% \def\fileversion{2.2}\def\filedate{2001/06/13}\def\docdate{2001/06/19}
%\iffalse These lines are necessary for the doc and docstrip utilities
%<*asciidocu>

%%#
%%# Author:
%%#
%%# M. V\"ath      vaeth@mathematik.uni-wuerzburg.de
%%#

%%#############################################################################
%%#
%%#  With this package you may write shorter (or longer) underlines/underbars.
%%#  This is particularly useful for `underlined' variables which are needed
%%#  by some engineers.
%%#
%%#############################################################################

%%#
%%# This package was tested with plain TeX, LaTeX 2.09, and LaTeX 2e,
%%# and it should actually run with most other TeX formats.
%%#

% If you have access to (reasonable new) docstrip TeXfiles, you should run
% tex/latex on the file
%   `ushort.ins'
% to produce the files `ushort.sty', `ushort.txt' and `ushort.tex'.
% (In case `ushort.ins' is lost: You can find its content in the last
%  few lines of the file you are currently reading between the
%  lines %<*insfile> and %</insfile>;
%  BTW: You should name this file here `ushort.dtx' before you run tex
%  on ushort.ins).
%
% The file `ushort.txt' contains a `brief' (but complete) ascii
% documentation. If you have additionally access to LaTeX2e, you may run
% latex on the generated file `ushort.tex' to produce `ushort.dvi' which
% contains a more luxury documentation.
%
% If you do not have access to the docstrip TeXfiles you may simply
% copy/rename this file here into
%   `ushort.sty'
% to use the package and read the ascii documentation in this file.
% The ascii documentation (the content of `ushort.txt') consists of all
% lines in this file which start with %%# (this the above block and another
% (very large) block which follows soon).
%
% But I do not recommended this, because TeX will need more time to read this
% longer file, and because there might be a (very slight) incompatibility if
% you use it (namely if you load `ushort.sty' with some *extremely* strange
% catcodes).
% I recommend in this case instead to generate the file `ushort.sty' as
% anything between the lines %<*package> and %</package> by hand.
% (This is not precisely the file which you get with the docstrip TeXfiles,
% but a reasonable good substitute. To speed up loading, you may also
% eliminate all lines starting with `% ' in `ushort.sty').
% For your information: The file `ushort.tex' produced by the docstrip
% TeXfiles is anything between the lines %<*driver> and %</driver>
% (with a line containing \endinput and two comment lines appended).
%
%
% In any case, you end up with the file `ushort.sty'.
%
% If you can generate `ushort.tex', you will probably want to stop
% reading now and instead read the `luxury' documentation in `ushort.dvi'.
%
% Otherwise, you have to make due with the following ascii documentation.
%
%
% \fi\catcode\#14\relax\iffalse  (This line is needed for the doc utility)
%

%%# In the newsgroup de.comp.text.tex the question arose whether it is
%%# possible to define `underlined' variables: Such variables are required for
%%# complex vectors by electrical engineers.
%%# The usual \underline command is not appropriate for this purpose, because
%%# the underlines of concatenated variables merge which is not desired.
%%# One may use the macro "\ushort" of this package instead.
%%#
%%# However, this package also provides a generic macro which allows to
%%# create new commands which work similarly but use different parameters
%%# for the underlines. In particular, it is possible to create e.g. a macro
%%# which draws longer underlines than usual or which does a similar task with
%%# \underbar.

%%#
%%# Installation:
%%#

%%# To use ushort, you have to put `ushort.sty' in a path where TeX looks
%%# for its input files. The TeX documents using ushort need the
%%# following modifications in their header:
%%#
%%# a) If you use LaTeX2.09, use ushort as a style option, e.g.
%%#      \documentstyle[ushort]{article}
%%#    or
%%#      \documentstyle[ushort,12pt]{article}
%%# b) If you use LaTeX2e, put in the preamble the command
%%#      \usepackage{ushort}
%%# c) If you use some other (non-LaTeX) format, you will probably have to
%%#    insert a line like
%%#          \catcode`\@=11\relax \input ushort.sty \catcode`\@=12\relax
%%#
%%# For TeX insiders:
%%# The only LaTeX-specific commands used in `ushort.sty' are:
%%#
%%#   \newcommand (only in the form \newcommand{\command}{} to ensure that
%%#                 \command was not defined before)
%%#   \ProvidesPackage
%%#   \typeout
%%#
%%#   The above commands are used only if they are defined.
%%#

