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latex209.dtx
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% \iffalse meta-comment
%
% Copyright (C) 1993-2025
% The LaTeX Project and any individual authors listed elsewhere
% in this file.
%
% This file is part of the LaTeX base system.
% -------------------------------------------
%
% It may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3c
% of this license or (at your option) any later version.
% The latest version of this license is in
% https://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2008 or later.
%
% This file has the LPPL maintenance status "maintained".
%
% The list of all files belonging to the LaTeX base distribution is
% given in the file `manifest.txt'. See also `legal.txt' for additional
% information.
%
% The list of derived (unpacked) files belonging to the distribution
% and covered by LPPL is defined by the unpacking scripts (with
% extension .ins) which are part of the distribution.
%
% \fi
%
% \title{Compatibility mode for \LaTeXe{} emulating \LaTeX~2.09}
% \author{Alan Jeffrey and Frank Mittelbach}
% \date{2024/11/16}
%
%
%
% \changes{v0.01}{1993/12/11}{Created the file, including:
% setting the compatibility flag,
% inputting oldlfont.sty,
% setting the default encoding to be OT1, and
% inputting the latex209.rc file}
% \changes{v0.02}{1993/12/12}{Changed the package filename to
% latex209.sty, and added the provides-package command.}
% \changes{v0.03}{1993/12/16}{Added an empty mark, replaced
% provides-package with provides-file, added the compatibility hook.}
% \changes{v0.04}{1993/12/16}{Moved oldlfont.sty out of the
% compatibility hook and back into latex209.cmp. Redefined
% newfontswitch to ignore redefinitions. Set the LaTeX 2e commands
% to be errors.}
% \changes{v0.05}{1993/12/17}
% {Removed the \cs{mark}, since it is now in the kernel.}
% \changes{v0.06}{1993/12/18}{Replaced the redefinition of
% \cs{@newfontswitch} to a redefinition of \cs{@renewfontswitch}.
% Added \cs{sloppy.}}
% \changes{v0.07}{1993/12/18}{Fixed a bug with \cs{@missingfileerror}.}
% \changes{v0.08}{1993/12/18}{Added the obsolete .sty files.}
% \changes{v0.09}{1993/12/20}{Removed art10.sty and friends.}
% \changes{v0.10}{1994/01/14}{Replaced latex209.rc by latex209.cfg.}
% \changes{v0.11}{1994/01/21}{Replaced latex209.cmp by latex209.def.
% Moved half of oldlfont.dtx to here. Split the package dst option
% into head and tail.}
% \changes{v0.12}{1994/01/24}
% {Added \cs{normalshape} and \cs{mediumseries}, and
% declared the `oldlfont' option to stop oldlfont.sty from being
% loaded.}
% \changes{v0.13}{1994/01/31}{removed setting of \cs{normalsize}. FMi}
% \changes{v0.14}{1994/02/07}{Added it back again.}
% \changes{v0.15}{1994/02/10}{Renamed \cs{@compatibility} to
% \cs{@documentclasshook}. Added the check for whether
% \cs{normalsize} or \cs{@normalsize} needs defined.}
% \changes{v0.16}{1994/02/11}{Replaced the allocation of temporary
% dimens for \cs{footheight}, \cs{@maxsep} and \cs{@dblmaxsep}
% by real dimen variables.}
% \changes{v0.17}{1994/03/02}{Moved the documentation to the front, so
% this file can be processed directly without a driver file.
% Added \cs{@ptscale}, \cs{@halfmag}, \cs{@magscale}, and set the
% default font to be CMR at 10pt.}
% \changes{v0.18}{1994/03/11}{Restored the old definition of \cs{verb}.
