locale.cc

00001 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
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 <cassert>
00032 #include <cctype>
00033 #include <cwctype>     // For towupper, etc.
00034 #include <locale>
00035 #include <bits/atomicity.h>
00036 
00037 namespace __gnu_cxx
00038 {
00039   // Defined in globals.cc.
00040   extern std::locale        c_locale;
00041   extern std::locale::_Impl     c_locale_impl;
00042 } // namespace __gnu_cxx
00043 
00044 namespace std 
00045 {
00046   using namespace __gnu_cxx;
00047 
00048   // Definitions for static const data members of locale.
00049   const locale::category    locale::none;
00050   const locale::category    locale::ctype;
00051   const locale::category    locale::numeric;
00052   const locale::category    locale::collate;
00053   const locale::category    locale::time;
00054   const locale::category    locale::monetary;
00055   const locale::category    locale::messages;
00056   const locale::category    locale::all;
00057 
00058   // In the future, GLIBCXX_ABI > 5 should remove all uses of
00059   // _GLIBCPP_ASM_SYMVER in this file, and remove exports of any
00060   // static data members of locale.
00061   locale::_Impl*        locale::_S_classic;
00062   locale::_Impl*        locale::_S_global; 
00063   const size_t          locale::_S_categories_size;
00064   _GLIBCPP_ASM_SYMVER(_ZNSt6locale18_S_categories_sizeE, _ZNSt6locale17_S_num_categoriesE, GLIBCPP_3.2)
00065   const size_t          locale::_S_extra_categories_size;
00066 
00067   // Definitions for static const data members of locale::id
00068   _Atomic_word locale::id::_S_highwater;  // init'd to 0 by linker
00069 
00070   // Definitions for static const data members of locale::_Impl
00071   const locale::id* const
00072   locale::_Impl::_S_id_ctype[] =
00073   {
00074     &std::ctype<char>::id, 
00075     &codecvt<char, char, mbstate_t>::id,
00076 #ifdef _GLIBCPP_USE_WCHAR_T
00077     &std::ctype<wchar_t>::id,
00078     &codecvt<wchar_t, char, mbstate_t>::id,
00079 #endif
00080     0
00081   };
00082 
00083   const locale::id* const
00084   locale::_Impl::_S_id_numeric[] =
00085   {
00086     &num_get<char>::id,  
00087     &num_put<char>::id,  
00088     &numpunct<char>::id, 
00089 #ifdef _GLIBCPP_USE_WCHAR_T
00090     &num_get<wchar_t>::id,
00091     &num_put<wchar_t>::id,
00092     &numpunct<wchar_t>::id,
00093 #endif
00094     0
00095   };
00096   
00097   const locale::id* const
00098   locale::_Impl::_S_id_collate[] =
00099   {
00100     &std::collate<char>::id,
00101 #ifdef _GLIBCPP_USE_WCHAR_T
00102     &std::collate<wchar_t>::id,
00103 #endif
00104     0
00105   };
00106 
00107   const locale::id* const
00108   locale::_Impl::_S_id_time[] =
00109   {
00110     &__timepunct<char>::id, 
00111     &time_get<char>::id, 
00112     &time_put<char>::id, 
00113 #ifdef _GLIBCPP_USE_WCHAR_T
00114     &__timepunct<wchar_t>::id, 
00115     &time_get<wchar_t>::id,
00116     &time_put<wchar_t>::id,
00117 #endif
00118     0
00119   };
00120   
00121   const locale::id* const
00122   locale::_Impl::_S_id_monetary[] =
00123   {
00124     &money_get<char>::id,        
00125     &money_put<char>::id,        
00126     &moneypunct<char, false>::id, 
00127     &moneypunct<char, true >::id, 
00128 #ifdef _GLIBCPP_USE_WCHAR_T
00129     &money_get<wchar_t>::id,
00130     &money_put<wchar_t>::id,
00131     &moneypunct<wchar_t, false>::id,
00132     &moneypunct<wchar_t, true >::id,
00133 #endif
00134     0
00135   };
00136 
00137   const locale::id* const
00138   locale::_Impl::_S_id_messages[] =
00139   {
00140     &std::messages<char>::id, 
00141 #ifdef _GLIBCPP_USE_WCHAR_T
00142     &std::messages<wchar_t>::id,
00143 #endif
00144     0
00145   };
00146   
00147   const locale::id* const* const
00148   locale::_Impl::_S_facet_categories[] =
00149   {
00150     // Order must match the decl order in class locale.
