# stdio_filebuf.h

    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
    00030 #include <fstream>
    00031
    00032 namespace __gnu_cxx
    00033 {
    00034   template<typename _CharT, typename _Traits = std::char_traits<_CharT> >
    00035     class stdio_filebuf : public std::basic_filebuf<_CharT, _Traits>
    00036     {
    00037     public:
    00038       // Types:
    00039       typedef _CharT                                char_type;
    00040       typedef _Traits                               traits_type;
    00041       typedef typename traits_type::int_type        int_type;
    00042       typedef typename traits_type::pos_type        pos_type;
    00043       typedef typename traits_type::off_type        off_type;
    00044
    00045     protected:
    00046       // Stack-based buffer for unbuffered input.
    00047       char_type         _M_unbuf[4];
    00048
    00049     public:
    00050       stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del,
    00051             int_type __size);
    00052
    00053       stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
    00054             int_type __size = static_cast<int_type>(BUFSIZ));
    00055
    00056       virtual
    00057       ~stdio_filebuf();
    00058
    00059       int
    00060       fd()
    00061       { return _M_file.fd(); }
    00062     };
    00063
    00064   template<typename _CharT, typename _Traits>
    00065     stdio_filebuf<_CharT, _Traits>::~stdio_filebuf()
    00066     { }
    00067
    00068   template<typename _CharT, typename _Traits>
    00069     stdio_filebuf<_CharT, _Traits>::
    00070     stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del,
    00071           int_type __size)
    00072     {
    00073       _M_file.sys_open(__fd, __mode, __del);
    00074       if (this->is_open())
    00075     {
    00076       _M_mode = __mode;
    00077       _M_buf_size_opt = __size;
    00078
    00079       if (__size > 0 && __size < 4)
    00080         {
    00081           _M_buf = _M_unbuf;
    00082           _M_buf_size = __size;
    00083         }
    00084       else
    00085         _M_allocate_internal_buffer();
    00086
    00087       _M_set_indeterminate();
    00088     }
    00089     }
    00090
    00091   template<typename _CharT, typename _Traits>
    00092     stdio_filebuf<_CharT, _Traits>::
    00093     stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
    00094           int_type __size)
    00095     {
    00096       _M_file.sys_open(__f, __mode);
    00097       if (this->is_open())
    00098     {
    00099       _M_mode = __mode;
    00100       _M_buf_size_opt = __size;
    00101
    00102       if (__size > 0 && __size < 4)
    00103         {
    00104           _M_buf = _M_unbuf;
    00105           _M_buf_size = __size;
    00106         }
    00107       else
    00108         _M_allocate_internal_buffer();
    00109
    00110       _M_set_indeterminate();
    00111     }
    00112     }
    00113 } // namespace __gnu_cxx