libstdc++-v3/src/localename.cc

   1 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
   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
   7 // Free Software Foundation; either version 2, or (at your option)
   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
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License along
  16 // with this library; see the file COPYING.  If not, write to the Free
  17 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  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 <locale>
  32
  33 _GLIBCXX_BEGIN_NAMESPACE(std)
  34
  35   using namespace __gnu_cxx;
  36
  37   locale::locale(const char* __s) : _M_impl(0)
  38   {
  39     if (__s)
  40       {
  41         _S_initialize();
  42         if (std::strcmp(__s, "C") == 0 || std::strcmp(__s, "POSIX") == 0)
  43           (_M_impl = _S_classic)->_M_add_reference();
  44         else if (std::strcmp(__s, "") != 0)
  45           _M_impl = new _Impl(__s, 1);
  46         else
  47           {
  48             // Get it from the environment.
  49             char* __env = std::getenv("LC_ALL");
  50             // If LC_ALL is set we are done.
  51             if (__env && std::strcmp(__env, "") != 0)
  52               {
  53                 if (std::strcmp(__env, "C") == 0
  54                     || std::strcmp(__env, "POSIX") == 0)
  55                   (_M_impl = _S_classic)->_M_add_reference();
  56                 else
  57                   _M_impl = new _Impl(__env, 1);
  58               }
  59             else
  60               {
  61                 // LANG may set a default different from "C".
  62                 string __lang;
  63                 __env = std::getenv("LANG");
  64                 if (!__env || std::strcmp(__env, "") == 0
  65                     || std::strcmp(__env, "C") == 0
  66                     || std::strcmp(__env, "POSIX") == 0)
  67                   __lang = "C";
  68                 else
  69                   __lang = __env;
  70
  71                 // Scan the categories looking for the first one
  72                 // different from LANG.
  73                 size_t __i = 0;
  74                 if (__lang == "C")
  75                   for (; __i < _S_categories_size; ++__i)
  76                     {
  77                       __env = std::getenv(_S_categories[__i]);
  78                       if (__env && std::strcmp(__env, "") != 0
  79                           && std::strcmp(__env, "C") != 0
  80                           && std::strcmp(__env, "POSIX") != 0)
  81                         break;
  82                     }
  83                 else
  84                   for (; __i < _S_categories_size; ++__i)
  85                     {
  86                       __env = std::getenv(_S_categories[__i]);
  87                       if (__env && std::strcmp(__env, "") != 0
  88                           && __lang != __env)
  89                         break;
  90                     }
  91
  92                 // If one is found, build the complete string of
  93                 // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...
  94                 if (__i < _S_categories_size)
  95                   {
  96                     string __str;
  97                     __str.reserve(128);
  98                     for (size_t __j = 0; __j < __i; ++__j)
  99                       {
 100                         __str += _S_categories[__j];
 101                         __str += '=';
 102                         __str += __lang;
 103                         __str += ';';
 104                       }
 105                     __str += _S_categories[__i];
 106                     __str += '=';
 107                     __str += __env;
 108                     __str += ';';
 109                     ++__i;
 110                     for (; __i < _S_categories_size; ++__i)
 111                       {
 112                         __env = std::getenv(_S_categories[__i]);
 113                         __str += _S_categories[__i];
 114                         if (!__env || std::strcmp(__env, "") == 0)
 115                           {
 116                             __str += '=';
 117                             __str += __lang;
 118                             __str += ';';
 119                           }
 120                         else if (std::strcmp(__env, "C") == 0
 121                                  || std::strcmp(__env, "POSIX") == 0)
 122                           __str += "=C;";
 123                         else
 124                           {
 125                             __str += '=';
 126                             __str += __env;
 127                             __str += ';';
 128                           }
 129                       }
 130                     __str.erase(__str.end() - 1);
 131                     _M_impl = new _Impl(__str.c_str(), 1);
 132                   }
 133                 // ... otherwise either an additional instance of
 134                 // the "C" locale or LANG.
 135                 else if (__lang == "C")
 136                   (_M_impl = _S_classic)->_M_add_reference();
 137                 else
 138                   _M_impl = new _Impl(__lang.c_str(), 1);
 139               }
 140           }
 141       }
 142     else
 143       __throw_runtime_error(__N("locale::locale NULL not valid"));
 144   }
 145
 146   locale::locale(const locale& __base, const char* __s, category __cat)
 147   : _M_impl(0)
 148   {
 149     // NB: There are complicated, yet more efficient ways to do
 150     // this. Building up locales on a per-category way is tedious, so
 151     // let's do it this way until people complain.
 152     locale __add(__s);
 153     _M_coalesce(__base, __add, __cat);
 154   }
 155
 156   locale::locale(const locale& __base, const locale& __add, category __cat)
 157   : _M_impl(0)
 158   { _M_coalesce(__base, __add, __cat); }
 159
 160   void
 161   locale::_M_coalesce(const locale& __base, const locale& __add,
 162                       category __cat)
 163   {
 164     __cat = _S_normalize_category(__cat);
 165     _M_impl = new _Impl(*__base._M_impl, 1);
 166
 167     try
 168       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
 169     catch (...)
 170       {
 171         _M_impl->_M_remove_reference();
 172         __throw_exception_again;
 173       }
 174   }
 175
 176   // Construct named _Impl.
 177   locale::_Impl::
 178   _Impl(const char* __s, size_t __refs)
 179   : _M_refcount(__refs), _M_facets(0), _M_facets_size(_GLIBCXX_NUM_FACETS),
 180     _M_caches(0), _M_names(0)
 181   {
 182     // Initialize the underlying locale model, which also checks to
 183     // see if the given name is valid.
