# 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 <limits>
    00035 #include <exception>
    00036 #include <locale>
    00037 #include <istream>
    00038 #include <ostream>
    00039 #include <bits/atomicity.h>
    00040
    00041 namespace std
    00042 {
    00043   // Defined in globals.cc.
    00044   extern locale         c_locale;
    00045   extern locale::_Impl      c_locale_impl;
    00046   extern locale::facet**    facet_vec;
    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   locale::_Impl*        locale::_S_classic;
    00059   locale::_Impl*        locale::_S_global;
    00060   const size_t          locale::_S_num_categories;
    00061
    00062   // Definitions for locale::id of standard facets that are specialized.
    00063   locale::id ctype<char>::id;
    00064   locale::id codecvt<char, char, mbstate_t>::id;
    00065
    00066 #ifdef _GLIBCPP_USE_WCHAR_T
    00067   locale::id ctype<wchar_t>::id;
    00068   locale::id codecvt<wchar_t, char, mbstate_t>::id;
    00069 #endif
    00070
    00071   // Definitions for static const data members of locale::id
    00072   _Atomic_word locale::id::_S_highwater;  // init'd to 0 by linker
    00073
    00074   // Definitions for static const data members of locale::_Impl
    00075   const locale::id* const
    00076   locale::_Impl::_S_id_ctype[] =
    00077   {
    00078     &std::ctype<char>::id,
    00079     &codecvt<char, char, mbstate_t>::id,
    00080 #ifdef _GLIBCPP_USE_WCHAR_T
    00081     &std::ctype<wchar_t>::id,
    00082     &codecvt<wchar_t, char, mbstate_t>::id,
    00083 #endif
    00084     0
    00085   };
    00086
    00087   const locale::id* const
    00088   locale::_Impl::_S_id_numeric[] =
    00089   {
    00090     &num_get<char>::id,
    00091     &num_put<char>::id,
    00092     &numpunct<char>::id,
    00093 #ifdef _GLIBCPP_USE_WCHAR_T
    00094     &num_get<wchar_t>::id,
    00095     &num_put<wchar_t>::id,
    00096     &numpunct<wchar_t>::id,
    00097 #endif
    00098     0
    00099   };
    00100
    00101   const locale::id* const
    00102   locale::_Impl::_S_id_collate[] =
    00103   {
    00104     &std::collate<char>::id,
    00105 #ifdef _GLIBCPP_USE_WCHAR_T
    00106     &std::collate<wchar_t>::id,
    00107 #endif
    00108     0
    00109   };
    00110
    00111   const locale::id* const
    00112   locale::_Impl::_S_id_time[] =
    00113   {
    00114     &__timepunct<char>::id,
    00115     &time_get<char>::id,
    00116     &time_put<char>::id,
    00117 #ifdef _GLIBCPP_USE_WCHAR_T
    00118     &__timepunct<wchar_t>::id,
    00119     &time_get<wchar_t>::id,
    00120     &time_put<wchar_t>::id,
    00121 #endif
    00122     0
    00123   };
    00124
    00125   const locale::id* const
    00126   locale::_Impl::_S_id_monetary[] =
    00127   {
    00128     &money_get<char>::id,
    00129     &money_put<char>::id,
    00130     &moneypunct<char, false>::id,
    00131     &moneypunct<char, true >::id,
    00132 #ifdef _GLIBCPP_USE_WCHAR_T
    00133     &money_get<wchar_t>::id,
    00134     &money_put<wchar_t>::id,
    00135     &moneypunct<wchar_t, false>::id,
    00136     &moneypunct<wchar_t, true >::id,
    00137 #endif
    00138     0
    00139   };
    00140
    00141   const locale::id* const
    00142   locale::_Impl::_S_id_messages[] =
    00143   {
    00144     &std::messages<char>::id,
    00145 #ifdef _GLIBCPP_USE_WCHAR_T
    00146     &std::messages<wchar_t>::id,
    00147 #endif
    00148     0
    00149   };
    00150
    00151   const locale::id* const* const
    00152   locale::_Impl::_S_facet_categories[] =
    00153   {
    00154     // Order must match the decl order in class locale.
