% 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 24.1.18.1, p. III-302.
% Original source in file "macros4.TEX", starting line 1096.
\wlog{L: "isprefix.tip" ["macros4.TEX," l. 1096, p. III-302]}%
% This file DOES belong to format "texip."
\InputD{compst.tip}
\InputD{strleng.tip}
\InputD{showx.tip}
\catcode`\@ = 11
\newif\if@PrefixResult
\newcount\@LengthPrefixString
\newcount\@LengthMainString
\def\PrefixConditional #1#2{%
   TT\fi
   \StringLength{#1}%
   \@LengthMainString = \StringLengthResult
   \StringLength{#2}%
   \@LengthPrefixString = \StringLengthResult
   \ifnum\@LengthMainString < \@LengthPrefixString
       \@PrefixResultfalse
   \else
       \@PrefixConditionalTwo{#1}{#2}%
   \fi
   \if@PrefixResult
}
\def\@PrefixConditionalTwo #1#2{%
   \edef\@PrefixBoth{#1#2}%
   \edef\@PrefixTemp{%
       \def\noexpand\@TestPrefix ####1#2####2\noexpand\@Del{%
           \noexpand\if\noexpand\EmptyStringConditional{####1}%
       }%
   }%
   \ShowX\@PrefixTemp
   \@PrefixTemp
   \ShowX{\@TestPrefix}%
   \expandafter\@TestPrefix\@PrefixBoth\@Del
       \@PrefixResulttrue
   \else
       \@PrefixResultfalse
   \fi
}
\catcode`\@ = 12

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