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+% \iffalse meta-comment
+%
+% Copyright 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
+% The LaTeX3 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 1.3
+% 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 1.3 or later is part of all distributions of LaTeX
+% version 2003/12/01 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
+%
+% \iffalse
+%%% From File: ltfiles.dtx
+%<*driver>
+% \fi
+\ProvidesFile{ltfiles.dtx}
+ [1997/10/06 v1.1l LaTeX Kernel (File Handling)]
+% \iffalse
+\documentclass{ltxdoc}
+\GetFileInfo{ltfiles.dtx}
+\title{\filename}
+\date{\filedate}
+ \author{%
+ Johannes Braams\and
+ David Carlisle\and
+ Alan Jeffrey\and
+ Leslie Lamport\and
+ Frank Mittelbach\and
+ Chris Rowley\and
+ Rainer Sch\"opf}
+
+\begin{document}
+\maketitle
+ \DocInput{\filename}
+\end{document}
+%</driver>
+% \fi
+%
+% \CheckSum{572}
+%
+% \changes{v1.0h}{1994/05/21}{Use new error commands}
+% \changes{v1.0n}{1994/11/17}
+% {\cs{@tempa} to \cs{reserved@a}}
+% \changes{v1.0u}{1995/07/13}{Updates to docu}
+%
+% \section{File Handling}
+%
+% The following user commands are defined in this part:
+%
+% \DescribeMacro{\document} (ie |\begin{document}|)\\
+% Reads in the .AUX files and |\catcode|'s |@| to 12.
+%
+% \DescribeMacro{\nofiles}\\
+% Suppresses all file output by setting |\@filesw| false.
+%
+% \DescribeMacro{\includeonly}\marg{NAME1, ... ,NAMEn}\\
+% Causes only parts NAME1, ... ,NAMEn to be read by
+% their |\include| commands. Works by setting \@partsw true
+% and setting |\@partlist| to NAME1, ... ,NAMEn.
+%
+% \DescribeMacro{\include}\marg{NAME}\\
+% Does an |\input| NAME unless |\@partsw| is true and
+% NAME is not in |\@partlist|. If |\@filesw| is true, then
+% it directs .AUX output to NAME.AUX, including a
+% checkpoint at the end.
+%
+% \DescribeMacro{\input}\marg{NAME}\\
+% The same as TeX's |\input|, except it allows optional
+% braces around the file name. In \LaTeXe, it also avoids
+% the primitive `missing file' error, if the file can not be
+% found.
+%
+% \DescribeMacro{\IfFileExists}\marg{NAME}\marg{then}\marg{else}\\
+% If the file exists on the system, execute \emph{then} otherwise
+% execute \emph{else}.
+%
+% \DescribeMacro{\InputIfFileExists}\marg{NAME}\marg{then}\marg{else}\\
+% If the file exists on the system, execute \emph{then} and input
+% \emph{NAME} otherwise execute \emph{else}.
+%
+% \StopEventually{}
+%
+% \changes{v1.0a}{1994/03/07}{Initial version, split from latex.dtx}
+% \changes{v1.0a}{1994/03/07}{Long lines wrapped to 72 columns}
+%
+% \begin{oldcomments}
+%
+% \begin{macrocode}
+%<*2ekernel|autoload>
+\message{files,}
+% \end{macrocode}
+%
+% VARIABLES, SWITCHES AND INTERNAL COMMANDS:
+% \@mainaux : Output file number for main .AUX file.
+% \@partaux : Output file number for current part's .AUX file.
+% \@auxout : Either \@mainout or \@partout, depending on
+% which .AUX file output goes to.
+% \@input{foo} : If file foo exists, then \input's it,
+% otherwise types a warning message.
+% @filesw : Switch -- set false if no .AUX, .TOC, .IDX etc
+% files are to be written
+% @partsw : Set true by a \includeonly command.
+% \@partlist : Set to the argument of the \includeonly command.