% Set the catcodes of the non-alphanumerics.}
% \changes{v0.19}{1994/04/05}{Switched off more 2e features: \cs{lrbox},
% \cs{width}, \cs{height}, \cs{depth} in box dimensions, and the new
% optional arguments to \cs{parbox}, \cs{minipage} and
% \cs{newcommand}. The code was provided by DPC. Fixed a misplaced
% </head!>. Made the \cs{ProvidesPackage} and \cs{ProvidesClass}
% warnings log messages. Removed \cs{filedate}.}
% \changes{v0.20}{1994/04/20}
% {Restored the 2.09 definition of \cs{@noligs}.}
% \changes{v0.21}{1994/04/24}
% {Restored the 2.09 definition of \cs{@lquote}.}
% \changes{v0.22}{1994/05/02}{Added \cs{@latex@e@command}.}
% \changes{v0.23}{1994/05/11}{Added bezier.sty.}
% \changes{v0.24}{1994/05/14}{Removed \cs{@@@} and switched the box
% commands back on, for use in packages.}
% \changes{v0.24}{1994/05/14}{Changed the 2e command error help.}
% \changes{v0.24}{1994/05/14}{Removed date from announcement of
% 2.09 mode.}
% \changes{v0.25}{1994/05/14}{Added the newlfont option, and rewrote the
% oldlfont option.}
% \changes{v0.26}{1994/05/15}{Added the margid and nomargid options.}
% \changes{v0.27}{1994/05/16}{Fixed a bug with the margid option.}
% \changes{v0.28}{1994/05/16}{Fixed a bug with \cs{mediumseries}.}
% \changes{v0.29}{1994/05/17}{Fixed a bug with \cs{newlfont}.}
% \changes{v0.29}{1994/05/17}{Removed extra spaces from the missing
% file error.}
% \changes{v0.29}{1994/05/17}{Made the bezier package use \cs{iffalse}
% to comment itself out, rather than \%\%, which caused it to
% appear in every 2.09 file.}
% \changes{v0.30}{1994/05/18}{Added \cs{@finalstrut}.}
% \changes{v0.31}{1994/05/20}{New definition of \cs{@finalstrut}.}
% \changes{v0.31}{1994/05/20}{Added the t1enc package.}
% \changes{v0.32}{1994/05/20}{Added SLiTeX.}
% \changes{v0.33}{1994/06/01}{Fixed bug with SLiTeX.}
% \changes{v0.34}{1994/08/22}{Replaced l2euser by usrguide.}
% \changes{v0.34}{1994/08/22}{Added a default definition for \cs{+}.}
% \changes{v0.35}{1994/09/23}
% {Added spaces to the old font scale commands.}
% \changes{v0.36}{1994/10/17}{Added an empty \cs{mark} back again.}
% \changes{v0.37}{1994/10/20}{Corrected a typo.}
% \changes{v0.38}{1994/11/16}{Removed \cs{LaTeXe} from this list}
% \changes{v0.39}{1994/11/28}{Added old behaviour of floats and space.}
% \changes{v0.40}{1995/05/05}{Make \cs{verb} use \cs{tt} font in
% math mode.}
% \changes{v0.49}{1995/10/26}{Added code for fleqn.sty, leqno.sty,
% openbib.sty.}
% \changes{v0.50}{1995/12/08}{Switched of \cs{@inmathwarn}.}
% \changes{v0.53}{2015/02/22}{Dropped \cs{@no@font@optfalse} in various places
% - no longer provided by ltfsscmp.dtx.}
%
% \MaintainedByLaTeXTeam{latex}
% \maketitle
%
% \section{Introduction}
%
% The file |latex209.def| is read in by \LaTeXe{} whenever it finds a
% |\documentstyle| rather than |\documentclass| command at the
% beginning of the file. This indicates a \LaTeX~2.09 document, which
% should be processed in {\em compatibility mode}.
%
% Any document which compiled under \LaTeX~2.09 should compile under
% compatibility mode, unless it uses low-level commands such as
% |\tenrm|.
%
% \section{The docstrip modules}
%
% The following modules are used in the implementation to direct
% docstrip in generating the external files:
% \begin{center}
% \begin{tabular}{ll}
% driver & produce a documentation driver file \\
% head & produce the beginning of |latex209.def| \\
% tail & produce the end of |latex209.def| \\
% article & produce |article.sty| \\
% book & produce |book.sty| \\
% report & produce |report.sty| \\
% slides & produce |slides.sty| \\
% letter & produce |letter.sty| \\
% bezier & produce |bezier.sty| \\
% fleqn & produce |fleqn.sty| \\
% leqno & produce |leqno.sty| \\
% openbib & produce |openbib.sty|
% \end{tabular}
% \end{center}
% Between the |head| and |tail| of |latex209.def|, the code for
% |oldlfont.sty| is included, so \LaTeX~2.09 documents will
% automatically be run simulating the OFSS.
% \changes{v0.09}{1993/12/20}{Removed artN.sty, bkN.sty and repN.sty.}
% \changes{v0.11}{1994/01/21}{Split package into head and tail.}
% \changes{v0.23}{1994/05/11}{Added bezier option.}
%
% \MaybeStop{}
%
% \section{Driver}
%
% This section contains the driver for this documentation.
% \begin{macrocode}
%<*driver>
\documentclass{ltxdoc}
\DisableCrossrefs
% \OnlyDescription
\begin{document}
\DocInput{latex209.dtx}
\end{document}
%</driver>
% \end{macrocode}
%
% \section{Beginning of latex209.def}
%
% \changes{v0.11}{1994/01/21}{oldlfont.dtx is now also used to generate
% latex209.dtx.}
%
% This section describes the beginning of the file |latex209.def|.
% \begin{macrocode}
%<*head>
% \end{macrocode}
%
% \subsection{Identification}
%
% This file needs to be run with \LaTeXe.