    00155     locale::_Impl::_S_id_ctype,
    00156     locale::_Impl::_S_id_numeric,
    00157     locale::_Impl::_S_id_collate,
    00158     locale::_Impl::_S_id_monetary,
    00159     locale::_Impl::_S_id_time,
    00160     locale::_Impl::_S_id_messages,
    00161     0
    00162   };
    00163
    00164   locale::~locale() throw()
    00165   { _M_impl->_M_remove_reference(); }
    00166
    00167   void
    00168   locale::_M_coalesce(const locale& __base, const locale& __add,
    00169               category __cat)
    00170   {
    00171     __cat = _S_normalize_category(__cat);
    00172     _M_impl = new _Impl(*__base._M_impl, 1);
    00173
    00174     try
    00175       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
    00176     catch (...)
    00177       {
    00178     _M_impl->_M_remove_reference();
    00179     __throw_exception_again;
    00180       }
    00181   }
    00182
    00183   locale::locale() throw()
    00184   {
    00185     _S_initialize();
    00186     (_M_impl = _S_global)->_M_add_reference();
    00187   }
    00188
    00189   locale::locale(const locale& __other) throw()
    00190   { (_M_impl = __other._M_impl)->_M_add_reference(); }
    00191
    00192   // This is used to initialize global and classic locales, and
    00193   // assumes that the _Impl objects are constructed correctly.
    00194   locale::locale(_Impl* __ip) throw() : _M_impl(__ip)
    00195   { }
    00196
    00197   locale::locale(const char* __s)
    00198   {
    00199     if (__s)
    00200       {
    00201     _S_initialize();
    00202     if (strcmp(__s, "C") == 0 || strcmp(__s, "POSIX") == 0)
    00203       (_M_impl = _S_classic)->_M_add_reference();
    00204     else if (strcmp(__s, "") == 0)
    00205       _M_impl = new _Impl(setlocale(LC_ALL, __s), 1);
    00206     else
    00207       _M_impl = new _Impl(__s, 1);
    00208       }
    00209     else
    00210       __throw_runtime_error("attempt to create locale from NULL name");
    00211   }
    00212
    00213   locale::locale(const locale& __base, const char* __s, category __cat)
    00214   {
    00215     // NB: There are complicated, yet more efficient ways to do
    00216     // this. Building up locales on a per-category way is tedious, so
    00217     // let's do it this way until people complain.
    00218     locale __add(__s);
    00219     _M_coalesce(__base, __add, __cat);
    00220   }
    00221
    00222   locale::locale(const locale& __base, const locale& __add, category __cat)
    00223   { _M_coalesce(__base, __add, __cat); }
    00224
    00225   bool
    00226   locale::operator==(const locale& __rhs) const throw()
    00227   {
    00228     string __name = this->name();
    00229     return (_M_impl == __rhs._M_impl
    00230         || (__name != "*" && __name == __rhs.name()));
    00231   }
    00232
    00233   const locale&
    00234   locale::operator=(const locale& __other) throw()
    00235   {
    00236     __other._M_impl->_M_add_reference();
    00237     _M_impl->_M_remove_reference();
    00238     _M_impl = __other._M_impl;
    00239     return *this;
    00240   }
    00241
    00242   locale
    00243   locale::global(const locale& __other)
    00244   {
    00245     // XXX MT
    00246     _S_initialize();
    00247     _Impl* __old = _S_global;
    00248     __other._M_impl->_M_add_reference();
    00249     _S_global = __other._M_impl;
    00250     if (_S_global->_M_check_same_name()
    00251     && (strcmp(_S_global->_M_names[0], "*") != 0))
    00252       setlocale(LC_ALL, __other.name().c_str());
    00253
    00254     // Reference count sanity check: one reference removed for the
    00255     // subsition of __other locale, one added by return-by-value. Net
    00256     // difference: zero. When the returned locale object's destrutor
    00257     // is called, then the reference count is decremented and possibly
    00258     // destroyed.
    00259     return locale(__old);
    00260   }
    00261
    00262   string
    00263   locale::name() const
    00264   {
    00265     // Need some kind of separator character. This one was pretty much
    00266     // arbitrarily chosen as to not conflict with glibc locales: the
    00267     // exact formatting is not set in stone.