%%#
%%# Description of the provided macros:
%%#

%%# This package provides the following macros.
%%#
%%# \ushort
%%#     This command is used analogously to \underline with the difference that
%%#     the underlines are slightly shorter than usual (and so, in particular,
%%#     in concatenations of `\ushort'ed variable names the underlines do not
%%#     merge). The length of the underline is chosen under the assumption that
%%#     the argument is a single character. If you want to underline a variable
%%#     name which consists of more than one character, use instead the command
%%# \ushortw  [Mnemonic: ushort word]
%%#     which is analogous to \ushort but such that the length of the underline
%%#     is chosen appropriate for a `long' argument. (This does not look as
%%#     good as \ushort if the argument is a single character).
%%# \ushortd  [Mnemonic: ushort double]
%%#     This is analogous to \ushort except that the underline is doubled.
%%# \ushortdw [Mnemonic: ushortd word]
%%#     This is analogous to \ushortw except that the underline is doubled.
%%# \ushortdline
%%#     This is analogous to \underline except that the underline is doubled.
%%#     This command is internally used by \ushortd and \ushortdw and
%%#     thus redefinitions change also the behavior of \ushortd and \ushortdw
%%#     correspondingly.
%%#     In Plain TeX, this macro can be used only in math mode.
%%# \ushortCreate
%%#     This can be used to generate a macro which behaves similarly to \ushort
%%#     or \ushortd but for which certain parameters can be changed.
%%# \ushortEnsuremath
%%#     This is rather equivalent to the LaTeX2e macro \ensuremath
%%#     (but is available also e.g. in compatibility mode or if this package
%%#     is used with plain TeX or LaTeX 2.09).
%%#
%%# Only \ushortCreate needs a detailed description. Its call syntax is:
%%#
%%# \ushortCreate*:\command[Summand]<FactorBefore>(FactorAfter)
%%#              +{additional calculations}{Name}
%%#
%%# All arguments except for the last one {Name} are optional.
%%# Moreover, also the order of these arguments can be changed arbitrarily,
%%# and they can be repeated (all except for the last occurrence of each
%%# each type of argument is ignored).
%%# Only the last argument {Name} can not be repeated and must be at the end.
%%#
%%# This command creates a new macro \Name. It is not tested whether \Name
%%# already exists; if it exists already, it is overridden. In particular,
%%# it is admissible to use \ushortCreate to redefine \ushort, \ushortw,
%%# \ushortd, or \ushortdw. This is the recommended method, if you want to
%%# change the default values.
%%#
%%# The macro \Name can be used analogously to \underline, but the precise
%%# behavior depends on the arguments of \ushortCreate.
%%#
%%# The meaning of the arguments is as follows:
%%#
%%# *   If the * is present, then the command \underbar is used
%%#     (instead of the default \underline) to draw the underline.
%%#     Moreover, the command \underbar is not used in math mode (while
%%#     \underline is used in math mode).
%%# :\command  Use \command instead of the default \underline to draw the
%%#     underline. Whether \command is executed in math mode or not
%%#     depends on whether * has been used.
%%# [Summand]  Add Summand to the length of the underline before drawing.
%%#     Values like -.3\ht0 are admissible. Summand is expanded only when \Name
%%#     is expanded, and \wd0 or \ht0 give the width respectively height of the
%%#     argument given to \name. In particular, also the value of the unit `em'
%%#     depends on the mode in which \Name is called.
%%#     The default is empty (which means 0pt but is faster).
%%# <FactorBefore> Multiply the length of the underline before adding Summand.
%%#     The empty string means 1 (and costs no time).
%%#     The default is empty.
%%# (FactorAfter)  Multiply the length of the underline after adding Summand.
%%#     The empty string means 1 (and costs no time).
%%#     The default is `.8'.
%%# +{Additional calculations} With this argument, you can introduce an
%%#     arbitrary command sequence into the generated command: This sequence
%%#     is executed (within a group) after Summand was added, but before
%%#     FactorAfter is applied. This sequence is meant to do additional
%%#     calculation with \dimen0 which is the length of the generated
%%#     underline. When the calculations are carried out, \box0 contains the
%%#     content which is to be underlined. However, in contrast to previous
%%#     releases of this package, modifications of this box are ignored.
%%#     Instead, the registers \dimen1 and \dimen2 also contain the height and
%%#     depth of this box - you have to modify these values to attain the
%%#     desired effect.
%%#
%%# Examples:
%%#
%%# The most important examples are the macros \ushort, \ushortw, \ushortd,
%%# and \ushortdw which have been created by
%%#
%%#    \ushortCreate{ushort}
%%#    \ushortCreate()[-.1em]{ushortw}
%%#    \ushortCreate:\ushortdline{ushortd}
%%#    \ushortCreate:\ushortdline()[-.1em]{ushortdw}
%%#
%%# A further example demonstrating other parameters is
%%#
%%#    \ushortCreate(3)(.5){uline}
%%#
%%# This creates the macro \uline which underbars its argument but such that
%%# the underbar has only half of the usual length (the argument (3)
%%# in the above call is overridden by the later argument (.5)).
%%#
%%# A more useful example is
%%#
%%#    \ushortCreate()[-.3\ht0]{ushort}
%%#
%%# This modifies \ushort such that the underline is shrunken by .3 times
%%# the height of the argument of \ushort. If the argument is one letter, this
%%# means: The higher the letter, the shorter the underline. This looks good
%%# for italic fonts with some exceptions (like the letter `b').