+%
+% \cp@FOO : The checkpoint for \include'd file FOO.TEX, written
+% by \@writeckpt at the end of file FOO.AUX
+%
+%
+% \includeonly{FILELIST} ==
+% BEGIN
+% \@partsw := T
+% \@partlist := FILELIST
+% END
+%
+% \include{FILE} ==
+% BEGIN
+% \clearpage
+% if \@filesw = T
+% then \immediate\write\@mainaux{\string\@input{FILE.AUX}}
+% fi
+% if \@partsw = T
+% then \@tempswa := F
+% \reserved@b == FILE
+% for \reserved@a := \@partlist
+% do if eval(\reserved@a) = eval(\reserved@b)
+% then \@tempswa := T fi
+% od
+% fi
+%
+% if \@tempswa = T
+% then \@auxout := \@partaux
+% if \@filesw = T
+% then \immediate\openout\@partaux{FILE.AUX}
+% \immediate\write\@partaux{\relax}
+% fi
+% \@input{FILE.TEX}
+% \clearpage
+% \@writeckpt{FILE}
+% if @filesw then \closeout \@partaux fi
+% \@auxout := \@mainaux
+% else \cp@FILE
+% fi
+% END
+%
+% \@writeckpt{FILE} ==
+% BEGIN
+% if \@filesw = T
+% \immediate\write on file \@partaux:
+% \@setckpt{FILE}{ %% }
+% for \reserved@a := \cl@@ckpt
+% do \immediate\write on file \@partaux:
+% \global\string\setcounter
+% {eval(\reserved@a)}{eval(\c@eval(\reserved@a))}
+% od %% {
+% \immediate\write on file \@partaux: }
+% fi
+% END
+%
+% \@setckpt{FILE}{LIST} ==
+% BEGIN
+% G \cp@FILE := LIST
+% END
+%
+% INITIALIZATION
+% \@tempswa := T
+%
+% \end{oldcomments}
+%
+%
+% \task{???}{Do we use @unused or mainaux?}
+% \begin{macro}{\@inputcheck}
+% \begin{macro}{\@unused}
+% Allocate read stream for testing and output stream.
+% \changes{v1.0l}{1994/11/07}
+% {move here from ltdefns, remove duplicate \cs{@mainaux}}
+% \begin{macrocode}
+\newread\@inputcheck
+\newwrite\@unused
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\@mainaux}
+% \begin{macro}{\@partaux}
+% \begin{macrocode}
+\newwrite\@mainaux
+\newwrite\@partaux
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\if@filesw}
+% \begin{macro}{\if@partsw}
+% \begin{macrocode}
+\newif\if@filesw \@fileswtrue
+\newif\if@partsw \@partswfalse
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\@clubpenalty}
+% This stores the current normal (non-infinite) value of
+% \cs{clubpenalty}; it should therefore be reset whenever the
+% normal value is changed (as in the bibliography in the standard
+% styles).
+% \changes{v1.1h}{1996/10/05}{Added setting its value}
+% \begin{macrocode}
+\newcount\@clubpenalty
+\@clubpenalty \clubpenalty
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\document}
+% \changes{v0.9e}{1993/12/09}{Hook added}
+% Cancel the |\begingroup| from |\begin|
+% \begin{macrocode}
+\def\document{\endgroup
+% \end{macrocode}
+% If some options on |\documentclass| haven't been used by any
+% package we will now give a warning since this is most certainly a
+% misspelling.
