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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: 1.1
+% Date: Sep 10, 1993
+%
+%
+% This source code is documented in 28.4.3, p. III-468.
+% Original source in file "io1.TEX", starting line 1076.
+\wlog{L: "inputd.tip" ["io1.TEX," l. 1076, p. III-468]}%
+% This file DOES belong to format "texip."
+\input namedef.tip
+\newif\ifInputDVerbose
+\InputDVerbosefalse
+\catcode`\@ = 11
+\newif\if@InputDList
+\@InputDListfalse
+\def\@InputDPrefix{@InputD-}
+\NameDef{\@InputDPrefix namedef.tip}{}
+\def\InputD #1{%
+ \if\NameDefinedConditional{\@InputDPrefix #1}%
+ \ifInputDVerbose
+ \wlog{\string\InputD: file "#1" was read-in before.}%
+ \fi
+ \else
+ \NameDef{\@InputDPrefix #1}{}%
+ \input #1
+ \if@InputDList
+ \immediate\write\@InputDStream{#1}%
+ \fi
+ \fi
+}
+\catcode`\@ = 12
+\InputD{inputdl.tip}