# locale.cc

    00001 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
    00002 // Free Software Foundation, Inc.
    00003 //
    00004 // This file is part of the GNU ISO C++ Library.  This library is free
    00005 // software; you can redistribute it and/or modify it under the
    00006 // terms of the GNU General Public License as published by the
    00007 // Free Software Foundation; either version 2, or (at your option)
    00008 // any later version.
    00009
    00010 // This library is distributed in the hope that it will be useful,
    00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013 // GNU General Public License for more details.
    00014
    00015 // You should have received a copy of the GNU General Public License along
    00016 // with this library; see the file COPYING.  If not, write to the Free
    00017 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
    00018 // USA.
    00019
    00020 // As a special exception, you may use this file as part of a free software
    00021 // library without restriction.  Specifically, if other files instantiate
    00022 // templates or use macros or inline functions from this file, or you compile
    00023 // this file and link it with other files to produce an executable, this
    00024 // file does not by itself cause the resulting executable to be covered by
    00025 // the GNU General Public License.  This exception does not however
    00026 // invalidate any other reasons why the executable file might be covered by
    00027 // the GNU General Public License.
    00028
    00029 #include <clocale>
    00030 #include <cstring>
    00031 #include <cctype>
    00032 #include <cwctype>     // For towupper, etc.
    00033 #include <locale>
    00034 #include <bits/atomicity.h>
    00035
    00036 namespace __gnu_cxx
    00037 {
    00038   // Defined in globals.cc.
    00039   extern std::locale        c_locale;
    00040   extern std::locale::_Impl     c_locale_impl;
    00041 } // namespace __gnu_cxx
    00042
    00043 namespace std
    00044 {
    00045   using namespace __gnu_cxx;
    00046
    00047   // Definitions for static const data members of locale.
    00048   const locale::category    locale::none;
    00049   const locale::category    locale::ctype;
    00050   const locale::category    locale::numeric;
    00051   const locale::category    locale::collate;
    00052   const locale::category    locale::time;
    00053   const locale::category    locale::monetary;
    00054   const locale::category    locale::messages;
    00055   const locale::category    locale::all;
    00056
    00057   // In the future, GLIBCXX_ABI > 5 should remove all uses of
    00058   // _GLIBCPP_ASM_SYMVER in this file, and remove exports of any
    00059   // static data members of locale.
    00060   locale::_Impl*        locale::_S_classic;
    00061   locale::_Impl*        locale::_S_global;
    00062   const size_t          locale::_S_categories_size;
    00063   _GLIBCPP_ASM_SYMVER(_ZNSt6locale18_S_categories_sizeE, _ZNSt6locale17_S_num_categoriesE, GLIBCPP_3.2)
    00064   const size_t          locale::_S_extra_categories_size;
    00065
    00066   // Definitions for static const data members of locale::id
    00067   _Atomic_word locale::id::_S_highwater;  // init'd to 0 by linker
    00068
    00069   // Definitions for static const data members of locale::_Impl
    00070   const locale::id* const
    00071   locale::_Impl::_S_id_ctype[] =
    00072   {
    00073     &std::ctype<char>::id,
    00074     &codecvt<char, char, mbstate_t>::id,
    00075 #ifdef _GLIBCPP_USE_WCHAR_T
    00076     &std::ctype<wchar_t>::id,
    00077     &codecvt<wchar_t, char, mbstate_t>::id,
    00078 #endif
    00079     0
    00080   };
    00081
    00082   const locale::id* const
    00083   locale::_Impl::_S_id_numeric[] =
    00084   {
    00085     &num_get<char>::id,
    00086     &num_put<char>::id,
    00087     &numpunct<char>::id,
    00088 #ifdef _GLIBCPP_USE_WCHAR_T
    00089     &num_get<wchar_t>::id,
    00090     &num_put<wchar_t>::id,
