% 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