% 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 28.4.1, p. III-465. % Original source in file "io1.TEX", starting line 910. \wlog{L: "fexist.tip" ["io1.TEX," l. 910, p. III-465]}% % This file DOES belong to format "texip." \catcode`\@ = 11 \newread\@FileExistsS \newif\if@FileExistsAnswer \def\FileExistsConditional #1{% TT\fi \openin\@FileExistsS = #1 \ifeof\@FileExistsS \@FileExistsAnswerfalse \else \closein\@FileExistsS \@FileExistsAnswertrue \fi \if@FileExistsAnswer } \catcode`\@ = 12