 184     __c_locale __cloc;
 185     locale::facet::_S_create_c_locale(__cloc, __s);
 186
 187     try
 188       {
 189         _M_facets = new const facet*[_M_facets_size];
 190         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 191           _M_facets[__i] = 0;
 192         _M_caches = new const facet*[_M_facets_size];
 193         for (size_t __j = 0; __j < _M_facets_size; ++__j)
 194           _M_caches[__j] = 0;
 195         _M_names = new char*[_S_categories_size];
 196         for (size_t __k = 0; __k < _S_categories_size; ++__k)
 197           _M_names[__k] = 0;
 198
 199         // Name the categories.
 200         const size_t __len = std::strlen(__s);
 201         if (!std::memchr(__s, ';', __len))
 202           {
 203             _M_names[0] = new char[__len + 1];
 204             std::memcpy(_M_names[0], __s, __len + 1);
 205           }
 206         else
 207           {
 208             const char* __end = __s;
 209             for (size_t __i = 0; __i < _S_categories_size; ++__i)
 210               {
 211                 const char* __beg = std::strchr(__end + 1, '=') + 1;
 212                 __end = std::strchr(__beg, ';');
 213                 if (!__end)
 214                   __end = __s + __len;
 215                 _M_names[__i] = new char[__end - __beg + 1];
 216                 std::memcpy(_M_names[__i], __beg, __end - __beg);
 217                 _M_names[__i][__end - __beg] = '\0';
 218               }
 219           }
 220
 221         // Construct all standard facets and add them to _M_facets.
 222         _M_init_facet(new std::ctype<char>(__cloc, 0, false));
 223         _M_init_facet(new codecvt<char, char, mbstate_t>(__cloc));
 224         _M_init_facet(new numpunct<char>(__cloc));
 225         _M_init_facet(new num_get<char>);
 226         _M_init_facet(new num_put<char>);
 227         _M_init_facet(new std::collate<char>(__cloc));
 228         _M_init_facet(new moneypunct<char, false>(__cloc, __s));
 229         _M_init_facet(new moneypunct<char, true>(__cloc, __s));
 230         _M_init_facet(new money_get<char>);
 231         _M_init_facet(new money_put<char>);
 232         _M_init_facet(new __timepunct<char>(__cloc, __s));
 233         _M_init_facet(new time_get<char>);
 234         _M_init_facet(new time_put<char>);
 235         _M_init_facet(new std::messages<char>(__cloc, __s));
 236
 237 #ifdef  _GLIBCXX_USE_WCHAR_T
 238         _M_init_facet(new std::ctype<wchar_t>(__cloc));
 239         _M_init_facet(new codecvt<wchar_t, char, mbstate_t>(__cloc));
 240         _M_init_facet(new numpunct<wchar_t>(__cloc));
 241         _M_init_facet(new num_get<wchar_t>);
 242         _M_init_facet(new num_put<wchar_t>);
 243         _M_init_facet(new std::collate<wchar_t>(__cloc));
 244         _M_init_facet(new moneypunct<wchar_t, false>(__cloc, __s));
 245         _M_init_facet(new moneypunct<wchar_t, true>(__cloc, __s));
 246         _M_init_facet(new money_get<wchar_t>);
 247         _M_init_facet(new money_put<wchar_t>);
 248         _M_init_facet(new __timepunct<wchar_t>(__cloc, __s));
 249         _M_init_facet(new time_get<wchar_t>);
 250         _M_init_facet(new time_put<wchar_t>);
 251         _M_init_facet(new std::messages<wchar_t>(__cloc, __s));
 252 #endif
 253         locale::facet::_S_destroy_c_locale(__cloc);
 254       }
 255     catch(...)
 256       {
 257         locale::facet::_S_destroy_c_locale(__cloc);
 258         this->~_Impl();
 259         __throw_exception_again;
 260       }
 261   }
 262
 263   void
 264   locale::_Impl::
 265   _M_replace_categories(const _Impl* __imp, category __cat)
 266   {
 267     category __mask = 1;
 268     const bool __have_names = _M_names[0] && __imp->_M_names[0];
 269     for (size_t __ix = 0; __ix < _S_categories_size; ++__ix, __mask <<= 1)
 270       {
 271         if (__mask & __cat)
 272           {
 273             // Need to replace entry in _M_facets with other locale's info.
 274             _M_replace_category(__imp, _S_facet_categories[__ix]);
 275             // If both have names, go ahead and mangle.
 276             if (__have_names)
 277               {
 278                 if (!_M_names[1])
 279                   {
 280                     // A full set of _M_names must be prepared, all identical
 281                     // to _M_names[0] to begin with. Then, below, a few will
 282                     // be replaced by the corresponding __imp->_M_names. I.e.,
 283                     // not a "simple" locale anymore (see locale::operator==).
 284                     const size_t __len = std::strlen(_M_names[0]) + 1;
 285                     for (size_t __i = 1; __i < _S_categories_size; ++__i)
 286                       {
 287                         _M_names[__i] = new char[__len];
 288                         std::memcpy(_M_names[__i], _M_names[0], __len);
 289                       }
 290                   }
 291                 char* __src = __imp->_M_names[__ix] ? __imp->_M_names[__ix]
 292                                                     : __imp->_M_names[0];
 293                 const size_t __len = std::strlen(__src) + 1;
 294                 char* __new = new char[__len];
 295                 std::memcpy(__new, __src, __len);
 296                 delete [] _M_names[__ix];
 297                 _M_names[__ix] = __new;
 298               }
 299           }
 300       }
 301   }
 302
 303 _GLIBCXX_END_NAMESPACE