+% \begin{macrocode}
+ \ifx\@unusedoptionlist\@empty\else
+ \@latex@warning@no@line{Unused global option(s):^^J%
+ \@spaces[\@unusedoptionlist]}%
+ \fi
+ \@colht\textheight
+ \@colroom\textheight \vsize\textheight
+ \columnwidth\textwidth
+ \@clubpenalty\clubpenalty
+ \if@twocolumn
+ \advance\columnwidth -\columnsep
+ \divide\columnwidth\tw@ \hsize\columnwidth \@firstcolumntrue
+ \fi
+ \hsize\columnwidth \linewidth\hsize
+ \begingroup\@floatplacement\@dblfloatplacement
+ \makeatletter\let\@writefile\@gobbletwo
+% \end{macrocode}
+% \changes{v1.1a}{1995/10/24}
+% {Removed multiplelabels switch}
+% \begin{macrocode}
+ \global \let \@multiplelabels \relax
+ \@input{\jobname.aux}%
+ \endgroup
+ \if@filesw
+ \immediate\openout\@mainaux\jobname.aux
+ \immediate\write\@mainaux{\relax}%
+ \fi
+% \end{macrocode}
+%
+% Dateline 1991/03/26: FMi added |\process@table| to support NFSS;
+% This will also work with old lfonts if no other style defines
+% |\process@table|. The following line forces the initialization of
+% the math fonts.
+% \begin{macrocode}
+ \process@table
+ \let\glb@currsize\@empty %% Force math initialization.
+% \end{macrocode}
+% \changes{v0.9t}{1994/01/31}
+% {set \cs{@normalsize} or \cs{normalsize} if necessary}
+% \changes{v1.0d}{1994/03/28}
+% {(DPC) remove \cs{@normalsize check}}
+% \changes{v1.0d}{1994/03/28}
+% {(DPC) Use \cs{normalsize} not \cs{@normalsize}}
+% \changes{v1.0g}{1994/05/13}{Added execution of \cs{every@size}}
+% \changes{v1.0m}{1994/11/07}{Renamed \cs{every@size} to
+% \cs{every@math@size}.}
+% \changes{v1.0q}{1995/04/25}
+% {Removed execution of \cs{every@size} latex/1407}
+% \begin{macrocode}
+ \normalsize
+ \everypar{}%
+% \end{macrocode}
+%
+% So that punctuation in headings is not disturbed by verbatim
+% or other local changes to the space factor codes, save the document
+% default here. This will be locally reset by the output routine.
+% For special cases a class may want to define |\normalsfcodes|
+% directly, in case that definition will be used.
+% (This is an old bug, problem existed in \LaTeX2.0x and plain \TeX.)
+% \changes{v1.1k}{1997/04/14}
+% {Set the document space factor defaults. latex/2404}
+% \begin{macrocode}
+ \ifx\normalsfcodes\@empty
+ \ifnum\sfcode`\.=\@m
+ \let\normalsfcodes\frenchspacing
+ \else
+ \let\normalsfcodes\nonfrenchspacing
+ \fi
+ \fi
+% \end{macrocode}
+% Way back in 1991 (08/26) FMi \& RmS set the |\@noskipsec| switch
+% to true in the preamble and to false here.
+% This was done to trap lists and related text in the preamble but it
+% does not catch everything; hence Change 1.1g was introduced.
+% \begin{macrocode}
+ \@noskipsecfalse
+% \end{macrocode}
+% \changes{v1.1a}{1995/10/24}
+% {Removed refundefined switch}
+% \begin{macrocode}
+ \let \@refundefined \relax
+% \end{macrocode}
+% Just before disabling the preamble commands we execute the begin
+% document hook which contains any code contributed by
+% |\AtBeginDocument|. Also disable the gathering of the file list,
+% if no |\listfiles| has been issued. |\AtBeginDocument| is redefined
+% at this point so that and such commands that get into the hook do
+% not chase their tail\ldots
+% \changes{v1.1e}{1996/04/24}
+% {(DPC) Reset \cs{AtBeginDocument} eg for latex/1297}
+% \begin{macrocode}
+ \let\AtBeginDocument\@firstofone
+ \@begindocumenthook
+% \end{macrocode}
+% Most of the following assignments will be done globally in case
+% the user adds something like |\begin{multicols}| to the document
+% hook, i.e. starts are group in |\begin{document}|.
