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## Copyright (C) 2003-2015 John W. Eaton
##
## 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
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{dir} =} tempdir ()
## Return the name of the host system's directory for temporary files.
##
## The directory name is taken first from the environment variable
## @env{TMPDIR}. If that does not exist the system default returned by
## @code{P_tmpdir} is used.
## @seealso{P_tmpdir, tempname, mkstemp, tmpfile}
## @end deftypefn
function dirname = tempdir ()
dirname = getenv ("TMPDIR");
if (isempty (dirname))
dirname = P_tmpdir;
endif
if (! strcmp (dirname(end), filesep))
dirname = [dirname filesep];
endif
if (! isdir (dirname))
warning ("tempdir: '%s' does not exist or is not a directory", dirname);
endif
endfunction
%!assert (ischar (tempdir ()))
%!test
%! old_wstate = warning ("query");
%! warning ("off");
%! old_tmpdir = getenv ("TMPDIR");
%! unwind_protect
%! setenv ("TMPDIR", "__MY_TMP_DIR__");
%! assert (tempdir (), ["__MY_TMP_DIR__" filesep()]);
%! unwind_protect_cleanup
%! if (! isempty (old_tmpdir))
%! setenv ("TMPDIR", old_tmpdir);
%! else
%! unsetenv ("TMPDIR");
%! endif
%! warning (old_wstate);
%! end_unwind_protect
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