% \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}
% \end{macrocode}
% Describe the file.
% \begin{macrocode}
\ProvidesFile{latex209.def}[2020/11/26 v0.55 Standard LaTeX file]
% \end{macrocode}
% \changes{v0.24}{1994/05/14}{Removed date.}
% \changes{v0.40}{1995/03/21}
% {(DPC) Do not execute this file twice latex/1460}
% Announce compatibility mode to the user.
% \changes{v0.52}{1998/05/13}{Added experimental
% long typeout to possibly avoid prs like 2807}
% \begin{macrocode}
\if@compatibility
\expandafter\endinput
\else
\typeout{^^J\space
\@spaces\@spaces\space Entering LaTeX 2.09 COMPATIBILITY MODE^^J\space
*************************************************************^^J\space
\space\space\space!!WARNING!!\space
\space\space\space!!WARNING!!\space
\space\space\space!!WARNING!!\space
\space\space\space!!WARNING!!\space\space\space ^^J\space
^^J\space
This mode attempts to provide an emulation of the LaTeX 2.09^^J\space
author environment so that OLD documents can be successfully^^J\space
processed. It should NOT be used for NEW documents!^^J\space
^^J\space
New documents should use Standard LaTeX conventions and start^^J\space
with the \string\documentclass\space command.^^J\space
^^J\space
Compatibility mode is UNLIKELY TO WORK with LaTeX 2.09 style^^J\space
files that change any internal macros, especially not with^^J\space
those that change the FONT SELECTION or OUTPUT ROUTINES.^^J\space
^^J\space
Therefore such style files MUST BE UPDATED to use^^J\space
\@spaces\@spaces\space Current Standard LaTeX: LaTeX2e.^^J\space
If you suspect that you may be using such a style file, which^^J\space
is probably very, very old by now, then you should attempt to^^J\space
get it updated by sending a copy of this error message to the^^J\space
author of that file.^^J\space
*************************************************************^^J}
\fi
% \end{macrocode}
%
% \subsection{Compatibility flag}
%
% \begin{macro}{\@compatibilitytrue}
% \LaTeXe{} has a flag |\if@compatibility| which can be used by
% document classes or packages to determine whether they are running
% in compatibility mode or not. This flag is set true by this file.
% \begin{macrocode}
\@compatibilitytrue
% \end{macrocode}
% \end{macro}
%
% \subsection{Removing features}
%
% \changes{v0.22}{1994/05/02}{Added \cs{@latex@e@command}.}
% \changes{v0.36}{1994/10/17}{Redid switching off commands.}
% \changes{v0.38}{1994/11/16}{Removed \cs{LaTeXe} from this list}
%
% \begin{macro}{\usepackage}
% \begin{macro}{\listfiles}
% \begin{macro}{\ensuremath}
% \begin{macro}{\lrbox}
% \begin{macro}{\newcommand}
% These \LaTeXe{} commands are switched off in compatibility mode.
% This is done by saving the old definition, and redefining the
% command to call |\@latex@e@error| before executing the old version.
% \begin{macrocode}
\def\@tempa#1#2{%
\expandafter\let\csname @@\string#1\endcsname#1%
\edef#1{%
\noexpand\@latex@e@error{\noexpand#2}%
\expandafter\noexpand\csname @@\string#1\endcsname
}%
}
\@tempa\usepackage\usepackage
\@tempa\listfiles\listfiles
\@tempa\ensuremath\ensuremath
\@tempa\lrbox{\begin{lrbox}}%
\@tempa\@xargdef{\newcommand{cmd}[args][def]}%
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \changes{v0.22}{1994/05/02}
% {Added \cs{if@latex@e@errors} and \cs{@@@}.}
% \changes{v0.24}
% {1994/05/14}{Removed \cs{if@latex@e@errors} and \cs{@@@}.}
% \changes{v0.24}{1994/05/14}{Changed the error help.}
% \changes{v0.36}{1994/10/17}{Initialized \cs{@latex@e@error} to do
% nothing, and switched it on at the begin document.}
%
% \begin{macro}{\@latex@e@error}
% \begin{macro}{\@latex@e@error@}
% This error is produced if a user uses a \LaTeXe{} command in
% compatibility mode. This is to encourage users to move over to
% using |\documentclass| as quickly as possible. During the preamble
% the error does nothing (so that packages can use \LaTeXe{} commands)
% but it is redefined to be an error message at |\begin{document}|.
