::ctype<char>::id,
  74     &codecvt<char, char, mbstate_t>::id,
  75 #ifdef _GLIBCPP_USE_WCHAR_T
  76     &std::ctype<wchar_t>::id,
  77     &codecvt<wchar_t, char, mbstate_t>::id,
  78 #endif
  79     0
  80   };
  81
  82   const locale::id* const
  83   locale::_Impl::_S_id_numeric[] =
  84   {
  85     &num_get<char>::id,
  86     &num_put<char>::id,
  87     &numpunct<char>::id,
  88 #ifdef _GLIBCPP_USE_WCHAR_T
  89     &num_get<wchar_t>::id,
  90     &num_put<wchar_t>::id,
  91     &numpunct<wchar_t>::id,
  92 #endif
  93     0
  94   };
  95
  96   const locale::id* const
  97   locale::_Impl::_S_id_collate[] =
  98   {
  99     &std::collate<char>::id,
 100 #ifdef _GLIBCPP_USE_WCHAR_T
 101     &std::collate<wchar_t>::id,
 102 #endif
 103     0
 104   };
 105
 106   const locale::id* const
 107   locale::_Impl::_S_id_time[] =
 108   {
 109     &__timepunct<char>::id,
 110     &time_get<char>::id,
 111     &time_put<char>::id,
 112 #ifdef _GLIBCPP_USE_WCHAR_T
 113     &__timepunct<wchar_t>::id,
 114     &time_get<wchar_t>::id,
 115     &time_put<wchar_t>::id,
 116 #endif
 117     0
 118   };
 119
 120   const locale::id* const
 121   locale::_Impl::_S_id_monetary[] =
 122   {
 123     &money_get<char>::id,
 124     &money_put<char>::id,
 125     &moneypunct<char, false>::id,
 126     &moneypunct<char, true >::id,
 127 #ifdef _GLIBCPP_USE_WCHAR_T
 128     &money_get<wchar_t>::id,
 129     &money_put<wchar_t>::id,
 130     &moneypunct<wchar_t, false>::id,
 131     &moneypunct<wchar_t, true >::id,
 132 #endif
 133     0
 134   };
 135
 136   const locale::id* const
 137   locale::_Impl::_S_id_messages[] =
 138   {
 139     &std::messages<char>::id,
 140 #ifdef _GLIBCPP_USE_WCHAR_T
 141     &std::messages<wchar_t>::id,
 142 #endif
 143     0
 144   };
 145
 146   const locale::id* const* const
 147   locale::_Impl::_S_facet_categories[] =
 148   {
 149     // Order must match the decl order in class locale.
 150     locale::_Impl::_S_id_ctype,
 151     locale::_Impl::_S_id_numeric,
 152     locale::_Impl::_S_id_collate,
 153     locale::_Impl::_S_id_time,
 154     locale::_Impl::_S_id_monetary,
 155     locale::_Impl::_S_id_messages,
 156     0
 157   };
 158
 159   locale::locale() throw()
 160   {
 161     _S_initialize();
 162     (_M_impl = _S_global)->_M_add_reference();
 163   }
 164
 165   locale::locale(const locale& __other) throw()
 166   { (_M_impl = __other._M_impl)->_M_add_reference(); }
 167
 168   // This is used to initialize global and classic locales, and
 169   // assumes that the _Impl objects are constructed correctly.
 170   // The lack of a reference increment is intentional.
 171   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
 172   { }
 173
 174   locale::locale(const char* __s)
 175   {
 176     if (__s)
 177       {
 178         _S_initialize();
 179         if (strcmp(__s, "C") == 0 || strcmp(__s, "POSIX") == 0)
 180           (_M_impl = _S_classic)->_M_add_reference();
 181         else if (strcmp(__s, "") != 0)
 182           _M_impl = new _Impl(__s, 1);
 183         else
 184           {
 185             // Get it from the environment.
 186             char* __env = getenv("LC_ALL");
 187             // If LC_ALL is set we are done.
