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

   1 // Copyright (C) 2000-2017 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 namespace std _GLIBCXX_VISIBILITY(default)
  28 {
  29 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  30
  31   // Definitions for locale::id of standard facets that are specialized.
  32  locale::id codecvt<char, char, mbstate_t>::id;
  33
  34 #ifdef _GLIBCXX_USE_WCHAR_T
  35   locale::id codecvt<wchar_t, char, mbstate_t>::id;
  36 #endif
  37
  38   codecvt<char, char, mbstate_t>::
  39   codecvt(size_t __refs)
  40   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
  41   _M_c_locale_codecvt(_S_get_c_locale())
  42   { }
  43
  44   codecvt<char, char, mbstate_t>::
  45   codecvt(__c_locale __cloc, size_t __refs)
  46   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
  47   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
  48   { }
  49
  50   codecvt<char, char, mbstate_t>::
  51   ~codecvt()
  52   { _S_destroy_c_locale(_M_c_locale_codecvt); }
  53
  54   codecvt_base::result
  55   codecvt<char, char, mbstate_t>::
  56   do_out(state_type&, const intern_type* __from,
  57          const intern_type*, const intern_type*& __from_next,
  58          extern_type* __to, extern_type*,
  59          extern_type*& __to_next) const
  60   {
  61     // _GLIBCXX_RESOLVE_LIB_DEFECTS
  62     // According to the resolution of DR19, "If returns noconv [...]
  63     // there are no changes to the values in [to, to_limit)."
  64     __from_next = __from;
  65     __to_next = __to;
  66     return noconv;
  67   }
  68
  69   codecvt_base::result
  70   codecvt<char, char, mbstate_t>::
  71   do_unshift(state_type&, extern_type* __to,
  72              extern_type*, extern_type*& __to_next) const
  73   {
  74     __to_next = __to;
  75     return noconv;
  76   }
  77
  78   codecvt_base::result
  79   codecvt<char, char, mbstate_t>::
  80   do_in(state_type&, const extern_type* __from,
  81         const extern_type*, const extern_type*& __from_next,
  82         intern_type* __to, intern_type*, intern_type*& __to_next) const
  83   {
  84     // _GLIBCXX_RESOLVE_LIB_DEFECTS
  85     // According to the resolution of DR19, "If returns noconv [...]
  86     // there are no changes to the values in [to, to_limit)."
  87     __from_next = __from;
  88     __to_next = __to;
  89     return noconv;
  90   }
  91
  92   int
  93   codecvt<char, char, mbstate_t>::
  94   do_encoding() const throw()
  95   { return 1; }
  96
  97   bool
  98   codecvt<char, char, mbstate_t>::
  99   do_always_noconv() const throw()
 100   { return true; }
 101
 102   int
 103   codecvt<char, char, mbstate_t>::
 104   do_length (state_type&, const extern_type* __from,
 105              const extern_type* __end, size_t __max) const
 106   {
 107     size_t __d = static_cast<size_t>(__end - __from);
 108     return std::min(__max, __d);
 109   }
 110
 111   int
 112   codecvt<char, char, mbstate_t>::
 113   do_max_length() const throw()
 114   { return 1; }
 115
 116 #ifdef _GLIBCXX_USE_WCHAR_T
 117   // codecvt<wchar_t, char, mbstate_t> required specialization
 118   codecvt<wchar_t, char, mbstate_t>::
 119   codecvt(size_t __refs)
 120   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
 121   _M_c_locale_codecvt(_S_get_c_locale())
 122   { }
 123
 124   codecvt<wchar_t, char, mbstate_t>::
 125   codecvt(__c_locale __cloc, size_t __refs)
 126   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
 127   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
 128   { }
 129
 130   codecvt<wchar_t, char, mbstate_t>::
 131   ~codecvt()
 132   { _S_destroy_c_locale(_M_c_locale_codecvt); }
 133
 134   codecvt_base::result
 135   codecvt<wchar_t, char, mbstate_t>::
 136   do_unshift(state_type&, extern_type* __to,
 137              extern_type*, extern_type*& __to_next) const
 138   {
 139     // XXX Probably wrong for stateful encodings
 140     __to_next = __to;
 141     return noconv;
 142   }
 143
 144   bool
 145   codecvt<wchar_t, char, mbstate_t>::
 146   do_always_noconv() const throw()
 147   { return false; }
 148 #endif //  _GLIBCXX_USE_WCHAR_T
 149
 150 _GLIBCXX_END_NAMESPACE_VERSION
 151 } // namespace