    00268     const char __separator = '|';
    00269
    00270     string __ret;
    00271     if (_M_impl->_M_check_same_name())
    00272       __ret = _M_impl->_M_names[0];
    00273     else
    00274       {
    00275     for (size_t i = 0; i < _S_num_categories; ++i)
    00276       {
    00277         __ret += __separator;
    00278         __ret += _M_impl->_M_names[i];
    00279       }
    00280       }
    00281     return __ret;
    00282   }
    00283
    00284   const locale&
    00285   locale::classic()
    00286   {
    00287     static _STL_mutex_lock __lock __STL_MUTEX_INITIALIZER;
    00288     _STL_auto_lock __auto(__lock);
    00289
    00290     if (!_S_classic)
    00291       {
    00292     try
    00293       {
    00294         // 26 Standard facets, 2 references.
    00295         // One reference for _M_classic, one for _M_global
    00296         facet** f = new(&facet_vec) facet*[_GLIBCPP_NUM_FACETS];
    00297         for (size_t __i = 0; __i < _GLIBCPP_NUM_FACETS; ++__i)
    00298           f[__i] = 0;
    00299
    00300         _S_classic = new (&c_locale_impl) _Impl(f, 2, true);
    00301         _S_global = _S_classic;
    00302         new (&c_locale) locale(_S_classic);
    00303       }
    00304     catch(...)
    00305       {
    00306         // Just call destructor, so that locale_impl_c's memory is
    00307         // not deallocated via a call to delete.
    00308         if (_S_classic)
    00309           _S_classic->~_Impl();
    00310         _S_classic = _S_global = 0;
    00311         __throw_exception_again;
    00312       }
    00313       }
    00314     return c_locale;
    00315   }
    00316
    00317   locale::category
    00318   locale::_S_normalize_category(category __cat)
    00319   {
    00320     int __ret = 0;
    00321     if (__cat == none || (__cat & all) && !(__cat & ~all))
    00322       __ret = __cat;
    00323     else
    00324       {
    00325     // NB: May be a C-style "LC_ALL" category; convert.
    00326     switch (__cat)
    00327       {
    00328       case LC_COLLATE:
    00329         __ret = collate;
    00330         break;
    00331       case LC_CTYPE:
    00332         __ret = ctype;
    00333         break;
    00334       case LC_MONETARY:
    00335         __ret = monetary;
    00336         break;
    00337       case LC_NUMERIC:
    00338         __ret = numeric;
    00339         break;
    00340       case LC_TIME:
    00341         __ret = time;
    00342         break;
    00343 #ifdef _GLIBCPP_HAVE_LC_MESSAGES
    00344       case LC_MESSAGES:
    00345         __ret = messages;
    00346         break;
    00347 #endif
    00348       case LC_ALL:
    00349         __ret = all;
    00350         break;
    00351       default:
    00352         __throw_runtime_error("bad locale category");
    00353       }
    00354       }
    00355     return __ret;
    00356   }
    00357
    00358   __c_locale
    00359   locale::facet::_S_c_locale;
    00360
    00361   locale::facet::
    00362   ~facet() { }
    00363
    00364   locale::facet::
    00365   facet(size_t __refs) throw() : _M_references(__refs)
    00366   {
    00367     if (!_S_c_locale)
    00368       _S_create_c_locale(_S_c_locale, "C");
    00369   }
    00370
    00371   void
    00372   locale::facet::
    00373   _M_add_reference() throw()
    00374   { __atomic_add(&_M_references, 1); }
    00375
    00376   void
    00377   locale::facet::
    00378   _M_remove_reference() throw()
    00379   {
    00380     if (__exchange_and_add(&_M_references, -1) == 0)
    00381       {
    00382         try
    00383       { delete this; }
    00384     catch (...)
    00385       { }
    00386       }
    00387   }
    00388
    00389   locale::id::id()
    00390   { }
    00391
    00392   // Definitions for static const data members of ctype_base.