+% \changes{v1.0r}{1995/04/27}
+% {Added \cs{global} to support groups in hook}
+% \changes{v1.0c}{1994/03/16}
+% {(DPC) directly add file list settings}
+% \changes{v1.0v}{1995/08/16}{set \cs{topskip} globally}
+% \changes{v1.0v}{1995/08/16}{set \cs{@maxdepth}}
+%
+% \changes{v1.0s}{1995/05/25}
+% {Added check for \cs{topskip} zero}
+% \changes{v1.0t}{1995/05/25}
+% {Corrected typo}
+% Since a value of exactly 0pt for \cs{topskip} causes
+% \cs{twocolumn[]} to misbehave, we add this check, hoping
+% that it will not cause any problems elsewhere.
+% \begin{macrocode}
+ \ifdim\topskip<1sp\global\topskip 1sp\relax\fi
+ \global\@maxdepth\maxdepth
+ \global\let\@begindocumenthook\@undefined
+ \ifx\@listfiles\@undefined
+ \global\let\@filelist\relax
+ \global\let\@addtofilelist\@gobble
+ \fi
+% \end{macrocode}
+% At the very end we disable all preamble commands. This has to
+% happen after the begin document hooks was executed so that this
+% hook can still use such commands.
+% \changes{v0.9o}{1994/01/15}
+% {move \cs{@preamblecmds} after document hook}
+% \changes{v1.0v}{1995/08/16}{set \cs{do} globally}
+% \begin{macrocode}
+ \gdef\do##1{\global\let ##1\@notprerr}%
+ \@preamblecmds
+% \end{macrocode}
+% The next line saves tokens and also allows |\@nodocument| to be
+% used directly to trap preamble errors.
+% \changes{v1.1g}{1996/09/29}{Added disabling of \cs{@nodocument}}
+% \begin{macrocode}
+ \global\let \@nodocument \relax
+% \end{macrocode}
+% The next line is a pure safety measure in case a do list is ever
+% expanded at the wrong place. In addition it will save a few
+% tokens to get rid of the above definition.
+% \begin{macrocode}
+ \global\let\do\noexpand
+% \end{macrocode}
+% \changes{v1.1c}{1995/12/05}{\cs{ignorespaces} added for latex/1933}
+% Use of |\AtBeginDocument| hook might mean that we are already in
+% horizontal mode, so ignore the space after |\begin{document}|.
+% \begin{macrocode}
+ \ignorespaces}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\@onlypreamble\document
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\normalsfcodes}
+% \changes{v1.1k}{1997/04/14}
+% {Macro added (from patch file) latex/2404}
+% The setting of |\@empty| is just a flag. This command may be defined
+% in a class or package file. If it is still |\@empty| at
+% |\begin{document}| it will be defined to be |\frenchspacing| or
+% |\nonfrenchspacing|, depending on which of those appears to be in
+% effect at that point.
+% \begin{macrocode}
+\let\normalsfcodes\@empty
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\nofiles}
+% \changes{v1.0k}{1994/11/04}
+% {Added setting of \cs{protected@write},
+% \cs{makeindex} and \cs{makeglossary} to \cs{nofiles}. ASAJ.}
+% \changes{v1.0o}{1994/11/30}
+% {There is no \cs{@gobblethree}\ldots}
+% \changes{v1.0t}{1995/05/25}
+% {(CAR) added \cs{long}}
+% \changes{v1.1f}{1996/05/17}
+% {added \cs{write} to \cs{protected@write} for latex/2146}
+% Set |\@fileswfalse| which suppresses the places where \LaTeX\ makes
+% |\immediate| writes. The |\makeindex| and |\makeglossary| are
+% disabled. |\protected@write| is redefined not to write to the file
+% specified, but rather to write a blank line to the log file. This
+% ensures that a \meta{whatsit} node is still created, and so spacing
+% is not affected by the |\nofiles| command; to ensure this more
+% generally, the |\if@nobreak| test is needed.
