% 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 28.2.7, p. III-455.
% Original source in file "io1.TEX", starting line 470.
\wlog{L: "readnu.tip" ["io1.TEX," l. 470, p. III-455]}%
% This file DOES belong to format "texip."
\catcode`\@ = 11
\newread\@ReadNumberStream
\newcount\ReadANumberResult
\def\InitReadNumbers #1{%
   \openin\@ReadNumberStream = #1
}
\def\@ReadANumberPar{\par}
\def\ReadANumber{%
   \ifeof\@ReadNumberStream
       \ReadANumberResult = -1
   \else
       \read\@ReadNumberStream to \@ReadANumberTemp
       \ifx\@ReadANumberTemp\@ReadANumberPar
           \ReadANumberResult = -1
       \else
           \ReadANumberResult = \@ReadANumberTemp
       \fi
   \fi
}
\catcode`\@ = 12

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