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ltplain.dtx
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ltplain.dtx
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% \iffalse meta-comment
%
% Copyright 1993-2017
% 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 1.3c
% 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 2005/12/01 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: ltplain.dtx
%
%<*driver>
% \fi
\ProvidesFile{ltplain.dtx}
[2017/04/10 v2.3c LaTeX Kernel (Plain TeX)]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{ltplain.dtx}
\begin{document}
\title{\filename\\(The file plain.tex, modified for \LaTeX)}
\author{Donald~E.~Knuth\\
Modified by
Leslie Lamport, Frank Mittelbach,\\
Rainer Sch\"opf, David Carlisle}
\date{\filedate}
\MaintainedByLaTeXTeam{latex}
\maketitle
\DocInput{\filename}
\end{document}
%</driver>
% \fi
%
%
% \changes{v1.0a}{1994/03/08}
% {Remove need for a driver file.}
% \changes{v1.0b}{1994/03/12}
% {Name changed from lplain. The end of an era}
% \changes{v1.0e}{1994/03/12}{Replaced remaining width, height, depth
% by \LaTeX{} macro names to save tokens.}
% \changes{v1.1a}{1994/10/14}
% {Moved code to other files.}
% \changes{v1.1b}{1994/11/10}
% {(CAR) added patch to \cs{loop}.}
% \changes{v1.1f}{1994/11/25}
% {(DPC) Comment out lots of obsolete code}
% \changes{v1.1g}{1994/12/01}
% {(DPC) More doc changes}
% \changes{v1.1j}{1995/05/07}{Use \cs{hb@xt@}}
% \changes{v1.1j}{1995/05/21}{Moved some code to other files}
% \changes{v1.1n}{1995/07/02}{Removed surplus `by' and `\quotechar=' in
% various places}
% \changes{v1.1o}{1995/09/14}{Moved \cs{multispan} to lttab.dtx}
% \changes{v1.1r}{1995/10/10}{Autoload tracing code}
% \changes{v1.1u}{1996/10/28}{(CAR) More doc changes}
% \changes{v2.0e}{2015/02/21}{Removed autoload code}
% \changes{v2.2d}{2016/10/15}{Require e\TeX{}}
% \changes{v2.3b}{2016/11/06}{Drop \cs{outer} entirely}
%
% \section{Plain \TeX}
%
% \LaTeX\ includes almost all of the functionality of Knuth's original
% `Basic Macros' That is, the plain \TeX\ format described in Appendix~B
% of the \TeX{}Book. However, some of the user commands are not much
% use so, in order to save memory, we may remove them from the kernel
% into a package. Here is a list of the commands that may be removed
% (PROBABLY NOT COMPLETE).
% \begin{verbatim}
% \magstep \magstephalf
% \mathhexbox
% \vglue \vgl@
% \hglue \hgl@
% \end{verbatim}
%
% This file is by now very small as most of it has been moved to more
% appropriate kernel files: it may disappear completely one day.
%
% \LaTeX\ font definitions are done using NFSS2 so none of PLAIN's
% font definitions are in \LaTeX.
%
% \LaTeX\ has its own tabbing environment, so PLAIN's is disabled.
%
% \LaTeX{} uses its own output routine, so most of the plain one was
% removed.
%
% \StopEventually{}
%
%
% \begin{macrocode}
%<*2ekernel>
\catcode`\{=1 % left brace is begin-group character
\catcode`\}=2 % right brace is end-group character
\catcode`\$=3 % dollar sign is math shift
\catcode`\&=4 % ampersand is alignment tab
\catcode`\#=6 % hash mark is macro parameter character
\catcode`\^=7 % circumflex and uparrow are for superscripts
\catcode`\_=8 % underline and downarrow are for subscripts
\catcode`\^^I=10 % ascii tab is a blank space
\chardef\active=13 \catcode`\~=\active % tilde is active
\catcode`\^^L=\active \def^^L{\par}% ascii form-feed is \par
% \end{macrocode}
%
% \begin{macrocode}
\message{catcodes,}
% \end{macrocode}
%
% We had to define the |\catcodes| right away, before the message line,
% since |\message| uses the |{| and |}| characters.
