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Annotation of GNUtools/bison/texinfo.tex, revision 1.1

1.1     ! root        1: %% TeX macros to handle texinfo files
        !             2: 
        !             3: %   Copyright (C) 1985, 86, 88, 90, 91, 92, 1993 Free Software Foundation, Inc.
        !             4: 
        !             5: %This texinfo.tex file is free software; you can redistribute it and/or
        !             6: %modify it under the terms of the GNU General Public License as
        !             7: %published by the Free Software Foundation; either version 2, or (at
        !             8: %your option) any later version.
        !             9: 
        !            10: %This texinfo.tex file is distributed in the hope that it will be
        !            11: %useful, but WITHOUT ANY WARRANTY; without even the implied warranty
        !            12: %of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            13: %General Public License for more details.
        !            14: 
        !            15: %You should have received a copy of the GNU General Public License
        !            16: %along with this texinfo.tex file; see the file COPYING.  If not, write
        !            17: %to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
        !            18: %USA.
        !            19: 
        !            20: 
        !            21: %In other words, you are welcome to use, share and improve this program.
        !            22: %You are forbidden to forbid anyone else to use, share and improve
        !            23: %what you give them.   Help stamp out software-hoarding!
        !            24: 
        !            25: \def\texinfoversion{2.112}
        !            26: \message{Loading texinfo package [Version \texinfoversion]:}
        !            27: 
        !            28: % Print the version number if in a .fmt file.
        !            29: \everyjob{\message{[Texinfo version \texinfoversion]}\message{}}
        !            30: 
        !            31: % Save some parts of plain tex whose names we will redefine.
        !            32: 
        !            33: \let\ptexlbrace=\{
        !            34: \let\ptexrbrace=\}
        !            35: \let\ptexdots=\dots
        !            36: \let\ptexdot=\.
        !            37: \let\ptexstar=\*
        !            38: \let\ptexend=\end
        !            39: \let\ptexbullet=\bullet
        !            40: \let\ptexb=\b
        !            41: \let\ptexc=\c
        !            42: \let\ptexi=\i
        !            43: \let\ptext=\t
        !            44: \let\ptexl=\l
        !            45: \let\ptexL=\L
        !            46: 
        !            47: \def\tie{\penalty 10000\ }     % Save plain tex definition of ~.
        !            48: 
        !            49: \message{Basics,}
        !            50: \chardef\other=12
        !            51: 
        !            52: % If this character appears in an error message or help string, it
        !            53: % starts a new line in the output.
        !            54: \newlinechar = `^^J
        !            55: 
        !            56: % Ignore a token.
        !            57: %
        !            58: \def\gobble#1{}
        !            59: 
        !            60: \hyphenation{ap-pen-dix}
        !            61: \hyphenation{mini-buf-fer mini-buf-fers}
        !            62: \hyphenation{eshell}
        !            63: 
        !            64: % Margin to add to right of even pages, to left of odd pages.
        !            65: \newdimen \bindingoffset  \bindingoffset=0pt
        !            66: \newdimen \normaloffset   \normaloffset=\hoffset
        !            67: \newdimen\pagewidth \newdimen\pageheight
        !            68: \pagewidth=\hsize \pageheight=\vsize
        !            69: 
        !            70: % Sometimes it is convenient to have everything in the transcript file
        !            71: % and nothing on the terminal.  We don't just call \tracingall here,
        !            72: % since that produces some useless output on the terminal.
        !            73: %
        !            74: \def\gloggingall{\begingroup \globaldefs = 1 \loggingall \endgroup}%
        !            75: \def\loggingall{\tracingcommands2 \tracingstats2
        !            76:    \tracingpages1 \tracingoutput1 \tracinglostchars1
        !            77:    \tracingmacros2 \tracingparagraphs1 \tracingrestores1
        !            78:    \showboxbreadth\maxdimen\showboxdepth\maxdimen
        !            79: }%
        !            80: 
        !            81: %---------------------Begin change-----------------------
        !            82: %
        !            83: %%%% For @cropmarks command.
        !            84: % Dimensions to add cropmarks at corners Added by P. A. MacKay, 12 Nov. 1986
        !            85: %
        !            86: \newdimen\cornerlong \newdimen\cornerthick
        !            87: \newdimen \topandbottommargin
        !            88: \newdimen \outerhsize \newdimen \outervsize
        !            89: \cornerlong=1pc\cornerthick=.3pt       % These set size of cropmarks
        !            90: \outerhsize=7in
        !            91: %\outervsize=9.5in
        !            92: % Alternative @smallbook page size is 9.25in
        !            93: \outervsize=9.25in
        !            94: \topandbottommargin=.75in
        !            95: %
        !            96: %---------------------End change-----------------------
        !            97: 
        !            98: % \onepageout takes a vbox as an argument.  Note that \pagecontents
        !            99: % does insertions itself, but you have to call it yourself.
        !           100: \chardef\PAGE=255  \output={\onepageout{\pagecontents\PAGE}}
        !           101: \def\onepageout#1{\hoffset=\normaloffset
        !           102: \ifodd\pageno  \advance\hoffset by \bindingoffset
        !           103: \else \advance\hoffset by -\bindingoffset\fi
        !           104: {\escapechar=`\\\relax % makes sure backslash is used in output files.
