function s = strncmp(s1,s2,n)
%STRNCMP Compare first N characters of strings for OPAQUE objects.

%   Copyright 1984-2000 The MathWorks, Inc. 
%   $Revision: 1.1 $ $Date: 2000/06/16 19:10:24 $

s = strncmp(fromOpaque(s1),fromOpaque(s2),fromOpaque(n));

function z = fromOpaque(x)
z=x;

if isjava(z)
  z = char(z);
end

if isa(z,'opaque')
 error(sprintf('Conversion to char from %s is not possible.', class(x)));
end

