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% 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 28.5.3, p. III-474.
% Original source in file "io1.TEX", starting line 1339.
\wlog{L: "genostr.tip" ["io1.TEX," l. 1339, p. III-474]}%
% This file DOES belong to format "texip."
\catcode`\@ = 11
\newwrite\GenericOStream
\newif\if@GenericOStreamOpen
\@GenericOStreamOpenfalse
\def\OpenGenericOStream #1{%
    \if@GenericOStreamOpen
        \errmessage{\string\OpenGenericOStream: generic
            output stream currently open.}%
    \else
        \global\@GenericOStreamOpentrue
        \immediate\openout\GenericOStream = #1%
    \fi 
}
\def\CloseGenericOStream{%
    \if@GenericOStreamOpen
        \global\@GenericOStreamOpenfalse
        \immediate\closeout\GenericOStream
    \else
        \errhelp{Stream not in use.}%
        \errmessage{\string\CloseGenericOStream:
            stream is NOT open for output.}%
    \fi 
}
\catcode`\@ = 12