% \begin{macrocode}
\let\@latex@e@error\@gobble
\def\@latex@e@error@#1{%
\@latexerr{%
LaTeX2e command \string#1\space in LaTeX 2.09 document%
}{%
This is a LaTeX 2.09 document, but it contains
\string#1.^^J%
If you want to use the new features of LaTeX2e,
your document^^J%
should begin with \string\documentclass\space
rather than \string\documentstyle
}%
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \changes{v0.36}{1994/10/17}
% {Allow 2e commands to be redefined once with \cs{newcommand}.}
% \changes{v0.40}{1995/03/21}{
% (DPC) Add \cs{r} to the list of 2e commands latex/1424}
%
% \begin{macro}{\@ifdefinable}
% \begin{macro}{\@old@ifdefinable}
% \begin{macro}{\@@ifdefinable}
% \begin{macro}{\@latex@e@commands}
% We trap the |\@notdefinable| error message to check to see if the
% command is a \LaTeXe{} command, in which case we allow the
% definition to happen. We keep a list of commands which are
% allowed to be redefined this way in |\@latex@e@commands|, and
% remove an entry each time it is defined.
% \begin{macrocode}
\let\@old@ifdefinable\@ifdefinable
\long\def\@ifdefinable#1{%
\def\@tempa##1#1##2#1##3#1##4\@tempa{%
\def\@latex@e@commands{##1##2}%
##3% ##3 will either be \iftrue or \iffalse
\expandafter\@firstofone
\else
\expandafter\@old@ifdefinable\expandafter#1%
\fi
}%
\expandafter\@tempa\@latex@e@commands#1\iftrue#1\iffalse#1\@tempa%
}
\let\@@ifdefinable\@ifdefinable
\def\@latex@e@commands{%
\usepackage\listfiles\ensuremath\LaTeXe\lrbox
\th\dh\ng\dj\TH\DH\NG\DJ\k\r\SS
\guillemetleft\guillemetright
\guillemotleft\guillemotright\guilsinglleft
\guilsinglright\quotedblbase\quotesinglbase
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@begin@tempboxa}
% \changes{v0.22}{1994/05/02}{Commented out the redefinition of
% \cs{@begin@tempboxa}.}
% If we were to switch off the new |\width|, |\height| and |\depth|
% commands, this is how to do it. This isn't done, since these
% commands may be used in packages.
% \begin{verbatim}
%\long\def\@begin@tempboxa#1#2{%
% \begingroup
% \setbox\@tempboxa#1{{#2}}}
% \end{verbatim}
% \end{macro}
%
% \subsection{Document class hook}
%
% \begin{macro}{\@documentclasshook}
% \changes{v0.15}{1994/02/10}{Renamed from \cs{@compatibility} to
% \cs{@documentclasshook}. Added the check for \cs{@normalsize} and
% \cs{normalsize} being defined.}
% \changes{v0.22}{1994/05/02}{Moved switching off commands into the
% document class hook.}
% \changes{v0.24}{1994/05/14}{Switched the box commands back on, for use
% in packages.}
% \changes{v0.36}{1994/10/17}{Changed the way the 2e command error is
% activated.}
% \changes{v0.51}{1996/05/24}{(DPC) Reimplemented for /2153.}
% This macro is called by each use of |\documentclass|. We define
% it to define |\@normalsize| and |\normalsize| if necessary,
% to input each unused option as a package, and to switch off the new
% \LaTeXe{} commands. However, we leave on the commands
% |\settoheight|, |\settowidth| and the new options to |\parbox| and
% |\minipage|, since these are likely to be used in packages.
%
% The intention of the strange |\normalsize| tests below are that after
% the |\documentstyle| command has completed, then
% if neither of the commands |\normalsize|
% nor |\@normalsize| were defined by the main style or one of its
% `substyles' or `options', then |\@normalsize| will be undefined and
% |\normalsize| will generate an error saying it hasn't been defined.
%
% If the style defined either |\normalsize| or \@|normalsize| then
% these two commands will be |\let| equal to each other, with the
% definition given by the style file.
%
% If the style defines both |\normalsize| and |\@normalsize| then
% those two definitions are kept.
% \begin{macrocode}
\def\@documentclasshook{%
\RequirePackage\@unusedoptionlist
\let\@unusedoptionlist\@empty
\def\@tempa{\@normalsize}%
\ifx\normalsize\@tempa
\let\normalsize\@normalsize
\fi
\ifx\@normalsize\@undefined
\let\@normalsize\normalsize
\fi
\ifx\normalsize\@undefined
\let\normalsize\original@normalsize
\fi
\let\@latex@e@error\@latex@e@error@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\original@normalsize}
% \changes{v0.51}{1996/05/24}{(DPC) Macro added /2153.}
% Save the original definition of |\normalsize| (which generates an
% error)
% \begin{macrocode}
\let\original@normalsize\normalsize
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\normalsize}
% \changes{v0.14}{1994/02/07}{Added \cs{normalsize}.}
% Some styles don't define |\normalsize|, just |\@normalsize|.
