# 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       typedef std::size_t                               size_t;
    00062
    00063     protected:
    00064       // Stack-based buffer for unbuffered input.
    00065       char_type         _M_unbuf[4];
    00066
    00067     public:
    00078       stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del,
    00079             size_t __size);
    00080
    00091       stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
    00092             size_t __size = static_cast<size_t>(BUFSIZ));
    00093
    00098       virtual
    00099       ~stdio_filebuf();
    00100
    00109       int
    00110       fd()
    00111       { return _M_file.fd(); }
    00112     };
    00113
    00114   template<typename _CharT, typename _Traits>
    00115     stdio_filebuf<_CharT, _Traits>::~stdio_filebuf()
    00116     { }
    00117
    00118   template<typename _CharT, typename _Traits>
    00119     stdio_filebuf<_CharT, _Traits>::
    00120     stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del,
    00121           size_t __size)
    00122     {
    00123       _M_file.sys_open(__fd, __mode, __del);
    00124       if (this->is_open())
    00125     {
    00126       _M_mode = __mode;
    00127       if (__size > 0 && __size < 4)
    00128         {
    00129           // Specify not to use an allocated buffer.
    00130           _M_buf = _M_unbuf;
    00131           _M_buf_size = __size;
    00132           _M_buf_size_opt = 0;
    00133         }
    00134       else
    00135         {
    00136           _M_buf_size_opt = __size;
    00137           _M_allocate_internal_buffer();
    00138         }
    00139       _M_set_indeterminate();
    00140     }
    00141     }
    00142
    00143   template<typename _CharT, typename _Traits>
    00144     stdio_filebuf<_CharT, _Traits>::
    00145     stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
    00146           size_t __size)
    00147     {
    00148       _M_file.sys_open(__f, __mode);
    00149       if (this->is_open())
    00150     {
    00151       _M_mode = __mode;
    00152       if (__size > 0 && __size < 4)
    00153         {
    00154           // Specify not to use an allocated buffer.
    00155           _M_buf = _M_unbuf;
    00156           _M_buf_size = __size;
    00157           _M_buf_size_opt = 0;
    00158         }
    00159       else
    00160         {
    00161           _M_buf_size_opt = __size;
    00162           _M_allocate_internal_buffer();
    00163         }
    00164       _M_set_indeterminate();
    00165     }
    00166     }
    00167 } // namespace __gnu_cxx
    00168
    00169 #endif /* _EXT_STDIO_FILEBUF */