%  This is the end of the ascii documentation
%</asciidocu>
%\fi\catcode\#6\relax
%
% \iffalse
%<*metainfo>
% \fi

% \def\basename{ushort}

%% \CharacterTable
%%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%%   Digits        \0\1\2\3\4\5\6\7\8\9
%%   Exclamation   \!     Double quote  \"     Hash (number) \#
%%   Dollar        \$     Percent       \%     Ampersand     \&
%%   Acute accent  \'     Left paren    \(     Right paren   \)
%%   Asterisk      \*     Plus          \+     Comma         \,
%%   Minus         \-     Point         \.     Solidus       \/
%%   Colon         \:     Semicolon     \;     Less than     \<
%%   Equals        \=     Greater than  \>     Question mark \?
%%   Commercial at \@     Left bracket  \[     Backslash     \\
%%   Right bracket \]     Circumflex    \^     Underscore    \_
%%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%%   Right brace   \}     Tilde         \~}

% \CheckSum{272}

% \iffalse
%   \RecordChanges
% \fi
% \def\ChangesTab{\def\mypar{\par}}\let\orichanges\changes
% \def\changes#1#2#3{\orichanges{#1}{#2}{#3}\relax
%   \expandafter\def\expandafter\ChangesTab\expandafter{\ChangesTab
%   \item[v#1 {\mdseries(\emph{#2})}] {#3.}}}
% \newcommand{\cmdcite}[1]{\texttt{\textbackslash#1}}
% \def\mypar{}

% \changes{2.2}{2001/06/13}{As
%   Alessandro Russo \texttt{<russo@ian.pv.cnr.it>} suggested,
%   the case of arguments consisting of more than a single character is
%   now documented. Corresponding macros \cmdcite{ushortw} and
%   \cmdcite{ushortdw} have been added}
% \changes{2.1}{2001/06/07}{Improved speed dramatically (up to factor 4)
%   by not using \cmdcite{phantom} anymore. Unfortunately, if bad hacks had
%   been used for the argument ``Additional calculations'' in
%   \cmdcite{ushortCreate}, they could fail to work now. For this reason,
%   the major release number has been changed.\mypar
%   Further internal change: In \cmdcite{ushrt@Main} the arguments are now
%   expanded by a loop}
% \changes{1.4}{2001/04/06}{Set defaults for the parameters as documented}
% \changes{1.3}{2001/04/05}{Added the argument for additional calculations.
%   Changed the default values of the arguments (and thus of \cmdcite{ushort})}
% \changes{1.2}{2001/04/04}{Removed a typing error in the scan macro and
%   added the commands \cmdcite{ushortd} and \cmdcite{ushortdline}}
% \changes{1.1}{2001/04/04}{Introduced clean version of
% \cmdcite{ushortEnsuremath} (and eliminated the corresponding previous hack)}
% \changes{1.0}{2001/04/03}{First beta release}
%
% \iffalse
%
% The following part is the code needed to compile the documentation.
% We do some trickery here, because we want that this file here could be used
% for *both*: Compiling the documentation *and* as `ushort.sty'
% (if really required).
% Everything between the lines %<*driver> and %</driver>
% goes to the file `ushort.tex'.
%
% \fi
\ifcat @a% If this test is positive, then `@' has letter catcode which means
%          that this file is loaded as a style file (or as described in the
%          install section of the documentation).
\def\TemporaryDummy{}
\else\long\def\TemporaryDummy{%
%
%
% \iffalse
%</metainfo>
%<*driver>
\documentclass{ltxdoc}
\OnlyDescription%% Comment this out, or
%%\AlsoImplementation%% uncomment this line, if you want to see the source.