% \begin{macrocode}
\def\normalsize{\@normalsize}
% \end{macrocode}
% \end{macro}
%
% \subsection{Compatibility with \LaTeX~2.09 document styles}
%
% \begin{macro}{\@missingfileerror}
% If a |.cls| file is missing, we look to see if there is
% a file of the same name with a |.sty| extension.
% \changes{v0.06}{1993/12/18}{Corrected a typo
% \cs{@saved@missingfileerror}
% should have been \cs{saved@missingfileerror}.}
% \changes{v0.07}{1993/12/18}{Corrected a typo, I'd forgotten to pass
% the arguments of \cs{@missingfileerror} on to
% \cs{saved@missingfileerror}.}
% \changes{v0.29}{1994/05/17}{Removed extraneous spaces.}
% \begin{macrocode}
\@ifundefined{saved@missingfileerror}{
\let\saved@missingfileerror=\@missingfileerror
}{}
\def\@missingfileerror#1#2{%
\ifx#2\@clsextension
\InputIfFileExists{#1.\@pkgextension}{%
\wlog{Compatibility mode: loading #1.\@pkgextension
\space rather than #1.#2.}%
}{%
\saved@missingfileerror{#1}{#2}%
}%
\else
\saved@missingfileerror{#1}{#2}%
\fi
}
\@ifundefined{@missing@onefilewithoptions}{}{%
\def\@missing@onefilewithoptions#1{%
\@pass@ptions\@currext{#1}{\@currname}%
\@missingfileerror\@currname\@currext
\let\@currname\@empty}%
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@obsoletefile}
% For compatibility with the document styles which |\input| the
% standard \LaTeX~2.09 document styles, we distribute
% files called |article.sty|, |book.sty|, |report.sty|,
% |slides.sty| and |letter.sty|. These use the command
% |\@obsoletefile|, which the \LaTeXe{} kernel defines to produce a
% warning message. We redefine it to just produce a message in the
% log file, and to pass any options from the old filename to the
% new filename.
% \changes{v0.08}{1993/12/19}{Added this command.}
% \changes{v0.10}{1994/01/14}{Added the option-passing.}
% \begin{macrocode}
\def\@obsoletefile#1#2{%
\expandafter\let\csname opt@#1\expandafter\endcsname
\csname opt@\@currname.\@currext\endcsname
\wlog{Compatibility mode: inputting `#1'
instead of obsolete `#2'.}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\footheight}
% \begin{macro}{\@maxsep}
% \begin{macro}{\@dblmaxsep}
% \LaTeX~2.09 supported these parameters, so for compatibility with
% old document styles we allocate them.
% \changes{v0.16}{1994/02/11}{Replaced the allocation of temporary
% dimens for \cs{footheight}, \cs{@maxsep} and \cs{@dblmaxsep} by
% real dimen variables.}
% \begin{macrocode}
\newdimen\footheight
\newdimen\@maxsep
\newdimen\@dblmaxsep
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \changes{v0.36}{1994/10/17}{Added an empty \cs{mark}.}
% \changes{v0.37}
% {1994/10/20}{Corrected a type with the empty \cs{mark}.}
%
% \begin{macro}{\mark}
% \LaTeX~2.09 initialized an empty mark. Who knows, someone may have
% relied on it:
% \begin{macrocode}
\mark{{}{}}
% \end{macrocode}
% We mimic this also for the new mark mechanism (in a low-level
% way): marks 1,2, and 3 correspond to 2e-left, 2e-right, and
% 2e-right-noempty.
% \begin{macrocode}
\ExplSyntaxOn
\marks1{\__mark_value:nn {2.09-compat}{}}
\marks2{\__mark_value:nn {2.09-compat}{}}
\marks3{\__mark_value:nn {2.09-compat}{}}
\ExplSyntaxOff
% \end{macrocode}
% \end{macro}
%
% \subsection{Layout}
%
% \begin{macro}{\sloppy}
% \changes{v0.06}{1993/12/18}{Added \cs{sloppy}}
% There is a new version of |\sloppy| in \LaTeXe, so we restore the
% old one.
% \begin{macrocode}
\def\sloppy{\tolerance \@M \hfuzz .5\p@ \vfuzz .5\p@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@finalstrut}
% \changes{v0.30}{1994/05/18}{Added \cs{@finalstrut}.}
% \changes{v0.31}{1994/05/20}{New definition of \cs{@finalstrut}.}
% The strut which is used in a footnote has changed. This restores
% the old definition.
% \begin{macrocode}
\def\@finalstrut#1{\unskip\strut}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@marginparreset}
% \begin{macro}{\@floatboxreset}
% \changes{v0.39}{1994/11/28}{Added old behaviour of floats and space.}
% \changes{v0.45}{1995/05/25}{(CAR) Changed method of restoring
% old behaviour of floats and space.}
% Restore the old spacing around floats.