00151     locale::_Impl::_S_id_ctype,
00152     locale::_Impl::_S_id_numeric,
00153     locale::_Impl::_S_id_collate,
00154     locale::_Impl::_S_id_time,
00155     locale::_Impl::_S_id_monetary,
00156     locale::_Impl::_S_id_messages,
00157     0
00158   };
00159 
00160   locale::locale() throw()
00161   { 
00162     _S_initialize(); 
00163     (_M_impl = _S_global)->_M_add_reference(); 
00164   }
00165 
00166   locale::locale(const locale& __other) throw()
00167   { (_M_impl = __other._M_impl)->_M_add_reference(); }
00168 
00169   // This is used to initialize global and classic locales, and
00170   // assumes that the _Impl objects are constructed correctly.
00171   // The lack of a reference increment is intentional.
00172   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
00173   { }
00174 
00175   locale::locale(const char* __s)
00176   {
00177     if (__s)
00178       {
00179     _S_initialize(); 
00180     if (strcmp(__s, "C") == 0 || strcmp(__s, "POSIX") == 0)
00181       (_M_impl = _S_classic)->_M_add_reference();
00182     else if (strcmp(__s, "") != 0)
00183       _M_impl = new _Impl(__s, 1);
00184     else
00185       {
00186         // Get it from the environment.
00187         char* __env = getenv("LC_ALL");
00188         // If LC_ALL is set we are done.
00189         if (__env && strcmp(__env, "") != 0)
00190           {
00191         if (strcmp(__env, "C") == 0 || strcmp(__env, "POSIX") == 0)
00192           (_M_impl = _S_classic)->_M_add_reference();
00193         else
00194           _M_impl = new _Impl(__env, 1);
00195           }
00196         else
00197           {
00198         char* __res;
00199         // LANG may set a default different from "C".
00200         char* __env = getenv("LANG");
00201         if (!__env || strcmp(__env, "") == 0 || strcmp(__env, "C") == 0
00202             || strcmp(__env, "POSIX") == 0)
00203           __res = strdup("C");
00204         else 
00205           __res = strdup(__env);
00206         
00207         // Scan the categories looking for the first one
00208         // different from LANG.
00209         size_t __i = 0;
00210         if (strcmp(__res, "C") == 0)
00211           for (__i = 0; 
00212                __i < _S_categories_size + _S_extra_categories_size; 
00213                ++__i)
00214             {
00215               __env = getenv(_S_categories[__i]);
00216               if (__env && strcmp(__env, "") != 0 
00217               && strcmp(__env, "C") != 0 
00218               && strcmp(__env, "POSIX") != 0) 
00219             break;
00220             }
00221         else
00222           for (__i = 0; 
00223                __i < _S_categories_size + _S_extra_categories_size; 
00224                ++__i)
00225             {
00226               __env = getenv(_S_categories[__i]);
00227               if (__env && strcmp(__env, "") != 0 
00228               && strcmp(__env, __res) != 0) 
00229             break;
00230             }
00231     
00232         // If one is found, build the complete string of
00233         // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...
00234         if (__i < _S_categories_size + _S_extra_categories_size)
00235           {
00236             string __str;
00237             for (size_t __j = 0; __j < __i; ++__j)
00238               {
00239             __str += _S_categories[__j];
00240             __str += "=";
00241             __str += __res;
00242             __str += ";";
00243               }
00244             __str += _S_categories[__i];
00245             __str += "=";
00246             __str += __env;
00247             __str += ";";
00248             __i++;
00249             for (; __i < _S_categories_size
00250                + _S_extra_categories_size; ++__i)
00251               {
00252             __env = getenv(_S_categories[__i]);
00253             if (!__env || strcmp(__env, "") == 0)
00254               {
00255                 __str += _S_categories[__i];
00256                 __str += '=';
00257                 __str += __res;
00258                 __str += ';';
00259               }
00260             else if (strcmp(__env, "C") == 0
00261                  || strcmp(__env, "POSIX") == 0)
00262               {
00263                 __str += _S_categories[__i];
00264                 __str += "=C;";
00265               }
00266             else
00267               {
00268                 __str += _S_categories[__i];
00269                 __str += "=";
00270                 __str += __env;
00271                 __str += ";";
00272               }
00273               }
00274             __str.erase(__str.end() - 1);
00275             _M_impl = new _Impl(__str.c_str(), 1);
00276           }
00277         // ... otherwise either an additional instance of
00278         // the "C" locale or LANG.
