libstdc++-v3/src/localename.cc

   1 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   2 // 2006, 2007, 2008, 2009, 2010
   3 // Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 #include <clocale>
  26 #include <cstring>
  27 #include <cstdlib>
  28 #include <locale>
  29
  30 _GLIBCXX_BEGIN_NAMESPACE(std)
  31
  32   using namespace __gnu_cxx;
  33
  34   locale::locale(const char* __s) : _M_impl(0)
  35   {
  36     if (__s)
  37       {
  38         _S_initialize();
  39         if (std::strcmp(__s, "C") == 0 || std::strcmp(__s, "POSIX") == 0)
  40           (_M_impl = _S_classic)->_M_add_reference();
  41         else if (std::strcmp(__s, "") != 0)
  42           _M_impl = new _Impl(__s, 1);
  43         else
  44           {
  45             // Get it from the environment.
  46             char* __env = std::getenv("LC_ALL");
  47             // If LC_ALL is set we are done.
  48             if (__env && std::strcmp(__env, "") != 0)
  49               {
  50                 if (std::strcmp(__env, "C") == 0
  51                     || std::strcmp(__env, "POSIX") == 0)
  52                   (_M_impl = _S_classic)->_M_add_reference();
  53                 else
  54                   _M_impl = new _Impl(__env, 1);
  55               }
  56             else
  57               {
  58                 // LANG may set a default different from "C".
  59                 string __lang;
  60                 __env = std::getenv("LANG");
  61                 if (!__env || std::strcmp(__env, "") == 0
  62                     || std::strcmp(__env, "C") == 0
  63                     || std::strcmp(__env, "POSIX") == 0)
  64                   __lang = "C";
  65                 else
  66                   __lang = __env;
  67
  68                 // Scan the categories looking for the first one
  69                 // different from LANG.
  70                 size_t __i = 0;
  71                 if (__lang == "C")
  72                   for (; __i < _S_categories_size; ++__i)
  73                     {
  74                       __env = std::getenv(_S_categories[__i]);
  75                       if (__env && std::strcmp(__env, "") != 0
  76                           && std::strcmp(__env, "C") != 0
  77                           && std::strcmp(__env, "POSIX") != 0)
  78                         break;
  79                     }
  80                 else
  81                   for (; __i < _S_categories_size; ++__i)
  82                     {
  83                       __env = std::getenv(_S_categories[__i]);
  84                       if (__env && std::strcmp(__env, "") != 0
  85                           && __lang != __env)
  86                         break;
  87                     }
  88
  89                 // If one is found, build the complete string of
  90                 // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...
  91                 if (__i < _S_categories_size)
  92                   {
  93                     string __str;
  94                     __str.reserve(128);
  95                     for (size_t __j = 0; __j < __i; ++__j)
  96                       {
  97                         __str += _S_categories[__j];
  98                         __str += '=';
  99                         __str += __lang;
 100                         __str += ';';
 101                       }
 102                     __str += _S_categories[__i];
 103                     __str += '=';
 104                     __str += __env;
 105                     __str += ';';
 106                     ++__i;
 107                     for (; __i < _S_categories_size; ++__i)
 108                       {
 109                         __env = std::getenv(_S_categories[__i]);
 110                         __str += _S_categories[__i];
 111                         if (!__env || std::strcmp(__env, "") == 0)
 112                           {
 113                             __str += '=';
 114                             __str += __lang;
 115                             __str += ';';
 116                           }
 117                         else if (std::strcmp(__env, "C") == 0
 118                                  || std::strcmp(__env, "POSIX") == 0)
 119                           __str += "=C;";
 120                         else
 121                           {
 122                             __str += '=';
 123                             __str += __env;
 124                             __str += ';';
 125                           }
 126                       }
 127                     __str.erase(__str.end() - 1);
 128                     _M_impl = new _Impl(__str.c_str(), 1);
 129                   }
 130                 // ... otherwise either an additional instance of
 131                 // the "C" locale or LANG.
 132                 else if (__lang == "C")
 133                   (_M_impl = _S_classic)->_M_add_reference();
 134                 else
 135                   _M_impl = new _Impl(__lang.c_str(), 1);
 136               }
 137           }
 138       }
 139     else
 140       __throw_runtime_error(__N("locale::locale null not valid"));
 141   }
 142
 143   locale::locale(const locale& __base, const char* __s, category __cat)
 144   : _M_impl(0)
 145   {
 146     // NB: There are complicated, yet more efficient ways to do
 147     // this. Building up locales on a per-category way is tedious, so
 148     // let's do it this way until people complain.