+% \changes{v1.1i}{1996/11/05}
+% {Standard \cs{if@nobreak} test added}
+% \begin{macrocode}
+\def\nofiles{%
+ \@fileswfalse
+ \typeout{No auxiliary output files.^^J}%
+ \long\def\protected@write##1##2##3%
+ {\write\m@ne{}\if@nobreak\ifvmode\nobreak\fi\fi}%
+ \let\makeindex\relax
+ \let\makeglossary\relax}
+\@onlypreamble\nofiles
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{\protected@write}
+% This takes three arguments: an output stream, some initialization
+% code, and some text to write. It then writes this, with
+% appropriate handling of |\protect| and |\thepage|.
+% \changes{v1.0k}{1994/11/04}{Macro added ASAJ.}
+% \changes{v1.0t}{1995/05/25}
+% {(CAR) added \cs{long}}
+% \begin{macrocode}
+\long\def \protected@write#1#2#3{%
+ \begingroup
+ \let\thepage\relax
+ #2%
+ \let\protect\@unexpandable@protect
+ \edef\reserved@a{\write#1{#3}}%
+ \reserved@a
+ \endgroup
+ \if@nobreak\ifvmode\nobreak\fi\fi
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+\let\@auxout=\@mainaux
+% \end{macrocode}
+%
+%
+% \begin{macro}{\includeonly}
+% \changes{v1.0p}{1995/04/22}{Allow blanks in argument}
+% \begin{macrocode}
+\def\includeonly#1{%
+ \@partswtrue
+ \edef\@partlist{\zap@space#1 \@empty}}
+\@onlypreamble\includeonly
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\include}
+% \changes{v0.9p}{1994/01/18}
+% {Use \cs{@input@} so include files are listed.}
+% In the definition of |\include|, |\def\reserved@b| changed to
+% |\edef\reserved@b| to be consistent with the |\edef| in
+% |\includeonly|.
+% (Suggested by Rainer Sch\"opf \& Frank Mittelbach.
+% Change made 20 Jul 88.)
+%
+% Changed definition of |\include| to allow space at end of file name
+% --- otherwise, typing |\include{foo }| would cause \LaTeX\ to
+% overwrite |foo.tex|. Change made 24 May 89, suggested by Rainer
+% Sch\"opf and Frank Mittelbach
+%
+% Made |\include| check for being used inside an |\include|'d file, as
+% this will not work and cause surprising results.
+% \begin{macrocode}
+\def\include#1{\relax
+ \ifnum\@auxout=\@partaux
+ \@latex@error{\string\include\space cannot be nested}\@eha
+ \else \@include#1 \fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@include}
+% \begin{macrocode}
+\def\@include#1 {%
+ \clearpage
+ \if@filesw
+ \immediate\write\@mainaux{\string\@input{#1.aux}}%
+ \fi
+ \@tempswatrue
+ \if@partsw
+ \@tempswafalse
+ \edef\reserved@b{#1}%
+ \@for\reserved@a:=\@partlist\do
+ {\ifx\reserved@a\reserved@b\@tempswatrue\fi}%
+ \fi
+ \if@tempswa
+ \let\@auxout\@partaux
+ \if@filesw
+ \immediate\openout\@partaux #1.aux
+ \immediate\write\@partaux{\relax}%
+ \fi
+ \@input@{#1.tex}%
+ \clearpage
+ \@writeckpt{#1}%
+ \if@filesw
+ \immediate\closeout\@partaux
+ \fi
+ \else
+% \end{macrocode}
+% If the file is not included, reset |\deadcycles|, so that a long
+% list of non-included files does not generate an `Output loop'
+% error.