 188             if (__env && strcmp(__env, "") != 0)
 189               {
 190                 if (strcmp(__env, "C") == 0 || strcmp(__env, "POSIX") == 0)
 191                   (_M_impl = _S_classic)->_M_add_reference();
 192                 else
 193                   _M_impl = new _Impl(__env, 1);
 194               }
 195             else
 196               {
 197                 char* __res;
 198                 // LANG may set a default different from "C".
 199                 char* __env = getenv("LANG");
 200                 if (!__env || strcmp(__env, "") == 0 || strcmp(__env, "C") == 0
 201                     || strcmp(__env, "POSIX") == 0)
 202                   __res = strdup("C");
 203                 else
 204                   __res = strdup(__env);
 205
 206                 // Scan the categories looking for the first one
 207                 // different from LANG.
 208                 size_t __i = 0;
 209                 if (strcmp(__res, "C") == 0)
 210                   for (; __i < _S_categories_size; ++__i)
 211                     {
 212                       __env = getenv(_S_categories[__i]);
 213                       if (__env && strcmp(__env, "") != 0
 214                           && strcmp(__env, "C") != 0
 215                           && strcmp(__env, "POSIX") != 0)
 216                         break;
 217                     }
 218                 else
 219                   for (; __i < _S_categories_size; ++__i)
 220                     {
 221                       __env = getenv(_S_categories[__i]);
 222                       if (__env && strcmp(__env, "") != 0
 223                           && strcmp(__env, __res) != 0)
 224                         break;
 225                     }
 226
 227                 // If one is found, build the complete string of
 228                 // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...
 229                 if (__i < _S_categories_size)
 230                   {
 231                     string __str;
 232                     for (size_t __j = 0; __j < __i; ++__j)
 233                       {
 234                         __str += _S_categories[__j];
 235                         __str += '=';
 236                         __str += __res;
 237                         __str += ';';
 238                       }
 239                     __str += _S_categories[__i];
 240                     __str += '=';
 241                     __str += __env;
 242                     __str += ';';
 243                     __i++;
 244                     for (; __i < _S_categories_size; ++__i)
 245                       {
 246                         __env = getenv(_S_categories[__i]);
 247                         if (!__env || strcmp(__env, "") == 0)
 248                           {
 249                             __str += _S_categories[__i];
 250                             __str += '=';
 251                             __str += __res;
 252                             __str += ';';
 253                           }
 254                         else if (strcmp(__env, "C") == 0
 255                                  || strcmp(__env, "POSIX") == 0)
 256                           {
 257                             __str += _S_categories[__i];
 258                             __str += "=C;";
 259                           }
 260                         else
 261                           {
 262                             __str += _S_categories[__i];
 263                             __str += '=';
 264                             __str += __env;
 265                             __str += ';';
 266                           }
 267                       }
 268                     __str.erase(__str.end() - 1);
 269                     _M_impl = new _Impl(__str.c_str(), 1);
 270                   }
 271                 // ... otherwise either an additional instance of
 272                 // the "C" locale or LANG.
 273                 else if (strcmp(__res, "C") == 0)
 274                   (_M_impl = _S_classic)->_M_add_reference();
 275                 else
 276                   _M_impl = new _Impl(__res, 1);
 277                 free(__res);
 278               }
 279           }
 280       }
 281     else
 282       __throw_runtime_error("locale::locale NULL not valid");
 283   }
 284
 285   locale::locale(const locale& __base, const char* __s, category __cat)
 286   {
 287     // NB: There are complicated, yet more efficient ways to do
 288     // this. Building up locales on a per-category way is tedious, so
 289     // let's do it this way until people complain.