        !           105: \shipout\vbox{{\let\hsize=\pagewidth \makeheadline} \pagebody{#1}%
        !           106: {\let\hsize=\pagewidth \makefootline}}}%
        !           107: \advancepageno \ifnum\outputpenalty>-20000 \else\dosupereject\fi}
        !           108: 
        !           109: %%%% For @cropmarks command %%%%
        !           110: 
        !           111: % Here is a modification of the main output routine for Near East Publications
        !           112: % This provides right-angle cropmarks at all four corners.
        !           113: % The contents of the page are centerlined into the cropmarks,
        !           114: % and any desired binding offset is added as an \hskip on either
        !           115: % site of the centerlined box.  (P. A. MacKay, 12 November, 1986)
        !           116: %
        !           117: \def\croppageout#1{\hoffset=0pt % make sure this doesn't mess things up
        !           118: {\escapechar=`\\\relax % makes sure backslash is used in output files.
        !           119:                 \shipout
        !           120:                 \vbox to \outervsize{\hsize=\outerhsize
        !           121:                  \vbox{\line{\ewtop\hfill\ewtop}}
        !           122:                  \nointerlineskip
        !           123:                  \line{\vbox{\moveleft\cornerthick\nstop}
        !           124:                        \hfill
        !           125:                        \vbox{\moveright\cornerthick\nstop}}
        !           126:                  \vskip \topandbottommargin
        !           127:                  \centerline{\ifodd\pageno\hskip\bindingoffset\fi
        !           128:                        \vbox{
        !           129:                        {\let\hsize=\pagewidth \makeheadline}
        !           130:                        \pagebody{#1}
        !           131:                        {\let\hsize=\pagewidth \makefootline}}
        !           132:                        \ifodd\pageno\else\hskip\bindingoffset\fi}
        !           133:                 \vskip \topandbottommargin plus1fill minus1fill
        !           134:                  \boxmaxdepth\cornerthick
        !           135:                  \line{\vbox{\moveleft\cornerthick\nsbot}
        !           136:                        \hfill
        !           137:                        \vbox{\moveright\cornerthick\nsbot}}
        !           138:                  \nointerlineskip
        !           139:                  \vbox{\line{\ewbot\hfill\ewbot}}
        !           140:        }}
        !           141:   \advancepageno
        !           142:   \ifnum\outputpenalty>-20000 \else\dosupereject\fi}
        !           143: %
        !           144: % Do @cropmarks to get crop marks
        !           145: \def\cropmarks{\let\onepageout=\croppageout }
        !           146: 
        !           147: \def\pagebody#1{\vbox to\pageheight{\boxmaxdepth=\maxdepth #1}}
        !           148: {\catcode`\@ =11
        !           149: \gdef\pagecontents#1{\ifvoid\topins\else\unvbox\topins\fi
        !           150: \dimen@=\dp#1 \unvbox#1
        !           151: \ifvoid\footins\else\vskip\skip\footins\footnoterule \unvbox\footins\fi
        !           152: \ifr@ggedbottom \kern-\dimen@ \vfil \fi}
        !           153: }
        !           154: 
        !           155: %
        !           156: % Here are the rules for the cropmarks.  Note that they are
        !           157: % offset so that the space between them is truly \outerhsize or \outervsize
        !           158: % (P. A. MacKay, 12 November, 1986)
        !           159: %
        !           160: \def\ewtop{\vrule height\cornerthick depth0pt width\cornerlong}
        !           161: \def\nstop{\vbox
        !           162:   {\hrule height\cornerthick depth\cornerlong width\cornerthick}}
        !           163: \def\ewbot{\vrule height0pt depth\cornerthick width\cornerlong}
        !           164: \def\nsbot{\vbox
        !           165:   {\hrule height\cornerlong depth\cornerthick width\cornerthick}}
        !           166: 
        !           167: % Parse an argument, then pass it to #1.  The argument is the rest of
        !           168: % the input line (except we remove a trailing comment).  #1 should be a
        !           169: % macro which expects an ordinary undelimited TeX argument.
        !           170: %
        !           171: \def\parsearg#1{%
        !           172:   \let\next = #1%
        !           173:   \begingroup
        !           174:     \obeylines
        !           175:     \futurelet\temp\parseargx
        !           176: }
        !           177: 
        !           178: % If the next token is an obeyed space (from an @example environment or
        !           179: % the like), remove it and recurse.  Otherwise, we're done.
        !           180: \def\parseargx{%
        !           181:   % \obeyedspace is defined far below, after the definition of \sepspaces.
        !           182:   \ifx\obeyedspace\temp
        !           183:     \expandafter\parseargdiscardspace
        !           184:   \else
        !           185:     \expandafter\parseargline
        !           186:   \fi
        !           187: }
        !           188: 
        !           189: % Remove a single space (as the delimiter token to the macro call).
        !           190: {\obeyspaces %
        !           191:  \gdef\parseargdiscardspace {\futurelet\temp\parseargx}}
        !           192: 
        !           193: {\obeylines %
        !           194:   \gdef\parseargline#1^^M{%
        !           195:     \endgroup % End of the group started in \parsearg.
        !           196:     %
        !           197:     % First remove any @c comment, then any @comment.
        !           198:     % Result of each macro is put in \toks0.