%% If you want an index, uncomment one of the following lines.
%% After running latex a first time, you have to use
%%      makeindex -s gind.ist ushort
%% Then run latex again.
%%\CodelineIndex% comment this out if you want an index referring to codelines
%%\PageIndex% comment this out if you want an index referring to pages
%%\OldMakeindex% uncomment this line, if your MakeIndex is pre-v2.9

\setlength\hfuzz{15pt}
\hbadness=7000
\begin{document}
\DocInput{ushort.dtx}
\end{document}
%</driver>
%<*metainfo>
% \fi
}
\fi\TemporaryDummy\let\TemporaryDummy\undefined
%
% \iffalse
%          Personal macros used for the doc utility:
% \fi
% \MakeShortVerb{"}
% \def\bracemeta#1{\texttt{\{}\meta{#1}\texttt{\}}}
% \def\DescMac#1{\expandafter\DescribeMacro\expandafter{\csname#1\endcsname}}
% \def\iDescribe#1{\item[\mdseries\cmdcite{#1}:]\DescMac{#1}}
% \def\nocomment{}
% \parindent0pt

% \title{The \texttt{ushort} package\thanks
%   {This package has version number \fileversion{}, last revised \filedate.}}
% \author{Martin V\"ath\thanks
%   {\texttt{vaeth@mathematik.uni-wuerzburg.de}}}
% \date{\docdate}
% \maketitle

% \begin{abstract}
% With this package you may write shorter (or longer) underlines/underbars.
% This is particularly useful for `underlined' variables which are needed
% by some engineers.
% \end{abstract}

% You may copy this package freely, as long as you distribute only unmodified
% and complete versions.

% \tableofcontents

% \section{Changes}
%
% \begin{description}
%    \ChangesTab
% \end{description}

% \section{Introduction}
%
% In the newsgroup "de.comp.text.tex" the question arose whether it is
% possible to define `underlined' variables: Such variables are required for
% complex vectors by electrical engineers.
% The usual "\underline" command is not appropriate for this purpose, because
% the underlines of concatenated variables merge which is not desired.
% One may use the macro "\ushort" of this package instead.
%
% However, this package also provides a generic macro which allows to
% create new commands which work similarly but use different parameters
% for the underlines. In particular, it is possible to create e.g.\ a macro
% which draws longer underlines than usual or which does a similar task with
% "\underbar".

% \section{Installation}

% This package was tested with plain \TeX, \LaTeX 2.09, and \LaTeXe, and it
% should actually run with most other \TeX\ formats.

% To use ``ushort'', you have to put the file "ushort.sty" in a path where
% \TeX\ looks for its input files. The \TeX\ documents using ushort need the
% following modifications in their header:
%
% \begin{itemize}
% \item If you use \LaTeXe, put in the preamble the command
%   \begin{verbatim}
%     \usepackage{ushort}\end{verbatim}
%
% \item If you use \LaTeX 2.09, use "ushort" as a style option, e.g.\
%   \begin{verbatim}
%     \documentstyle[ushort]{article}\end{verbatim}
%    or
%   \begin{verbatim}
%     \documentstyle[ushort,12pt]{article}\end{verbatim}
%
% \item If you use some other (non-\LaTeX) format, you will probably have to
%    insert a line like
% \begin{verbatim}
% \catcode`\@=11\relax \input ushort.sty \catcode`\@=12\relax\end{verbatim}
%
% \end{itemize}
%
% For \TeX\ insiders:
% The only \LaTeX-specific commands used in "ushort.sty" are:
%
% \begin{itemize}
% \item "\newcommand" (used only in the form "\newcommand{"\meta{command}"}{}"
%       to ensure that \meta{command} was not defined before)
% \item "\ProvidesPackage"
% \item "\typeout"
% \end{itemize}
% The above commands are used only if they are defined
% (for "\typeout" a reasonable substitute is used, otherwise).

