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% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 16.1.4, p. II-267.
% Original source in file "fonts2.TEX", starting line 227.
\wlog{L: "ts-subst.tip" ["fonts2.TEX," l. 227, p. II-267]}%
% This file DOES belong to format "texip."
\InputD{substf.tip}
\InputD{newoutfr.tip}
\def\SubstituteFont #1#2#3#4{% 
    \expandafter\newifOF \csname if-\string#1\endcsname
    \csname if-\string#1true\endcsname
    \def#1{% 
        \csname if-\string#1\endcsname
            \message{%
                \string\SubstituteFont: No \string#2 font at
                size #3pt, using \noexpand\rm instead.%
            }%
            \global\csname if-\string#1false\endcsname
        \fi
        #4% 
    }%
}