% When INITEX (the \TeX\ initializer) starts up,
% it has defined the following |\catcode| values:\\
% |\catcode`\^^@=9 % | ascii null is ignored\\
% |\catcode`\^^M=5 % | ascii return is end-line\\
% |\catcode`\\=0 % | backslash is TeX escape character\\
% |\catcode`\%=14 % | percent sign is comment character\\
% |\catcode`\ =10 % | ascii space is blank space\\
% |\catcode`\^^?=15 %| ascii delete is invalid\\
% |\catcode`\A=11 ... \catcode`\Z=11 %| uppercase letters\\
% |\catcode`\a=11 ... \catcode`\z=11 %| lowercase letters\\
% all others are type 12 (other)
%
% Here is a list of the characters that have been specially catcoded:
% \begin{macrocode}
\def\dospecials{\do\ \do\\\do\{\do\}\do\$\do\&%
\do\#\do\^\do\_\do\%\do\~}
% \end{macrocode}
% (not counting ascii null, tab, linefeed, formfeed, return, delete)
% Each symbol in the list is preceded by \do, which can be defined
% if you want to do something to every item in the list.
%
% We make |@| signs act like letters, temporarily, to avoid conflict
% between user names and internal control sequences of plain format.
% \begin{macrocode}
\catcode`@=11
% \end{macrocode}
%
% To make the plain macros more efficient in time and space,
% several constant values are declared here as control sequences.
% If they were changed, anything could happen;
% so they are private symbols.
% \begin{macro}{\@ne}
% \begin{macro}{\tw@}
% \begin{macro}{\thr@@}
% \begin{macro}{\sixt@@n}
% \begin{macro}{\@cclv}
% Small constants are defined using |\chardef|.
% \begin{macrocode}
\chardef\@ne=1
\chardef\tw@=2
\chardef\thr@@=3
\chardef\sixt@@n=16
\chardef\@cclv=255
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@cclvi}
% \begin{macro}{\@m}
% \begin{macro}{\@M}
% \begin{macro}{\@MM}
% Constants above 255 defined using |\mathchardef|.
% \begin{macrocode}
\mathchardef\@cclvi=256
\mathchardef\@m=1000
\mathchardef\@M=10000
\mathchardef\@MM=20000
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% Allocation of registers
%
% Here are macros for the automatic allocation of |\count|, |\box|,
% |\dimen|, |\skip|, |\muskip|, and |\toks| registers, as well as
% |\read| and |\write| stream numbers, |\fam| codes, |\language| codes,
% and |\insert| numbers.
%
% \begin{macrocode}
\message{registers,}
% \end{macrocode}
%
% When a register is used only temporarily, it need not be allocated;
% grouping can be used, making the value previously in the register
% return after the close of the group. The main use of these macros is
% for registers that are defined by one macro and used by others,
% possibly at different nesting levels. All such registers should be
% defined through these macros; otherwise conflicts may occur,
% especially when two or more macro packages are being used at
% the same time.
%
% \begin{oldcomments}
% The following counters are reserved:
% 0 to 9 page numbering
% 10 count allocation
% 11 dimen allocation
% 12 skip allocation
% 13 muskip allocation
% 14 box allocation
% 15 toks allocation
% 16 read file allocation
% 17 write file allocation
% 18 math family allocation
% 19 language allocation
% 20 insert allocation
% 21 the most recently allocated number
% 22 constant -1
% \end{oldcomments}
%
% New counters are allocated starting with 23, 24, etc. Other registers
% are allocated starting with 10. This leaves 0 through 9 for the user
% to play with safely, except that counts 0 to 9 are considered to be
% the page and subpage numbers (since they are displayed during
% output). In this scheme, |\count| 10 always contains the number of the
% highest-numbered counter that has been allocated, |\count| 14 the
% highest-numbered box, etc. Inserts are given numbers 254, 253, etc.,
% since they require a |\count|, |\dimen|, |\skip|, and |\box| all with
% the same number; |\count| 20 contains the lowest-numbered insert that
% has been allocated. Of course, |\box|255 is reserved for |\output|;
% |\count|255, |\dimen|255, and |\skip|255 can be used freely.