+% \changes{v1.1j}{1997/01/08}{reset \cs{deadcycles} latex/2365}
+% \begin{macrocode}
+ \deadcycles\z@
+ \@nameuse{cp@#1}%
+ \fi
+ \let\@auxout\@mainaux}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@writeckpt}
+% \begin{macrocode}
+\def\@writeckpt#1{%
+ \if@filesw
+ \immediate\write\@partaux{\string\@setckpt{#1}\@charlb}%
+ {\let\@elt\@wckptelt \cl@@ckpt}%
+ \immediate\write\@partaux{\@charrb}%
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@wckptelt}
+% \begin{macrocode}
+\def\@wckptelt#1{%
+ \immediate\write\@partaux{%
+ \string\setcounter{#1}{\the\@nameuse{c@#1}}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@setckpt}
+% RmS 93/08/31: introduced |\@setckpt|
+% \begin{macrocode}
+\def\@setckpt#1{\global\@namedef{cp@#1}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@charlb}
+% \begin{macro}{\@charrb}
+% The following defines |\@charlb| and |\@charrb| to be |{| and |}|,
+% respectively with |\catcode| 11.
+% \begin{macrocode}
+{\catcode`[=1 \catcode`]=2
+\catcode`{=11 \catcode`}=11
+\gdef\@charlb[{]
+\gdef\@charrb[}]
+]% }brace matching
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+%
+% \subsection{Safe Input Macros}
+%
+% \begin{macro}{\IfFileExists}
+% \changes{v0.9b}{1993/12/04}{Macro added}
+% \changes{v0.9p}{1994/01/18}{New Definition}
+% \changes{v1.0t}{1995/05/25}
+% {(CAR) added \cs{long}}
+%
+% \begin{macrocode}
+\long\def \IfFileExists#1#2#3{%
+ \openin\@inputcheck#1 %
+ \ifeof\@inputcheck
+ \ifx\input@path\@undefined
+ \def\reserved@a{#3}%
+ \else
+ \def\reserved@a{\@iffileonpath{#1}{#2}{#3}}%
+ \fi
+ \else
+ \closein\@inputcheck
+ \edef\@filef@und{#1 }%
+ \def\reserved@a{#2}%
+ \fi
+ \reserved@a}
+% \end{macrocode}
+%
+% \begin{macro}{\@iffileonpath}
+% If the file is not found by |\openin|, and |\input@path| is defined,
+% look in all the directories specified in |\input@path|.
+% \changes{v0.9p}{1994/01/18}{Macro added}
+% \changes{v1.0f}{1994/05/02}
+% {\cs{@break@loop} renamed to \cs{@break@tfor}}
+% \changes{v1.0t}{1995/05/25}
+% {(CAR) added \cs{long}}
+% \changes{v1.1d}{1996/01/10}
+% {Change argument handling to not require doubled hash. latex/2024}
+% \begin{macrocode}
+\long\def\@iffileonpath#1{%
+ \let\reserved@a\@secondoftwo
+ \expandafter\@tfor\expandafter\reserved@b\expandafter
+ :\expandafter=\input@path\do{%
+ \openin\@inputcheck\reserved@b#1 %
+ \ifeof\@inputcheck\else
+ \edef\@filef@und{\reserved@b#1 }%
+ \let\reserved@a\@firstoftwo%
+ \closein\@inputcheck
+ \@break@tfor
+ \fi}%
+ \reserved@a}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\InputIfFileExists}
+% \changes{v0.9b}
+% {1993/12/04}{Macro added}
+% \changes{v0.9p}
+% {1994/01/18}{New Definition}
+% \changes{v0.3b}{1994/03/13}
+% {Use new cmd \cs{@addtofilelist}}
+% Now define |\InputIfFileExists| to input |#1| if it seems to exist.
+% Immediately prior to the input, |#2| is executed.
+% If the file |#1| does not exist, execute `|#3|'.
+% \changes{v1.0t}{1995/05/25}
+% {(CAR) added \cs{long}}
+% \begin{macrocode}
+\long\def \InputIfFileExists#1#2{%
+ \IfFileExists{#1}%
+ {#2\@addtofilelist{#1}\@@input \@filef@und}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\input}
+% Input a file: if the argument is given in braces use safe input
+% macros, otherwise use \TeX's primitive |\input| command (which is
+% called |\@@input| in \LaTeX).
