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+% \iffalse meta-comment
+%
+% arcs.dtx
+% Copyright 2004 Gianfranco Boggio-Togna
+%
+% This program may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version~1.2
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+% http://www.latex-project.org/lppl.txt
+% and version 1.2 or later is part of all distributions of LaTeX
+% version 1999/12/01 or later.
+%
+% This program consists of the files arcs.dtx and arcs.ins
+%
+%<*driver>
+\documentclass[11pt]{ltxdoc}
+\setlength{\parindent}{0pt}
+\setlength{\parskip}{1ex}
+\MakeShortVerb{|}
+% To get the documented source of the package, comment out
+% the next line and uncomment the following one.
+\OnlyDescription
+%\AlsoImplementation
+\begin{document}
+ \DocInput{arcs.dtx}
+\end{document}
+%</driver>
+%
+% \fi
+%
+% \CheckSum{188}
+% \makeatletter
+% \let\ps@titlepage=\ps@empty
+% \makeatother
+%
+% \title{{\LARGE\tt arcs.sty}\\
+% Placing an arc over (under) some text\\
+% {\small Version 1\ \ (2004/05/09)}\\\ \\}
+% \author{Gianfranco Boggio\,--Togna\\
+% \textsl{gbt\kern .08em @\kern .1em acm.org}}
+% \date{}
+% \maketitle
+% \vspace{6ex}
+% The package provides two commands for placing an arc over or under
+% a short (up to three letters) piece of text. The commands generate an
+% |\hbox| and can be used in math formulas
+% (see \textit{The \TeX{}book}, p.\,151).
+%
+% |\overarc| puts an arc above the text given as argument.\\
+% |\underarc| puts the arc below the text.
+%
+% The size of the arc is chosen so that it embraces all the text. In
+% some cases, you may wish to use a smaller or larger size. An
+% optional argument can specify a factor which
+% is multiplied by the width of the text: the size of the symbol is then
+% chosen as if the text had that width. Keep in mind, however, that only
+% a limited range of sizes is available in the Computer Modern fonts.
+% \vfill
+% {\footnotesize
+% \noindent \copyright\ Copyright 2004 Gianfranco Boggio\,--Togna.\par
+% This program may be distributed and/or modified under the
+% conditions of the \LaTeX{} Project Public License, either version~1.2
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+% \texttt{http://www.latex-project.org/lppl.txt}
+% and version 1.2 or later is part of all distributions of \LaTeX{}
+% version 1999/12/01 or later.\par
+% This program consists of the files \texttt{arcs.dtx} and
+% \texttt{arcs.ins}
+% }
+% \newpage
+% \StopEventually{}
+% \section*{The code}
+% \begin{macrocode}
+\NeedsTeXFormat {LaTeX2e}[2003/12/01]
+\ProvidesPackage {arcs}[2004/05/09]
+\RequirePackage {relsize}
+\newcommand{\overarc}[2][1]{\over@under@arc{#1}{#2}\z@}
+\newcommand{\underarc}[2][1]{\over@under@arc{#1}{#2}\@ne}
+\newcommand{\over@under@arc}[3]{%
+ \leavevmode
+ \hbox {%
+ \setbox\z@ = \hbox {#2}%
+ \ifdim \ht\z@ = \z@ % arc over/under space
+ \ifdim \dp\z@ = \z@
+ \ht\z@ = 1ex\relax
+ \fi
+ \fi
+ \dimen@ = #1\wd\z@
+ \begingroup
+ \let \rs@size@warning = \@gobbletwo
+ \relsize{-10}%
+ \wd\@ne = \z@
+ \@whiledim \wd\@ne < .95\dimen@ \do {%
+ \ifx \@currsize \Huge
+ \dimen@ = \z@
+ \else
+ $%
+ \skip@ = \f@baselineskip
+ \fontencoding{OML}\fontfamily{cmm}\fontseries{m}%
+ \fontshape{it}\fontsize{\ssf@size}{\skip@}\selectfont
+ \global \setbox\@ne = \hbox {%
+ \hss\symbol{"5\ifnum #3=\z@ F\else E\fi}\hss}%
+ \ifdim \wd\@ne < \dimen@
+ \fontsize{\sf@size}{\skip@}\selectfont
+ \global \setbox\@ne = \hbox {%
+ \hss\symbol{"5\ifnum #3=\z@ F\else E\fi}\hss}%
+ \ifdim \wd\@ne < \dimen@
+ \fontsize{\tf@size}{\skip@}\selectfont
+ \global \setbox\@ne = \hbox {%
+ \hss\symbol{"5\ifnum #3=\z@ F\else E\fi}\hss}%
+ \fi
+ \fi
+ $%
+ \fi
+ \ifdim \wd\@ne < \dimen@
+ \relsize{+1}%
+ \fi
+ \global \dimen@i = \fontdimen5\the\font
+ }%
+ \endgroup
+ \ifnum #3 = \z@
+ \dimen@ii = 1.067\ht\z@
+ \global \divide \dimen@i by \tw@
+ \global \advance \dimen@i by -\ht\@ne
+ \advance \dimen@ii by .6\dimen@i
+ \else
+ \dimen@ii = -1.05\ht\@ne
+ \advance \dimen@ii by -.75pt
+ \ifdim \dp\z@ > \z@
+ \advance \dimen@ii by -\dp\z@
+ \fi
+ \fi
+ \copy\z@
+ \dimen@ = \wd\z@
+ \advance \dimen@ by \wd\@ne
+ \kern -.5\dimen@
+ \raisebox {\dimen@ii}[\z@][\z@]{\copy\@ne}%
+ \dimen@ = \wd\z@
+ \advance \dimen@ by -\wd\@ne
+ \dimen@ = .5\dimen@
+ \kern \dimen@
+ }%
+}
+% \end{macrocode}
+%% \Finale
+\endinput