%
% \section{Description of the provided macros}
%
% This package provides the following macros.
% \begin{description}
% \iDescribe{ushort}
%   This command is used analogously to
%   "\underline" with the difference that the underlines are slightly shorter
%   than usual (and so, in particular, in concatenations of "\ushort"'ed
%   variable names the underlines do not merge).
%   The length of the underline is chosen under the assumption that
%   the argument is a single character. If you want to underline a variable
%   name which consists of more than one character, use instead the
%   following command "\ushortw".
% \iDescribe{ushortw} (Mnemonic: ``ushort word'').
%   This command is analogous to "\ushort" but such that the length of the
%   underline is chosen appropriate for a `long' argument. (This does not
%   look as good as "\ushort" if the argument is a single character).
% \iDescribe{ushortd} (Mnemonic: ``ushort double'').
%   This is analogous to "\ushort" except that the underline is doubled.
% \iDescribe{ushortdw} (Mnemonic: ``ushortd word'').
%   This is analogous to "\ushortd" except that the underline is doubled.
% \iDescribe{ushortdline}
%   This is analogous to "\underline" except that the underline is doubled.
%   This command is internally used by "\ushortd" and "\ushortdw",
%   and thus redefinitions change also the behavior of "\ushortd" and
%   "\ushortdw" correspondingly.
%   In Plain \TeX, this macro can be used only in math mode.
% \iDescribe{ushortCreate}
%   This can be used to generate a macro which behaves similarly to "\ushort"
%   or "\ushortd" but for which certain parameters can be changed.
%   For a detailed description, see below.
% \iDescribe{ushortEnsuremath}
%   This is rather equivalent to the \LaTeXe\ macro "\ensuremath"
%   (but is available also e.g.\ in compatibility mode or if this package
%   is used with plain \TeX\ or \LaTeX 2.09).
% \end{description}
%
% Only "\ushortCreate" needs a detailed description. Its call syntax is:
% \begin{quote}
%"\ushortCreate*:\"\meta{command}"["\meta{summand}"]<"\meta{factor before}">"\\
%"             "\relax
%"("\meta{factor after}")+"\bracemeta{additional calculations}\bracemeta{name}
% \end{quote}
%
% All arguments except for the last one \bracemeta{name} are optional.
% Moreover, also the order of these arguments can be changed arbitrarily,
% and they can be repeated (all except for the last occurrence of each
% each type of argument is ignored).
% Only the last argument \bracemeta{name} can not be repeated and must be at
% the end.
%
% This command creates a new macro \textbackslash\meta{name}.
% It is not tested whether \textbackslash\meta{name} already exists;
% if it exists already, it is overridden. In particular,
% it is admissible to use "\ushortCreate" to redefine "\ushort", "\ushortw",
% "\ushortd", or "\ushortdw". This is the recommended method, if you want to
% change the default values.
%
% The macro \textbackslash\meta{name} can be used analogously to "\underline",
% but the precise behavior depends on the arguments of "\ushortCreate".
%
% The meaning of the arguments is as follows:
%
% \begin{description}
% \item[\mdseries\texttt*]
%     If the "*" is present, then the command "\underbar" is used
%     (instead of the default "\underline") to draw the underline.
%     Moreover, the command "\underbar" is not used in math mode (while
%     "\underline" is used in math mode).
% \item[\mdseries\texttt:\textbackslash\meta{command}]
%     Use \textbackslash\meta{command} instead of the default "\underline" to
%     draw the underline. Whether \textbackslash\meta{command} is executed in
%     math mode or not depends on whether "*" has been used.
% \item[\mdseries\texttt{[}\meta{summand}\texttt{]}]
%     Add \meta{summand} to the length of the underline before drawing.
%     Values like "-.3\ht0" are admissible.
%     \meta{summand} is expanded only when \textbackslash\meta{name} is
%     expanded, and "\wd0" or "\ht0" give the width respectively height of the
%     argument given to "\name". In particular, also the value of the unit "em"
%     depends on the mode in which \textbackslash\meta{name} is called.
%     The default is empty (which means "0pt" but is faster).
% \item[\mdseries\texttt{<}\meta{factor before}\texttt{>}]
%     Multiply the length of the underline before adding \meta{summand}.
%     The empty string means $1$ (and costs no time).
%     The default is empty.
% \item[\mdseries\texttt{(}\meta{factor after}\texttt{)}]
%     Multiply the length of the underline after adding \meta{summand}.
%     The empty string means $1$ (and costs no time).
%     The default is "0.8".
% \item[\mdseries\texttt+\bracemeta{Additional calculations}]
%     With this argument, you can introduce an arbitrary command sequence into
%     the generated command: This sequence is executed (within a group) after
%     \meta{summand} was added, but before \meta{factor after} is applied.
%     This sequence is meant to do additional calculation with "\dimen0" which
%     is the length of the generated underline.
%     When the calculations are carried out, "\box0" contains the
%     content which is to be underlined. However, in contrast to previous
%     releases of this package, modifications of this box are ignored.
%     Instead, the registers "\dimen1" and "\dimen2" also contain the height
%     and depth of this box -- you have to modify these values to attain the
%     desired effect.
% \end{description}
%
% Examples:
% The most important examples are the macros "\ushort", "\ushortw",
% "\ushortd", and "\ushortdw" which have been created by
% \begin{verbatim}
%    \ushortCreate{ushort}
%    \ushortCreate()[-.1em]{ushortw}
%    \ushortCreate:\ushortdline{ushortd}
%    \ushortCreate:\ushortdline()[-.1em]{ushortdw}\end{verbatim}
% A further example demonstrating other parameters is
% \begin{verbatim}
%    \ushortCreate*(3)(.5){uline}\end{verbatim}
% This creates the macro "\uline" which underbars its argument but such that
% the underbar has only half of the usual length (the argument "(3)" in
% the above call is overridden by the later argument "(.5)").\par
% A more useful example is
% \begin{verbatim}
%    \ushortCreate()[-.3\ht0]{ushort}\end{verbatim}
% This modifies "\ushort" such that the underline is shrunken by $.3$ times
% the height of the argument of "\ushort". If the argument is one letter, this
% means: The higher the letter, the shorter the underline. This looks good
% for italic fonts with some exceptions (like the letter "b").