        !           199:     \argremovec #1\c\relax %
        !           200:     \expandafter\argremovecomment \the\toks0 \comment\relax %
        !           201:     %
        !           202:     % Call the caller's macro, saved as \next in \parsearg.
        !           203:     \expandafter\next\expandafter{\the\toks0}%
        !           204:   }%
        !           205: }
        !           206: 
        !           207: % Since all \c{,omment} does is throw away the argument, we can let TeX
        !           208: % do that for us.  The \relax here is matched by the \relax in the call
        !           209: % in \parseargline; it could be more or less anything, its purpose is
        !           210: % just to delimit the argument to the \c.
        !           211: \def\argremovec#1\c#2\relax{\toks0 = {#1}}
        !           212: \def\argremovecomment#1\comment#2\relax{\toks0 = {#1}}
        !           213: 
        !           214: % \argremovec{,omment} might leave us with trailing spaces, though; e.g.,
        !           215: %    @end itemize  @c foo
        !           216: % will have two active spaces as part of the argument with the
        !           217: % `itemize'.  Here we remove all active spaces from #1, and assign the
        !           218: % result to \toks0.
        !           219: %
        !           220: % This loses if there are any *other* active characters besides spaces
        !           221: % in the argument -- _ ^ +, for example -- since they get expanded.
        !           222: % Fortunately, Texinfo does not define any such commands.  (If it ever
        !           223: % does, the catcode of the characters in questionwill have to be changed
        !           224: % here.)  But this means we cannot call \removeactivespaces as part of
        !           225: % \argremovec{,omment}, since @c uses \parsearg, and thus the argument
        !           226: % that \parsearg gets might well have any character at all in it.
        !           227: %
        !           228: \def\removeactivespaces#1{%
        !           229:   \begingroup
        !           230:     \ignoreactivespaces
        !           231:     \edef\temp{#1}%
        !           232:     \global\toks0 = \expandafter{\temp}%
        !           233:   \endgroup
        !           234: }
        !           235: 
        !           236: % Change the active space to expand to nothing.
        !           237: %
        !           238: \begingroup
        !           239:   \obeyspaces
        !           240:   \gdef\ignoreactivespaces{\obeyspaces\let =\empty}
        !           241: \endgroup
        !           242: 
        !           243: 
        !           244: \def\flushcr{\ifx\par\lisppar \def\next##1{}\else \let\next=\relax \fi \next}
        !           245: 
        !           246: %% These are used to keep @begin/@end levels from running away
        !           247: %% Call \inENV within environments (after a \begingroup)
        !           248: \newif\ifENV \ENVfalse \def\inENV{\ifENV\relax\else\ENVtrue\fi}
        !           249: \def\ENVcheck{%
        !           250: \ifENV\errmessage{Still within an environment.  Type Return to continue.}
        !           251: \endgroup\fi} % This is not perfect, but it should reduce lossage
        !           252: 
        !           253: % @begin foo  is the same as @foo, for now.
        !           254: \newhelp\EMsimple{Type <Return> to continue.}
        !           255: 
        !           256: \outer\def\begin{\parsearg\beginxxx}
        !           257: 
        !           258: \def\beginxxx #1{%
        !           259: \expandafter\ifx\csname #1\endcsname\relax
        !           260: {\errhelp=\EMsimple \errmessage{Undefined command @begin #1}}\else
        !           261: \csname #1\endcsname\fi}
        !           262: 
        !           263: % @end foo executes the definition of \Efoo.
        !           264: %
        !           265: \def\end{\parsearg\endxxx}
        !           266: \def\endxxx #1{%
        !           267:   \removeactivespaces{#1}%
        !           268:   \edef\endthing{\the\toks0}%
        !           269:   %
        !           270:   \expandafter\ifx\csname E\endthing\endcsname\relax
        !           271:     \expandafter\ifx\csname \endthing\endcsname\relax
        !           272:       % There's no \foo, i.e., no ``environment'' foo.
        !           273:       \errhelp = \EMsimple
        !           274:       \errmessage{Undefined command `@end \endthing'}%
        !           275:     \else
        !           276:       \unmatchedenderror\endthing
        !           277:     \fi
        !           278:   \else
        !           279:     % Everything's ok; the right environment has been started.
        !           280:     \csname E\endthing\endcsname
        !           281:   \fi
        !           282: }
        !           283: 
        !           284: % There is an environment #1, but it hasn't been started.  Give an error.
        !           285: %
        !           286: \def\unmatchedenderror#1{%
        !           287:   \errhelp = \EMsimple
        !           288:   \errmessage{This `@end #1' doesn't have a matching `@#1'}%
        !           289: }
        !           290: 
        !           291: % Define the control sequence \E#1 to give an unmatched @end error.
        !           292: %
        !           293: \def\defineunmatchedend#1{%
        !           294:   \expandafter\def\csname E#1\endcsname{\unmatchedenderror{#1}}%
        !           295: }
        !           296: 
        !           297: 
        !           298: % Single-spacing is done by various environments (specifically, in
        !           299: % \nonfillstart and \quotations).
