\input TrIOsupport.tex
%
% First, macro for \input
%
\def\input{\TRIObegingroup \TrIOhandleglobaldefs \TrIOcountiocmd
   \TrIOsetcatcodes \TrIOcount=\TRIOinputlineno \TRIOlet\TrIOnxt==%
   \TRIOinput TrIOopen.tex }
\def\TrIOcCkPxXmove#1\input{% transfer tokens closer to \input
   \def\TrIOcCkPxXtransfer{#1}\input}
%
% Second, macros for \openin and \openout (\immediate is handled in TrIOnames.tex)
%
\def\openin{\TRIOthe\TrIOtropenin} \TrIOtropenin={\TrIOopenin}
\def\TrIOopenin{\TRIObegingroup \TrIOhandleglobaldefs \TrIOcountiocmd
   \TRIOxdef\TrIOnext{\TrIOcount=\TRIOthe\TRIOinputlineno}%
   \TRIOafterassignment\TrIOOpenIn \TrIOcount=}
\def\TrIOOpenIn{\TRIOafterassignment\TrIOOPENIN \TRIOglobal\TRIOlet\TrIOnxt=}
\def\TrIOOPENIN{\TrIOnext \TrIOsetcatcodes \TRIOinput TrIOopen.tex }
\let\openout=\openin
%
% Third, macros used in TrIOnames.tex
%
\def\TrIOenvinput{% set \TrIOleft and \TrIOright for \input
   \TRIOlet\TrIOleft=\TrIOendgroup \TRIOlet\TrIOright=\TRIOrelax}
\def\TrIOenvopen{%  set \TrIOleft and \TrIOright for \openin & \openout
   \TRIOlet\TrIOleft=\TRIOrelax \TRIOlet\TrIOright=\TrIOendgroup}
%
\def\TrIOfFLouUexecute{% password-protected name
   \TRIOifx=\TrIOnxt \TRIOgdef\TrIOnext{TrIO_}%
   \TRIOelse \TRIOgdef\TrIOnext{TrIO_\TrIOnxt}%
   \TRIOfi \TRIOafterassignment\TrIOfFLouUdoiocmd
   \TRIOfont\TRIOunused=\TrIOnext}
\def\TrIOfFLouUdoiocmd{% execute the I/O command
   \TRIOlet\TrIOnext=\TRIOundefined \TrIOresumeafterassignment
   % \TRIOunused is ``select font nullfont''
   % \TrIOiocmd is undefined for \openin & \openout, \TRIOinput for \input
   % \TrIOfile is undefined for \openin & \openout, file name for \input
   \TRIOifx\TrIOright\TRIOrelax \TRIOexpandafter\TrIOleft
      \TRIOexpandafter\TrIOiocmd\TRIOexpandafter\TrIOfile
   \TRIOelse \TrIOiocmd\TrIOfile\TrIOright
   \TRIOfi}
%
% Start
%
\TRIOinput TrIOprivate.tex
\TRIOinput TrIOnames.tex
\begingroup \newlinechar=`\^^J
\errhelp{File I/O ( \input\openin\openout) is now under TrIO's control.^^JBe
   alerted if a file is loaded without the proper TrIO message^^Jand
   check that the file name without extension that raises^^Jthe font error matches
   the file name of the TrIO message.}
\ifx y\disablespecial % deactivate \special; write to log file
   \TrIOmessage{<<< TrIO >>> \string\special: disabled, trace in \jobname.log}
\else\ifx n\disablespecial % trace \special
   \TrIOmessage{<<< TrIO >>> \string\special: primitive, trace in \jobname.log}
\else
   \TrIOmessage{<<< TrIO >>> \string\special: primitive}
\fi\fi
\let\threenosubdirs=\undefined \let\twonosubdirs=\undefined
\let\disablespecial\undefined
\errmessage{TrIO auto-mode activated. Type h to get instructions}\endgroup