% \iffalse
%</metainfo>
% \fi
% \iffalse--------------------------------------------------------------\fi
% \StopEventually{\PrintChanges}
%                     \section{Implementation}
%
% \iffalse--------------------------------------------------------------
%
%
%<*package>
% \fi
%    \begin{macrocode}
%%
%% This file was generated by the docstrip utility from ushort.dtx.
%% You may distribute this file only together with the source ushort.dtx
%% (and if possible with ushort.ins) and only if these files are unmodified.
%%
%% Author:
%%
%% M. V\"ath      vaeth@mathematik.uni-wuerzburg.de
%%

\ifx\typeout\undefined
  \def\ushrt@tmp{\immediate\write17}
\else
  \let\ushrt@tmp\typeout
\fi
\ushrt@tmp{ushort.sty by M. Vaeth: Release: 2.2 }

%% First, some LaTeX support:

\ifx\ProvidesPackage\undefined\else
  \ProvidesPackage{ushort}[2001/06/13 v2.2]
\fi

\ifx\newcommand\undefined\else
  \newcommand{\ushort}{}
  \newcommand{\ushortw}{}
  \newcommand{\ushortd}{}
  \newcommand{\ushortdw}{}
  \newcommand{\ushortdline}{}
  \newcommand{\ushortCreate}{}
  \newcommand{\ushortEnsuremath}{}
\fi

%% The implementation follows

%    \end{macrocode}
%
% \begin{macro}{\ushortCreate}
% We first scan the parameters into various macros. Then we call "\ushrt@Main".
%    \begin{macrocode}
\def\ushortCreate{\let\ushrt@calc\ushrt@empty\let\ushrt@TextMode\undefined
  \def\ushrt@FactorAfter{0.8}\let\ushrt@FactorBefore\ushrt@calc
  \let\ushrt@Summand\ushrt@empty\def\ushrt@cmd{\underline}\ushrt@TestLoop}
\def\ushrt@TestLoop{\ushrt@TestAndExec*\ushrt@Star\ushrt@TestCommand}
\def\ushrt@Star*{\def\ushrt@cmd{\underbar}\let\ushrt@TextMode\ushrt@empty
  \ushrt@TestLoop}
\def\ushrt@TestCommand{\ushrt@TestAndExec:\ushrt@GetCommand\ushrt@TestCalc}
\def\ushrt@GetCommand:#1{\def\ushrt@cmd{#1}\ushrt@TestLoop}
\def\ushrt@TestCalc{\ushrt@TestAndExec+\ushrt@GetCalc\ushrt@TestSummand}
\def\ushrt@GetCalc+#1{\def\ushrt@calc{#1}\ushrt@TestLoop}
\def\ushrt@TestSummand{\ushrt@TestAndExec[%]
  \ushrt@GetSummand\ushrt@TestFactorBefore}
\def\ushrt@GetSummand[#1]{\def\ushrt@Summand{\advance\dimen0 by#1}%
  \ushrt@TestLoop}
\def\ushrt@TestFactorBefore{\ushrt@TestAndExec<%>
  \ushrt@GetFactorBefore\ushrt@TestFactorAfter}
\def\ushrt@GetFactorBefore<#1>{\def\ushrt@FactorBefore{#1}\ushrt@TestLoop}
\def\ushrt@TestFactorAfter{\ushrt@TestAndExec(%)
  \ushrt@GetFactorAfter\ushrt@Main}
\def\ushrt@GetFactorAfter(#1){\def\ushrt@FactorAfter{#1}\ushrt@TestLoop}

