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diff --git a/octave_packages/m/miscellaneous/tempdir.m b/octave_packages/m/miscellaneous/tempdir.m
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+++ b/octave_packages/m/miscellaneous/tempdir.m
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+## Copyright (C) 2003-2012 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 system's directory for temporary files.
+## @end deftypefn
+
+function dirname = tempdir ()
+
+  dirname = getenv ("TMPDIR");
+  if (isempty (dirname))
+    dirname = P_tmpdir;
+  endif
+
+  if (! strcmp (dirname(end), filesep))
+    dirname = cstrcat (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
+%!   setenv ("TMPDIR", old_tmpdir);
+%!   warning (old_wstate);
+%! end_unwind_protect
+