+% \changes{v0.9b}{1993/12/04}{Macro reimplemented}
+% \begin{macrocode}
+\def\input{\@ifnextchar\bgroup\@iinput\@@input}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@iinput}
+% Define |\@iinput| (i.e., |\input|) in terms of
+% |\InputIfIfileExists|.
+% \changes{v0.9b}{1993/12/04}{Macro reimplemented}
+% \begin{macrocode}
+\def\@iinput#1{%
+ \InputIfFileExists{#1}{}%
+ {\filename@parse{#1}%
+ \edef\reserved@a{\noexpand\@missingfileerror
+ {\filename@area\filename@base}%
+ {\ifx\filename@ext\relax tex\else\filename@ext\fi}}%
+ \reserved@a}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@input}
+% \changes{v0.9b}{1993/12/04}{Macro reimplemented}
+% \changes{v0.9p}{1994/01/18}%
+% {do not use a different definition for \cs{input@path}}
+% Define |\@input| in terms of |\IfIfileExists|.
+% So this is a `safe input' command, but the files input are not
+% listed by |\listfiles|.
+%
+% We don't want |.aux|, |.toc| files etc be listed by |\listfiles|.
+% However, something like |.bbl| probably should be listed and thus
+% should be implemented not by |\@input|.
+% \begin{macrocode}
+\def\@input#1{%
+ \IfFileExists{#1}{\@@input\@filef@und}{\typeout{No file #1.}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@input@}
+% \changes{v0.9p}{1994/01/18}{Macro added}
+% \task{???}{share code with `@input ?}
+% Version of |\@input| that does add the file to |\@filelist|.
+% \begin{macrocode}
+\def\@input@#1{\InputIfFileExists{#1}{}{\typeout{No file #1.}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@missingfileerror}
+% This `error' command avoids \TeX's primitive missing file loop.
+%
+% Missing file error. Prompt for a new filename, offering a default
+% extension.
+% \changes{LaTeX2e}{1993/11/21}
+% {Stop infinite looping on \cs{@er@ext}}
+% \changes{LaTeX2e}{1993/11/28}
+% {Use filename parser from dircheck}
+% \changes{LaTeX2e}{1994/03/15}
+% {Quit on x or X just like a real error}
+% \changes{LaTeX2e}{1994/05/26}
+% {Modify message format}
+% \changes{v1.0j}{1994/11/03}
+% {Move here from ltclass}
+% \changes{v1.0w}{1995/10/06}
+% {Autoload error}
+% \begin{macrocode}
+%<autoload>\def\@missingfileerror{\@autoerr\@missingfileerror}
+%</2ekernel|autoload>
+%<*2ekernel|autoerr>
+\gdef\@missingfileerror#1#2{%
+ \typeout{^^J! LaTeX Error: File `#1.#2' not found.^^J^^J%
+ Type X to quit or <RETURN> to proceed,^^J%
+ or enter new name. (Default extension: #2)^^J}%
+ \message{Enter file name: }%
+ {\endlinechar\m@ne
+ \global\read\m@ne to\@gtempa}%
+ \ifx\@gtempa\@empty
+ \else
+ \def\reserved@a{x}\ifx\reserved@a\@gtempa\batchmode\@@end\fi
+ \def\reserved@a{X}\ifx\reserved@a\@gtempa\batchmode\@@end\fi
+ \filename@parse\@gtempa
+ \edef\filename@ext{%
+ \ifx\filename@ext\relax#2\else\filename@ext\fi}%
+ \edef\reserved@a{%
+ \noexpand\InputIfFileExists
+ {\filename@area\filename@base.\filename@ext}%
+ {}%
+ {\noexpand\@missingfileerror
+ {\filename@area\filename@base}{\filename@ext}}}%
+ \reserved@a
+ \fi}
+%</2ekernel|autoerr>
+%<*2ekernel|autoload>
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@obsoletefile}
+% For compatibility with \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 produces a warning message.