%
% It is recommended that macro designers always use
% |\global| assignments with respect to registers numbered\\
% 1, 3, 5, 7, 9,\\
% and always non-|\global| assignments with respect to registers\\
% 0, 2, 4, 6, 8, 255.\\
% This will prevent ``save stack buildup'' that might otherwise occur.
%
% \begin{macrocode}
\count10=22 % allocates \count registers 23, 24, ...
\count11=9 % allocates \dimen registers 10, 11, ...
\count12=9 % allocates \skip registers 10, 11, ...
\count13=9 % allocates \muskip registers 10, 11, ...
\count14=9 % allocates \box registers 10, 11, ...
\count15=9 % allocates \toks registers 10, 11, ...
\count16=-1 % allocates input streams 0, 1, ...
\count17=-1 % allocates output streams 0, 1, ...
\count18=3 % allocates math families 4, 5, ...
\count19=0 % allocates \language codes 1, 2, ...
\count20=255 % allocates insertions 254, 253, ...
% \end{macrocode}
%
% \begin{macro}{\insc@unt}
% \begin{macro}{\allocationnumber}
% The insertion counter and most recent allocation.
% \begin{macrocode}
\countdef\insc@unt=20
\countdef\allocationnumber=21
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\m@ne}
% The constant $-1$.
% \begin{macrocode}
\countdef\m@ne=22 \m@ne=-1
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\wlog}
% Write on log file (only)
% \begin{macrocode}
\def\wlog{\immediate\write\m@ne}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\count@}
% \begin{macro}{\dimen@}
% \begin{macro}{\dimen@i}
% \begin{macro}{\dimen@ii}
% \begin{macro}{\skip@}
% \begin{macro}{\toks@}
% Here are abbreviations for the names of scratch registers
% that don't need to be allocated.
% \begin{macrocode}
\countdef\count@=255
\dimendef\dimen@=0
\dimendef\dimen@i=1 % global only
\dimendef\dimen@ii=2
\skipdef\skip@=0
\toksdef\toks@=0
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\newcount}
% \begin{macro}{\newdimen}
% \begin{macro}{\newskip}
% \begin{macro}{\newmuskip}
% \begin{macro}{\newbox}
% \begin{macro}{\newread}
% \begin{macro}{\newwrite}
% \begin{macro}{\newlanguage}
% \changes{v1.0c}{1994/03/28}
% {Remove some \cs{outer} declarations.}
% \changes{v1.1h}{1995/04/24}
% {Remove remaining \cs{outer} declarations.}
% Now, we define |\newcount|, |\newbox|, etc. so that you can say
% |\newcount\foo| and |\foo| will be defined (with |\countdef|) to
% be the next counter.
%
% To find out which counter |\foo| is, you can look at
% |\allocationnumber|.
%
% Since there's no |\boxdef| command, |\chardef| is used to define a
% |\newbox|, |\newinsert|, |\newfam|, and so on.
%
% \LaTeX\ change: remove |\outer| from |\newcount| and |\newdimen| (FMi)
% This is necessary to use |\newcount| inside |\if...|
% later on. Also remove from |\newskip|, |\newbox|
% |\newwrite| and |\newfam| (DPC) to save later redefinition.
% \changes{v2.0a}{2014/12/30}{New engine-specific allocation scheme (latexrelease)}
% \changes{v2.0f}{2015/03/02}{allow 255 math groups in Unicode engines}
% \changes{v2.0h}{2015/06/19}{Use $-1$ for first range to get contiguous allocation}
% \begin{macrocode}
%</2ekernel>
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\newcount}{Extended Allocation}%
% \end{macrocode}
%
% \begin{macrocode}
\def\newcount {\e@alloc\count \countdef {\count10}\insc@unt\float@count}
\def\newdimen {\e@alloc\dimen \dimendef {\count11}\insc@unt\float@count}
\def\newskip {\e@alloc\skip \skipdef {\count12}\insc@unt\float@count}
\def\newmuskip
{\e@alloc\muskip\muskipdef{\count13}\m@ne\e@alloc@top}
% \end{macrocode}
% For compatibility use |\chardef| in the classical range.
