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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