+% \changes{v0.9m}{1993/12/20}{Added this command, removed
+% @oldfilewarning}
+% \changes{v1.0f}{1994/05/02}{Make \cs{@onlypreamble}}
+% \begin{macrocode}
+\def\@obsoletefile#1#2{%
+ \@latex@warning@no@line{inputting `#1' instead of obsolete `#2'}}
+\@onlypreamble\@obsoletefile
+% \end{macrocode}
+%
+% \subsection{Listing files}
+%
+% \begin{macro}{\@filelist}
+% A list of files input so far. The initial value of |\@gobble| eats
+% the comma before the first file name.
+% \begin{macrocode}
+\let\@filelist\@gobble
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@addtofilelist}
+% Add to the list of files input so far.
+% \changes{LaTeX2e}{1994/03/13}
+% {Macro added}
+% \changes{LaTeX2e}{1995/10/01}
+% {Macro added}
+% This `real' definition is only used for `cfg' files during initex.
+% An initial definition of |\@gobble| has already been set.
+% \begin{macrocode}
+%\def\@addtofilelist#1{\xdef\@filelist{\@filelist,#1}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\listfiles}
+% A preamble command to cause |\end{document}| to list files input
+% from the main file.
+% \changes{LaTeX2e}{1993/11/22}
+% {Removed checking for \cs{@unknownversion}}
+% \changes{LaTeX2e}{1994/01/17}
+% {New Version, adds `.tex' if needed, and lines up columns}
+% \changes{LaTeX2e}{1994/05/13}
+% {Stop \cs{listfiles} being run twice}
+% \changes{v1.0i}{1994/10/18}
+% {code moved here from ltclass}
+% \begin{macrocode}
+\def\listfiles{%
+ \let\listfiles\relax
+ \def\@listfiles##1##2##3##4##5##6##7##8##9\@@{%
+ \def\reserved@d{\\}%
+ \@tfor\reserved@c:=##1##2##3##4##5##6##7##8\do{%
+ \ifx\reserved@c\reserved@d
+ \edef\filename@area{ \filename@area}%
+ \fi}}%
+% \end{macrocode}
+%
+% \changes{v1.0o}{1994/11/30}
+% {Use \cs{@dofilelist}}
+% \begin{macrocode}
+ \def\@dofilelist{%
+ \typeout{^^J *File List*}%
+ \@for\@currname:=\@filelist\do{%
+ \filename@parse\@currname
+ \edef\reserved@a{%
+ \filename@base.%
+ \ifx\filename@ext\relax tex\else\filename@ext\fi}%
+ \expandafter\let\expandafter\reserved@b
+ \csname ver@\reserved@a\endcsname
+ \expandafter\expandafter\expandafter\@listfiles\expandafter
+ \filename@area\filename@base\\\\\\\\\\\\\\\\\\\@@
+ \typeout{%
+ \filename@area\reserved@a
+ \ifx\reserved@b\relax\else\@spaces\reserved@b\fi}}%
+ \typeout{ ***********^^J}}}
+% \end{macrocode}
+%
+% \changes{LaTeX2e}{1994/03/13}
+% {Reset \cs{@addtofilelist} at begin document}
+% \changes{LaTeX2e}{1994/03/16}
+% {Move this code directly into \cs{document}}
+% The |\@filelist| will be de-activated if |\listfiles| does not
+% appear in the preamble. |\begin{document}| contains code equivalent
+% to the following:
+%\begin{verbatim}
+% \AtBeginDocument{%
+% \ifx\@listfiles\@undefined
+% \let\@filelist\relax
+% \let\@addtofilelist\@gobble
+% \fi}
+%\end{verbatim}
+% \begin{macrocode}
+\@onlypreamble\listfiles
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@dofilelist}
+% \changes{v1.0o}{1994/11/30}
+% {Macro added}
+% \begin{macrocode}
+\let\@dofilelist\relax
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+%</2ekernel|autoload>
+% \end{macrocode}
+% \end{macro}
+%
+% \Finale
+%
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