 290     locale __add(__s);
 291     _M_coalesce(__base, __add, __cat);
 292   }
 293
 294   locale::locale(const locale& __base, const locale& __add, category __cat)
 295   { _M_coalesce(__base, __add, __cat); }
 296
 297   locale::~locale() throw()
 298   { _M_impl->_M_remove_reference(); }
 299
 300   bool
 301   locale::operator==(const locale& __rhs) const throw()
 302   {
 303     string __name = this->name();
 304     return (_M_impl == __rhs._M_impl
 305             || (__name != "*" && __name == __rhs.name()));
 306   }
 307
 308   const locale&
 309   locale::operator=(const locale& __other) throw()
 310   {
 311     __other._M_impl->_M_add_reference();
 312     _M_impl->_M_remove_reference();
 313     _M_impl = __other._M_impl;
 314     return *this;
 315   }
 316
 317   locale
 318   locale::global(const locale& __other)
 319   {
 320     // XXX MT
 321     _S_initialize();
 322     _Impl* __old = _S_global;
 323     __other._M_impl->_M_add_reference();
 324     _S_global = __other._M_impl;
 325     if (_S_global->_M_check_same_name()
 326         && (strcmp(_S_global->_M_names[0], "*") != 0))
 327       setlocale(LC_ALL, __other.name().c_str());
 328
 329     // Reference count sanity check: one reference removed for the
 330     // subsition of __other locale, one added by return-by-value. Net
 331     // difference: zero. When the returned locale object's destrutor
 332     // is called, then the reference count is decremented and possibly
 333     // destroyed.
 334     return locale(__old);
 335   }
 336
 337   string
 338   locale::name() const
 339   {
 340     string __ret;
 341     if (_M_impl->_M_check_same_name())
 342       __ret = _M_impl->_M_names[0];
 343     else
 344       {
 345         __ret += _S_categories[0];
 346         __ret += '=';
 347         __ret += _M_impl->_M_names[0];
 348         for (size_t __i = 1; __i < _S_categories_size; ++__i)
 349           {
 350             __ret += ';';
 351             __ret += _S_categories[__i];
 352             __ret += '=';
 353             __ret += _M_impl->_M_names[__i];
 354           }
 355       }
 356     return __ret;
 357   }
 358
 359   const locale&
 360   locale::classic()
 361   {
 362     // Locking protocol: singleton-called-before-threading-starts
 363     if (!_S_classic)
 364       {
 365         try
 366           {
 367             // 26 Standard facets, 2 references.
 368             // One reference for _S_classic, one for _S_global
 369             _S_classic = new (&c_locale_impl) _Impl(0, 2, true);
 370             _S_global = _S_classic;
 371             new (&c_locale) locale(_S_classic);
 372           }
 373         catch(...)
 374           {
 375             // Just call destructor, so that locale_impl_c's memory is
 376             // not deallocated via a call to delete.
 377             if (_S_classic)
 378               _S_classic->~_Impl();
 379             _S_classic = _S_global = 0;
 380             __throw_exception_again;
 381           }
 382       }
 383     return c_locale;
 384   }
 385
 386   void
 387   locale::_M_coalesce(const locale& __base, const locale& __add,
 388                       category __cat)
 389   {
 390     __cat = _S_normalize_category(__cat);
 391     _M_impl = new _Impl(*__base._M_impl, 1);
 392
 393     try
 394       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
 395     catch (...)
 396       {
 397         _M_impl->_M_remove_reference();
 398         __throw_exception_again;
 399       }
 400   }
 401
 402   locale::category
 403   locale::_S_normalize_category(category __cat)
 404   {
 405     int __ret = 0;
 406     if (__cat == none || (__cat & all) && !(__cat & ~all))
 407       __ret = __cat;
 408     else
 409       {
 410         // NB: May be a C-style "LC_ALL" category; convert.
