stdio_filebuf.h

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00001 // File descriptor layer for filebuf -*- C++ -*-
00002 
00003 // Copyright (C) 2002 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00034 #ifndef _EXT_STDIO_FILEBUF
00035 #define _EXT_STDIO_FILEBUF
00036 
00037 #pragma GCC system_header
00038 #include <fstream>
00039 
00040 namespace __gnu_cxx
00041 {
00051   template<typename _CharT, typename _Traits = std::char_traits<_CharT> >
00052     class stdio_filebuf : public std::basic_filebuf<_CharT, _Traits>
00053     {
00054     public:
00055       // Types:
00056       typedef _CharT                                char_type;
00057       typedef _Traits                               traits_type;
00058       typedef typename traits_type::int_type        int_type;
00059       typedef typename traits_type::pos_type        pos_type;
00060       typedef typename traits_type::off_type        off_type;
00061       
00062     protected:
00063       // Stack-based buffer for unbuffered input.
00064       char_type         _M_unbuf[4];
00065       
00066     public:
00077       stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del, 
00078             int_type __size);
00079 
00090       stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode, 
00091             int_type __size = static_cast<int_type>(BUFSIZ));
00092 
00097       virtual
00098       ~stdio_filebuf();
00099 
00108       int
00109       fd()
00110       { return _M_file.fd(); }
00111     };
00112 
00113   template<typename _CharT, typename _Traits>
00114     stdio_filebuf<_CharT, _Traits>::~stdio_filebuf()
00115     { }
00116 
00117   template<typename _CharT, typename _Traits>
00118     stdio_filebuf<_CharT, _Traits>::
00119     stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del, 
00120           int_type __size)
00121     {
00122       _M_file.sys_open(__fd, __mode, __del);
00123       if (this->is_open())
00124     {
00125       _M_mode = __mode;
00126       if (__size > 0 && __size < 4)
00127         {
00128           // Specify unbuffered.
00129           _M_buf = _M_unbuf;
00130           _M_buf_size = __size;
00131           _M_buf_size_opt = 0;
00132         }
00133       else
00134         {
00135           _M_buf_size_opt = __size;
00136           _M_allocate_internal_buffer();
00137         }
00138       _M_set_indeterminate();
00139     }
00140     }
00141 
00142   template<typename _CharT, typename _Traits>
00143     stdio_filebuf<_CharT, _Traits>::
00144     stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode, 
00145           int_type __size)
00146     {
00147       _M_file.sys_open(__f, __mode);
00148       if (this->is_open())
00149     {
00150       _M_mode = __mode;
00151       if (__size > 0 && __size < 4)
00152         {
00153           // Specify unbuffered.
00154           _M_buf = _M_unbuf;
00155           _M_buf_size = __size;
00156           _M_buf_size_opt = 0;
00157         }
00158       else
00159         {
00160           _M_buf_size_opt = __size;
00161           _M_allocate_internal_buffer();
00162         }
00163       _M_set_indeterminate();
00164     }
00165     }
00166 } // namespace __gnu_cxx
00167 
00168 #endif /* _EXT_STDIO_FILEBUF */

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