% 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 29.7.1, p. III-528.
% Original source in file "io2.TEX", starting line 1941.
\wlog{L: "comfiles.tip" ["io2.TEX," l. 1941, p. III-528]}%
% This file DOES belong to format "texip."
\InputD{compst.tip}
\InputD{verb-bas.tip}
\InputD{fexist.tip}
\InputD{endrec.tip}
\catcode`\@ = 11
\newcount\@CompareFilesResult
\newread\@ReadCompareOne
\newread\@ReadCompareTwo
\def\CompareFilesConditional #1#2{%
TT\fi
\if\FileExistsConditional{#1}%
\else
\errmessage{\string\CompareFilesConditional: first file "#1"
does not exist.}%
\fi
\if\FileExistsConditional{#2}%
\else
\errmessage{\string\CompareFilesConditional: second file "#2"
does not exist.}%
\fi
\global\@CompareFilesResult = 0
\begingroup
\MkOthers
\openin\@ReadCompareOne = #1
\openin\@ReadCompareTwo = #2
\@CompareFiles
}