    00091     &numpunct<wchar_t>::id,
    00092 #endif
    00093     0
    00094   };
    00095
    00096   const locale::id* const
    00097   locale::_Impl::_S_id_collate[] =
    00098   {
    00099     &std::collate<char>::id,
    00100 #ifdef _GLIBCPP_USE_WCHAR_T
    00101     &std::collate<wchar_t>::id,
    00102 #endif
    00103     0
    00104   };
    00105
    00106   const locale::id* const
    00107   locale::_Impl::_S_id_time[] =
    00108   {
    00109     &__timepunct<char>::id,
    00110     &time_get<char>::id,
    00111     &time_put<char>::id,
    00112 #ifdef _GLIBCPP_USE_WCHAR_T
    00113     &__timepunct<wchar_t>::id,
    00114     &time_get<wchar_t>::id,
    00115     &time_put<wchar_t>::id,
    00116 #endif
    00117     0
    00118   };
    00119
    00120   const locale::id* const
    00121   locale::_Impl::_S_id_monetary[] =
    00122   {
    00123     &money_get<char>::id,
    00124     &money_put<char>::id,
    00125     &moneypunct<char, false>::id,
    00126     &moneypunct<char, true >::id,
    00127 #ifdef _GLIBCPP_USE_WCHAR_T
    00128     &money_get<wchar_t>::id,
    00129     &money_put<wchar_t>::id,
    00130     &moneypunct<wchar_t, false>::id,
    00131     &moneypunct<wchar_t, true >::id,
    00132 #endif
    00133     0
    00134   };
    00135
    00136   const locale::id* const
    00137   locale::_Impl::_S_id_messages[] =
    00138   {
    00139     &std::messages<char>::id,
    00140 #ifdef _GLIBCPP_USE_WCHAR_T
    00141     &std::messages<wchar_t>::id,
    00142 #endif
    00143     0
    00144   };
    00145
    00146   const locale::id* const* const
    00147   locale::_Impl::_S_facet_categories[] =
    00148   {
    00149     // Order must match the decl order in class locale.
    00150     locale::_Impl::_S_id_ctype,
    00151     locale::_Impl::_S_id_numeric,
    00152     locale::_Impl::_S_id_collate,
    00153     locale::_Impl::_S_id_time,
    00154     locale::_Impl::_S_id_monetary,
    00155     locale::_Impl::_S_id_messages,
    00156     0
    00157   };
    00158
    00159   locale::locale() throw()
    00160   {
    00161     _S_initialize();
    00162     (_M_impl = _S_global)->_M_add_reference();
    00163   }
    00164
    00165   locale::locale(const locale& __other) throw()
    00166   { (_M_impl = __other._M_impl)->_M_add_reference(); }
    00167
    00168   // This is used to initialize global and classic locales, and
    00169   // assumes that the _Impl objects are constructed correctly.
    00170   // The lack of a reference increment is intentional.
    00171   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
    00172   { }
    00173
    00174   locale::locale(const char* __s)
    00175   {
    00176     if (__s)
    00177       {
    00178     _S_initialize();
    00179     if (strcmp(__s, "C") == 0 || strcmp(__s, "POSIX") == 0)
    00180       (_M_impl = _S_classic)->_M_add_reference();
    00181     else if (strcmp(__s, "") != 0)
    00182       _M_impl = new _Impl(__s, 1);
    00183     else
    00184       {
    00185         // Get it from the environment.
    00186         char* __env = getenv("LC_ALL");
    00187         // If LC_ALL is set we are done.
    00188         if (__env && strcmp(__env, "") != 0)
    00189           {
    00190         if (strcmp(__env, "C") == 0 || strcmp(__env, "POSIX") == 0)
    00191           (_M_impl = _S_classic)->_M_add_reference();
    00192         else
    00193           _M_impl = new _Impl(__env, 1);
    00194           }
    00195         else
    00196           {
    00197         char* __res;
    00198         // LANG may set a default different from "C".
    00199         char* __env = getenv("LANG");
    00200         if (!__env || strcmp(__env, "") == 0 || strcmp(__env, "C") == 0
    00201             || strcmp(__env, "POSIX") == 0)
    00202           __res = strdup("C");
    00203         else
    00204           __res = strdup(__env);
    00205
    00206         // Scan the categories looking for the first one
    00207         // different from LANG.
