libstdc++-v3/src/codecvt.cc

   1 // Copyright (C) 2000, 2002, 2004 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 2, 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 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING.  If not, write to the Free
  16 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // As a special exception, you may use this file as part of a free software
  20 // library without restriction.  Specifically, if other files instantiate
  21 // templates or use macros or inline functions from this file, or you compile
  22 // this file and link it with other files to produce an executable, this
  23 // file does not by itself cause the resulting executable to be covered by
  24 // the GNU General Public License.  This exception does not however
  25 // invalidate any other reasons why the executable file might be covered by
  26 // the GNU General Public License.
  27
  28 // Written by Benjamin Kosnik <bkoz@cygnus.com>
  29
  30 #include <locale>
  31
  32 namespace std
  33 {
  34   // Definitions for locale::id of standard facets that are specialized.
  35  locale::id codecvt<char, char, mbstate_t>::id;
  36
  37 #ifdef _GLIBCXX_USE_WCHAR_T
  38   locale::id codecvt<wchar_t, char, mbstate_t>::id;
  39 #endif
  40
  41 #ifdef _GLIBCXX_USE___ENC_TRAITS
  42   // Definitions for static const data members of __enc_traits.
  43   const int __enc_traits::_S_max_size;
  44 #endif
  45
  46   codecvt<char, char, mbstate_t>::
  47   codecvt(size_t __refs)
  48   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
  49   _M_c_locale_codecvt(_S_get_c_locale())
  50   { }
  51
  52   codecvt<char, char, mbstate_t>::
  53   codecvt(__c_locale __cloc, size_t __refs)
  54   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
  55   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
  56   { }
  57
  58   codecvt<char, char, mbstate_t>::
  59   ~codecvt()
  60   { _S_destroy_c_locale(_M_c_locale_codecvt); }
  61
  62   codecvt_base::result
  63   codecvt<char, char, mbstate_t>::
  64   do_out(state_type&, const intern_type* __from,
  65          const intern_type*, const intern_type*& __from_next,
  66          extern_type* __to, extern_type*,
  67          extern_type*& __to_next) const
  68   {
  69     // _GLIBCXX_RESOLVE_LIB_DEFECTS
  70     // According to the resolution of DR19, "If returns noconv [...]
  71     // there are no changes to the values in [to, to_limit)."
  72     __from_next = __from;
  73     __to_next = __to;
  74     return noconv;
  75   }
  76
  77   codecvt_base::result
  78   codecvt<char, char, mbstate_t>::
  79   do_unshift(state_type&, extern_type* __to,
  80              extern_type*, extern_type*& __to_next) const
  81   {
  82     __to_next = __to;
  83     return noconv;
  84   }
  85
  86   codecvt_base::result
  87   codecvt<char, char, mbstate_t>::
  88   do_in(state_type&, const extern_type* __from,
  89         const extern_type*, const extern_type*& __from_next,
  90         intern_type* __to, intern_type*, intern_type*& __to_next) const
  91   {
  92     // _GLIBCXX_RESOLVE_LIB_DEFECTS
  93     // According to the resolution of DR19, "If returns noconv [...]
  94     // there are no changes to the values in [to, to_limit)."
  95     __from_next = __from;
  96     __to_next = __to;
  97     return noconv;
  98   }
  99
 100   int
 101   codecvt<char, char, mbstate_t>::
 102   do_encoding() const throw()
 103   { return 1; }
 104
 105   bool
 106   codecvt<char, char, mbstate_t>::
 107   do_always_noconv() const throw()
 108   { return true; }
 109
 110   int
 111   codecvt<char, char, mbstate_t>::
 112   do_length (state_type&, const extern_type* __from,
 113              const extern_type* __end, size_t __max) const
 114   {
 115     size_t __d = static_cast<size_t>(__end - __from);
 116     return std::min(__max, __d);
 117   }
 118
 119   int
 120   codecvt<char, char, mbstate_t>::
 121   do_max_length() const throw()
 122   { return 1; }
 123
 124 #ifdef _GLIBCXX_USE_WCHAR_T
 125   // codecvt<wchar_t, char, mbstate_t> required specialization
 126   codecvt<wchar_t, char, mbstate_t>::
 127   codecvt(size_t __refs)
 128   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
 129   _M_c_locale_codecvt(_S_get_c_locale())
 130   { }
 131
 132   codecvt<wchar_t, char, mbstate_t>::
 133   codecvt(__c_locale __cloc, size_t __refs)
 134   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
 135   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
 136   { }
 137
 138   codecvt<wchar_t, char, mbstate_t>::
 139   ~codecvt()
 140   { _S_destroy_c_locale(_M_c_locale_codecvt); }
 141
 142   codecvt_base::result
 143   codecvt<wchar_t, char, mbstate_t>::
 144   do_unshift(state_type&, extern_type* __to,
 145              extern_type*, extern_type*& __to_next) const
 146   {
 147     // XXX Probably wrong for stateful encodings
 148     __to_next = __to;
 149     return noconv;
 150   }
 151
 152   bool
 153   codecvt<wchar_t, char, mbstate_t>::
 154   do_always_noconv() const throw()
 155   { return false; }
 156 #endif //  _GLIBCXX_USE_WCHAR_T
 157 } // namespace std