        !           300: \newskip\singlespaceskip \singlespaceskip = \baselineskip
        !           301: \def\singlespace{%
        !           302: % Why was this kern here?  It messes up equalizing space above and below
        !           303: % environments.  --karl, 6may93
        !           304: %{\advance \baselineskip by -\singlespaceskip
        !           305: %\kern \baselineskip}%
        !           306: \baselineskip=\singlespaceskip
        !           307: }
        !           308: 
        !           309: %% Simple single-character @ commands
        !           310: 
        !           311: % @@ prints an @
        !           312: % Kludge this until the fonts are right (grr).
        !           313: \def\@{{\tt \char '100}}
        !           314: 
        !           315: % This is turned off because it was never documented
        !           316: % and you can use @w{...} around a quote to suppress ligatures.
        !           317: %% Define @` and @' to be the same as ` and '
        !           318: %% but suppressing ligatures.
        !           319: %\def\`{{`}}
        !           320: %\def\'{{'}}
        !           321: 
        !           322: % Used to generate quoted braces.
        !           323: 
        !           324: \def\mylbrace {{\tt \char '173}}
        !           325: \def\myrbrace {{\tt \char '175}}
        !           326: \let\{=\mylbrace
        !           327: \let\}=\myrbrace
        !           328: 
        !           329: % @: forces normal size whitespace following.
        !           330: \def\:{\spacefactor=1000 }
        !           331: 
        !           332: % @* forces a line break.
        !           333: \def\*{\hfil\break\hbox{}\ignorespaces}
        !           334: 
        !           335: % @. is an end-of-sentence period.
        !           336: \def\.{.\spacefactor=3000 }
        !           337: 
        !           338: % @w prevents a word break.  Without the \leavevmode, @w at the
        !           339: % beginning of a paragraph, when TeX is still in vertical mode, would
        !           340: % produce a whole line of output instead of starting the paragraph.
        !           341: \def\w#1{\leavevmode\hbox{#1}}
        !           342: 
        !           343: % @group ... @end group forces ... to be all on one page, by enclosing
        !           344: % it in a TeX vbox.  We use \vtop instead of \vbox to construct the box
        !           345: % to keep its height that of a normal line.  According to the rules for
        !           346: % \topskip (p.114 of the TeXbook), the glue inserted is
        !           347: % max (\topskip - \ht (first item), 0).  If that height is large,
        !           348: % therefore, no glue is inserted, and the space between the headline and
        !           349: % the text is small, which looks bad.
        !           350: %
        !           351: \def\group{\begingroup
        !           352:   \ifnum\catcode13=\active \else
        !           353:     \errhelp = \groupinvalidhelp
        !           354:     \errmessage{@group invalid in context where filling is enabled}%
        !           355:   \fi
        !           356:   %
        !           357:   % The \vtop we start below produces a box with normal height and large
        !           358:   % depth; thus, TeX puts \baselineskip glue before it, and (when the
        !           359:   % next line of text is done) \lineskip glue after it.  (See p.82 of
        !           360:   % the TeXbook.)  Thus, space below is not quite equal to space
        !           361:   % above.  But it's pretty close.
        !           362:   \def\Egroup{%
        !           363:     \egroup           % End the \vtop.
        !           364:     \endgroup         % End the \group.
        !           365:   }%
        !           366:   %
        !           367:   \vtop\bgroup
        !           368:     % We have to put a strut on the last line in case the @group is in
        !           369:     % the midst of an example, rather than completely enclosing it.
        !           370:     % Otherwise, the interline space between the last line of the group
        !           371:     % and the first line afterwards is too small.  But we can't put the
        !           372:     % strut in \Egroup, since there it would be on a line by itself.
        !           373:     % Hence this just inserts a strut at the beginning of each line.
        !           374:     \everypar = {\strut}%
        !           375:     %
        !           376:     % Since we have a strut on every line, we don't need any of TeX's
        !           377:     % normal interline spacing.
        !           378:     \offinterlineskip
        !           379:     %
        !           380:     % OK, but now we have to do something about blank
        !           381:     % lines in the input in @example-like environments, which normally
        !           382:     % just turn into \lisppar, which will insert no space now that we've
        !           383:     % turned off the interline space.  Simplest is to make them be an
        !           384:     % empty paragraph.
        !           385:     \ifx\par\lisppar
        !           386:       \edef\par{\leavevmode \par}%
        !           387:       %
        !           388:       % Reset ^^M's definition to new definition of \par.
        !           389:       \obeylines
        !           390:     \fi
        !           391:     %
        !           392:     % We do @comment here in case we are called inside an environment,
        !           393:     % such as @example, where each end-of-line in the input causes an
        !           394:     % end-of-line in the output.  We don't want the end-of-line after
        !           395:     % the `@group' to put extra space in the output.  Since @group
        !           396:     % should appear on a line by itself (according to the Texinfo
        !           397:     % manual), we don't worry about eating any user text.
        !           398:     \comment
        !           399: }
        !           400: %
        !           401: % TeX puts in an \escapechar (i.e., `@') at the beginning of the help
        !           402: % message, so this ends up printing `@group can only ...'.
        !           403: %
        !           404: \newhelp\groupinvalidhelp{%
        !           405: group can only be used in environments such as @example,^^J%
        !           406: where each line of input produces a line of output.}
        !           407: 
        !           408: % @need space-in-mils
        !           409: % forces a page break if there is not space-in-mils remaining.