% \begin{macrocode}
\def\newbox {\e@alloc\box
{\ifnum\allocationnumber<\@cclvi
\expandafter\chardef
\else
\expandafter\e@alloc@chardef
\fi}
{\count14}\insc@unt\float@count}
\def\newtoks {\e@alloc\toks \toksdef{\count15}\m@ne\e@alloc@top}
\def\newread {\e@alloc\read \chardef{\count16}\m@ne\sixt@@n}
% \end{macrocode}
%
% \changes{v2.2a}{2015/11/18}
% {Extended stream allocation in luatex (0.85)}
% \changes{v2.2b}{2015/11/19}
% {Only extend allocation of write streams (see luatex list)}
% \changes{v2.3c}{2017/04/10}
% {Correction to code to skip write18 in luatex}
% Skip |\write18| due to its traditional use as a shell-escape.
% \begin{macrocode}
\ifx\directlua\@undefined
\def\newwrite {\e@alloc\write \chardef{\count17}\m@ne\sixt@@n}
\else
\def\newwrite {\e@alloc\write
{\ifnum\allocationnumber=18
\advance\count17\@ne
\allocationnumber\count17 %
\fi
\global\chardef}%
{\count17}%
\m@ne
{128}}
\fi
% \end{macrocode}
%
% \begin{macrocode}
\def\new@mathgroup
{\e@alloc\mathgroup\chardef{\count18}\m@ne\e@mathgroup@top}
\let\newfam\new@mathgroup
% \end{macrocode}
%
% \changes{v2.3a}{2016/10/16}{Allow languages up to 16383 in luatex}
% \begin{macrocode}
\ifx\directlua\@undefined
\def\newlanguage {\e@alloc\language \chardef{\count19}\m@ne\@cclvi}
\else
\def\newlanguage {\e@alloc\language \chardef{\count19}\m@ne{16384}}
\fi
%</2ekernel|latexrelease>
% \end{macrocode}
%
% \begin{macrocode}
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\newcount}{Extended Allocation}%
%<latexrelease>\def\newcount{\alloc@0\count\countdef\insc@unt}
%<latexrelease>\def\newdimen{\alloc@1\dimen\dimendef\insc@unt}
%<latexrelease>\def\newskip{\alloc@2\skip\skipdef\insc@unt}
%<latexrelease>\def\newmuskip{\alloc@3\muskip\muskipdef\@cclvi}
%<latexrelease>\def\newbox{\alloc@4\box\chardef\insc@unt}
%<latexrelease>\def\newtoks{\alloc@5\toks\toksdef\@cclvi}
%<latexrelease>\def\newread{\alloc@6\read\chardef\sixt@@n}
%<latexrelease>\def\newwrite{\alloc@7\write\chardef\sixt@@n}
%<latexrelease>\def\new@mathgroup{\alloc@8\fam\chardef\sixt@@n}
%<latexrelease>\def\newlanguage{\alloc@9\language\chardef\@cclvi}
%<latexrelease>\let\newfam\new@mathgroup
%<latexrelease>\EndIncludeInRelease
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
%\begin{macro}{\e@alloc@chardef}
% \changes{v2.0a}{2014/12/30}{macro added}
%\begin{macro}{\e@alloc@top}
% \changes{v2.0a}{2014/12/30}{macro added}
% The upper limit of extended registers, which leaves
% this number (eg |\dimen32767|) always unallocated
% by these macros.
% cf traditional |\dimen255|.
% \begin{macrocode}
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\e@alloc@chardef}{Extended Allocation}%
% \end{macrocode}
%
% \begin{macrocode}
\ifx\directlua\@undefined
\ifx\widowpenalties\@undefined
% \end{macrocode}
% classic tex has $2^8$ registers.
% \begin{macrocode}
\mathchardef\e@alloc@top=255
\let\e@alloc@chardef\chardef
\else
% \end{macrocode}
% etex and xetex have $2^{15}$ registers.
% \begin{macrocode}
\mathchardef\e@alloc@top=32767
\let\e@alloc@chardef\mathchardef
\fi
\else
% \end{macrocode}
% luatex has $2^{16}$ registers.
