libstdc++-v3/src/locale.cc

   1 // Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 2, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING.  If not, write to the Free
  16 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // As a special exception, you may use this file as part of a free software
  20 // library without restriction.  Specifically, if other files instantiate
  21 // templates or use macros or inline functions from this file, or you compile
  22 // this file and link it with other files to produce an executable, this
  23 // file does not by itself cause the resulting executable to be covered by
  24 // the GNU General Public License.  This exception does not however
  25 // invalidate any other reasons why the executable file might be covered by
  26 // the GNU General Public License.
  27
  28 #include <clocale>
  29 #include <cstring>
  30 #include <cassert>
  31 #include <cctype>
  32 #include <limits>
  33 #include <exception>
  34 #include <stdexcept>
  35 #include <locale>
  36 #include <istream>
  37 #include <ostream>
  38 #include <vector>
  39 #include <memory>      // for auto_ptr
  40 #ifdef _GLIBCPP_USE_WCHAR_T
  41 # include <cwctype>     // for towupper, etc.
  42 #endif
  43
  44 namespace std
  45 {
  46   // Defined in globals.cc.
  47   extern locale::_Impl locale_impl_c;
  48   extern locale locale_c;
  49
  50   // Definitions for static const data members of locale.
  51   const locale::category        locale::none;
  52   const locale::category        locale::ctype;
  53   const locale::category        locale::numeric;
  54   const locale::category        locale::collate;
  55   const locale::category        locale::time;
  56   const locale::category        locale::monetary;
  57   const locale::category        locale::messages;
  58   const locale::category        locale::all;
  59
  60   locale::_Impl*                locale::_S_classic;
  61   locale::_Impl*                locale::_S_global;
  62   const size_t                  locale::_S_num_categories;
  63   const size_t                  locale::_S_num_facets;
  64
  65   // Definitions for locale::id of standard facets.
  66   locale::id ctype<char>::id;
  67   locale::id codecvt<char, char, mbstate_t>::id;
  68
  69 #ifdef _GLIBCPP_USE_WCHAR_T
  70   locale::id ctype<wchar_t>::id;
  71   locale::id codecvt<wchar_t, char, mbstate_t>::id;
  72 #endif
  73
  74   // Definitions for static const data members of locale::id
  75   size_t locale::id::_S_highwater;  // init'd to 0 by linker
  76
  77   // Definitions for static const data members of locale::_Impl
  78   const locale::id* const
  79   locale::_Impl::_S_id_ctype[] =
  80   {
  81     &std::ctype<char>::id,
  82     &codecvt<char, char, mbstate_t>::id,
  83 #ifdef _GLIBCPP_USE_WCHAR_T
  84     &std::ctype<wchar_t>::id,
  85     &codecvt<wchar_t, char, mbstate_t>::id,
  86 #endif
  87     0
  88   };
  89
  90   const locale::id* const
  91   locale::_Impl::_S_id_numeric[] =
  92   {
  93     &num_get<char>::id,
  94     &num_put<char>::id,
  95     &numpunct<char>::id,
  96 #ifdef _GLIBCPP_USE_WCHAR_T
  97     &num_get<wchar_t>::id,
  98     &num_put<wchar_t>::id,
  99     &numpunct<wchar_t>::id,
 100 #endif
 101     0
 102   };
 103
 104   const locale::id* const
 105   locale::_Impl::_S_id_collate[] =
 106   {
 107     &std::collate<char>::id,
 108 #ifdef _GLIBCPP_USE_WCHAR_T
 109     &std::collate<wchar_t>::id,
 110 #endif
 111     0
 112   };
 113
 114   const locale::id* const
 115   locale::_Impl::_S_id_time[] =
 116   {
 117     &__timepunct<char>::id,
 118     &time_get<char>::id,
 119     &time_put<char>::id,
 120 #ifdef _GLIBCPP_USE_WCHAR_T
 121     &__timepunct<wchar_t>::id,
 122     &time_get<wchar_t>::id,
 123     &time_put<wchar_t>::id,
 124 #endif
 125     0
 126   };
 127
 128   const locale::id* const
 129   locale::_Impl::_S_id_monetary[] =
 130   {
 131     &money_get<char>::id,
 132     &money_put<char>::id,
 133     &moneypunct<char, false>::id,
 134     &moneypunct<char, true >::id,
 135 #ifdef _GLIBCPP_USE_WCHAR_T
 136     &money_get<wchar_t>::id,
 137     &money_put<wchar_t>::id,
 138     &moneypunct<wchar_t, false>::id,
 139     &moneypunct<wchar_t, true >::id,
 140 #endif
 141     0
 142   };
 143
 144   const locale::id* const
 145   locale::_Impl::_S_id_messages[] =
 146   {
 147     &std::messages<char>::id,
 148 #ifdef _GLIBCPP_USE_WCHAR_T
 149     &std::messages<wchar_t>::id,
 150 #endif
 151     0
 152   };
 153
 154   const locale::id* const* const
 155   locale::_Impl::_S_facet_categories[] =
 156   {
 157     // Order must match the decl order in class locale.