        !           410: 
        !           411: \newdimen\mil  \mil=0.001in
        !           412: 
        !           413: \def\need{\parsearg\needx}
        !           414: 
        !           415: % Old definition--didn't work.
        !           416: %\def\needx #1{\par %
        !           417: %% This method tries to make TeX break the page naturally
        !           418: %% if the depth of the box does not fit.
        !           419: %{\baselineskip=0pt%
        !           420: %\vtop to #1\mil{\vfil}\kern -#1\mil\penalty 10000
        !           421: %\prevdepth=-1000pt
        !           422: %}}
        !           423: 
        !           424: \def\needx#1{%
        !           425:   % Go into vertical mode, so we don't make a big box in the middle of a
        !           426:   % paragraph.
        !           427:   \par
        !           428:   %
        !           429:   % Don't add any leading before our big empty box, but allow a page
        !           430:   % break, since the best break might be right here.
        !           431:   \allowbreak
        !           432:   \nointerlineskip
        !           433:   \vtop to #1\mil{\vfil}%
        !           434:   %
        !           435:   % TeX does not even consider page breaks if a penalty added to the
        !           436:   % main vertical list is 10000 or more.  But in order to see if the
        !           437:   % empty box we just added fits on the page, we must make it consider
        !           438:   % page breaks.  On the other hand, we don't want to actually break the
        !           439:   % page after the empty box.  So we use a penalty of 9999.
        !           440:   %
        !           441:   % There is an extremely small chance that TeX will actually break the
        !           442:   % page at this \penalty, if there are no other feasible breakpoints in
        !           443:   % sight.  (If the user is using lots of big @group commands, which
        !           444:   % almost-but-not-quite fill up a page, TeX will have a hard time doing
        !           445:   % good page breaking, for example.)  However, I could not construct an
        !           446:   % example where a page broke at this \penalty; if it happens in a real
        !           447:   % document, then we can reconsider our strategy.
        !           448:   \penalty9999
        !           449:   %
        !           450:   % Back up by the size of the box, whether we did a page break or not.
        !           451:   \kern -#1\mil
        !           452:   %
        !           453:   % Do not allow a page break right after this kern.
        !           454:   \nobreak
        !           455: }
        !           456: 
        !           457: % @br   forces paragraph break
        !           458: 
        !           459: \let\br = \par
        !           460: 
        !           461: % @dots{}  output some dots
        !           462: 
        !           463: \def\dots{$\ldots$}
        !           464: 
        !           465: % @page    forces the start of a new page
        !           466: 
        !           467: \def\page{\par\vfill\supereject}
        !           468: 
        !           469: % @exdent text....
        !           470: % outputs text on separate line in roman font, starting at standard page margin
        !           471: 
        !           472: % This records the amount of indent in the innermost environment.
        !           473: % That's how much \exdent should take out.
        !           474: \newskip\exdentamount
        !           475: 
        !           476: % This defn is used inside fill environments such as @defun.
        !           477: \def\exdent{\parsearg\exdentyyy}
        !           478: \def\exdentyyy #1{{\hfil\break\hbox{\kern -\exdentamount{\rm#1}}\hfil\break}}
        !           479: 
        !           480: % This defn is used inside nofill environments such as @example.
        !           481: \def\nofillexdent{\parsearg\nofillexdentyyy}
        !           482: \def\nofillexdentyyy #1{{\advance \leftskip by -\exdentamount
        !           483: \leftline{\hskip\leftskip{\rm#1}}}}
        !           484: 
        !           485: %\hbox{{\rm#1}}\hfil\break}}
        !           486: 
        !           487: % @include file    insert text of that file as input.
        !           488: 
        !           489: \def\include{\parsearg\includezzz}
        !           490: %Use \input\thisfile to avoid blank after \input, which may be an active
        !           491: %char (in which case the blank would become the \input argument).
        !           492: %The grouping keeps the value of \thisfile correct even when @include
        !           493: %is nested.
        !           494: \def\includezzz #1{\begingroup
        !           495: \def\thisfile{#1}\input\thisfile
        !           496: \endgroup}
        !           497: 
        !           498: \def\thisfile{}
        !           499: 
        !           500: % @center line   outputs that line, centered
        !           501: 
        !           502: \def\center{\parsearg\centerzzz}
        !           503: \def\centerzzz #1{{\advance\hsize by -\leftskip
        !           504: \advance\hsize by -\rightskip
        !           505: \centerline{#1}}}
        !           506: 
        !           507: % @sp n   outputs n lines of vertical space
        !           508: 
        !           509: \def\sp{\parsearg\spxxx}
        !           510: \def\spxxx #1{\par \vskip #1\baselineskip}
        !           511: 
        !           512: % @comment ...line which is ignored...
        !           513: % @c is the same as @comment
        !           514: % @ignore ... @end ignore  is another way to write a comment
        !           515: 
        !           516: \def\comment{\catcode 64=\other \catcode 123=\other \catcode 125=\other%
        !           517: \parsearg \commentxxx}
        !           518: 
        !           519: \def\commentxxx #1{\catcode 64=0 \catcode 123=1 \catcode 125=2 }
        !           520: 
        !           521: \let\c=\comment
        !           522: 
        !           523: % Prevent errors for section commands.
        !           524: % Used in @ignore and in failing conditionals.
