libstdc++-v3/src/codecvt.cc

   1 // Copyright (C) 2000, 2002, 2004, 2005, 2009 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 // Written by Benjamin Kosnik <bkoz@redhat.com>
  24
  25 #include <locale>
  26
  27 _GLIBCXX_BEGIN_NAMESPACE(std)
  28
  29   // Definitions for locale::id of standard facets that are specialized.
  30  locale::id codecvt<char, char, mbstate_t>::id;
  31
  32 #ifdef _GLIBCXX_USE_WCHAR_T
  33   locale::id codecvt<wchar_t, char, mbstate_t>::id;
  34 #endif
  35
  36   codecvt<char, char, mbstate_t>::
  37   codecvt(size_t __refs)
  38   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
  39   _M_c_locale_codecvt(_S_get_c_locale())
  40   { }
  41
  42   codecvt<char, char, mbstate_t>::
  43   codecvt(__c_locale __cloc, size_t __refs)
  44   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
  45   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
  46   { }
  47
  48   codecvt<char, char, mbstate_t>::
  49   ~codecvt()
  50   { _S_destroy_c_locale(_M_c_locale_codecvt); }
  51
  52   codecvt_base::result
  53   codecvt<char, char, mbstate_t>::
  54   do_out(state_type&, const intern_type* __from,
  55          const intern_type*, const intern_type*& __from_next,
  56          extern_type* __to, extern_type*,
  57          extern_type*& __to_next) const
  58   {
  59     // _GLIBCXX_RESOLVE_LIB_DEFECTS
  60     // According to the resolution of DR19, "If returns noconv [...]
  61     // there are no changes to the values in [to, to_limit)."
  62     __from_next = __from;
  63     __to_next = __to;
  64     return noconv;
  65   }
  66
  67   codecvt_base::result
  68   codecvt<char, char, mbstate_t>::
  69   do_unshift(state_type&, extern_type* __to,
  70              extern_type*, extern_type*& __to_next) const
  71   {
  72     __to_next = __to;
  73     return noconv;
  74   }
  75
  76   codecvt_base::result
  77   codecvt<char, char, mbstate_t>::
  78   do_in(state_type&, const extern_type* __from,
  79         const extern_type*, const extern_type*& __from_next,
  80         intern_type* __to, intern_type*, intern_type*& __to_next) const
  81   {
  82     // _GLIBCXX_RESOLVE_LIB_DEFECTS
  83     // According to the resolution of DR19, "If returns noconv [...]
  84     // there are no changes to the values in [to, to_limit)."
  85     __from_next = __from;
  86     __to_next = __to;
  87     return noconv;
  88   }
  89
  90   int
  91   codecvt<char, char, mbstate_t>::
  92   do_encoding() const throw()
  93   { return 1; }
  94
  95   bool
  96   codecvt<char, char, mbstate_t>::
  97   do_always_noconv() const throw()
  98   { return true; }
  99
 100   int
 101   codecvt<char, char, mbstate_t>::
 102   do_length (state_type&, const extern_type* __from,
 103              const extern_type* __end, size_t __max) const
 104   {
 105     size_t __d = static_cast<size_t>(__end - __from);
 106     return std::min(__max, __d);
 107   }
 108
 109   int
 110   codecvt<char, char, mbstate_t>::
 111   do_max_length() const throw()
 112   { return 1; }
 113
 114 #ifdef _GLIBCXX_USE_WCHAR_T
 115   // codecvt<wchar_t, char, mbstate_t> required specialization
 116   codecvt<wchar_t, char, mbstate_t>::
 117   codecvt(size_t __refs)
 118   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
 119   _M_c_locale_codecvt(_S_get_c_locale())
 120   { }
 121
 122   codecvt<wchar_t, char, mbstate_t>::
 123   codecvt(__c_locale __cloc, size_t __refs)
 124   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
 125   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
 126   { }
 127
 128   codecvt<wchar_t, char, mbstate_t>::
 129   ~codecvt()
 130   { _S_destroy_c_locale(_M_c_locale_codecvt); }
 131
 132   codecvt_base::result
 133   codecvt<wchar_t, char, mbstate_t>::
 134   do_unshift(state_type&, extern_type* __to,
 135              extern_type*, extern_type*& __to_next) const
 136   {
 137     // XXX Probably wrong for stateful encodings
 138     __to_next = __to;
 139     return noconv;
 140   }
 141
 142   bool
 143   codecvt<wchar_t, char, mbstate_t>::
 144   do_always_noconv() const throw()
 145   { return false; }
 146 #endif //  _GLIBCXX_USE_WCHAR_T
 147
 148 _GLIBCXX_END_NAMESPACE