 149     locale __add(__s);
 150     _M_coalesce(__base, __add, __cat);
 151   }
 152
 153   locale::locale(const locale& __base, const locale& __add, category __cat)
 154   : _M_impl(0)
 155   { _M_coalesce(__base, __add, __cat); }
 156
 157   void
 158   locale::_M_coalesce(const locale& __base, const locale& __add,
 159                       category __cat)
 160   {
 161     __cat = _S_normalize_category(__cat);
 162     _M_impl = new _Impl(*__base._M_impl, 1);
 163
 164     __try
 165       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
 166     __catch(...)
 167       {
 168         _M_impl->_M_remove_reference();
 169         __throw_exception_again;
 170       }
 171   }
 172
 173   // Construct named _Impl.
 174   locale::_Impl::
 175   _Impl(const char* __s, size_t __refs)
 176   : _M_refcount(__refs), _M_facets(0), _M_facets_size(_GLIBCXX_NUM_FACETS),
 177     _M_caches(0), _M_names(0)
 178   {
 179     // Initialize the underlying locale model, which also checks to
 180     // see if the given name is valid.
 181     __c_locale __cloc;
 182     locale::facet::_S_create_c_locale(__cloc, __s);
 183     __c_locale __clocm = __cloc;
 184
 185     __try
 186       {
 187         _M_facets = new const facet*[_M_facets_size];
 188         for (size_t __i = 0; __i < _M_facets_size; ++__i)
 189           _M_facets[__i] = 0;
 190         _M_caches = new const facet*[_M_facets_size];
 191         for (size_t __j = 0; __j < _M_facets_size; ++__j)
 192           _M_caches[__j] = 0;
 193         _M_names = new char*[_S_categories_size];
 194         for (size_t __k = 0; __k < _S_categories_size; ++__k)
 195           _M_names[__k] = 0;
 196
 197         // Name the categories.
 198         const char* __smon = __s;
 199         const size_t __len = std::strlen(__s);
 200         if (!std::memchr(__s, ';', __len))
 201           {
 202             _M_names[0] = new char[__len + 1];
 203             std::memcpy(_M_names[0], __s, __len + 1);
 204           }
 205         else
 206           {
 207             const char* __end = __s;
 208             bool __found_ctype = false;
 209             bool __found_monetary = false;
 210             size_t __ci = 0, __mi = 0;
 211             for (size_t __i = 0; __i < _S_categories_size; ++__i)
 212               {
 213                 const char* __beg = std::strchr(__end + 1, '=') + 1;
 214                 __end = std::strchr(__beg, ';');
 215                 if (!__end)
 216                   __end = __s + __len;
 217                 _M_names[__i] = new char[__end - __beg + 1];
 218                 std::memcpy(_M_names[__i], __beg, __end - __beg);
 219                 _M_names[__i][__end - __beg] = '\0';
 220                 if (!__found_ctype
 221                     && *(__beg - 2) == 'E' && *(__beg - 3) == 'P')
 222                   {
 223                     __found_ctype = true;
 224                     __ci = __i;
 225                   }
 226                 else if (!__found_monetary && *(__beg - 2) == 'Y')
 227                   {
 228                     __found_monetary = true;
 229                     __mi = __i;
 230                   }
 231               }
 232
 233             if (std::strcmp(_M_names[__ci], _M_names[__mi]))
 234               {
 235                 __smon = _M_names[__mi];
 236                 __clocm = locale::facet::_S_lc_ctype_c_locale(__cloc,
 237                                                               __smon);
 238               }
 239           }
 240
 241         // Construct all standard facets and add them to _M_facets.