 158     locale::_Impl::_S_id_ctype,
 159     locale::_Impl::_S_id_numeric,
 160     locale::_Impl::_S_id_collate,
 161     locale::_Impl::_S_id_time,
 162     locale::_Impl::_S_id_monetary,
 163     locale::_Impl::_S_id_messages,
 164     0
 165   };
 166
 167   locale::~locale() throw()
 168   { _M_impl->_M_remove_reference(); }
 169
 170   void
 171   locale::_M_coalesce(const locale& __base, const locale& __add,
 172                       category __cat)
 173   {
 174     __cat = _S_normalize_category(__cat);
 175     _M_impl = new _Impl(*__base._M_impl, 1);
 176
 177     try
 178       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
 179     catch (...)
 180       {
 181         _M_impl->_M_remove_reference();
 182         __throw_exception_again;
 183       }
 184   }
 185
 186   locale::locale() throw()
 187   {
 188     _S_initialize();
 189     (_M_impl = _S_global)->_M_add_reference();
 190   } // XXX MT
 191
 192   locale::locale(const locale& __other) throw()
 193   { (_M_impl = __other._M_impl)->_M_add_reference(); }
 194
 195   // This is used to initialize global and classic locales, and
 196   // assumes that the _Impl objects are constructed correctly.
 197   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
 198   { }
 199
 200   locale::locale(const char* __s)
 201   {
 202     if (__s)
 203       {
 204         _S_initialize();
 205         if (strcmp(__s, "C") == 0 || strcmp(__s, "POSIX") == 0)
 206           (_M_impl = _S_classic)->_M_add_reference();
 207         else if (strcmp(__s, "") == 0)
 208           _M_impl = new _Impl(setlocale(LC_ALL, __s), 1);
 209         else
 210           _M_impl = new _Impl(__s, 1);
 211       }
 212     else
 213       __throw_runtime_error("attempt to create locale from NULL name");
 214   }
 215
 216   locale::locale(const locale& __base, const char* __s, category __cat)
 217   {
 218     // NB: There are complicated, yet more efficient ways to do
 219     // this. Building up locales on a per-category way is tedious, so
 220     // let's do it this way until people complain.
 221     locale __add(__s);
 222     _M_coalesce(__base, __add, __cat);
 223   }
 224
 225   locale::locale(const locale& __base, const locale& __add, category __cat)
 226   { _M_coalesce(__base, __add, __cat); }
 227
 228   bool
 229   locale::operator==(const locale& __rhs) const throw()
 230   {
 231     string __name = this->name();
 232     return (_M_impl == __rhs._M_impl
 233             || (__name != "*" && __name == __rhs.name()));
 234   }
 235
 236   const locale&
 237   locale::operator=(const locale& __other) throw()
 238   {
 239     __other._M_impl->_M_add_reference();
 240     _M_impl->_M_remove_reference();
 241     _M_impl = __other._M_impl;
 242     return *this;
 243   }
 244
 245   locale
 246   locale::global(const locale& __other)
 247   {
 248     // XXX MT
 249     _S_initialize();
 250     _Impl* __old = _S_global;
 251     __other._M_impl->_M_add_reference();
 252     _S_global = __other._M_impl;
 253     if (_S_global->_M_check_same_name() && _S_global->_M_names[0] != "*")
 254       setlocale(LC_ALL, __other.name().c_str());
 255
 256     // Reference count sanity check: one reference removed for the
 257     // subsition of __other locale, one added by return-by-value. Net
 258     // difference: zero. When the returned locale object's destrutor
 259     // is called, then the reference count is decremented and possibly
 260     // destroyed.