        !           525: \def\ignoresections{%
        !           526: \let\chapter=\relax
        !           527: \let\unnumbered=\relax
        !           528: \let\top=\relax
        !           529: \let\unnumberedsec=\relax
        !           530: \let\unnumberedsection=\relax
        !           531: \let\unnumberedsubsec=\relax
        !           532: \let\unnumberedsubsection=\relax
        !           533: \let\unnumberedsubsubsec=\relax
        !           534: \let\unnumberedsubsubsection=\relax
        !           535: \let\section=\relax
        !           536: \let\subsec=\relax
        !           537: \let\subsubsec=\relax
        !           538: \let\subsection=\relax
        !           539: \let\subsubsection=\relax
        !           540: \let\appendix=\relax
        !           541: \let\appendixsec=\relax
        !           542: \let\appendixsection=\relax
        !           543: \let\appendixsubsec=\relax
        !           544: \let\appendixsubsection=\relax
        !           545: \let\appendixsubsubsec=\relax
        !           546: \let\appendixsubsubsection=\relax
        !           547: \let\contents=\relax
        !           548: \let\smallbook=\relax
        !           549: \let\titlepage=\relax
        !           550: }
        !           551: 
        !           552: % Used in nested conditionals, where we have to parse the Texinfo source
        !           553: % and so want to turn off most commands, in case they are used
        !           554: % incorrectly.
        !           555: %
        !           556: \def\ignoremorecommands{%
        !           557:   \let\defcv = \relax
        !           558:   \let\deffn = \relax
        !           559:   \let\deffnx = \relax
        !           560:   \let\defindex = \relax
        !           561:   \let\defivar = \relax
        !           562:   \let\defmac = \relax
        !           563:   \let\defmethod = \relax
        !           564:   \let\defop = \relax
        !           565:   \let\defopt = \relax
        !           566:   \let\defspec = \relax
        !           567:   \let\deftp = \relax
        !           568:   \let\deftypefn = \relax
        !           569:   \let\deftypefun = \relax
        !           570:   \let\deftypevar = \relax
        !           571:   \let\deftypevr = \relax
        !           572:   \let\defun = \relax
        !           573:   \let\defvar = \relax
        !           574:   \let\defvr = \relax
        !           575:   \let\ref = \relax
        !           576:   \let\xref = \relax
        !           577:   \let\printindex = \relax
        !           578:   \let\pxref = \relax
        !           579:   \let\settitle = \relax
        !           580:   \let\include = \relax
        !           581:   \let\lowersections = \relax
        !           582:   \let\down = \relax
        !           583:   \let\raisesections = \relax
        !           584:   \let\up = \relax
        !           585:   \let\set = \relax
        !           586:   \let\clear = \relax
        !           587: }
        !           588: 
        !           589: % Ignore @ignore ... @end ignore.
        !           590: %
        !           591: \def\ignore{\doignore{ignore}}
        !           592: 
        !           593: % Also ignore @ifinfo, @menu, and @direntry text.
        !           594: %
        !           595: \def\ifinfo{\doignore{ifinfo}}
        !           596: \def\menu{\doignore{menu}}
        !           597: \def\direntry{\doignore{direntry}}
        !           598: 
        !           599: % Ignore text until a line `@end #1'.
        !           600: %
        !           601: \def\doignore#1{\begingroup
        !           602:   % Don't complain about control sequences we have declared \outer.
        !           603:   \ignoresections
        !           604:   %
        !           605:   % Define a command to swallow text until we reach `@end #1'.
        !           606:   \long\def\doignoretext##1\end #1{\enddoignore}%
        !           607:   %
        !           608:   % Make sure that spaces turn into tokens that match what \doignoretext wants.
        !           609:   \catcode32 = 10
        !           610:   %
        !           611:   % And now expand that command.
        !           612:   \doignoretext
        !           613: }
        !           614: 
        !           615: % What we do to finish off ignored text.
        !           616: %
        !           617: \def\enddoignore{\endgroup\ignorespaces}%
        !           618: 
        !           619: \newif\ifwarnedobs\warnedobsfalse
        !           620: \def\obstexwarn{%
        !           621:   \ifwarnedobs\relax\else
        !           622:   % We need to warn folks that they may have trouble with TeX 3.0.
        !           623:   % This uses \immediate\write16 rather than \message to get newlines.
        !           624:     \immediate\write16{}
        !           625:     \immediate\write16{***WARNING*** for users of Unix TeX 3.0!}
        !           626:     \immediate\write16{This manual trips a bug in TeX version 3.0 (tex hangs).}
        !           627:     \immediate\write16{If you are running another version of TeX, relax.}
        !           628:     \immediate\write16{If you are running Unix TeX 3.0, kill this TeX process.}
        !           629:     \immediate\write16{  Then upgrade your TeX installation if you can.}
        !           630:     \immediate\write16{If you are stuck with version 3.0, run the}
        !           631:     \immediate\write16{  script ``tex3patch'' from the Texinfo distribution}
        !           632:     \immediate\write16{  to use a workaround.}
        !           633:     \immediate\write16{}
        !           634:     \warnedobstrue
        !           635:     \fi
        !           636: }
        !           637: 
        !           638: % **In TeX 3.0, setting text in \nullfont hangs tex.  For a
        !           639: % workaround (which requires the file ``dummy.tfm'' to be installed),
        !           640: % uncomment the following line:
        !           641: %%%%%\font\nullfont=dummy\let\obstexwarn=\relax
        !           642: 
        !           643: % Ignore text, except that we keep track of conditional commands for
        !           644: % purposes of nesting, up to an `@end #1' command.