 242         _M_init_facet(new std::ctype<char>(__cloc, 0, false));
 243         _M_init_facet(new codecvt<char, char, mbstate_t>(__cloc));
 244         _M_init_facet(new numpunct<char>(__cloc));
 245         _M_init_facet(new num_get<char>);
 246         _M_init_facet(new num_put<char>);
 247         _M_init_facet(new std::collate<char>(__cloc));
 248         _M_init_facet(new moneypunct<char, false>(__cloc, 0));
 249         _M_init_facet(new moneypunct<char, true>(__cloc, 0));
 250         _M_init_facet(new money_get<char>);
 251         _M_init_facet(new money_put<char>);
 252         _M_init_facet(new __timepunct<char>(__cloc, __s));
 253         _M_init_facet(new time_get<char>);
 254         _M_init_facet(new time_put<char>);
 255         _M_init_facet(new std::messages<char>(__cloc, __s));
 256
 257 #ifdef  _GLIBCXX_USE_WCHAR_T
 258         _M_init_facet(new std::ctype<wchar_t>(__cloc));
 259         _M_init_facet(new codecvt<wchar_t, char, mbstate_t>(__cloc));
 260         _M_init_facet(new numpunct<wchar_t>(__cloc));
 261         _M_init_facet(new num_get<wchar_t>);
 262         _M_init_facet(new num_put<wchar_t>);
 263         _M_init_facet(new std::collate<wchar_t>(__cloc));
 264         _M_init_facet(new moneypunct<wchar_t, false>(__clocm, __smon));
 265         _M_init_facet(new moneypunct<wchar_t, true>(__clocm, __smon));
 266         _M_init_facet(new money_get<wchar_t>);
 267         _M_init_facet(new money_put<wchar_t>);
 268         _M_init_facet(new __timepunct<wchar_t>(__cloc, __s));
 269         _M_init_facet(new time_get<wchar_t>);
 270         _M_init_facet(new time_put<wchar_t>);
 271         _M_init_facet(new std::messages<wchar_t>(__cloc, __s));
 272 #endif
 273         locale::facet::_S_destroy_c_locale(__cloc);
 274         if (__clocm != __cloc)
 275           locale::facet::_S_destroy_c_locale(__clocm);
 276       }
 277     __catch(...)
 278       {
 279         locale::facet::_S_destroy_c_locale(__cloc);
 280         if (__clocm != __cloc)
 281           locale::facet::_S_destroy_c_locale(__clocm);
 282         this->~_Impl();
 283         __throw_exception_again;
 284       }
 285   }
 286
 287   void
 288   locale::_Impl::
 289   _M_replace_categories(const _Impl* __imp, category __cat)
 290   {
 291     category __mask = 1;
 292     if (!_M_names[0] || !__imp->_M_names[0])
 293       {
 294         if (_M_names[0])
 295           {
 296             delete [] _M_names[0];
 297             _M_names[0] = 0;   // Unnamed.
 298           }
 299
 300         for (size_t __ix = 0; __ix < _S_categories_size; ++__ix, __mask <<= 1)
 301           {
 302             if (__mask & __cat)
 303               // Need to replace entry in _M_facets with other locale's info.
 304               _M_replace_category(__imp, _S_facet_categories[__ix]);
 305           }
 306       }
 307     else
 308       {
 309         if (!_M_names[1])
 310           {
 311             // A full set of _M_names must be prepared, all identical
 312             // to _M_names[0] to begin with. Then, below, a few will
 313             // be replaced by the corresponding __imp->_M_names. I.e.,
 314             // not a "simple" locale anymore (see locale::operator==).
 315             const size_t __len = std::strlen(_M_names[0]) + 1;
 316             for (size_t __i = 1; __i < _S_categories_size; ++__i)
 317               {
 318                 _M_names[__i] = new char[__len];
 319                 std::memcpy(_M_names[__i], _M_names[0], __len);
 320               }
 321           }
 322
 323         for (size_t __ix = 0; __ix < _S_categories_size; ++__ix, __mask <<= 1)
 324           {
 325             if (__mask & __cat)
 326               {
 327                 // Need to replace entry in _M_facets with other locale's info.
 328                 _M_replace_category(__imp, _S_facet_categories[__ix]);
 329
 330                 // FIXME: Hack for libstdc++/29217: the numerical encodings
 331                 // of the time and collate categories are swapped vs the
 332                 // order of the names in locale::_S_categories.  We'd like to
 333                 // adjust the former (the latter is dictated by compatibility
 334                 // with glibc) but we can't for binary compatibility.
 335                 size_t __ix_name = __ix;
 336                 if (__ix == 2 || __ix == 3)
 337                   __ix_name = 5 - __ix;
 338
 339                 char* __src = __imp->_M_names[__ix_name] ?
 340                               __imp->_M_names[__ix_name] : __imp->_M_names[0];
 341                 const size_t __len = std::strlen(__src) + 1;
 342                 char* __new = new char[__len];
 343                 std::memcpy(__new, __src, __len);
 344                 delete [] _M_names[__ix_name];
 345                 _M_names[__ix_name] = __new;
 346               }
 347           }
 348       }
 349   }
 350
 351 _GLIBCXX_END_NAMESPACE