    00208         size_t __i = 0;
    00209         if (strcmp(__res, "C") == 0)
    00210           for (; __i < _S_categories_size
    00211              + _S_extra_categories_size; ++__i)
    00212             {
    00213               __env = getenv(_S_categories[__i]);
    00214               if (__env && strcmp(__env, "") != 0
    00215               && strcmp(__env, "C") != 0
    00216               && strcmp(__env, "POSIX") != 0)
    00217             break;
    00218             }
    00219         else
    00220           for (; __i < _S_categories_size
    00221              + _S_extra_categories_size; ++__i)
    00222             {
    00223               __env = getenv(_S_categories[__i]);
    00224               if (__env && strcmp(__env, "") != 0
    00225               && strcmp(__env, __res) != 0)
    00226             break;
    00227             }
    00228
    00229         // If one is found, build the complete string of
    00230         // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...
    00231         if (__i < _S_categories_size + _S_extra_categories_size)
    00232           {
    00233             string __str;
    00234             for (size_t __j = 0; __j < __i; ++__j)
    00235               {
    00236             __str += _S_categories[__j];
    00237             __str += '=';
    00238             __str += __res;
    00239             __str += ';';
    00240               }
    00241             __str += _S_categories[__i];
    00242             __str += '=';
    00243             __str += __env;
    00244             __str += ';';
    00245             __i++;
    00246             for (; __i < _S_categories_size
    00247                + _S_extra_categories_size; ++__i)
    00248               {
    00249             __env = getenv(_S_categories[__i]);
    00250             if (!__env || strcmp(__env, "") == 0)
    00251               {
    00252                 __str += _S_categories[__i];
    00253                 __str += '=';
    00254                 __str += __res;
    00255                 __str += ';';
    00256               }
    00257             else if (strcmp(__env, "C") == 0
    00258                  || strcmp(__env, "POSIX") == 0)
    00259               {
    00260                 __str += _S_categories[__i];
    00261                 __str += "=C;";
    00262               }
    00263             else
    00264               {
    00265                 __str += _S_categories[__i];
    00266                 __str += '=';
    00267                 __str += __env;
    00268                 __str += ';';
    00269               }
    00270               }
    00271             __str.erase(__str.end() - 1);
    00272             _M_impl = new _Impl(__str.c_str(), 1);
    00273           }
    00274         // ... otherwise either an additional instance of
    00275         // the "C" locale or LANG.
    00276         else if (strcmp(__res, "C") == 0)
    00277           (_M_impl = _S_classic)->_M_add_reference();
    00278         else
    00279           _M_impl = new _Impl(__res, 1);
    00280         free(__res);
    00281           }
    00282       }
    00283       }
    00284     else
    00285       __throw_runtime_error("attempt to create locale from NULL name");
    00286   }
    00287
    00288   locale::locale(const locale& __base, const char* __s, category __cat)
    00289   {
    00290     // NB: There are complicated, yet more efficient ways to do
    00291     // this. Building up locales on a per-category way is tedious, so
    00292     // let's do it this way until people complain.
    00293     locale __add(__s);
    00294     _M_coalesce(__base, __add, __cat);
    00295   }
    00296
    00297   locale::locale(const locale& __base, const locale& __add, category __cat)
    00298   { _M_coalesce(__base, __add, __cat); }
    00299
    00300   locale::~locale() throw()
    00301   { _M_impl->_M_remove_reference(); }
    00302
    00303   bool
    00304   locale::operator==(const locale& __rhs) const throw()
    00305   {
    00306     string __name = this->name();
    00307     return (_M_impl == __rhs._M_impl
    00308         || (__name != "*" && __name == __rhs.name()));
    00309   }
    00310
    00311   const locale&
    00312   locale::operator=(const locale& __other) throw()
    00313   {
    00314     __other._M_impl->_M_add_reference();
    00315     _M_impl->_M_remove_reference();
    00316     _M_impl = __other._M_impl;
    00317     return *this;
    00318   }
    00319
    00320   locale
    00321   locale::global(const locale& __other)
    00322   {
    00323     // XXX MT
    00324     _S_initialize();
    00325     _Impl* __old = _S_global;
    00326     __other._M_impl->_M_add_reference();
    00327     _S_global = __other._M_impl;
    00328     if (_S_global->_M_check_same_name()
    00329     && (strcmp(_S_global->_M_names[0], "*") != 0))
    00330       setlocale(LC_ALL, __other.name().c_str());
    00331
    00332     // Reference count sanity check: one reference removed for the
    00333     // subsition of __other locale, one added by return-by-value. Net
    00334     // difference: zero. When the returned locale object's destrutor
    00335     // is called, then the reference count is decremented and possibly
    00336     // destroyed.