% \begin{macrocode}
\let \@marginparreset \@empty
\let \@floatboxreset \@empty
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\proclaim}
% \changes{v0.41}{1995/04/24}
% {Move here from ltplain.dtx}
% From plain \TeX.
% \begin{macrocode}
\outer\def\proclaim #1. #2\par{%
\medbreak
\noindent{\bfseries#1.\enspace}{\slshape#2\par}%
\ifdim\lastskip<\medskipamount
\removelastskip\penalty55\medskip
\fi}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\hang}
% \begin{macro}{\textindent}
% \changes{v0.42}{1995/04/27}
% {Move here from ltplain.dtx}
% From plain \TeX.
% \begin{macrocode}
\def\hang{\hangindent\parindent}
\def\textindent#1{\indent\llap{#1\enspace}\ignorespaces}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \begin{macro}{\ttraggedright}
% \changes{v0.41}{1995/04/24}
% {Move here from ltplain.dtx}
% \begin{macrocode}
\def\ttraggedright{\reset@font\ttfamily\rightskip\z@ plus2em\relax}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\@footnotemark}
% \changes{v0.43}{1995/05/12}
% {macro added}
% \LaTeXe\ version has |\nobreak| to allow hyphenation.
% \begin{macrocode}
\def\@footnotemark{%
\leavevmode
\ifhmode\edef\@x@sf{\the\spacefactor}\fi
\@makefnmark
\ifhmode\spacefactor\@x@sf\fi
\relax}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@textsuperscript}
% \changes{v0.48}{1995/07/07}
% {macro added for latex/1722}
% Fudge this command to remove the text font command which
% is always the first thing in the argument. This is needed
% as in compatibility mode footnotes are processed in math mode,
% but the standard classes call |\@textsuperscript| in the definition
% of |\thanks|.
% \begin{macrocode}
\def\@textsuperscript#1{$\m@th^{\@gobble#1}$}
% \end{macrocode}
% \end{macro}
%
%
%
% \begin{macro}{\@makefnmark}
% \changes{v0.44}{1995/05/20}{macro added}
% \LaTeXe\ version uses |\textsuperscript| rather than
% math mode.
% \begin{macrocode}
\def\@makefnmark{\hbox{$^{\@thefnmark}\m@th$}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\thempfootnote}
% \changes{v0.44}{1995/05/20}{macro added}
% \LaTeXe\ version has an additional |\itshape| which would not
% work (and would not make sense) in math mode.
% \begin{macrocode}
\def\thempfootnote{\@alph\c@mpfootnote}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@fnsymbol}
% \changes{v0.46}{1995/06/30}{macro added}
% \LaTeX\ version uses |\ensuremath| which does not work in
% compatibility mode.
% \begin{macrocode}
\def\@fnsymbol#1{\ifcase#1\or *\or \dagger\or \ddagger\or
\mathchar "278\or \mathchar "27B\or \|\or **\or \dagger\dagger
\or \ddagger\ddagger \else\@ctrerr\fi}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@inmathwarn}
% \changes{v0.50}{1995/12/08}{Switched off \cs{@inmathwarn}}
% \LaTeX\ (1995/12/01) checks for text commands being used in math
% mode. We switch this off in compatibility mode.
% \begin{macrocode}
\let\@inmathwarn\@gobble
% \end{macrocode}
% \end{macro}
%
% \subsection{Verbatim}
%
% \changes{v0.18}{1994/03/11}{Added the changes to \cs{verb}}
% \changes{v0.40}{1995/05/05}{Make \cs{verb} use \cs{tt} font in
% math mode.}
% \begin{macro}{\verb}
% \begin{macro}{\@sverb}
% We restore the old definition of |\verb|, but using
% |\verbatim@font| rather than |\tt|. The use of |\bgroup| and
% |\egroup| allows us to prefix it with |\hbox| in math mode.
% \begin{macrocode}
\def\verb{%
\relax\ifmmode\hbox\fi\bgroup
\@noligs
\verbatim@font
\let\do\@makeother \dospecials
\@ifstar{\@sverb}{\@verb}%
}
\def\@sverb#1{%
\def\@tempa ##1#1{\leavevmode\null##1\egroup}%
\@tempa
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\verbatim@nolig@list}
% \changes{v0.20}{1994/04/20}{Added the redefinition of
% \cs{verbatim@nolig@list}.}
% The only ligatures which should be switched off in 2.09 mode are
% the Spanish punctuation.
% \begin{macrocode}
\def\verbatim@nolig@list{\do\`}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@lquote}
% \changes{v0.21}{1994/04/24}{Added the definition of \cs{@lquote}.}
% We restore the old definition of |\@lquote| in case any packages
% use it.
