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function resu = df_check_char_array(x, nelem, required)
%# auxiliary function: pad a char array to some width
%% Copyright (C) 2009-2010 Pascal Dupuis <Pascal.Dupuis@uclouvain.be>
%%
%% 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 2, 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,
%% write to the Free Software Foundation, 59 Temple Place -
%% Suite 330, Boston, MA 02111-1307, USA.
%#
%# $Id: df_check_char_array.m 852 2010-07-22 10:47:55Z dupuis $
%#
if 2 == nargin, required = [nelem 1]; endif
if nelem < required(1),
error("Too many elements to assign");
endif
%# a zero-length element is still considered as a space by char
if isempty(x), x = ' '; endif
if size(x, 1) < max(required(1), nelem)
%# pad vertically
dummy = repmat(' ', nelem-size(x, 1), 1);
resu = char(x, dummy);
else
resu = x;
endif
if size(resu, 2) < required(2),
%# pad horizontally
dummy = repmat(' ', nelem, required(2)-size(resu, 2));
resu = horzcat(resu, dummy);
endif
endfunction