 261     return locale(__old);
 262   }
 263
 264   string
 265   locale::name() const
 266   {
 267     string __ret;
 268     // Need some kind of separator character. This one was pretty much
 269     // arbitrarily chosen as to not conflict with glibc locales: the
 270     // exact formatting is not set in stone.
 271     const char __separator = '|';
 272
 273     if (_M_impl->_M_check_same_name())
 274       __ret = _M_impl->_M_names[0];
 275     else
 276       {
 277         for (size_t i = 0; i < _S_num_categories; ++i)
 278           __ret += __separator + _M_impl->_M_names[i];
 279       }
 280     return __ret;
 281   }
 282
 283   locale const&
 284   locale::classic()
 285   {
 286     // XXX MT
 287     if (!_S_classic)
 288       {
 289         try
 290           {
 291             // 26 Standard facets, 2 references.
 292             // One reference for _M_classic, one for _M_global
 293             _S_classic = new (&locale_impl_c) _Impl("C", 2);
 294             _S_global = _S_classic;
 295             new (&locale_c) locale(_S_classic);
 296           }
 297         catch(...)
 298           {
 299             // Just call destructor, so that locale_impl_c's memory is
 300             // not deallocated via a call to delete.
 301             if (_S_classic)
 302               _S_classic->~_Impl();
 303             _S_classic = _S_global = 0;
 304             __throw_exception_again;
 305           }
 306       }
 307     return locale_c;
 308   }
 309
 310   locale::category
 311   locale::_S_normalize_category(category __cat)
 312   {
 313     int __ret = 0;
 314     if (__cat == none || (__cat & all) && !(__cat & ~all))
 315       __ret = __cat;
 316     else
 317       {
 318         // NB: May be a C-style "LC_ALL" category; convert.
 319         switch (__cat)
 320           {
 321           case LC_COLLATE:
 322             __ret = collate;
 323             break;
 324           case LC_CTYPE:
 325             __ret = ctype;
 326             break;
 327           case LC_MONETARY:
 328             __ret = monetary;
 329             break;
 330           case LC_NUMERIC:
 331             __ret = numeric;
 332             break;
 333           case LC_TIME:
 334             __ret = time;
 335             break;
 336 #ifdef _GLIBCPP_HAVE_LC_MESSAGES
 337           case LC_MESSAGES:
 338             __ret = messages;
 339             break;
 340 #endif
 341           case LC_ALL:
 342             __ret = all;
 343             break;
 344           default:
 345             __throw_runtime_error("bad locale category");
 346           }
 347       }
 348     return __ret;
 349   }
 350
 351   __c_locale
 352   locale::facet::_S_c_locale;
 353
 354   locale::facet::
 355   ~facet() { }
 356
 357   locale::facet::
 358   facet(size_t __refs) throw() : _M_references(__refs)
 359   {
 360     if (!_S_c_locale)
 361       _S_create_c_locale(_S_c_locale, "C");
 362   }
 363
 364   void
 365   locale::facet::
 366   _M_add_reference() throw()
 367   { ++_M_references; }  // XXX MT
 368
 369   void
 370   locale::facet::
 371   _M_remove_reference() throw()
 372   {
 373     if (_M_references-- == 0)
 374       {
 375         try
 376           { delete this; }
 377         catch (...)
 378           { }
 379       }
 380   }
 381
 382   locale::id::id() { }
 383
 384   // Definitions for static const data members of ctype_base.