 411         switch (__cat)
 412           {
 413           case LC_COLLATE:
 414             __ret = collate;
 415             break;
 416           case LC_CTYPE:
 417             __ret = ctype;
 418             break;
 419           case LC_MONETARY:
 420             __ret = monetary;
 421             break;
 422           case LC_NUMERIC:
 423             __ret = numeric;
 424             break;
 425           case LC_TIME:
 426             __ret = time;
 427             break;
 428 #ifdef _GLIBCPP_HAVE_LC_MESSAGES
 429           case LC_MESSAGES:
 430             __ret = messages;
 431             break;
 432 #endif
 433           case LC_ALL:
 434             __ret = all;
 435             break;
 436           default:
 437             __throw_runtime_error("locale::_S_normalize_category "
 438                                   "category not found");
 439           }
 440       }
 441     return __ret;
 442   }
 443
 444   __c_locale
 445   locale::facet::_S_c_locale;
 446
 447   char locale::facet::_S_c_name[2];
 448
 449   locale::facet::
 450   ~facet() { }
 451
 452   template<>
 453     const __numpunct_cache<char>&
 454     __use_cache(const locale& __loc)
 455     {
 456       size_t __i = numpunct<char>::id._M_id();
 457       const locale::facet** __caches = __loc._M_impl->_M_caches;
 458       if (!__caches[__i])
 459         {
 460           __numpunct_cache<char>* __tmp = new __numpunct_cache<char>;
 461           __tmp->_M_cache(__loc);
 462           __loc._M_impl->_M_install_cache(__tmp, __i);
 463         }
 464       return static_cast<const __numpunct_cache<char>&>(*__caches[__i]);
 465     }
 466
 467 #ifdef _GLIBCPP_USE_WCHAR_T
 468   template<>
 469     const __numpunct_cache<wchar_t>&
 470     __use_cache(const locale& __loc)
 471     {
 472       size_t __i = numpunct<wchar_t>::id._M_id();
 473       const locale::facet** __caches = __loc._M_impl->_M_caches;
 474       if (!__caches[__i])
 475         {
 476           __numpunct_cache<wchar_t>* __tmp = new __numpunct_cache<wchar_t>;
 477           __tmp->_M_cache(__loc);
 478           __loc._M_impl->_M_install_cache(__tmp, __i);
 479         }
 480       return static_cast<const __numpunct_cache<wchar_t>&>(*__caches[__i]);
 481     }
 482 #endif
 483
 484   // Definitions for static const data members of time_base
 485   template<>
 486     const char*
 487     __timepunct<char>::_S_timezones[14] =
 488     {
 489       "GMT", "HST", "AKST", "PST", "MST", "CST", "EST", "AST", "NST", "CET",
 490       "IST", "EET", "CST", "JST"
 491     };
 492
 493 #ifdef _GLIBCPP_USE_WCHAR_T
 494   template<>
 495     const wchar_t*
 496     __timepunct<wchar_t>::_S_timezones[14] =
 497     {
 498       L"GMT", L"HST", L"AKST", L"PST", L"MST", L"CST", L"EST", L"AST",
 499       L"NST", L"CET", L"IST", L"EET", L"CST", L"JST"
 500     };
 501 #endif
 502
 503   // Definitions for static const data members of money_base
 504   const money_base::pattern
 505   money_base::_S_default_pattern =  { {symbol, sign, none, value} };
 506
 507   const char* __num_base::_S_atoms_in = "0123456789eEabcdfABCDF";
 508   const char* __num_base::_S_atoms_out ="-+xX0123456789abcdef0123456789ABCDEF";
 509
 510   // _GLIBCPP_RESOLVE_LIB_DEFECTS
 511   // According to the resolution of DR 231, about 22.2.2.2.2, p11,
 512   // "str.precision() is specified in the conversion specification".
 513   void
 514   __num_base::_S_format_float(const ios_base& __io, char* __fptr, char __mod)
 515   {
 516     ios_base::fmtflags __flags = __io.flags();
 517     *__fptr++ = '%';
 518     // [22.2.2.2.2] Table 60
 519     if (__flags & ios_base::showpos)
 520       *__fptr++ = '+';
 521     if (__flags & ios_base::showpoint)
 522       *__fptr++ = '#';
 523
 524     // As per DR 231: _always_, not only when
 525     // __flags & ios_base::fixed || __prec > 0
 526     *__fptr++ = '.';
 527     *__fptr++ = '*';
 528
 529     if (__mod)
 530       *__fptr++ = __mod;
 531     ios_base::fmtflags __fltfield = __flags & ios_base::floatfield;
 532     // [22.2.2.2.2] Table 58
 533     if (__fltfield == ios_base::fixed)
 534       *__fptr++ = 'f';
 535     else if (__fltfield == ios_base::scientific)
 536       *__fptr++ = (__flags & ios_base::uppercase) ? 'E' : 'e';
 537     else
 538       *__fptr++ = (__flags & ios_base::uppercase) ? 'G' : 'g';
 539     *__fptr = '\0';
 540   }
 541 } // namespace std
 542