codecvt.cc

00001 // Copyright (C) 2000, 2002 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 #ifdef _GLIBCPP_USE___ENC_TRAITS
00035   // Definitions for static const data members of __enc_traits.
00036   const int __enc_traits::_S_max_size;
00037 #endif 
00038 
00039   codecvt<char, char, mbstate_t>::
00040   codecvt(size_t __refs)
00041   : __codecvt_abstract_base<char, char, mbstate_t>(__refs)
00042   { }
00043 
00044   codecvt<char, char, mbstate_t>::
00045   ~codecvt() { }
00046   
00047   codecvt_base::result
00048   codecvt<char, char, mbstate_t>::
00049   do_out(state_type&, const intern_type* __from, 
00050      const intern_type* __from_end, const intern_type*& __from_next,
00051      extern_type* __to, extern_type* __to_end, 
00052      extern_type*& __to_next) const
00053   { 
00054     size_t __len = min(__from_end - __from, __to_end - __to);
00055     memcpy(__to, __from, __len);
00056     __from_next = __from; 
00057     __to_next = __to;
00058     return noconv;  
00059   }
00060   
00061   codecvt_base::result
00062   codecvt<char, char, mbstate_t>::
00063   do_unshift(state_type&, extern_type* __to,
00064              extern_type*, extern_type*& __to_next) const
00065   { 
00066     __to_next = __to; 
00067     return noconv; 
00068   }
00069   
00070   codecvt_base::result
00071   codecvt<char, char, mbstate_t>::
00072   do_in(state_type&, const extern_type* __from, 
00073     const extern_type* __from_end, const extern_type*& __from_next,
00074     intern_type* __to, intern_type* __to_end, 
00075     intern_type*& __to_next) const
00076   { 
00077     size_t __len = min(__from_end - __from, __to_end - __to);
00078     memcpy(__to, __from, __len);
00079     __from_next = __from; 
00080     __to_next = __to;
00081     return noconv;  
00082   }
00083 
00084   int 
00085   codecvt<char, char, mbstate_t>::
00086   do_encoding() const throw() 
00087   { return 1; }
00088   
00089   bool 
00090   codecvt<char, char, mbstate_t>::
00091   do_always_noconv() const throw() 
00092   { return true; }
00093   
00094   int 
00095   codecvt<char, char, mbstate_t>::
00096   do_length (const state_type&, const extern_type* __from,
00097          const extern_type* __end, size_t __max) const
00098   { return min(__max, static_cast<size_t>(__end - __from)); }
00099   
00100   int 
00101   codecvt<char, char, mbstate_t>::
00102   do_max_length() const throw() 
00103   { return 1; }
00104   
00105 #ifdef _GLIBCPP_USE_WCHAR_T
00106   // codecvt<wchar_t, char, mbstate_t> required specialization
00107   codecvt<wchar_t, char, mbstate_t>::
00108   codecvt(size_t __refs)
00109   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs) { }
00110 
00111   codecvt<wchar_t, char, mbstate_t>::
00112   ~codecvt() { }
00113   
00114   codecvt_base::result
00115   codecvt<wchar_t, char, mbstate_t>::
00116   do_out(state_type& __state, const intern_type* __from, 
00117      const intern_type* __from_end, const intern_type*& __from_next,
00118      extern_type* __to, extern_type* __to_end,
00119      extern_type*& __to_next) const
00120   {
00121     result __ret = error;
00122     size_t __len = min(__from_end - __from, __to_end - __to);
00123     size_t __conv = wcsrtombs(__to, &__from, __len, &__state);
00124 
00125     if (__conv == __len)
00126       {
00127     __from_next = __from;
00128     __to_next = __to + __conv;
00129     __ret = ok;
00130       }
00131     else if (__conv > 0 && __conv < __len)
00132       {
00133     __from_next = __from;
00134     __to_next = __to + __conv;
00135     __ret = partial;
00136       }
00137     else
00138       __ret = error;
00139     
00140     return __ret; 
00141   }
00142   
00143   codecvt_base::result
00144   codecvt<wchar_t, char, mbstate_t>::
00145   do_unshift(state_type&, extern_type* __to,
00146          extern_type*, extern_type*& __to_next) const
00147   {
00148     __to_next = __to;
00149     return noconv;
00150   }
00151   
00152   codecvt_base::result
00153   codecvt<wchar_t, char, mbstate_t>::
00154   do_in(state_type& __state, const extern_type* __from, 
00155     const extern_type* __from_end, const extern_type*& __from_next,
00156     intern_type* __to, intern_type* __to_end,
00157     intern_type*& __to_next) const
00158   {
00159     result __ret = error;
00160     size_t __len = min(__from_end - __from, __to_end - __to);
00161     size_t __conv = mbsrtowcs(__to, &__from, __len, &__state);
00162 
00163     if (__conv == __len)
00164       {
00165     __from_next = __from;
00166     __to_next = __to + __conv;
00167     __ret = ok;
00168       }
00169     else if (__conv > 0 && __conv < __len)
00170       {
00171     __from_next = __from;
00172     __to_next = __to + __conv;
00173     __ret = partial;
00174       }
00175     else
00176       __ret = error;
00177     
00178     return __ret; 
00179   }
00180   
00181   int 
00182   codecvt<wchar_t, char, mbstate_t>::
00183   do_encoding() const throw()
00184   { return sizeof(wchar_t); }
00185   
00186   bool 
00187   codecvt<wchar_t, char, mbstate_t>::
00188   do_always_noconv() const throw()
00189   { return false; }
00190   
00191   int 
00192   codecvt<wchar_t, char, mbstate_t>::
00193   do_length(const state_type&, const extern_type* __from,
00194         const extern_type* __end, size_t __max) const
00195   { return min(__max, static_cast<size_t>(__end - __from)); }
00196 
00197   int 
00198   codecvt<wchar_t, char, mbstate_t>::
00199   do_max_length() const throw()
00200   { return 1; }
00201 #endif //  _GLIBCPP_USE_WCHAR_T
00202 } // namespace std

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