%D \module
%D   [       file=core-uti,
%D        version=1997.03.31,
%D          title=\CONTEXT\ Core Macros,
%D       subtitle=Utility File Handling,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

\def\savecurrentvalue#1#2%
  {\immediatewriteutilitycommand{\initializevariable\string#1{#2}}}

\let\initializevariable\gdef

\appendtoks
    \globallet\initializevariable\gobbletwoarguments
\to \everyafterutilityread

\edef\testbytesequence
  {\rawcharacter{7}%
   \rawcharacter{27}%
   %rawcharacter{227}% invalid in xetex, which expects utf
   \rawcharacter{195}\rawcharacter{128}} % valid utf code

\def\thisisbytesequence#1%
  {\ifx\testbytesequence\empty\else
     \convertcommand\testbytesequence\to\testbytesequence
     \convertargument#1\to\ascii
     \ifx\testbytesequence\ascii \else
       \writestatus\m!systems{possible problem with 8 bit output}%
     \fi
   \fi
   \global\let\thisisbytesequence\gobbleoneargument}

\beginXETEX
    \let\testbytesequence\empty
\endXETEX

\appendtoks
  \immediatewriteutilitycommand{\thisisbytesequence{\testbytesequence}}%
\to \everyopenutilities

\endinput