/*

Copyright (C) 1996-2020 The Octave Project Developers

See the file COPYRIGHT.md in the top-level directory of this distribution
or <https://octave.org/COPYRIGHT.html/>.


This file is part of Octave.

Octave 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 3 of the License, or
(at your option) any later version.

Octave 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 Octave; see the file COPYING.  If not, see
<https://www.gnu.org/licenses/>.

*/

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <istream>
#include <ostream>

#include "error.h"
#include "oct-iostrm.h"

// Position a stream at OFFSET relative to ORIGIN.

int
octave_base_iostream::seek (off_t, int)
{
  invalid_operation ();
  return -1;
}

// Return current stream position.

off_t
octave_base_iostream::tell (void)
{
  invalid_operation ();
  return -1;
}

// Return nonzero if EOF has been reached on this stream.

bool
octave_base_iostream::eof (void) const
{
  invalid_operation ();
  return false;
}

void
octave_base_iostream::invalid_operation (void) const
{
  // Note: use ::error to get error from error.h which halts operation.
  ::error ("%s: invalid operation", stream_type ());
}

// Return nonzero if EOF has been reached on this stream.

bool
octave_istream::eof (void) const
{
  return m_istream && m_istream->eof ();
}

octave::stream
octave_istream::create (std::istream *arg, const std::string& n)
{
  return octave::stream (new octave_istream (arg, n));
}

// Return nonzero if EOF has been reached on this stream.

bool
octave_ostream::eof (void) const
{
  return m_ostream && m_ostream->eof ();
}

octave::stream
octave_ostream::create (std::ostream *arg, const std::string& n)
{
  return octave::stream (new octave_ostream (arg, n));
}