        !           645: %
        !           646: \def\nestedignore#1{%
        !           647:   \obstexwarn
        !           648:   % We must actually expand the ignored text to look for the @end
        !           649:   % command, so that nested ignore constructs work.  Thus, we put the
        !           650:   % text into a \vbox and then do nothing with the result.  To minimize
        !           651:   % the change of memory overflow, we follow the approach outlined on
        !           652:   % page 401 of the TeXbook: make the current font be a dummy font.
        !           653:   %
        !           654:   \setbox0 = \vbox\bgroup
        !           655:     % Don't complain about control sequences we have declared \outer.
        !           656:     \ignoresections
        !           657:     %
        !           658:     % Define `@end #1' to end the box, which will in turn undefine the
        !           659:     % @end command again.
        !           660:     \expandafter\def\csname E#1\endcsname{\egroup\ignorespaces}%
        !           661:     %
        !           662:     % We are going to be parsing Texinfo commands.  Most cause no
        !           663:     % trouble when they are used incorrectly, but some commands do
        !           664:     % complicated argument parsing or otherwise get confused, so we
        !           665:     % undefine them.
        !           666:     %
        !           667:     % We can't do anything about stray @-signs, unfortunately;
        !           668:     % they'll produce `undefined control sequence' errors.
        !           669:     \ignoremorecommands
        !           670:     %
        !           671:     % Set the current font to be \nullfont, a TeX primitive, and define
        !           672:     % all the font commands to also use \nullfont.  We don't use
        !           673:     % dummy.tfm, as suggested in the TeXbook, because not all sites
        !           674:     % might have that installed.  Therefore, math mode will still
        !           675:     % produce output, but that should be an extremely small amount of
        !           676:     % stuff compared to the main input.
        !           677:     %
        !           678:     \nullfont
        !           679:     \let\tenrm = \nullfont  \let\tenit = \nullfont  \let\tensl = \nullfont
        !           680:     \let\tenbf = \nullfont  \let\tentt = \nullfont  \let\smallcaps = \nullfont
        !           681:     \let\tensf = \nullfont
        !           682:     % Similarly for index fonts (mostly for their use in
        !           683:     % smallexample)
        !           684:     \let\indrm = \nullfont  \let\indit = \nullfont  \let\indsl = \nullfont
        !           685:     \let\indbf = \nullfont  \let\indtt = \nullfont  \let\indsc = \nullfont
        !           686:     \let\indsf = \nullfont
        !           687:     %
        !           688:     % Don't complain when characters are missing from the fonts.
        !           689:     \tracinglostchars = 0
        !           690:     %
        !           691:     % Don't bother to do space factor calculations.
        !           692:     \frenchspacing
        !           693:     %
        !           694:     % Don't report underfull hboxes.
        !           695:     \hbadness = 10000
        !           696:     %
        !           697:     % Do minimal line-breaking.
        !           698:     \pretolerance = 10000
        !           699:     %
        !           700:     % Do not execute instructions in @tex
        !           701:     \def\tex{\doignore{tex}}
        !           702: }
        !           703: 
        !           704: % @set VAR sets the variable VAR to an empty value.
        !           705: % @set VAR REST-OF-LINE sets VAR to the value REST-OF-LINE.
        !           706: %
        !           707: % Since we want to separate VAR from REST-OF-LINE (which might be
        !           708: % empty), we can't just use \parsearg; we have to insert a space of our
        !           709: % own to delimit the rest of the line, and then take it out again if we
        !           710: % didn't need it.
        !           711: %
        !           712: \def\set{\parsearg\setxxx}
        !           713: \def\setxxx#1{\setyyy#1 \endsetyyy}
        !           714: \def\setyyy#1 #2\endsetyyy{%
        !           715:   \def\temp{#2}%
        !           716:   \ifx\temp\empty \global\expandafter\let\csname SET#1\endcsname = \empty
        !           717:   \else \setzzz{#1}#2\endsetzzz % Remove the trailing space \setxxx inserted.
        !           718:   \fi
        !           719: }
        !           720: \def\setzzz#1#2 \endsetzzz{\expandafter\xdef\csname SET#1\endcsname{#2}}
        !           721: 
        !           722: % @clear VAR clears (i.e., unsets) the variable VAR.
        !           723: %
        !           724: \def\clear{\parsearg\clearxxx}
        !           725: \def\clearxxx#1{\global\expandafter\let\csname SET#1\endcsname=\relax}
        !           726: 
        !           727: % @value{foo} gets the text saved in variable foo.
        !           728: %
        !           729: \def\value#1{\expandafter
        !           730:                \ifx\csname SET#1\endcsname\relax
        !           731:                        {\{No value for ``#1''\}}
        !           732:                \else \csname SET#1\endcsname \fi}
        !           733: 
        !           734: % @ifset VAR ... @end ifset reads the `...' iff VAR has been defined
        !           735: % with @set.