% \begin{macrocode}
\def\@lquote{\leavevmode{\kern\z@}`}
% \end{macrocode}
% \end{macro}
%
%
% \subsection{Character codes}
%
% \changes{v0.18}{1994/03/11}{Added the catcode changes}
%
% By default, \LaTeXe{} makes the input characters 0--8, 11, 14--31 and
% 128--255 illegal. In compatibility mode, we restore their old
% meanings.
% \begin{macrocode}
\catcode0=9
\@tempcnta=1
\loop\ifnum\@tempcnta<32
\catcode\@tempcnta=12
\advance\@tempcnta by 1
\repeat%
\catcode`\^^I=10\relax%
\catcode`\^^L=13\relax%
\catcode`\^^M=5\relax%
\catcode127=15
\@tempcnta=128
\loop\ifnum\@tempcnta<256
\catcode\@tempcnta=12
\advance\@tempcnta by 1
\repeat
% \end{macrocode}
%
% \subsection{Miscellaneous commands}
%
% \begin{macro}{\SLiTeX}
% The \textsc{Sli\TeX} logo.
% \begin{macrocode}
\DeclareRobustCommand{\SLiTeX}{{%
\normalfont S\kern -.06em
{\scshape l\kern -.035emi}\kern -.06em
\TeX}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\+}
% The |\+| command should be defined, so that it can be used in
% |\renewcommand|.
% \begin{macrocode}
\let\+\@empty
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@cla}
% \begin{macro}{\@clb}
% \changes{v0.47}{1995/09/25}
% {(DPC) Declare old \cs{cline} registers}
% \begin{macro}{\mscount}
% \LaTeX2.09 (and early versions of \LaTeXe) used these count registers
% in the definition of |\cline| and |\multispan|.
% Declare them here in case they were used for any other purposes.
% \begin{macrocode}
\newcount\@cla
\newcount\@clb
\newcount\mscount
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@imakepicbox}
% \changes{v0.48}{1995/10/16}
% {(DPC) emulate old behaviour of picture mode makebox}
% picture mode version
% \begin{macrocode}
\long\def\@imakepicbox(#1,#2)[#3]#4{%
\vbox to#2\unitlength
{\let\mb@b\vss \let\mb@l\hss\let\mb@r\hss
\let\mb@t\vss
\@tfor\reserved@a :=#3\do{%
\if s\reserved@a
\let\mb@l\relax\let\mb@r\relax
\else
\expandafter\let\csname mb@\reserved@a\endcsname\relax
\fi}%
\mb@t
\hb@xt@ #1\unitlength{\mb@l #4\mb@r}%
\mb@b
% \end{macrocode}
% This kern ensures that a |b| option aligns on the bottom of the
% text rather than the baseline. this is the documented behaviour in
% the \LaTeX Book. The kern is removed in compatibility mode.
%
% Remove kern for bug compatibility with 2.09.
% \begin{macrocode}
% \kern\z@
}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\supereject}
% \begin{macrocode}
\def\supereject{\par\penalty-\@MM}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\nofiles}
% \changes{v0.51}{1996/05/24}{(DPC) Old definition, without \cs{write}
% added to \cs{protected@write}, for latex/2146}
% This old version might change the vertical spacing when it is used.
% Some old document might depend on that changed spacing so\ldots
% \begin{macrocode}
\def\nofiles{%
\@fileswfalse
\typeout{No auxiliary output files.^^J}%
\long\def\protected@write##1##2##3{}%
\let\makeindex\relax
\let\makeglossary\relax}
% \end{macrocode}
% \end{macro}
%
% \subsection{Packages and classes}
%
% \begin{macro}{\ProvidesPackage}
% \begin{macro}{\ProvidesClass}
% We redefine |\ProvidesPackage| and |\ProvidesClass| to produce a
% log message rather than a warning if they find an unexpected
% file.
% \begin{macrocode}
\def\ProvidesPackage#1{%
\xdef\@gtempa{#1}%
\ifx\@gtempa\@currname\else
\wlog{Compatibility mode: \@cls@pkg\space`\@currname' requested,
but `#1' provided.}%
\fi
\@ifnextchar[\@pr@videpackage{\@pr@videpackage[]}}%]
\let\ProvidesClass=\ProvidesPackage
% \end{macrocode}
% \end{macro}
% \end{macro}
% That ends the head of |latex209.def|.
% \begin{macrocode}
%</head>
% \end{macrocode}
%
% \section{Middle of latex209.def}
%
% At this point, the code for |oldlfont.sty| is read in by the
% installation script.
%
% \section{End of latex209.def}
%
% This section describes the end of |latex209.def|.