% \begin{macrocode}
\chardef\e@alloc@top=65535
\let\e@alloc@chardef\chardef
\fi
% \end{macrocode}
%
% \begin{macrocode}
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\e@alloc@chardef}{Extended Allocation}%
%<latexrelease>\let\e@alloc@top\@undefined
%<latexrelease>\let\e@alloc@chardef\@undefined
%<latexrelease>\EndIncludeInRelease
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%\begin{macro}{\e@mathgroup@top}
% \changes{v2.0f}{2015/03/02}{macro added}
% The upper limit of extended math groups (|\fam|)
% 16 in classic \TeX\ and e-\TeX, but 256 in Unicode TeX variants.
% \begin{macrocode}
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\e@mathgroup@top}{Extended Allocation}%
% \end{macrocode}
%
% \begin{macrocode}
\ifx\Umathcode\@undefined
% \end{macrocode}
% classic and e tex have 16 fam (0--15).
% \begin{macrocode}
\chardef\e@mathgroup@top=16
\else
% \end{macrocode}
% xetex and luatex have 256 fam (0--255).
% \begin{macrocode}
\chardef\e@mathgroup@top=256
\fi
% \end{macrocode}
%
% \begin{macrocode}
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\e@mathgroup@top}{Extended Allocation}%
%<latexrelease>\let\e@mathgroup@top\@undefined
%<latexrelease>\EndIncludeInRelease
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\e@alloc}
% \changes{v2.0a}{2014/12/30}{macro added}
% A modified version of |\alloc@| that
% takes the count register rather than just the final digit of its number
% (assuming |\count|$1x$).
% It also has an extra argument to give the top of the extended range.
%
% | #1 #2 #3 #4 #5 #6 |
%
% | \e@alloc type defcmd current top extended-top newname|
%
% Note that if just a single allocation range is required
% (not omitting a range up to 255 for inserts) then $-1$
% should be used for the first upper bound argument, |#4|.
%
% \begin{macrocode}
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2015/01/01}{\e@alloc}{Extended Allocation}%
% \end{macrocode}
%
% \changes{v2.0h}{2015/06/19}{extra braces in case arguments not single token}
% \begin{macrocode}
\def\e@alloc#1#2#3#4#5#6{%
\global\advance#3\@ne
\e@ch@ck{#3}{#4}{#5}#1%
\allocationnumber#3\relax
\global#2#6\allocationnumber
\wlog{\string#6=\string#1\the\allocationnumber}}%
% \end{macrocode}
%
% \begin{macrocode}
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}{\e@alloc}{Extended Allocation}%
%<latexrelease>\let\e@alloc\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
%\begin{macro}{\e@ch@ck}
% \changes{v2.0a}{2014/12/30}{macro added}
% Extended check command.
% If the first range is exceeded, bump to 256 (or 266 for counts)
% and try again, testing the extended range.
%\begin{macro}{\extrafloats}
% \changes{v2.0a}{2014/12/30}{macro added}
% \changes{v2.0c}{2015/01/23}{reserve counts 256--265}
% Allocate matching registers from the top of the extended range
% and add to |\@freelist|.
% \begin{macrocode}
%</2ekernel>
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2015/10/01}
%<latexrelease> {\e@ch@ck}{Extended Allocation (checking)}%
% \end{macrocode}
%
% \begin{macrocode}
\gdef\e@ch@ck#1#2#3#4{%
\ifnum#1<#2\else
% \end{macrocode}
%
% If we've reached the classical top limit, bump to 256
% or 266 for counts (count 256--265 are reserved by the allocation
% system).
% \changes{v2.1b}{2015/10/27}
% {Use global assignment when switching to extended range}
% \begin{macrocode}
\ifnum#1=#2\relax
\global#1\@cclvi
\ifx\count#4\global\advance#1 10 \fi
\fi
% \end{macrocode}
% Check we are below the extended limit.
