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more/io/fdstreambuf.h

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//  Copyright (C) 2000--2001  Petter Urkedal (petter.urkedal@matfys.lth.se)

//  This file is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.

//  This file is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.

//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

//  As a special exception, you may use this file as part of a free
//  software library without restriction.  Specifically, if other files
//  instantiate templates or use macros or inline functions from this
//  file, or you compile this file and link it with other files to
//  produce an executable, this file does not by itself cause the
//  resulting executable to be covered by the GNU General Public
//  License.  This exception does not however invalidate any other
//  reasons why the executable file might be covered by the GNU General
//  Public License.

//  $Id: fdstreambuf.h,v 1.1 2002/05/30 18:01:37 petter_urkedal Exp $


#ifndef MORE_BITS_FDSTREAMBUF_H
#define MORE_BITS_FDSTREAMBUF_H


#include <ios>
#include <iosfwd>
#include <streambuf>

//#define MORE_BITS_FDSTREAMBUF_INLINE_STORAGE 1

namespace more {
namespace io {

  ///\if bits
  namespace bits {

    template<typename CharT, typename Traits>
      struct basic_fdstreambuf
          : std::basic_streambuf<CharT, Traits>
      {
          typedef CharT char_type;
          typedef Traits traits_type;
          typedef typename Traits::int_type int_type;
          typedef typename Traits::pos_type pos_type;
          typedef typename Traits::off_type off_type;

          basic_fdstreambuf(int fd_in_ = -1, int fd_out_ = -1)
              : fd_in(fd_in_), fd_out(fd_out_) {
#ifdef MORE_BITS_FDSTREAMBUF_INLINE_STORAGE
              setg(buf_get, buf_get, buf_get);
              setp(buf_put, buf_put+nbuf_put);
#else
              setg(0, 0, 0);
              setp(0, 0);
#endif
          }
          virtual ~basic_fdstreambuf();

          void set_fd_in(int fd) { setg(eback(), eback(), eback()); fd_in = fd; }
          void set_fd_out(int fd) { sync(); fd_out = fd; }
          void set_fd_io(int fd) {
              setg(eback(), eback(), eback());
              sync();
              fd_in = fd_out = fd;
          }

        protected:
          virtual int sync();
          virtual int_type overflow(int_type = traits_type::eof());
          virtual int_type underflow();

        private:
          int fd_in, fd_out;
          static const int nbuf_put = 512;
          static const int nbuf_get = 512;
#ifdef MORE_BITS_FDSTREAMBUF_INLINE_STORAGE
          char buf_put[nbuf_put];
          char buf_get[nbuf_get];
#endif
      };

    typedef basic_fdstreambuf< char, std::char_traits<char> > fdstreambuf;
  }
  ///\endif

}
}

#endif

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