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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 24.1.18.3, p. III-305.
% Original source in file "macros4.TEX", starting line 1230.
\wlog{L: "droppre.tip" ["macros4.TEX," l. 1230, p. III-305]}%
% This file DOES belong to format "texip."
\InputD{isprefix.tip}
\InputD{showx.tip}
\catcode`\@ = 11
\def\DropPrefix #1#2#3{%
\if\PrefixConditional{#1}{#2}%
\edef\@PrefixConditionalTemp{%
\def\noexpand\@PrefixConditionalTempTwo #2####1%
\noexpand\@Del{%
\def\noexpand #3{####1}}%
}%
\@PrefixConditionalTemp
\ShowX{\@PrefixConditionalTemp}%
\expandafter\@PrefixConditionalTempTwo #1\@Del
\else
\wlog{\string\DropPrefix: "#2" is NOT a prefix of "#1"}%
\edef#3{#1}%
\fi
}
\catcode`\@ = 12
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