% \changes{v2.0i}{2015/08/06}
% {Add \cs{string} in case argument is not an unexpandable primitive}
% \begin{macrocode}
\ifnum#1<#3\relax
\else
\errmessage{No room for a new \string#4}%
\fi
\fi}%
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\e@ch@ck}{Extended Allocation (checking)}%
%<latexrelease>\gdef\e@ch@ck#1#2#3#4{%
%<latexrelease> \ifnum#1<#2\else
%<latexrelease> \ifnum#1=#2\relax
%<latexrelease> #1\@cclvi
%<latexrelease> \ifx\count#4\advance#1 10 \fi
%<latexrelease> \fi
%<latexrelease> \ifnum#1<#3\relax
%<latexrelease> \else
%<latexrelease> \errmessage{No room for a new #4}%
%<latexrelease> \fi
%<latexrelease> \fi}%
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\e@ch@ck}{Extended Allocation (checking)}%
%<latexrelease>\let\e@ch@ck\@undefined
%<latexrelease>\EndIncludeInRelease
% \end{macrocode}
%
% \begin{macrocode}
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\extrafloats}{Extra floats}%
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
\let\float@count\e@alloc@top
% \end{macrocode}
%
% \begin{macro}{\extrafloats}
% \changes{v2.2c}{2016/07/29}{use \cs{global} \cs{chardef}}
% \begin{macrocode}
\ifx\numexpr\@undefined
% \end{macrocode}
% In classic TeX use |\newinsert| to allocate float boxes.
% \begin{macrocode}
\def\extrafloats#1{%
\count@#1\relax
\ifnum\count@>\z@
\newinsert\reserved@a
\global\expandafter\chardef
\csname bx@\the\allocationnumber\endcsname\allocationnumber
\@cons\@freelist{\csname bx@\the\allocationnumber\endcsname}%
\advance\count@\m@ne
\expandafter\extrafloats
\expandafter\count@
\fi
}%
% \end{macrocode}
%
% \begin{macrocode}
\else
% \end{macrocode}
% In e-tex take float boxes from the top of the extended range.
% \begin{macrocode}
\def\extrafloats#1{%
\ifnum#1>\z@
\count@\numexpr\float@count-1\relax
\ch@ck0\count@\count
\ch@ck1\count@\dimen
\ch@ck2\count@\skip
\ch@ck4\count@\box
\global\e@alloc@chardef\float@count\count@
\global\expandafter\e@alloc@chardef
\csname bx@\the\float@count\endcsname\float@count
\@cons\@freelist{\csname bx@\the\float@count\endcsname}%
\expandafter
\extrafloats\expandafter{\numexpr#1-1\relax}%
\fi}%
% \end{macrocode}
%
% \begin{macrocode}
\fi
% \end{macrocode}
%
% \begin{macrocode}
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\extrafloats}{Extra floats}%
%<latexrelease>\let\float@count\@undefined
%<latexrelease>\let\extrafloats\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\alloc@}
% \begin{macrocode}
\def\alloc@#1#2#3#4#5{\global\advance\count1#1\@ne
\ch@ck#1#4#2%
\allocationnumber\count1#1%
\global#3#5\allocationnumber
\wlog{\string#5=\string#2\the\allocationnumber}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\newinsert}
% \changes{v2.1a}{2015/08/30}{new \cs{newinsert} implementation}
% \begin{macrocode}
%</2ekernel>
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2015/10/01}
%<latexrelease> {\newinsert}{Extended \newinsert}%
% \end{macrocode}
% \begin{macrocode}
\ifx\numexpr\@undefined
% \end{macrocode}
% If e-\TeX\ is not available use the original plain \TeX\
% definition of |\newinsert|.
% \begin{macrocode}
\def\newinsert#1{\global\advance\insc@unt \m@ne
\ch@ck0\insc@unt\count
\ch@ck1\insc@unt\dimen
\ch@ck2\insc@unt\skip
\ch@ck4\insc@unt\box
\allocationnumber\insc@unt
\global\chardef#1\allocationnumber
\wlog{\string#1=\string\insert\the\allocationnumber}}
% \end{macrocode}
% \begin{macrocode}
\else
% \end{macrocode}
% The highest register allowed with |\insert|.
% \begin{macrocode}
\ifx\directlua\@undefined
\chardef\e@insert@top255
\else
\chardef\e@insert@top\e@alloc@top
\fi
% \end{macrocode}
% If the classic registers are exausted, take an insert from the free float list
% and use |\extrafloats| to add a new float to that list.
