/usr/share/texmf/tex/latex/tipa/exaccent.sty is in tipa 2:1.3-20.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | % exaccent.sty: for extended accent.
% Copyright 2002 FUKUI Rei
%
% 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 all files listed in Manifest.txt.
%
% Version 1.0 1996/06/10
%
% This file is based on `tsipa.sty' for TSIPA created by
% KOBAYASHI Hajime, FUKUI Rei and SHIRAKAWA Shun.
%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{exaccent}[1996/06/10 extended accent Version 1.0]
{\slshape\xdef\@slshapename{\f@shape}}
{\itshape\xdef\@itshapename{\f@shape}}
\newcommand\upperaccent{\@ifnextchar[{\upper@accent a\empty}%
{\upper@accent a\empty[\z@]}}
\newcommand\Upperaccent{\@ifnextchar[{\upper@accent b\empty}%
{\upper@accent b\empty[\z@]}}
\newcommand\loweraccent{\@ifnextchar[{\lower@accent a\empty}%
{\lower@accent a\empty[\z@]}}
\newcommand\Loweraccent{\@ifnextchar[{\lower@accent b\empty}%
{\lower@accent b\empty[\z@]}}
\def\upper@accent#1#2[#3]#4#5{{\leavevmode
\setbox\z@\hbox{#5}\setbox\@ne\hbox{#2%
\if a#1\char#4\else#4\fi}%
\ifx\empty#5\empty\box\@ne\else
\@getaccshift \let\c@lcshift\@pshift
\dimen\z@\ht\@ne
\ifdim\ht\@ne>1ex \advance\dimen\z@ -1ex \else
\ifdim\ht\@ne=\z@ \dimen\z@\dp\@ne \fi\fi
\vbox{\hsize\wd\z@\offinterlineskip
\hb@xt@\z@{\@accshift{#3}\hb@xt@\wd\z@{%
\hss\vbox to \dimen\z@{\hbox{\box\@ne}\vss}\hss}\hss}
\kern#3
\hbox{#5}}\fi}}
\def\lower@accent#1#2[#3]#4#5{{\leavevmode
\setbox\z@\hbox{#5}\setbox\@ne\hbox{#2%
\if a#1\char#4\else#4\fi}%
\ifx\empty#5\empty\box\@ne\else
\@getaccshift \let\c@lcshift\s@bshift
\dimen\z@\ht\@ne
\ifdim\ht\@ne>1ex \advance\dimen\z@ -1.1ex \else
\ifdim\ht\@ne=\z@ \dimen\z@\dp\@ne \fi\fi
\vtop{\hsize\wd\z@\offinterlineskip
\hbox{#5}
\kern#3
\hbox{\@accshift{#3}\hb@xt@\wd\z@{%
\hss\vbox to \dimen\z@{\hbox{\box\@ne}\vss}\hss}}}\fi}}
\newcommand\@getaccshift{\def\@accshift##1{}%
\ifx\f@shape\@slshapename\let\@accshift\@accshiftsl\fi
\ifx\f@shape\@itshapename\let\@accshift\@accshiftsl\fi}
\newcommand\@accshiftsl[1]{\c@lcshift{#1}\kern-.16667\dimen\@ne}
\newcommand\@pshift[1]{%
\dimen\@ne-\ht\z@ % get height of the box to be accented
\advance\dimen\@ne -#1% % add margin between the letter and accent
\ifdim\ht\@ne>1ex
\advance\dimen\@ne 1ex\else
\ifdim\ht\@ne=\z@
\advance\dimen\@ne -\dp\@ne\fi\fi}
\newcommand\s@bshift[1]{%
\dimen\@ne\dp\z@ % get depth of the box to be accented
\ifdim\ht\@ne>\z@
\advance\dimen\@ne \ht\@ne\fi % add ht of the accent
\ifdim\ht\@ne>1ex
\advance\dimen\@ne #1\fi} % add margin between the letter and accent
\endinput
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