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-% fixunder.sty,  31 May 1990, John T. Kohl
-%
-% The contents of this file are in the public domain.
-%
-%
-% play games with _ to make it active and to provide a reasonable _
-% character (from \tt in most cases), and a discretionary word-break point.
-
-%
-% Some \makeunder... macros for convenience in setting catcodes.
-%
-\def\makeunderactive{\catcode`\_=\active\relax}
-\def\makeunderother{\catcode`\_=12\relax}
-\def\makeunderletter{\catcode`\_=11\relax}
-\def\makeundernormal{\catcode`\_=8\relax}
-\makeunderother
-\def\cctwlunder{_}
-
-%
-% The hair here is to allow things like \index to work reasonably with
-% the new definition of underscore when the argument to index is part of
-% a macro replacement and as such gets tokenized before \index is
-% evaluated.
-% [in the normal case at top-level, \index{foo_bar} works since \index
-% does some hair to make _ into a reasonable character code, and \index
-% does NOT use a macro expansion.  If you have something like
-% \def\foo#1#2{\index{#1} bar #2}
-% then \foo{baz_quux}{frobnitz} will result in baz_quux getting
-% tokenized BEFORE \foo is expanded, so that the catcode hair in \index
-% is to no avail.]
-%
-% \underrealfalse declares that you want to replace with the \tt _;
-% \underrealtrue declares that you want to replace with \char95 (ASCII _).
-%
-% for things like \index which write things out to files, set
-% \underrealfalse before evaluating the \index macro, and what actually
-% gets written to the file is an _, rather than something like
-% {\leavemode \kern... } (the typical definition of \_).
-%
-% the above example would then be
-% \def\foo#1#2{\underrealfalse\index{#1}\underrealtrue bar #2}
-%
-
-\newif\ifunderreal
-\underrealfalse
-\makeunderactive
-\def_{\ifunderreal\cctwlunder\else\leavevmode {\tt \cctwlunder}\discretionary{}{}{}\fi}
-\let\_=_