////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2023 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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 <cerrno>
#include <cstdlib>
#include <cstring>

#include <list>
#include <string>

#include "dirent-wrappers.h"

#include "dir-ops.h"
#include "file-ops.h"
#include "lo-error.h"
#include "lo-sysdep.h"
#include "str-vec.h"

OCTAVE_BEGIN_NAMESPACE(octave)

OCTAVE_BEGIN_NAMESPACE(sys)

bool
dir_entry::open (const std::string& n)
{
  if (! n.empty ())
    m_name = n;

  if (! m_name.empty ())
    {
      close ();

      std::string fullname = sys::file_ops::tilde_expand (m_name);

      m_dir = octave_opendir_wrapper (fullname.c_str ());

      if (! m_dir)
        m_errmsg = std::strerror (errno);
    }
  else
    m_errmsg = "dir_entry::open: empty filename";

  return m_dir != nullptr;
}

string_vector
dir_entry::read ()
{
  string_vector retval;

  if (ok ())
    {
      std::list<std::string> dirlist;

      char *fname;

      while ((fname = octave_readdir_wrapper (m_dir)))
        dirlist.push_back (fname);

      retval = string_vector (dirlist);
    }

  return retval;
}

bool
dir_entry::close ()
{
  bool retval = true;

  if (m_dir)
    {
      retval = (octave_closedir_wrapper (m_dir) == 0);

      m_dir = nullptr;
    }

  return retval;
}

unsigned int
dir_entry::max_name_length ()
{
  return octave_name_max_wrapper ();
}

OCTAVE_END_NAMESPACE(sys)
OCTAVE_END_NAMESPACE(octave)