/usr/share/texlive/texmf-dist/tex/luatex/luatexbase/luatexbase-regs.sty is in texlive-luatex 2012.20120611-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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%% This is file `luatexbase-regs.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% luatexbase-regs.dtx (with options: `texpackage')
%%
%% Written in 2009, 2010 by Manuel Pegourie-Gonnard and Elie Roux.
%%
%% This work is under the CC0 license.
%% See source file 'luatexbase-regs.dtx' for details.
%%
\csname lltxb@regs@loaded\endcsname
\expandafter\let\csname lltxb@regs@loaded\endcsname\endinput
\begingroup
\catcode123 1 % {
\catcode125 2 % }
\catcode 35 6 % #
\toks0{}%
\def\x{}%
\def\y#1 #2 {%
\toks0\expandafter{\the\toks0 \catcode#1 \the\catcode#1}%
\edef\x{\x \catcode#1 #2}}%
\y 123 1 % {
\y 125 2 % }
\y 35 6 % #
\y 10 12 % ^^J
\y 34 12 % "
\y 36 3 % $ $
\y 39 12 % '
\y 40 12 % (
\y 41 12 % )
\y 42 12 % *
\y 43 12 % +
\y 44 12 % ,
\y 45 12 % -
\y 46 12 % .
\y 47 12 % /
\y 60 12 % <
\y 61 12 % =
\y 64 11 % @ (letter)
\y 62 12 % >
\y 95 12 % _ (other)
\y 96 12 % `
\edef\y#1{\endgroup\edef#1{\the\toks0\relax}\x}%
\expandafter\y\csname lltxb@regs@AtEnd\endcsname
\begingroup
\expandafter\ifx\csname ProvidesPackage\endcsname\relax
\def\x#1[#2]{\immediate\write16{Package: #1 #2}}
\else
\let\x\ProvidesPackage
\fi
\expandafter\endgroup
\x{luatexbase-regs}[2010/10/10 v0.3 Registers allocation for LuaTeX]
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname RequirePackage\endcsname\relax
\input ifluatex.sty
\else
\RequirePackage{ifluatex}
\fi
\ifluatex\else
\begingroup
\expandafter\ifx\csname PackageError\endcsname\relax
\def\x#1#2#3{\begingroup \newlinechar10
\errhelp{#3}\errmessage{Package #1 error: #2}\endgroup}
\else
\let\x\PackageError
\fi
\expandafter\endgroup
\x{luatexbase-attr}{LuaTeX is required for this package. Aborting.}{%
This package can only be used with the LuaTeX engine^^J%
(command `lualatex' or `luatex').^^J%
Package loading has been stopped to prevent additional errors.}
\lltxb@regs@AtEnd
\expandafter\endinput
\fi
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname RequirePackage\endcsname\relax \else
\RequirePackage{etex}[1998/03/26]
\fi
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname et@xins\endcsname\relax
\begingroup
\expandafter\ifx\csname PackageWarningNoLine\endcsname\relax
\def\x#1#2{\begingroup\newlinechar10
\immediate\write16{Package #1 warning: #2}\endgroup}
\else
\let\x\PackageWarningNoLine
\fi
\expandafter\endgroup
\x{luatexbase-regs}{etex macros not loaded!^^J%
Registers allocation scheme will not be extended.}
\else
\ifnum\count270=32768 \count270=65536 \fi
\ifnum\count271=32768 \count271=65536 \fi
\ifnum\count272=32768 \count272=65536 \fi
\ifnum\count273=32768 \count272=65536 \fi
\ifnum\count273=32768 \count273=65536 \fi
\ifnum\count274=32768 \count274=65536 \fi
\ifnum\count275=32768 \count275=65536 \fi
\ifnum\count276=32768 \count276=65536 \fi
\begingroup \toks0{}
\def\@namedef #1{\expandafter \def\csname#1\endcsname}
\def\@outerdef#1{\expandafter\outer\expandafter\def\csname#1\endcsname}
\def\def@globbox #1#2{\@outerdef{#1}{\et@xglob 4 \box #2}}
\def\def@locbox #1#2{\@namedef {#1}{\et@xloc 4 \box #2}}
\def\def@globmarks #1#2{\@outerdef{#1}{\et@xglob 6 \marks #2}}
\def\def@locmarks #1#2{\@namedef {#1}{\et@xloc 6 \marks #2}}
\def\def@et@xgblk#1#2{\@namedef{#1}##1##2##3##4%
{\et@xchkblk ##1##2{##4}%
{\allocationnumber=\count 26##1
\global \advance \count 26##1 by ##4%
\global #2##3=\allocationnumber
\wlog {\string ##3=\string ##2blk{\number ##4}
at \the \allocationnumber}%
}%
}}
\def\def@et@xlblk#1#2{\@namedef{#1}##1##2##3##4%
{\et@xchkblk ##1##2{##4}%
{\advance \count 27##1 by -##4%
\allocationnumber=\count 27##1
#2##3=\allocationnumber
\wlog {\string ##3=\string ##2blk{\number ##4}
at \the \allocationnumber \space (local)%
}%
}%
}}
\def\alt@globbox #1#2{\@namedef{#1}{\et@xglob 4\box #2}}
\def\alt@locbox #1#2{\@namedef{#1}{\et@xloc 4\box #2}}
\def\alt@globmarks #1#2{\@namedef{#1}{\et@xglob 6\marks #2}}
\def\alt@locmarks #1#2{\@namedef{#1}{\et@xloc 6\marks #2}}
\def\alt@et@xgblk#1#2{\@namedef{#1}##1##2##3##4%
{\et@xchkblk##1##2{##4}%
{\allocationnumber\count26##1%
\global\advance\count26##1by##4%
\global#2##3\allocationnumber
\wlog{\string##3=\string##2blk{\number##4} at
\the\allocationnumber}%
}%
}}
\def\alt@et@xlblk#1#2{\@namedef{#1}##1##2##3##4%
{\et@xchkblk##1##2{##4}%
{\advance\count27##1-##4%
\allocationnumber\count27##1%
#2##3\allocationnumber
\et@xwlog{\string##3=\string##2blk{\number##4} at
\the\allocationnumber\space(local)}%
}%
}}
\def\check@def#1{%
\csname def@#1\endcsname{test@#1}\mathchardef
\expandafter\ifx\csname test@#1\expandafter\endcsname
\csname #1\endcsname
\expandafter\let\csname #1\endcsname\relax
\toks0\expandafter{\the\toks0\csname def@#1\endcsname{#1}\chardef}
\else
\csname alt@#1\endcsname{test@#1}\mathchardef
\expandafter\ifx\csname test@#1\expandafter\endcsname
\csname #1\endcsname
\toks0\expandafter{\the\toks0\csname alt@#1\endcsname{#1}\chardef}
\else
\expandafter\show\csname BAD#1\endcsname
\fi
\fi}
\check@def{globbox}
\check@def{locbox}
\check@def{globmarks}
\check@def{locmarks}
\check@def{et@xgblk}
\check@def{et@xlblk}
\expandafter \endgroup
\the\toks0
\expandafter\let\csname newcount\endcsname\globcount
\expandafter\let\csname newdimen\endcsname\globdimen
\expandafter\let\csname newskip\endcsname\globskip
\expandafter\let\csname newbox\endcsname\globbox
\fi
\lltxb@regs@AtEnd
\endinput
%%
%% End of file `luatexbase-regs.sty'.
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