codecvt.cc

00001 // Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
00002 //
00003 // This file is part of the GNU ISO C++ Library.  This library is free
00004 // software; you can redistribute it and/or modify it under the
00005 // terms of the GNU General Public License as published by the
00006 // Free Software Foundation; either version 2, or (at your option)
00007 // any later version.
00008 
00009 // This library is distributed in the hope that it will be useful,
00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 // GNU General Public License for more details.
00013 
00014 // You should have received a copy of the GNU General Public License along
00015 // with this library; see the file COPYING.  If not, write to the Free
00016 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00017 // USA.
00018 
00019 // As a special exception, you may use this file as part of a free software
00020 // library without restriction.  Specifically, if other files instantiate
00021 // templates or use macros or inline functions from this file, or you compile
00022 // this file and link it with other files to produce an executable, this
00023 // file does not by itself cause the resulting executable to be covered by
00024 // the GNU General Public License.  This exception does not however
00025 // invalidate any other reasons why the executable file might be covered by
00026 // the GNU General Public License.
00027 
00028 // Written by Benjamin Kosnik <bkoz@cygnus.com>
00029 
00030 #include <locale>
00031 
00032 namespace std 
00033 {
00034   // Definitions for locale::id of standard facets that are specialized.
00035  locale::id codecvt<char, char, mbstate_t>::id;
00036 
00037 #ifdef _GLIBCPP_USE_WCHAR_T  
00038   locale::id codecvt<wchar_t, char, mbstate_t>::id;
00039 #endif
00040 
00041 #ifdef _GLIBCPP_USE___ENC_TRAITS
00042   // Definitions for static const data members of __enc_traits.
00043   const int __enc_traits::_S_max_size;
00044 #endif 
00045 
00046   codecvt<char, char, mbstate_t>::
00047   codecvt(size_t __refs)
00048   : __codecvt_abstract_base<char, char, mbstate_t>(__refs)
00049   { }
00050 
00051   codecvt<char, char, mbstate_t>::
00052   ~codecvt()
00053   { }
00054   
00055   codecvt_base::result
00056   codecvt<char, char, mbstate_t>::
00057   do_out(state_type&, const intern_type* __from, 
00058      const intern_type*, const intern_type*& __from_next,
00059      extern_type* __to, extern_type*, 
00060      extern_type*& __to_next) const
00061   { 
00062     // _GLIBCPP_RESOLVE_LIB_DEFECTS
00063     // According to the resolution of DR19, "If returns noconv [...]
00064     // there are no changes to the values in [to, to_limit)."
00065     __from_next = __from; 
00066     __to_next = __to;
00067     return noconv;  
00068   }
00069   
00070   codecvt_base::result
00071   codecvt<char, char, mbstate_t>::
00072   do_unshift(state_type&, extern_type* __to,
00073              extern_type*, extern_type*& __to_next) const
00074   { 
00075     __to_next = __to; 
00076     return noconv; 
00077   }
00078   
00079   codecvt_base::result
00080   codecvt<char, char, mbstate_t>::
00081   do_in(state_type&, const extern_type* __from, 
00082     const extern_type*, const extern_type*& __from_next,
00083     intern_type* __to, intern_type*, 
00084     intern_type*& __to_next) const
00085   {
00086     // _GLIBCPP_RESOLVE_LIB_DEFECTS
00087     // According to the resolution of DR19, "If returns noconv [...]
00088     // there are no changes to the values in [to, to_limit)."
00089     __from_next = __from; 
00090     __to_next = __to;
00091     return noconv;  
00092   }
00093 
00094   int 
00095   codecvt<char, char, mbstate_t>::
00096   do_encoding() const throw() 
00097   { return 1; }
00098   
00099   bool 
00100   codecvt<char, char, mbstate_t>::
00101   do_always_noconv() const throw() 
00102   { return true; }
00103   
00104   int 
00105   codecvt<char, char, mbstate_t>::
00106   do_length (const state_type&, const extern_type* __from,
00107          const extern_type* __end, size_t __max) const
00108   { return min(__max, static_cast<size_t>(__end - __from)); }
00109   
00110   int 
00111   codecvt<char, char, mbstate_t>::
00112   do_max_length() const throw() 
00113   { return 1; }
00114   
00115 #ifdef _GLIBCPP_USE_WCHAR_T
00116   // codecvt<wchar_t, char, mbstate_t> required specialization
00117   codecvt<wchar_t, char, mbstate_t>::
00118   codecvt(size_t __refs)
00119   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs)
00120   { }
00121 
00122   codecvt<wchar_t, char, mbstate_t>::
00123   ~codecvt()
00124   { }
00125   
00126   codecvt_base::result
00127   codecvt<wchar_t, char, mbstate_t>::
00128   do_unshift(state_type&, extern_type* __to,
00129          extern_type*, extern_type*& __to_next) const
00130   {
00131     __to_next = __to;
00132     return noconv;
00133   }
00134   
00135   int 
00136   codecvt<wchar_t, char, mbstate_t>::
00137   do_encoding() const throw()
00138   { return sizeof(wchar_t); }
00139   
00140   bool 
00141   codecvt<wchar_t, char, mbstate_t>::
00142   do_always_noconv() const throw()
00143   { return false; }
00144   
00145   int 
00146   codecvt<wchar_t, char, mbstate_t>::
00147   do_length(const state_type&, const extern_type* __from,
00148         const extern_type* __end, size_t __max) const
00149   { return min(__max, static_cast<size_t>(__end - __from)); }
00150 
00151   int 
00152   codecvt<wchar_t, char, mbstate_t>::
00153   do_max_length() const throw()
00154   { return 1; }
00155 #endif //  _GLIBCPP_USE_WCHAR_T
00156 } // namespace std

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