%    \end{macrocode}
%
%  \begin{macro}{\ushrt@TestAndExec}
%  "\ushrt@TestAndExec" is a submacro needed to scan the parameters.
%    \begin{macrocode}
\def\ushrt@TestAndExec#1#2#3{%
  \ushrt@SkipAndExec{%
    \ifx\ushrt@NextToken#1%
      \def\ushrt@exec{#2}%
    \else
      \def\ushrt@exec{#3}%
    \fi
    \ushrt@exec}}
\def\ushrt@SkipAndExec#1{\def\ushrt@tmp{#1}\ushrt@skip}
\def\ushrt@skip{\futurelet\ushrt@NextToken\ushrt@tmp}

%    \end{macrocode}
%  \end{macro}
%  \begin{macro}{\ushrt@Main}
%  "\ushrt@Main" calls "\ushrt@Define" with appropriately expanded parameters.
%    \begin{macrocode}
\def\ushrt@Main#1{\def\ushrt@exec{\ushrt@Define}\ushrt@ExpandLoop
  \ushrt@cmd\ushrt@calc\ushrt@Summand\ushrt@FactorBefore\ushrt@FactorAfter
  {\csname#1\endcsname}{\csname ushrt@#1\endcsname}{}}

%    \end{macrocode}
%   \begin{macro}{\ushrt@ExpandLoop}
%   "\ushrt@ExpandLoop" expands successively the first token in each argument
%   by precisely one level (until the empty argument is reached which marks
%   the end of the argument list).
%   The expanded arguments are put into "{...}" and added to the end of the
%   content of "\ushrt@exec".
%   When all arguments have been parsed, "\ushrt@exec" is executed.
%    \begin{macrocode}
\def\ushrt@ExpandLoop#1{\def\ushrt@tmp{#1}%
  \ifx\ushrt@tmp\ushrt@empty
    \let\ushrt@tmp\ushrt@exec
  \else
    \let\ushrt@tmp\ushrt@ExpandLoop
    \expandafter\ushrt@Expand\expandafter{#1}%
  \fi\ushrt@tmp}
\def\ushrt@Expand#1{\expandafter
  \def\expandafter\ushrt@exec\expandafter{\ushrt@exec{#1}}}

%    \end{macrocode}
%   \end{macro}
%  \end{macro}
%  \begin{macro}{\ushrt@Define}
% All arguments of "\ushrt@Define" must be expanded. The call syntax is:
% \begin{quote}
%"\ushrt@Define"\relax
%\bracemeta{underline command}\bracemeta{calculations}\bracemeta{summand}\\
%"             "\relax
%\bracemeta{factor before}\bracemeta{factor after}"{\"\meta{name}"}"\relax
%"{\ushrt@"\meta{name}"}"
% \end{quote}
% Actually, \meta{summand} is not only the pure summand but the token sequence
% "\advance\dimen0 by"\meta{value}; \meta{summand} may also be empty.
%    \begin{macrocode}
\def\ushrt@Define#1#2#3#4#5#6#7{%
  \def#6##1{\ushortEnsuremath{\mathpalette#7{##1}##1}}%
  \ifx\ushrt@TextMode\undefined
    \def#7##1##2{\hbox to 0pt{{\mathsurround0pt$#1{%
      {\setbox0\hbox{\mathsurround0pt$##1##2$}%
        \dimen0=#4\wd0#3\dimen1\ht0\dimen2\dp0#2%
        \setbox0\hbox to#5\dimen0{}\ht0\dimen1\dp0\dimen2%
        \box0}}$\hss}}}%
  \else
    \def#7##1##2{\hbox to 0pt{#1{%
      {\setbox0\hbox{\mathsurround0pt$##1##2$}%
        \dimen0=#4\wd0#3\dimen1\ht0\dimen2\dp0#2%
        \setbox0\hbox to#5\dimen0{}\ht0\dimen1\dp0\dimen2%
        \box0}}\hss}}%
  \fi}