    00393   const ctype_base::mask ctype_base::space;
    00394   const ctype_base::mask ctype_base::print;
    00395   const ctype_base::mask ctype_base::cntrl;
    00396   const ctype_base::mask ctype_base::upper;
    00397   const ctype_base::mask ctype_base::lower;
    00398   const ctype_base::mask ctype_base::alpha;
    00399   const ctype_base::mask ctype_base::digit;
    00400   const ctype_base::mask ctype_base::punct;
    00401   const ctype_base::mask ctype_base::xdigit;
    00402   const ctype_base::mask ctype_base::alnum;
    00403   const ctype_base::mask ctype_base::graph;
    00404
    00405   // Platform-specific initialization code for ctype tables.
    00406   #include <bits/ctype_noninline.h>
    00407
    00408   const size_t ctype<char>::table_size;
    00409
    00410   ctype<char>::~ctype()
    00411   {
    00412     if (_M_c_locale_ctype != _S_c_locale)
    00413       _S_destroy_c_locale(_M_c_locale_ctype);
    00414     if (_M_del)
    00415       delete[] this->table();
    00416   }
    00417
    00418   // These are dummy placeholders as these virtual functions are never called.
    00419   bool
    00420   ctype<char>::do_is(mask, char_type) const
    00421   { return false; }
    00422
    00423   const char*
    00424   ctype<char>::do_is(const char_type* __c, const char_type*, mask*) const
    00425   { return __c; }
    00426
    00427   const char*
    00428   ctype<char>::do_scan_is(mask, const char_type* __c, const char_type*) const
    00429   { return __c; }
    00430
    00431   const char*
    00432   ctype<char>::do_scan_not(mask, const char_type* __c, const char_type*) const
    00433   { return __c; }
    00434
    00435   char
    00436   ctype<char>::do_widen(char __c) const
    00437   { return __c; }
    00438
    00439   const char*
    00440   ctype<char>::do_widen(const char* __lo, const char* __hi, char* __dest) const
    00441   {
    00442     memcpy(__dest, __lo, __hi - __lo);
    00443     return __hi;
    00444   }
    00445
    00446   char
    00447   ctype<char>::do_narrow(char __c, char /*__dfault*/) const
    00448   { return __c; }
    00449
    00450   const char*
    00451   ctype<char>::do_narrow(const char* __lo, const char* __hi,
    00452              char /*__dfault*/, char* __dest) const
    00453   {
    00454     memcpy(__dest, __lo, __hi - __lo);
    00455     return __hi;
    00456   }
    00457
    00458 #ifdef _GLIBCPP_USE_WCHAR_T
    00459   ctype<wchar_t>::ctype(size_t __refs)
    00460   : __ctype_abstract_base<wchar_t>(__refs)
    00461   { _M_c_locale_ctype = _S_c_locale; }
    00462
    00463   ctype<wchar_t>::ctype(__c_locale __cloc, size_t __refs)
    00464   : __ctype_abstract_base<wchar_t>(__refs)
    00465   { _M_c_locale_ctype = _S_clone_c_locale(__cloc); }
    00466
    00467   ctype<wchar_t>::~ctype()
    00468   {
    00469     if (_M_c_locale_ctype != _S_c_locale)
    00470       _S_destroy_c_locale(_M_c_locale_ctype);
    00471   }
    00472
    00473   template<>
    00474     ctype_byname<wchar_t>::ctype_byname(const char* __s, size_t __refs)
    00475     : ctype<wchar_t>(__refs)
    00476     {
    00477       if (_M_c_locale_ctype != _S_c_locale)
    00478     _S_destroy_c_locale(_M_c_locale_ctype);
    00479       _S_create_c_locale(_M_c_locale_ctype, __s);
    00480     }
    00481 #endif
    00482
    00483   // Definitions for static const data members of time_base
    00484   template<>
    00485     const char*
    00486     __timepunct<char>::_S_timezones[14] =
    00487     {
    00488       "GMT", "HST", "AKST", "PST", "MST", "CST", "EST", "AST", "NST", "CET",
    00489       "IST", "EET", "CST", "JST"
    00490     };
    00491