 385   const ctype_base::mask ctype_base::space;
 386   const ctype_base::mask ctype_base::print;
 387   const ctype_base::mask ctype_base::cntrl;
 388   const ctype_base::mask ctype_base::upper;
 389   const ctype_base::mask ctype_base::lower;
 390   const ctype_base::mask ctype_base::alpha;
 391   const ctype_base::mask ctype_base::digit;
 392   const ctype_base::mask ctype_base::punct;
 393   const ctype_base::mask ctype_base::xdigit;
 394   const ctype_base::mask ctype_base::alnum;
 395   const ctype_base::mask ctype_base::graph;
 396
 397   // Platform-specific initialization code for ctype tables.
 398   #include <bits/ctype_noninline.h>
 399
 400   const size_t ctype<char>::table_size;
 401
 402   ctype<char>::~ctype()
 403   {
 404     if (_M_c_locale_ctype)
 405       _S_destroy_c_locale(_M_c_locale_ctype);
 406     if (_M_del)
 407       delete[] this->table();
 408   }
 409
 410   // These are dummy placeholders as these virtual functions are never called.
 411   bool
 412   ctype<char>::do_is(mask, char_type) const
 413   { return false; }
 414
 415   const char*
 416   ctype<char>::do_is(const char_type* __c, const char_type*, mask*) const
 417   { return __c; }
 418
 419   const char*
 420   ctype<char>::do_scan_is(mask, const char_type* __c, const char_type*) const
 421   { return __c; }
 422
 423   const char*
 424   ctype<char>::do_scan_not(mask, const char_type* __c, const char_type*) const
 425   { return __c; }
 426
 427   char
 428   ctype<char>::do_widen(char __c) const
 429   { return __c; }
 430
 431   const char*
 432   ctype<char>::do_widen(const char* __lo, const char* __hi, char* __dest) const
 433   {
 434     memcpy(__dest, __lo, __hi - __lo);
 435     return __hi;
 436   }
 437
 438   char
 439   ctype<char>::do_narrow(char __c, char /*__dfault*/) const
 440   { return __c; }
 441
 442   const char*
 443   ctype<char>::do_narrow(const char* __lo, const char* __hi,
 444                          char /*__dfault*/, char* __dest) const
 445   {
 446     memcpy(__dest, __lo, __hi - __lo);
 447     return __hi;
 448   }
 449
 450 #ifdef _GLIBCPP_USE_WCHAR_T
 451   ctype<wchar_t>::ctype(size_t __refs)
 452   : __ctype_abstract_base<wchar_t>(__refs)
 453   { _M_c_locale_ctype = _S_clone_c_locale(_S_c_locale); }
 454
 455   ctype<wchar_t>::ctype(__c_locale __cloc, size_t __refs)
 456   : __ctype_abstract_base<wchar_t>(__refs)
 457   { _M_c_locale_ctype = _S_clone_c_locale(__cloc); }
 458
 459   ctype<wchar_t>::~ctype()
 460   { _S_destroy_c_locale(_M_c_locale_ctype); }
 461
 462   template<>
 463     ctype_byname<wchar_t>::ctype_byname(const char* __s, size_t __refs)
 464     : ctype<wchar_t>(__refs)
 465     {
 466       _S_destroy_c_locale(_M_c_locale_ctype);
 467       _S_create_c_locale(_M_c_locale_ctype, __s);
 468     }
 469 #endif
 470
 471   // Definitions for static const data members of time_base
 472   template<>
 473     const char*
 474     __timepunct<char>::_S_timezones[14] =
 475     {
 476       "GMT", "HST", "AKST", "PST", "MST", "CST", "EST", "AST", "NST", "CET",
 477       "IST", "EET", "CST", "JST"
 478     };
 479
 480 #ifdef _GLIBCPP_USE_WCHAR_T
 481   template<>
 482     const wchar_t*
 483     __timepunct<wchar_t>::_S_timezones[14] =
 484     {
 485       L"GMT", L"HST", L"AKST", L"PST", L"MST", L"CST", L"EST", L"AST",
 486       L"NST", L"CET", L"IST", L"EET", L"CST", L"JST"
 487     };
 488 #endif
 489
 490   // Definitions for static const data members of money_base
