libstdc++-v3/src/c++98/localename.cc

   1 // Copyright (C) 1997-2016 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // Under Section 7 of GPL version 3, you are granted additional
  15 // permissions described in the GCC Runtime Library Exception, version
  16 // 3.1, as published by the Free Software Foundation.
  17
  18 // You should have received a copy of the GNU General Public License and
  19 // a copy of the GCC Runtime Library Exception along with this program;
  20 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 #define _GLIBCXX_USE_CXX11_ABI 1
  24 #include <clocale>
  25 #include <cstring>
  26 #include <cstdlib>
  27 #include <locale>
  28
  29 namespace std _GLIBCXX_VISIBILITY(default)
  30 {
  31 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  32
  33   using namespace __gnu_cxx;
  34
  35   locale::locale(const char* __s) : _M_impl(0)
  36   {
  37     if (__s)
  38       {
  39         _S_initialize();
  40         if (std::strcmp(__s, "C") == 0 || std::strcmp(__s, "POSIX") == 0)
  41           (_M_impl = _S_classic)->_M_add_reference();
  42         else if (std::strcmp(__s, "") != 0)
  43           _M_impl = new _Impl(__s, 1);
  44         else
  45           {
  46             // Get it from the environment.
  47             char* __env = std::getenv("LC_ALL");
  48             // If LC_ALL is set we are done.
  49             if (__env && std::strcmp(__env, "") != 0)
  50               {
  51                 if (std::strcmp(__env, "C") == 0
  52                     || std::strcmp(__env, "POSIX") == 0)
  53                   (_M_impl = _S_classic)->_M_add_reference();
  54                 else
  55                   _M_impl = new _Impl(__env, 1);
  56               }
  57             else
  58               {
  59                 // LANG may set a default different from "C".
  60                 string __lang;
  61                 __env = std::getenv("LANG");
  62                 if (!__env || std::strcmp(__env, "") == 0
  63                     || std::strcmp(__env, "C") == 0
  64                     || std::strcmp(__env, "POSIX") == 0)
  65                   __lang = "C";
  66                 else
  67                   __lang = __env;
  68
  69                 // Scan the categories looking for the first one
  70                 // different from LANG.
  71                 size_t __i = 0;
  72                 if (__lang == "C")
  73                   for (; __i < _S_categories_size; ++__i)
  74                     {
  75                       __env = std::getenv(_S_categories[__i]);
  76                       if (__env && std::strcmp(__env, "") != 0
  77                           && std::strcmp(__env, "C") != 0
  78                           && std::strcmp(__env, "POSIX") != 0)
  79                         break;
  80                     }
  81                 else
  82                   for (; __i < _S_categories_size; ++__i)
  83                     {
  84                       __env = std::getenv(_S_categories[__i]);
  85                       if (__env && std::strcmp(__env, "") != 0
  86                           && __lang != __env)
  87                         break;
  88                     }
  89
  90                 // If one is found, build the complete string of
  91                 // the form LC_CTYPE=xxx;LC_NUMERIC=yyy; and so on...
  92                 if (__i < _S_categories_size)
  93                   {
  94                     string __str;
  95                     __str.reserve(128);
  96                     for (size_t __j = 0; __j < __i; ++__j)
  97                       {
  98                         __str += _S_categories[__j];
  99                         __str += '=';
 100                         __str += __lang;
 101                         __str += ';';
 102                       }
 103                     __str += _S_categories[__i];
 104                     __str += '=';
 105                     __str += __env;
 106                     __str += ';';
 107                     ++__i;
 108                     for (; __i < _S_categories_size; ++__i)
 109                       {
 110                         __env = std::getenv(_S_categories[__i]);
 111                         __str += _S_categories[__i];
 112                         if (!__env || std::strcmp(__env, "") == 0)
 113                           {
 114                             __str += '=';
 115                             __str += __lang;
 116                             __str += ';';
 117                           }
 118                         else if (std::strcmp(__env, "C") == 0
 119                                  || std::strcmp(__env, "POSIX") == 0)
 120                           __str += "=C;";
 121                         else
 122                           {
 123                             __str += '=';
 124                             __str += __env;
 125                             __str += ';';
 126                           }
 127                       }
 128                     __str.erase(__str.end() - 1);
 129                     _M_impl = new _Impl(__str.c_str(), 1);
 130                   }
 131                 // ... otherwise either an additional instance of
 132                 // the "C" locale or LANG.