00279         else if (strcmp(__res, "C") == 0)
00280           (_M_impl = _S_classic)->_M_add_reference();
00281         else
00282           _M_impl = new _Impl(__res, 1);
00283         free(__res);
00284           }
00285       }
00286       }
00287     else
00288       __throw_runtime_error("attempt to create locale from NULL name");
00289   }
00290 
00291   locale::locale(const locale& __base, const char* __s, category __cat)
00292   { 
00293     // NB: There are complicated, yet more efficient ways to do
00294     // this. Building up locales on a per-category way is tedious, so
00295     // let's do it this way until people complain.
00296     locale __add(__s);
00297     _M_coalesce(__base, __add, __cat);
00298   }
00299 
00300   locale::locale(const locale& __base, const locale& __add, category __cat)
00301   { _M_coalesce(__base, __add, __cat); }
00302 
00303   locale::~locale() throw()
00304   { _M_impl->_M_remove_reference(); }
00305 
00306   bool
00307   locale::operator==(const locale& __rhs) const throw()
00308   {
00309     string __name = this->name();
00310     return (_M_impl == __rhs._M_impl 
00311         || (__name != "*" && __name == __rhs.name()));
00312   }
00313 
00314   const locale&
00315   locale::operator=(const locale& __other) throw()
00316   {
00317     __other._M_impl->_M_add_reference();
00318     _M_impl->_M_remove_reference();
00319     _M_impl = __other._M_impl;
00320     return *this;
00321   }
00322 
00323   locale
00324   locale::global(const locale& __other)
00325   {
00326     // XXX MT
00327     _S_initialize();
00328     _Impl* __old = _S_global;
00329     __other._M_impl->_M_add_reference();
00330     _S_global = __other._M_impl; 
00331     if (_S_global->_M_check_same_name() 
00332     && (strcmp(_S_global->_M_names[0], "*") != 0))
00333       setlocale(LC_ALL, __other.name().c_str());
00334 
00335     // Reference count sanity check: one reference removed for the
00336     // subsition of __other locale, one added by return-by-value. Net
00337     // difference: zero. When the returned locale object's destrutor
00338     // is called, then the reference count is decremented and possibly
00339     // destroyed.
00340     return locale(__old);
00341   }
00342 
00343   string
00344   locale::name() const
00345   {
00346     string __ret;
00347     if (_M_impl->_M_check_same_name())
00348       __ret = _M_impl->_M_names[0];
00349     else
00350       {
00351     __ret += _S_categories[0];
00352     __ret += "=";
00353     __ret += _M_impl->_M_names[0]; 
00354     for (size_t __i = 1; 
00355          __i < _S_categories_size + _S_extra_categories_size; 
00356          ++__i)
00357       {
00358         __ret += ";";
00359         __ret += _S_categories[__i];
00360         __ret += "=";
00361         __ret += _M_impl->_M_names[__i];
00362       }
00363       }
00364     return __ret;
00365   }
00366 
00367   const locale&
00368   locale::classic()
00369   {
00370     // Locking protocol: singleton-called-before-threading-starts
00371     if (!_S_classic)
00372       {
00373     try 
00374       {
00375         // 26 Standard facets, 2 references.
00376         // One reference for _S_classic, one for _S_global
00377         _S_classic = new (&c_locale_impl) _Impl(0, 2, true);
00378         _S_global = _S_classic;         
00379         new (&c_locale) locale(_S_classic);
00380       }
00381     catch(...) 
00382       {
00383         // Just call destructor, so that locale_impl_c's memory is
00384         // not deallocated via a call to delete.
00385         if (_S_classic)
00386           _S_classic->~_Impl();
00387         _S_classic = _S_global = 0;
00388         __throw_exception_again;
00389       }
00390       }
00391     return c_locale;
00392   }
00393 
00394   void
00395   locale::_M_coalesce(const locale& __base, const locale& __add, 
00396               category __cat)
00397   {
00398     __cat = _S_normalize_category(__cat);  
00399     _M_impl = new _Impl(*__base._M_impl, 1);  
00400 
00401     try 
00402       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
00403     catch (...) 
