/usr/share/octave/packages/io-2.4.10/tidyxml.m is in octave-io 2.4.10-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## This program 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.
##
## This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {} {@var{ostr} =} tidyxml (@var{istr}, @var{conv_fcn})
## Optionally convert character using the function handle in @var{conv_fcn},
## remove characters (<32 >255) from text string or cell array @var{istr}
## and return the result in @var{ostr}.
##
## tidyxml is useful for converting strings in XML that have been partly
## or wholly encoded as double-byte characters. Such strings occur when
## dealing with a.o., spreadsheet programs reading/writing from/to
## XML-based formats and cannot be processed by Octave as Octave doesn't
## support unicode. For (optionally: nested) nested cell arrays tidyxml
## is called recursively and only processes cells containing text strings.
## @end deftypefn
## Author: Philip Nienhuis <prnienhuis@users.sf.net>
## Created: 2016-01-13
function [ostr] = tidyxml (istr="", conv_fcn=[])
if (iscell (istr))
idx = find (cellfun (@ischar, istr));
ostr = istr;
ostr(idx) = cellfun (@(instr) tidyxml (instr, conv_fcn), istr(idx), "uni", 0);
elseif (! ischar (istr))
print_usage ();
elseif (isempty (istr))
ostr = "";
else
if (isempty (conv_fcn))
ustr = uint8 (istr);
else
if (nargout (conv_fcn) > 1)
[ustr, error_flag] = conv_fcn (istr);
if (error_flag)
warning ("Encoding conversion failed; some characters might be lost");
endif
else
try
ustr = conv_fcn (istr);
catch err
warning ("Encoding conversion failed; some characters might be lost");
ustr = istr;
end_try_catch
endif
endif
ostr = char (ustr(ustr > 31 & ustr < 256));
endif
endfunction
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