    00337     return locale(__old);
    00338   }
    00339
    00340   string
    00341   locale::name() const
    00342   {
    00343     string __ret;
    00344     if (_M_impl->_M_check_same_name())
    00345       __ret = _M_impl->_M_names[0];
    00346     else
    00347       {
    00348     __ret += _S_categories[0];
    00349     __ret += '=';
    00350     __ret += _M_impl->_M_names[0];
    00351     for (size_t __i = 1;
    00352          __i < _S_categories_size + _S_extra_categories_size;
    00353          ++__i)
    00354       {
    00355         __ret += ';';
    00356         __ret += _S_categories[__i];
    00357         __ret += '=';
    00358         __ret += _M_impl->_M_names[__i];
    00359       }
    00360       }
    00361     return __ret;
    00362   }
    00363
    00364   const locale&
    00365   locale::classic()
    00366   {
    00367     // Locking protocol: singleton-called-before-threading-starts
    00368     if (!_S_classic)
    00369       {
    00370     try
    00371       {
    00372         // 26 Standard facets, 2 references.
    00373         // One reference for _S_classic, one for _S_global
    00374         _S_classic = new (&c_locale_impl) _Impl(0, 2, true);
    00375         _S_global = _S_classic;
    00376         new (&c_locale) locale(_S_classic);
    00377       }
    00378     catch(...)
    00379       {
    00380         // Just call destructor, so that locale_impl_c's memory is
    00381         // not deallocated via a call to delete.
    00382         if (_S_classic)
    00383           _S_classic->~_Impl();
    00384         _S_classic = _S_global = 0;
    00385         __throw_exception_again;
    00386       }
    00387       }
    00388     return c_locale;
    00389   }
    00390
    00391   void
    00392   locale::_M_coalesce(const locale& __base, const locale& __add,
    00393               category __cat)
    00394   {
    00395     __cat = _S_normalize_category(__cat);
    00396     _M_impl = new _Impl(*__base._M_impl, 1);
    00397
    00398     try
    00399       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
    00400     catch (...)
    00401       {
    00402     _M_impl->_M_remove_reference();
    00403     __throw_exception_again;
    00404       }
    00405   }
    00406
    00407   locale::category
    00408   locale::_S_normalize_category(category __cat)
    00409   {
    00410     int __ret = 0;
    00411     if (__cat == none || (__cat & all) && !(__cat & ~all))
    00412       __ret = __cat;
    00413     else
    00414       {
    00415     // NB: May be a C-style "LC_ALL" category; convert.
    00416     switch (__cat)
    00417       {
    00418       case LC_COLLATE:
    00419         __ret = collate;
    00420         break;
    00421       case LC_CTYPE:
    00422         __ret = ctype;
    00423         break;
    00424       case LC_MONETARY:
    00425         __ret = monetary;
    00426         break;
    00427       case LC_NUMERIC:
    00428         __ret = numeric;
    00429         break;
    00430       case LC_TIME:
    00431         __ret = time;
    00432         break;
    00433 #ifdef _GLIBCPP_HAVE_LC_MESSAGES
    00434       case LC_MESSAGES:
    00435         __ret = messages;
    00436         break;
    00437 #endif
    00438       case LC_ALL:
    00439         __ret = all;
    00440         break;
    00441       default:
    00442         __throw_runtime_error("bad locale category");
    00443       }
    00444       }
    00445     return __ret;
    00446   }
    00447
    00448   __c_locale
    00449   locale::facet::_S_c_locale;
    00450
    00451   char locale::facet::_S_c_name[2];
    00452
    00453   locale::facet::
    00454   ~facet() { }
    00455
    00456   locale::facet::
    00457   facet(size_t __refs) throw() : _M_references(__refs ? 1 : 0)
    00458   { }
    00459
    00460   void
    00461   locale::facet::
    00462   _M_add_reference() throw()
    00463   { __atomic_add(&_M_references, 1); }
    00464
    00465   void
    00466   locale::facet::
    00467   _M_remove_reference() throw()
    00468   {
    00469     if (__exchange_and_add(&_M_references, -1) == 1)
    00470       {
    00471         try
    00472       { delete this; }
    00473     catch (...)