 133                 else if (__lang == "C")
 134                   (_M_impl = _S_classic)->_M_add_reference();
 135                 else
 136                   _M_impl = new _Impl(__lang.c_str(), 1);
 137               }
 138           }
 139       }
 140     else
 141       __throw_runtime_error(__N("locale::locale null not valid"));
 142   }
 143
 144   locale::locale(const locale& __base, const char* __s, category __cat)
 145   : _M_impl(0)
 146   {
 147     // NB: There are complicated, yet more efficient ways to do
 148     // this. Building up locales on a per-category way is tedious, so
 149     // let's do it this way until people complain.
 150     locale __add(__s);
 151     _M_coalesce(__base, __add, __cat);
 152   }
 153
 154   locale::locale(const locale& __base, const locale& __add, category __cat)
 155   : _M_impl(0)
 156   { _M_coalesce(__base, __add, __cat); }
 157
 158   void
 159   locale::_M_coalesce(const locale& __base, const locale& __add,
 160                       category __cat)
 161   {
 162     __cat = _S_normalize_category(__cat);
 163     _M_impl = new _Impl(*__base._M_impl, 1);
 164
 165     __try
 166       { _M_impl->_M_replace_categories(__add._M_impl, __cat); }
 167     __catch(...)
 168       {
 169         _M_impl->_M_remove_reference();
 170         __throw_exception_again;
 171       }
 172   }
 173
 174 const int num_facets = _GLIBCXX_NUM_FACETS + _GLIBCXX_NUM_UNICODE_FACETS
 175   + (_GLIBCXX_USE_DUAL_ABI ? _GLIBCXX_NUM_CXX11_FACETS : 0);
 176
 177   // Construct named _Impl.
 178   locale::_Impl::
 179   _Impl(const char* __s, size_t __refs)
 180   : _M_refcount(__refs), _M_facets(0), _M_facets_size(num_facets),
 181     _M_caches(0), _M_names(0)
 182   {
 183     // Initialize the underlying locale model, which also checks to
 184     // see if the given name is valid.
 185     __c_locale __cloc;
 186     locale::facet::_S_create_c_locale(__cloc, __s);
 187     __c_locale __clocm = __cloc;
 188
 189     __try
 190       {
 191         _M_facets = new const facet*[_M_facets_size]();
 192         _M_caches = new const facet*[_M_facets_size]();
 193         _M_names = new char*[_S_categories_size]();
 194
 195         // Name the categories.
 196         const char* __smon = __s;
 197         const size_t __len = std::strlen(__s);
 198         if (!std::memchr(__s, ';', __len))
 199           {
 200             _M_names[0] = new char[__len + 1];
 201             std::memcpy(_M_names[0], __s, __len + 1);
 202           }
 203         else
 204           {
 205             const char* __end = __s;
 206             bool __found_ctype = false;
 207             bool __found_monetary = false;
 208             size_t __ci = 0, __mi = 0;
 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                 if (!__found_ctype
 219                     && *(__beg - 2) == 'E' && *(__beg - 3) == 'P')
 220                   {
 221                     __found_ctype = true;
 222                     __ci = __i;
 223                   }
 224                 else if (!__found_monetary && *(__beg - 2) == 'Y')
 225                   {
 226                     __found_monetary = true;
 227                     __mi = __i;
 228                   }
 229               }
 230
 231             if (std::strcmp(_M_names[__ci], _M_names[__mi]))
 232               {
 233                 __smon = _M_names[__mi];
 234                 __clocm = locale::facet::_S_lc_ctype_c_locale(__cloc,
 235                                                               __smon);
 236               }
 237           }
 238
 239         // Construct all standard facets and add them to _M_facets.