    00492 #ifdef _GLIBCPP_USE_WCHAR_T
    00493   template<>
    00494     const wchar_t*
    00495     __timepunct<wchar_t>::_S_timezones[14] =
    00496     {
    00497       L"GMT", L"HST", L"AKST", L"PST", L"MST", L"CST", L"EST", L"AST",
    00498       L"NST", L"CET", L"IST", L"EET", L"CST", L"JST"
    00499     };
    00500 #endif
    00501
    00502   // Definitions for static const data members of money_base
    00503   const money_base::pattern
    00504   money_base::_S_default_pattern =  { {symbol, sign, none, value} };
    00505
    00506   template<>
    00507     const ctype<char>&
    00508     use_facet<ctype<char> >(const locale& __loc)
    00509     {
    00510       size_t __i = ctype<char>::id._M_id();
    00511       const locale::_Impl* __tmp = __loc._M_impl;
    00512       return static_cast<const ctype<char>&>(*(__tmp->_M_facets[__i]));
    00513     }
    00514
    00515 #ifdef _GLIBCPP_USE_WCHAR_T
    00516   template<>
    00517     const ctype<wchar_t>&
    00518     use_facet<ctype<wchar_t> >(const locale& __loc)
    00519     {
    00520       size_t __i = ctype<wchar_t>::id._M_id();
    00521       const locale::_Impl* __tmp = __loc._M_impl;
    00522       return static_cast<const ctype<wchar_t>&>(*(__tmp->_M_facets[__i]));
    00523     }
    00524 #endif
    00525
    00526   const char __num_base::_S_atoms[] = "0123456789eEabcdfABCDF";
    00527
    00528   bool
    00529   __num_base::_S_format_float(const ios_base& __io, char* __fptr, char __mod,
    00530                   streamsize __prec)
    00531   {
    00532     bool __incl_prec = false;
    00533     ios_base::fmtflags __flags = __io.flags();
    00534     *__fptr++ = '%';
    00535     // [22.2.2.2.2] Table 60
    00536     if (__flags & ios_base::showpos)
    00537       *__fptr++ = '+';
    00538     if (__flags & ios_base::showpoint)
    00539       *__fptr++ = '#';
    00540     // As per [22.2.2.2.2.11]
    00541     if (__flags & ios_base::fixed || __prec > 0)
    00542       {
    00543     *__fptr++ = '.';
    00544     *__fptr++ = '*';
    00545     __incl_prec = true;
    00546       }
    00547     if (__mod)
    00548       *__fptr++ = __mod;
    00549     ios_base::fmtflags __fltfield = __flags & ios_base::floatfield;
    00550     // [22.2.2.2.2] Table 58
    00551     if (__fltfield == ios_base::fixed)
    00552       *__fptr++ = 'f';
    00553     else if (__fltfield == ios_base::scientific)
    00554       *__fptr++ = (__flags & ios_base::uppercase) ? 'E' : 'e';
    00555     else
    00556       *__fptr++ = (__flags & ios_base::uppercase) ? 'G' : 'g';
    00557     *__fptr = '\0';
    00558     return __incl_prec;
    00559   }
    00560
    00561   void
    00562   __num_base::_S_format_int(const ios_base& __io, char* __fptr, char __mod,
    00563                 char __modl)
    00564   {
    00565     ios_base::fmtflags __flags = __io.flags();
    00566     *__fptr++ = '%';
    00567     // [22.2.2.2.2] Table 60
    00568     if (__flags & ios_base::showpos)
    00569       *__fptr++ = '+';
    00570     if (__flags & ios_base::showbase)
    00571       *__fptr++ = '#';
    00572     *__fptr++ = 'l';
    00573
    00574     // For long long types.
    00575     if (__modl)
    00576       *__fptr++ = __modl;
    00577
    00578     ios_base::fmtflags __bsefield = __flags & ios_base::basefield;
    00579     if (__bsefield == ios_base::hex)
    00580       *__fptr++ = (__flags & ios_base::uppercase) ? 'X' : 'x';
    00581     else if (__bsefield == ios_base::oct)
    00582       *__fptr++ = 'o';
    00583     else
    00584       *__fptr++ = __mod;
    00585     *__fptr = '\0';
    00586   }
    00587 } // namespace std
    00588