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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 25.1.18, p. III-339.
+% Original source in file "macros5.TEX", starting line 1300.
+\wlog{L: "ctestcs.tip" ["macros5.TEX," l. 1300, p. III-339]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\newif\if@ControlSequenceConditional
+\def\ControlSequenceConditional #1{%
+ TT\fi
+ {%
+ \escapechar = -1
+ \xdef\@ControlSequenceConditionalOne{\string#1}%
+ \escapechar = `:\relax
+ \xdef\@ControlSequenceConditionalTwo{\string#1}%
+ }%
+ \ifx\@ControlSequenceConditionalOne
+ \@ControlSequenceConditionalTwo
+ \@ControlSequenceConditionalfalse
+ \else
+ \@ControlSequenceConditionaltrue
+ \fi
+ \if@ControlSequenceConditional
+}
+\catcode`\@ = 12