%    \end{macrocode}
%  \end{macro}
% \end{macro}
%
% \begin{macro}{\ushortEnsuremath}
% Since "\ensuremath" does not work due to \LaTeXe's irritating test for
% compatibility mode (and in order to use this package also for plain \TeX\
% and \LaTeX 2.09), we must write our own "\ensuremath" command. The command
% "\relax" in the beginning is necessary, because otherwise our command would
% not work if it is the first command in e.g.\ an "{eqnarray}" environment.
%    \begin{macrocode}
\def\ushortEnsuremath{\relax
  \ifmmode
    \let\ushrt@exec\ushrt@NoSwitch
  \else
    \let\ushrt@exec\ushrt@Switch
  \fi\ushrt@exec}
\def\ushrt@NoSwitch#1{#1}
\def\ushrt@Switch#1{\relax$#1\relax$\relax}

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ushrt@empty}
% We do not want to rely on the fact that "\empty" is defined as "{}", so
% we use our own definition.
%    \begin{macrocode}
\def\ushrt@empty{}

%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ushort}
% "\ushort" is nothing else but an instance created by "\ushortCreate"
% with the default values.
%    \begin{macrocode}
\ushortCreate{ushort}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ushortw}
% "\ushortw" is nothing else but an instance created by "\ushortCreate"
% where the default values are changed by omitting \meta{factor after} and
% by setting another value for \meta{summand}:
%    \begin{macrocode}
\ushortCreate()[-.1em]{ushortw}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ushortd}
% "\ushortd" is nothing else but an instance created by "\ushortCreate"
% with the default values but the \textbackslash\meta{command} value
% "\ushortdline":
%    \begin{macrocode}
\ushortCreate:\ushortdline{ushortd}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ushortdw}
% "\ushortdw" is nothing else but an instance created by "\ushortCreate"
% where the default values are modified as in "\ushortw" and "\ushortd":
%    \begin{macrocode}
\ushortCreate:\ushortdline()[-.1em]{ushortdw}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\ushortdline}
%  "\ushortdline" in turn is very simple to implement:
%    \begin{macrocode}
\def\ushortdline#1{\underline{\underline #1}}
%    \end{macrocode}
% \end{macro}
%
%
% \iffalse
%</package>
% \fi
% \Finale\PrintIndex
%
%
%
% \iffalse
%<*metainfo>
% \fi
\iffalse -------------------------------------------------------------
%
% Just in case that for some reason the file `ushort.ins' got lost:
% The content of this file is between the lines %<*insfile> and %</insfile>.
%
%\iffalse
%</metainfo>
%<*insfile>
\def\batchfile{ushort.ins}
\input docstrip.tex
\keepsilent
\nopreamble
\generateFile{ushort.sty}{f}{\from{ushort.dtx}{package}}
\generateFile{ushort.txt}{f}{\from{ushort.dtx}{asciidocu}}
\generateFile{ushort.tex}{f}{\from{ushort.dtx}{driver}}
%%\generateFile{ushort.ins.dup}{f}{\from{ushort.dtx}{insfile}}

\Msg{***************************************************************}
\Msg{*}
\Msg{* To finish the installation you have to move the}
\Msg{* file 'ushort.sty' into a directory searched by TeX.}
\Msg{*}
\Msg{*}
\Msg{* Run the file ushort.tex through LaTeX to produce the}
\Msg{* documentation or read the ascii documentation in ushort.txt}
\Msg{*}
\Msg{*}
\Msg{***************************************************************}
\endbatchfile
%</insfile>
%<*metainfo>
% \fi
\fi
% \iffalse
%</metainfo>
% \fi
\endinput

%%% Local Variables: 
%%% mode: latex
%%% TeX-master: "ushort.tex"
%%% End: 