 491   const money_base::pattern
 492   money_base::_S_default_pattern =  { {symbol, sign, none, value} };
 493
 494   template<>
 495     const ctype<char>&
 496     use_facet<ctype<char> >(const locale& __loc)
 497     {
 498       size_t __i = ctype<char>::id._M_index;
 499       const locale::_Impl* __tmp = __loc._M_impl;
 500       return static_cast<const ctype<char>&>(* (*(__tmp->_M_facets))[__i]);
 501     }
 502
 503 #ifdef _GLIBCPP_USE_WCHAR_T
 504   template<>
 505     const ctype<wchar_t>&
 506     use_facet<ctype<wchar_t> >(const locale& __loc)
 507     {
 508       size_t __i = ctype<wchar_t>::id._M_index;
 509       const locale::_Impl* __tmp = __loc._M_impl;
 510       return static_cast<const ctype<wchar_t>&>(* (*(__tmp->_M_facets))[__i]);
 511     }
 512 #endif
 513
 514
 515   const char __num_base::_S_atoms[] = "0123456789eEabcdfABCDF";
 516
 517   const double __num_base::_S_scale_hex = log(10.0)/log(16.0);
 518
 519   const double __num_base::_S_scale_oct = log(10.0)/log(8.0);
 520
 521   bool
 522   __num_base::_S_format_float(const ios_base& __io, char* __fptr, char __mod,
 523                               streamsize __prec)
 524   {
 525     bool __incl_prec = false;
 526     ios_base::fmtflags __flags = __io.flags();
 527     *__fptr++ = '%';
 528     // [22.2.2.2.2] Table 60
 529     if (__flags & ios_base::showpos)
 530       *__fptr++ = '+';
 531     if (__flags & ios_base::showpoint)
 532       *__fptr++ = '#';
 533     // As per [22.2.2.2.2.11]
 534     if (__flags & ios_base::fixed || __prec > 0)
 535       {
 536         *__fptr++ = '.';
 537         *__fptr++ = '*';
 538         __incl_prec = true;
 539       }
 540     if (__mod)
 541       *__fptr++ = __mod;
 542     ios_base::fmtflags __fltfield = __flags & ios_base::floatfield;
 543     // [22.2.2.2.2] Table 58
 544     if (__fltfield == ios_base::fixed)
 545       *__fptr++ = 'f';
 546     else if (__fltfield == ios_base::scientific)
 547       *__fptr++ = (__flags & ios_base::uppercase) ? 'E' : 'e';
 548     else
 549       *__fptr++ = (__flags & ios_base::uppercase) ? 'G' : 'g';
 550     *__fptr = '\0';
 551     return __incl_prec;
 552   }
 553
 554   void
 555   __num_base::_S_format_int(const ios_base& __io, char* __fptr, char __mod,
 556                             char __modl)
 557   {
 558     ios_base::fmtflags __flags = __io.flags();
 559     *__fptr++ = '%';
 560     // [22.2.2.2.2] Table 60
 561     if (__flags & ios_base::showpos)
 562       *__fptr++ = '+';
 563     if (__flags & ios_base::showbase)
 564       *__fptr++ = '#';
 565     *__fptr++ = 'l';
 566
 567     // For long long types.
 568     if (__modl)
 569       *__fptr++ = __modl;
 570
 571     ios_base::fmtflags __bsefield = __flags & ios_base::basefield;
 572     if (__bsefield == ios_base::hex)
 573       *__fptr++ = (__flags & ios_base::uppercase) ? 'X' : 'x';
 574     else if (__bsefield == ios_base::oct)
 575       *__fptr++ = 'o';
 576     else
 577       *__fptr++ = __mod;
 578     *__fptr = '\0';
 579   }
 580
 581   template<>
 582     moneypunct_byname<char, false>::moneypunct_byname(const char*,
 583                                                       size_t __refs)
 584     : moneypunct<char, false>(__refs) { }
 585
 586   template<>
 587     moneypunct_byname<char, true>::moneypunct_byname(const char*,
 588                                                      size_t __refs)
 589     : moneypunct<char, true>(__refs) { }
 590 } // namespace std