% \changes{v2.2c}{2016/07/29}{fix for tlb-newinsert-001}
% \begin{macrocode}
\def\newinsert#1{%
\@tempswafalse
\global\advance\insc@unt\m@ne
\ifnum\count10<\insc@unt
\ifnum\count11<\insc@unt
\ifnum\count12<\insc@unt
\ifnum\count14<\insc@unt
\@tempswatrue
\fi\fi\fi\fi
\if@tempswa
\allocationnumber\insc@unt
\else
\global\advance\insc@unt\@ne
\extrafloats\@ne
\@next\@currbox\@freelist
{\ifnum\@currbox<\e@insert@top
\allocationnumber\@currbox
\else
\ch@ck0\m@ne\insert
\fi}%
{\ch@ck0\m@ne\insert}%
\fi
\global\chardef#1\allocationnumber
\wlog{\string#1=\string\insert\the\allocationnumber}%
}
% \end{macrocode}
% \begin{macrocode}
\fi
%</2ekernel|latexrelease>
% \end{macrocode}
%
% \begin{macrocode}
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\newinsert}{Extended \newinsert}%
%<latexrelease>\let\e@insert@top\@undefined
%<latexrelease>\def\newinsert#1{\global\advance\insc@unt \m@ne
%<latexrelease> \ch@ck0\insc@unt\count
%<latexrelease> \ch@ck1\insc@unt\dimen
%<latexrelease> \ch@ck2\insc@unt\skip
%<latexrelease> \ch@ck4\insc@unt\box
%<latexrelease> \allocationnumber\insc@unt
%<latexrelease> \global\chardef#1\allocationnumber
%<latexrelease> \wlog{\string#1=\string\insert\the\allocationnumber}}
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ch@ck}
% \begin{macrocode}
\gdef\ch@ck#1#2#3{%
\ifnum\count1#1<#2\else
\errmessage{No room for a new #3}%
\fi}
% \end{macrocode}
% \end{macro}
%
% \changes{v2.0h}{2015/06/19}{delete spurious old definition of \cs{newtoks}}
% \begin{macro}{\newhelp}
% \begin{macrocode}
\def\newhelp#1#2{\newtoks#1#1\expandafter{\csname#2\endcsname}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\maxdimen}
% \begin{macro}{\hideskip}
% Here are some examples of allocation.
% \begin{macrocode}
\newdimen\maxdimen \maxdimen=16383.99999pt % the largest legal <dimen>
\newskip\hideskip \hideskip=-1000pt plus 1fill % negative but can grow
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\p@}
% \begin{macro}{\z@}
% \begin{macro}{\z@skip}
% \begin{macro}{\voidb@x}
% \begin{macrocode}
\newdimen\p@ \p@=1pt % this saves macro space and time
\newdimen\z@ \z@=0pt % can be used both for 0pt and 0
\newskip\z@skip \z@skip=0pt plus0pt minus0pt
\newbox\voidb@x % permanently void box register
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% Assign initial values to \TeX's parameters
%
% \begin{macrocode}
\message{parameters,}
% \end{macrocode}
%
% All of \TeX's numeric parameters are listed here,
% but the code is commented out if no special value needs to be set.
% INITEX makes all parameters zero except where noted.
%
% \begin{oldcomments}
% \begin{macrocode}
\pretolerance=100
\tolerance=200 % INITEX sets this to 10000
\hbadness=1000
\vbadness=1000
\linepenalty=10
\hyphenpenalty=50
\exhyphenpenalty=50
\binoppenalty=700
\relpenalty=500
\clubpenalty=150
\widowpenalty=150
\displaywidowpenalty=50
\brokenpenalty=100
\predisplaypenalty=10000
% \end{macrocode}
% \postdisplaypenalty=0
% \interlinepenalty=0
% \floatingpenalty=0, set during \insert
% \outputpenalty=0, set before TeX enters \output
% \begin{macrocode}
\doublehyphendemerits=10000
\finalhyphendemerits=5000
\adjdemerits=10000
% \end{macrocode}
% \looseness=0, cleared by TeX after each paragraph
% \pausing=0
% \holdinginserts=0
% \tracingonline=0
% \tracingmacros=0
% \tracingstats=0
% \tracingparagraphs=0
% \tracingpages=0
% \tracingoutput=0
% \begin{macrocode}
\tracinglostchars=1
% \end{macrocode}
% \tracingcommands=0
% \tracingrestores=0
% \language=0
% \begin{macrocode}
\uchyph=1
% \end{macrocode}
% \lefthyphenmin=2 \righthyphenmin=3 set below
% \globaldefs=0
% \maxdeadcycles=25 % INITEX does this
% \hangafter=1 % INITEX does this, also TeX after each paragraph
% \fam=0
% \mag=1000 % INITEX does this
% \escapechar=`\\ % INITEX does this
% \begin{macrocode}
\defaulthyphenchar=`\-
\defaultskewchar=-1
% \end{macrocode}
% \endlinechar=`\^^M % INITEX does this
% \newlinechar=-1 \LaTeX\ sets this in ltdefns.dtx.