% \begin{macrocode}
%<*tail>
% \end{macrocode}
%
% \subsection{Font commands}
%
% \changes{v0.12}{1994/01/24}{Added the oldlfont option.}
% \changes{v0.25}{1994/05/14}{Added the newlfont option, rewrote the
% oldlfont option to change math grouping.}
% \changes{v0.26}{1994/05/15}{Added the margid and nomargid options.}
% \changes{v0.27}{1994/05/16}{Replaced \# by \#\# in margid.}
% \changes{v0.28}{1994/05/17}{Replaced \cs{input} newlfont.sty by
% \cs{OptionNotUsed} in \cs{ds@newlfont}.}
%
% \begin{macro}{\ds@oldlfont}
% \begin{macro}{\ds@newlfont}
% \begin{macro}{\ds@margid}
% \begin{macro}{\ds@nomargid}
% We declare |oldlfont|, |newlfont|, |margid| and |nomargid|
% options to mimic the \LaTeX~2.09 NFSS1 options.
% \begin{macrocode}
\def\ds@oldlfont{%
%FM \@no@font@optfalse
\let\math@bgroup\@empty
\let\math@egroup\@empty
\let\@@math@bgroup\math@bgroup
\let\@@math@egroup\math@egroup
}
\def\ds@newlfont{%
%FM \@no@font@optfalse
\OptionNotUsed
}
\def\ds@margid{%
%FM \@no@font@optfalse
\let\math@bgroup\bgroup
\def\math@egroup##1{##1\egroup}%
\let \@@math@bgroup \math@bgroup
\let \@@math@egroup \math@egroup
}
\let\ds@nomargid\ds@oldlfont
\@onlypreamble\ds@oldfont
\@onlypreamble\ds@newfont
\@onlypreamble\ds@margid
\@onlypreamble\ds@nomargid
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\encodingdefault}
% The default encoding for old documents is OT1 rather than T1.
% \begin{macrocode}
\renewcommand{\encodingdefault}{OT1}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\cmex/m/n/10}
% Just in case a document style relies on |\cmex/m/n/10| to exist
% (which may have been hard-wired to |\fam3|) we load the font.
% \begin{macrocode}
\expandafter\font\csname cmex/m/n/10\endcsname=cmex10
% \end{macrocode}
% \end{macro}
%
%
% \changes{v0.12}{1994/01/24}
% {Added \cs{normalshape} and \cs{mediumseries}.}
% \changes{v0.28}{1994/05/16}{\cs{mediumseries} was using
% \cs{fontshape} rather than \cs{fontseries}.}
%
% \begin{macro}{\normalshape}
% \begin{macro}{\mediumseries}
% These commands were used in older versions of NFSS.
% \begin{macrocode}
\def\normalshape{\fontshape\shapedefault\selectfont}
\def\mediumseries{\fontseries\seriesdefault\selectfont}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \begin{macro}{\DeclareOldFontCommand}
% We redefine |\DeclareOldFontCommand| to do nothing. This means
% that any new document classes will have their redefinitions of
% |\rm|, |\bf| etc.~ignored.
% \changes{v0.06}{1993/12/18}{Replaced \cs{@newfontswitch} by
% \cs{@renewfontswitch}.}
% \changes{v0.11}{1994/01/21}{Removed \cs{RequirePackage}{oldlfont}.}
% \changes{v0.19}{1994/04/05}{Replaced \cs{@renewfontswitch} by
% \cs{DeclareOldFontCommand}.}
% \begin{macrocode}
\def \DeclareOldFontCommand #1#2#3{%
\wlog{Compatibility mode: definition
of \string#1\space ignored.}%
}
% \end{macrocode}
% \end{macro}
%
% \changes{v0.17}
% {1994/03/02}{Added \cs{@halfmag}, \cs{@magscale} and \cs{@ptscale}}
% \changes{v0.35}
% {1994/09/23}{Added spaces to the old font scale commands.}
%
% \begin{macro}{\@halfmag}
% \begin{macro}{\@magscale}
% \begin{macro}{\@ptscale}
% Some font-specifying commands from \LaTeX~2.09.
% \begin{macrocode}
\def\@halfmag{ scaled \magstephalf}
\def\@magscale#1{ scaled \magstep#1 }
\def\@ptscale#1{ scaled #100 }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\font}
% The current font is set to be CMR 10pt, to match \LaTeX~2.09.
% \begin{macrocode}
\fontencoding{OT1} \fontfamily{cmr}
\fontsize{10}{12} \fontseries{m} \fontshape{n}
\selectfont
% \end{macrocode}
% \end{macro}
%
% \changes{v0.11}{1994/01/21}{Added the rest of this subsection, which
% used to be in oldlfont.dtx.}
%
% \begin{macro}{\load}
% The |\load| command is no longer needed, it is therefore
% defined to do nothing.
% \begin{macrocode}
\let\load\@gobbletwo
% \end{macrocode}
% \end{macro}
%