    00474       { }
    00475       }
    00476   }
    00477
    00478   locale::id::id()
    00479   { }
    00480
    00481   // Definitions for static const data members of time_base
    00482   template<>
    00483     const char*
    00484     __timepunct<char>::_S_timezones[14] =
    00485     {
    00486       "GMT", "HST", "AKST", "PST", "MST", "CST", "EST", "AST", "NST", "CET",
    00487       "IST", "EET", "CST", "JST"
    00488     };
    00489
    00490 #ifdef _GLIBCPP_USE_WCHAR_T
    00491   template<>
    00492     const wchar_t*
    00493     __timepunct<wchar_t>::_S_timezones[14] =
    00494     {
    00495       L"GMT", L"HST", L"AKST", L"PST", L"MST", L"CST", L"EST", L"AST",
    00496       L"NST", L"CET", L"IST", L"EET", L"CST", L"JST"
    00497     };
    00498 #endif
    00499
    00500   // Definitions for static const data members of money_base
    00501   const money_base::pattern
    00502   money_base::_S_default_pattern =  { {symbol, sign, none, value} };
    00503
    00504   const char* __num_base::_S_atoms_in = "0123456789eEabcdfABCDF";
    00505   const char* __num_base::_S_atoms_out ="-+xX0123456789abcdef0123456789ABCDEF";
    00506
    00507   // _GLIBCPP_RESOLVE_LIB_DEFECTS
    00508   // According to the resolution of DR 231, about 22.2.2.2.2, p11,
    00509   // "str.precision() is specified in the conversion specification".
    00510   void
    00511   __num_base::_S_format_float(const ios_base& __io, char* __fptr,
    00512                   char __mod, streamsize/* unused post DR 231 */)
    00513   {
    00514     ios_base::fmtflags __flags = __io.flags();
    00515     *__fptr++ = '%';
    00516     // [22.2.2.2.2] Table 60
    00517     if (__flags & ios_base::showpos)
    00518       *__fptr++ = '+';
    00519     if (__flags & ios_base::showpoint)
    00520       *__fptr++ = '#';
    00521
    00522     // As per DR 231: _always_, not only when
    00523     // __flags & ios_base::fixed || __prec > 0
    00524     *__fptr++ = '.';
    00525     *__fptr++ = '*';
    00526
    00527     if (__mod)
    00528       *__fptr++ = __mod;
    00529     ios_base::fmtflags __fltfield = __flags & ios_base::floatfield;
    00530     // [22.2.2.2.2] Table 58
    00531     if (__fltfield == ios_base::fixed)
    00532       *__fptr++ = 'f';
    00533     else if (__fltfield == ios_base::scientific)
    00534       *__fptr++ = (__flags & ios_base::uppercase) ? 'E' : 'e';
    00535     else
    00536       *__fptr++ = (__flags & ios_base::uppercase) ? 'G' : 'g';
    00537     *__fptr = '\0';
    00538   }
    00539
    00540   void
    00541   __num_base::_S_format_int(const ios_base& __io, char* __fptr, char __mod,
    00542                 char __modl)
    00543   {
    00544     ios_base::fmtflags __flags = __io.flags();
    00545     *__fptr++ = '%';
    00546     // [22.2.2.2.2] Table 60
    00547     if (__flags & ios_base::showpos)
    00548       *__fptr++ = '+';
    00549     if (__flags & ios_base::showbase)
    00550       *__fptr++ = '#';
    00551     *__fptr++ = 'l';
    00552
    00553     // For long long types.
    00554     if (__modl)
    00555       *__fptr++ = __modl;
    00556
    00557     ios_base::fmtflags __bsefield = __flags & ios_base::basefield;
    00558     if (__bsefield == ios_base::hex)
    00559       *__fptr++ = (__flags & ios_base::uppercase) ? 'X' : 'x';
    00560     else if (__bsefield == ios_base::oct)
    00561       *__fptr++ = 'o';
    00562     else
    00563       *__fptr++ = __mod;
    00564     *__fptr = '\0';
    00565   }
    00566 } // namespace std
    00567