% \begin{macrocode}
\delimiterfactor=901
% \end{macrocode}
% \time=now % TeX does this at beginning of job
% \day=now % TeX does this at beginning of job
% \month=now % TeX does this at beginning of job
% \year=now % TeX does this at beginning of job
%
% \end{oldcomments}
% In \LaTeX{} we don't want box information in the transcript
% unless we do a full tracing.
% \changes{v1.0g}{1994/04/28}{Turn off overfull box tracing in log}
%
% \begin{macrocode}
\showboxbreadth=-1
\showboxdepth=-1
\errorcontextlines=-1
% \end{macrocode}
%
% \begin{macrocode}
\hfuzz=0.1pt
\vfuzz=0.1pt
\overfullrule=5pt
\maxdepth=4pt
\splitmaxdepth=\maxdimen
\boxmaxdepth=\maxdimen
% \end{macrocode}
%
% \begin{oldcomments}
% \lineskiplimit=0pt, changed by \normalbaselines
% \begin{macrocode}
\delimitershortfall=5pt
\nulldelimiterspace=1.2pt
\scriptspace=0.5pt
% \end{macrocode}
% \mathsurround=0pt
% \predisplaysize=0pt, set before TeX enters $$
% \displaywidth=0pt, set before TeX enters $$
% \displayindent=0pt, set before TeX enters $$
% \begin{macrocode}
\parindent=20pt
% \end{macrocode}
% \hangindent=0pt, zeroed by TeX after each paragraph
% \hoffset=0pt
% \voffset=0pt
%
% \baselineskip=0pt, changed by \normalbaselines
% \lineskip=0pt, changed by \normalbaselines
% \begin{macrocode}
\parskip=0pt plus 1pt
\abovedisplayskip=12pt plus 3pt minus 9pt
\abovedisplayshortskip=0pt plus 3pt
\belowdisplayskip=12pt plus 3pt minus 9pt
\belowdisplayshortskip=7pt plus 3pt minus 4pt
% \end{macrocode}
% \leftskip=0pt
% \rightskip=0pt
% \begin{macrocode}
\topskip=10pt
\splittopskip=10pt
% \end{macrocode}
% \tabskip=0pt
% \spaceskip=0pt
% \xspaceskip=0pt
% \begin{macrocode}
\parfillskip=0pt plus 1fil
% \end{macrocode}
% \end{oldcomments}
%
%
% \begin{macro}{\normalbaselineskip}
% \begin{macro}{\normallineskip}
% \begin{macro}{\normallineskiplimit}
% We also define special registers that function like parameters:
% \begin{macrocode}
\newskip\normalbaselineskip \normalbaselineskip=12pt
\newskip\normallineskip \normallineskip=1pt
\newdimen\normallineskiplimit \normallineskiplimit=0pt
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\interfootlinepenalty}
% \begin{macrocode}
\newcount\interfootnotelinepenalty \interfootnotelinepenalty=100
% \end{macrocode}
% \end{macro}
%
% Definitions for preloaded fonts
%
% \begin{macro}{\magstephalf}
% \begin{macro}{\magstep}
% \begin{macrocode}
\def\magstephalf{1095 }
\def\magstep#1{\ifcase#1 \@m\or 1200\or 1440\or 1728\or
2074\or 2488\fi\relax}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% Macros for setting ordinary text
%
% \begin{macro}{\frenchspacing}
% \begin{macro}{\nonfrenchspacing}
% \begin{macrocode}