Mercurial > octave
view scripts/io/is_valid_file_id.m @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
line wrap: on
line source
## Copyright (C) 2010-2020 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/>. ## -*- texinfo -*- ## @deftypefn {} {} is_valid_file_id (@var{fid}) ## Return true if @var{fid} refers to an open file. ## @seealso{freport, fopen} ## @end deftypefn function retval = is_valid_file_id (fid) retval = false; if (nargin == 1) try if (isscalar (fid)) [file, mode, arch] = fopen (fid); retval = ! isempty (file); endif end_try_catch else print_usage (); endif endfunction %!assert (is_valid_file_id (stdout)) %!assert (! is_valid_file_id ([1,2;3,4])) %!assert (! is_valid_file_id ("not_a_file_id")) %!assert (! is_valid_file_id (-1)) %!assert (! is_valid_file_id (pi))