00404       { 
00405     _M_impl->_M_remove_reference(); 
00406     __throw_exception_again;
00407       }
00408   }
00409 
00410   locale::category
00411   locale::_S_normalize_category(category __cat) 
00412   {
00413     int __ret = 0;
00414     if (__cat == none || (__cat & all) && !(__cat & ~all))
00415       __ret = __cat;
00416     else
00417       {
00418     // NB: May be a C-style "LC_ALL" category; convert.
00419     switch (__cat)
00420       {
00421       case LC_COLLATE:  
00422         __ret = collate; 
00423         break;
00424       case LC_CTYPE:    
00425         __ret = ctype;
00426         break;
00427       case LC_MONETARY: 
00428         __ret = monetary;
00429         break;
00430       case LC_NUMERIC:  
00431         __ret = numeric;
00432         break;
00433       case LC_TIME:     
00434         __ret = time; 
00435         break;
00436 #ifdef _GLIBCPP_HAVE_LC_MESSAGES
00437       case LC_MESSAGES: 
00438         __ret = messages;
00439         break;
00440 #endif  
00441       case LC_ALL:      
00442         __ret = all;
00443         break;
00444       default:
00445         __throw_runtime_error("bad locale category");
00446       }
00447       }
00448     return __ret;
00449   }
00450 
00451   __c_locale
00452   locale::facet::_S_c_locale;
00453   
00454   locale::facet::
00455   ~facet() { }
00456 
00457   locale::facet::
00458   facet(size_t __refs) throw() : _M_references(__refs ? 1 : 0) 
00459   { }
00460 
00461   void  
00462   locale::facet::
00463   _M_add_reference() throw()
00464   { __atomic_add(&_M_references, 1); }
00465 
00466   void  
00467   locale::facet::
00468   _M_remove_reference() throw()
00469   {
00470     if (__exchange_and_add(&_M_references, -1) == 1)
00471       {
00472         try 
00473       { delete this; }  
00474     catch (...) 
00475       { }
00476       }
00477   }
00478   
00479   locale::id::id() 
00480   { }
00481 
00482   // Definitions for static const data members of time_base
00483   template<> 
00484     const char*
00485     __timepunct<char>::_S_timezones[14] =
00486     { 
00487       "GMT", "HST", "AKST", "PST", "MST", "CST", "EST", "AST", "NST", "CET", 
00488       "IST", "EET", "CST", "JST"  
00489     };
00490  
00491 #ifdef _GLIBCPP_USE_WCHAR_T
00492   template<> 
00493     const wchar_t*
00494     __timepunct<wchar_t>::_S_timezones[14] =
00495     { 
00496       L"GMT", L"HST", L"AKST", L"PST", L"MST", L"CST", L"EST", L"AST", 
00497       L"NST", L"CET", L"IST", L"EET", L"CST", L"JST"  
00498     };
00499 #endif
00500 
00501   // Definitions for static const data members of money_base
00502   const money_base::pattern 
00503   money_base::_S_default_pattern =  { {symbol, sign, none, value} };
00504 
00505   const char __num_base::_S_atoms[] = "0123456789eEabcdfABCDF";
00506 
00507   bool
00508   __num_base::_S_format_float(const ios_base& __io, char* __fptr, char __mod,
00509                   streamsize __prec)
00510   {
00511     bool __incl_prec = false;
00512     ios_base::fmtflags __flags = __io.flags();
00513     *__fptr++ = '%';
00514     // [22.2.2.2.2] Table 60
00515     if (__flags & ios_base::showpos)
00516       *__fptr++ = '+';
00517     if (__flags & ios_base::showpoint)
00518       *__fptr++ = '#';
00519     // As per [22.2.2.2.2.11]
00520     if (__flags & ios_base::fixed || __prec > 0)
00521       {
00522     *__fptr++ = '.';
00523     *__fptr++ = '*';
00524     __incl_prec = true;
00525       }
00526     if (__mod)
00527       *__fptr++ = __mod;
00528     ios_base::fmtflags __fltfield = __flags & ios_base::floatfield;
00529     // [22.2.2.2.2] Table 58
00530     if (__fltfield == ios_base::fixed)
00531       *__fptr++ = 'f';
00532     else if (__fltfield == ios_base::scientific)
00533       *__fptr++ = (__flags & ios_base::uppercase) ? 'E' : 'e';
00534     else
00535       *__fptr++ = (__flags & ios_base::uppercase) ? 'G' : 'g';
00536     *__fptr = '\0';
00537     return __incl_prec;
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 

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