libstdc++-v3/src/codecvt.cc

   1 // Copyright (C) 2000, 2002, 2004, 2005 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@redhat.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   codecvt<char, char, mbstate_t>::
  42   codecvt(size_t __refs)
  43   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
  44   _M_c_locale_codecvt(_S_get_c_locale())
  45   { }
  46
  47   codecvt<char, char, mbstate_t>::
  48   codecvt(__c_locale __cloc, size_t __refs)
  49   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
  50   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
  51   { }
  52
  53   codecvt<char, char, mbstate_t>::
  54   ~codecvt()
  55   { _S_destroy_c_locale(_M_c_locale_codecvt); }
  56
  57   codecvt_base::result
  58   codecvt<char, char, mbstate_t>::
  59   do_out(state_type&, const intern_type* __from,
  60          const intern_type*, const intern_type*& __from_next,
  61          extern_type* __to, extern_type*,
  62          extern_type*& __to_next) const
  63   {
  64     // _GLIBCXX_RESOLVE_LIB_DEFECTS
  65     // According to the resolution of DR19, "If returns noconv [...]
  66     // there are no changes to the values in [to, to_limit)."
  67     __from_next = __from;
  68     __to_next = __to;
  69     return noconv;
  70   }
  71
  72   codecvt_base::result
  73   codecvt<char, char, mbstate_t>::
  74   do_unshift(state_type&, extern_type* __to,
  75              extern_type*, extern_type*& __to_next) const
  76   {
  77     __to_next = __to;
  78     return noconv;
  79   }
  80
  81   codecvt_base::result
  82   codecvt<char, char, mbstate_t>::
  83   do_in(state_type&, const extern_type* __from,
  84         const extern_type*, const extern_type*& __from_next,
  85         intern_type* __to, intern_type*, intern_type*& __to_next) const
  86   {
  87     // _GLIBCXX_RESOLVE_LIB_DEFECTS
  88     // According to the resolution of DR19, "If returns noconv [...]
  89     // there are no changes to the values in [to, to_limit)."
  90     __from_next = __from;
  91     __to_next = __to;
  92     return noconv;
  93   }
  94
  95   int
  96   codecvt<char, char, mbstate_t>::
  97   do_encoding() const throw()
  98   { return 1; }
  99
 100   bool
 101   codecvt<char, char, mbstate_t>::
 102   do_always_noconv() const throw()
 103   { return true; }
 104
 105   int
 106   codecvt<char, char, mbstate_t>::
 107   do_length (state_type&, const extern_type* __from,
 108              const extern_type* __end, size_t __max) const
 109   {
 110     size_t __d = static_cast<size_t>(__end - __from);
 111     return std::min(__max, __d);
 112   }
 113
 114   int
 115   codecvt<char, char, mbstate_t>::
 116   do_max_length() const throw()
 117   { return 1; }
 118
 119 #ifdef _GLIBCXX_USE_WCHAR_T
 120   // codecvt<wchar_t, char, mbstate_t> required specialization
 121   codecvt<wchar_t, char, mbstate_t>::
 122   codecvt(size_t __refs)
 123   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
 124   _M_c_locale_codecvt(_S_get_c_locale())
 125   { }
 126
 127   codecvt<wchar_t, char, mbstate_t>::
 128   codecvt(__c_locale __cloc, size_t __refs)
 129   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
 130   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
 131   { }
 132
 133   codecvt<wchar_t, char, mbstate_t>::
 134   ~codecvt()
 135   { _S_destroy_c_locale(_M_c_locale_codecvt); }
 136
 137   codecvt_base::result
 138   codecvt<wchar_t, char, mbstate_t>::
 139   do_unshift(state_type&, extern_type* __to,
 140              extern_type*, extern_type*& __to_next) const
 141   {
 142     // XXX Probably wrong for stateful encodings
 143     __to_next = __to;
 144     return noconv;
 145   }
 146
 147   bool
 148   codecvt<wchar_t, char, mbstate_t>::
 149   do_always_noconv() const throw()
 150   { return false; }
 151 #endif //  _GLIBCXX_USE_WCHAR_T
 152 } // namespace std