 240         _M_init_facet(new std::ctype<char>(__cloc, 0, false));
 241         _M_init_facet(new codecvt<char, char, mbstate_t>(__cloc));
 242         _M_init_facet(new numpunct<char>(__cloc));
 243         _M_init_facet(new num_get<char>);
 244         _M_init_facet(new num_put<char>);
 245         _M_init_facet(new std::collate<char>(__cloc));
 246         _M_init_facet(new moneypunct<char, false>(__cloc, 0));
 247         _M_init_facet(new moneypunct<char, true>(__cloc, 0));
 248         _M_init_facet(new money_get<char>);
 249         _M_init_facet(new money_put<char>);
 250         _M_init_facet(new __timepunct<char>(__cloc, __s));
 251         _M_init_facet(new time_get<char>);
 252         _M_init_facet(new time_put<char>);
 253         _M_init_facet(new std::messages<char>(__cloc, __s));
 254
 255 #ifdef  _GLIBCXX_USE_WCHAR_T
 256         _M_init_facet(new std::ctype<wchar_t>(__cloc));
 257         _M_init_facet(new codecvt<wchar_t, char, mbstate_t>(__cloc));
 258         _M_init_facet(new numpunct<wchar_t>(__cloc));
 259         _M_init_facet(new num_get<wchar_t>);
 260         _M_init_facet(new num_put<wchar_t>);
 261         _M_init_facet(new std::collate<wchar_t>(__cloc));
 262         _M_init_facet(new moneypunct<wchar_t, false>(__clocm, __smon));
 263         _M_init_facet(new moneypunct<wchar_t, true>(__clocm, __smon));
 264         _M_init_facet(new money_get<wchar_t>);
 265         _M_init_facet(new money_put<wchar_t>);
 266         _M_init_facet(new __timepunct<wchar_t>(__cloc, __s));
 267         _M_init_facet(new time_get<wchar_t>);
 268         _M_init_facet(new time_put<wchar_t>);
 269         _M_init_facet(new std::messages<wchar_t>(__cloc, __s));
 270 #endif
 271
 272 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
 273         _M_init_facet(new codecvt<char16_t, char, mbstate_t>);
 274         _M_init_facet(new codecvt<char32_t, char, mbstate_t>);
 275 #endif
 276
 277 #if _GLIBCXX_USE_DUAL_ABI
 278         _M_init_extra(&__cloc, &__clocm, __s, __smon);
 279 #endif
 280
 281         locale::facet::_S_destroy_c_locale(__cloc);
 282         if (__clocm != __cloc)
 283           locale::facet::_S_destroy_c_locale(__clocm);
 284       }
 285     __catch(...)
 286       {
 287         locale::facet::_S_destroy_c_locale(__cloc);
 288         if (__clocm != __cloc)
 289           locale::facet::_S_destroy_c_locale(__clocm);
 290         this->~_Impl();
 291         __throw_exception_again;
 292       }
 293   }
 294
 295   void
 296   locale::_Impl::
 297   _M_replace_categories(const _Impl* __imp, category __cat)
 298   {
 299     category __mask = 1;
 300     if (!_M_names[0] || !__imp->_M_names[0])
 301       {
 302         if (_M_names[0])
 303           {
 304             delete [] _M_names[0];
 305             _M_names[0] = 0;   // Unnamed.
 306           }
 307
 308         for (size_t __ix = 0; __ix < _S_categories_size; ++__ix, __mask <<= 1)
 309           {
 310             if (__mask & __cat)
 311               // Need to replace entry in _M_facets with other locale's info.
 312               _M_replace_category(__imp, _S_facet_categories[__ix]);
 313           }
 314       }
 315     else
 316       {
 317         if (!_M_names[1])
 318           {
 319             // A full set of _M_names must be prepared, all identical
 320             // to _M_names[0] to begin with. Then, below, a few will
 321             // be replaced by the corresponding __imp->_M_names. I.e.,
 322             // not a "simple" locale anymore (see locale::operator==).
 323             const size_t __len = std::strlen(_M_names[0]) + 1;
 324             for (size_t __i = 1; __i < _S_categories_size; ++__i)
 325               {
 326                 _M_names[__i] = new char[__len];
 327                 std::memcpy(_M_names[__i], _M_names[0], __len);
 328               }
 329           }
 330
 331         for (size_t __ix = 0; __ix < _S_categories_size; ++__ix, __mask <<= 1)
 332           {
 333             if (__mask & __cat)
 334               {
 335                 // Need to replace entry in _M_facets with other locale's info.
 336                 _M_replace_category(__imp, _S_facet_categories[__ix]);
 337
 338                 // FIXME: Hack for libstdc++/29217: the numerical encodings
 339                 // of the time and collate categories are swapped vs the
 340                 // order of the names in locale::_S_categories.  We'd like to
 341                 // adjust the former (the latter is dictated by compatibility
 342                 // with glibc) but we can't for binary compatibility.
 343                 size_t __ix_name = __ix;
 344                 if (__ix == 2 || __ix == 3)
 345                   __ix_name = 5 - __ix;
 346
 347                 char* __src = __imp->_M_names[__ix_name] ?
 348                               __imp->_M_names[__ix_name] : __imp->_M_names[0];
 349                 const size_t __len = std::strlen(__src) + 1;
 350                 char* __new = new char[__len];
 351                 std::memcpy(__new, __src, __len);
 352                 delete [] _M_names[__ix_name];
 353                 _M_names[__ix_name] = __new;
 354               }
 355           }
 356       }
 357   }
 358
 359 _GLIBCXX_END_NAMESPACE_VERSION
 360 } // namespace