        !           736: %
        !           737: \def\ifset{\parsearg\ifsetxxx}
        !           738: \def\ifsetxxx #1{%
        !           739:   \expandafter\ifx\csname SET#1\endcsname\relax
        !           740:     \expandafter\ifsetfail
        !           741:   \else
        !           742:     \expandafter\ifsetsucceed
        !           743:   \fi
        !           744: }
        !           745: \def\ifsetsucceed{\conditionalsucceed{ifset}}
        !           746: \def\ifsetfail{\nestedignore{ifset}}
        !           747: \defineunmatchedend{ifset}
        !           748: 
        !           749: % @ifclear VAR ... @end ifclear reads the `...' iff VAR has never been
        !           750: % defined with @set, or has been undefined with @clear.
        !           751: %
        !           752: \def\ifclear{\parsearg\ifclearxxx}
        !           753: \def\ifclearxxx #1{%
        !           754:   \expandafter\ifx\csname SET#1\endcsname\relax
        !           755:     \expandafter\ifclearsucceed
        !           756:   \else
        !           757:     \expandafter\ifclearfail
        !           758:   \fi
        !           759: }
        !           760: \def\ifclearsucceed{\conditionalsucceed{ifclear}}
        !           761: \def\ifclearfail{\nestedignore{ifclear}}
        !           762: \defineunmatchedend{ifclear}
        !           763: 
        !           764: % @iftex always succeeds; we read the text following, through @end
        !           765: % iftex).  But `@end iftex' should be valid only after an @iftex.
        !           766: %
        !           767: \def\iftex{\conditionalsucceed{iftex}}
        !           768: \defineunmatchedend{iftex}
        !           769: 
        !           770: % We can't just want to start a group at @iftex (for example) and end it
        !           771: % at @end iftex, since then @set commands inside the conditional have no
        !           772: % effect (they'd get reverted at the end of the group).  So we must
        !           773: % define \Eiftex to redefine itself to be its previous value.  (We can't
        !           774: % just define it to fail again with an ``unmatched end'' error, since
        !           775: % the @ifset might be nested.)
        !           776: %
        !           777: \def\conditionalsucceed#1{%
        !           778:   \edef\temp{%
        !           779:     % Remember the current value of \E#1.
        !           780:     \let\nece{prevE#1} = \nece{E#1}%
        !           781:     %
        !           782:     % At the `@end #1', redefine \E#1 to be its previous value.
        !           783:     \def\nece{E#1}{\let\nece{E#1} = \nece{prevE#1}}%
        !           784:   }%
        !           785:   \temp
        !           786: }
        !           787: 
        !           788: % We need to expand lots of \csname's, but we don't want to expand the
        !           789: % control sequences after we've constructed them.
        !           790: %
        !           791: \def\nece#1{\expandafter\noexpand\csname#1\endcsname}
        !           792: 
        !           793: % @asis just yields its argument.  Used with @table, for example.
        !           794: %
        !           795: \def\asis#1{#1}
        !           796: 
        !           797: % @math means output in math mode.
        !           798: % We don't use $'s directly in the definition of \math because control
        !           799: % sequences like \math are expanded when the toc file is written.  Then,
        !           800: % we read the toc file back, the $'s will be normal characters (as they
        !           801: % should be, according to the definition of Texinfo).  So we must use a
        !           802: % control sequence to switch into and out of math mode.
        !           803: %
        !           804: % This isn't quite enough for @math to work properly in indices, but it
        !           805: % seems unlikely it will ever be needed there.
        !           806: %
        !           807: \let\implicitmath = $
        !           808: \def\math#1{\implicitmath #1\implicitmath}
        !           809: 
        !           810: % @bullet and @minus need the same treatment as @math, just above.
        !           811: \def\bullet{\implicitmath\ptexbullet\implicitmath}
        !           812: \def\minus{\implicitmath-\implicitmath}
        !           813: 
        !           814: \def\node{\ENVcheck\parsearg\nodezzz}
        !           815: \def\nodezzz#1{\nodexxx [#1,]}
        !           816: \def\nodexxx[#1,#2]{\gdef\lastnode{#1}}
        !           817: \let\nwnode=\node
        !           818: \let\lastnode=\relax
        !           819: 
        !           820: \def\donoderef{\ifx\lastnode\relax\else
        !           821: \expandafter\expandafter\expandafter\setref{\lastnode}\fi
        !           822: \let\lastnode=\relax}
        !           823: 
        !           824: \def\unnumbnoderef{\ifx\lastnode\relax\else
        !           825: \expandafter\expandafter\expandafter\unnumbsetref{\lastnode}\fi
        !           826: \let\lastnode=\relax}
        !           827: 
        !           828: \def\appendixnoderef{\ifx\lastnode\relax\else
        !           829: \expandafter\expandafter\expandafter\appendixsetref{\lastnode}\fi
        !           830: \let\lastnode=\relax}
        !           831: 
        !           832: \let\refill=\relax
        !           833: 
        !           834: % @setfilename is done at the beginning of every texinfo file.
        !           835: % So open here the files we need to have open while reading the input.
        !           836: % This makes it possible to make a .fmt file for texinfo.
        !           837: \def\setfilename{%
        !           838:    \readauxfile
        !           839:    \opencontents
        !           840:    \openindices
        !           841:    \fixbackslash  % Turn off hack to swallow `\input texinfo'.
        !           842:    \global\let\setfilename=\comment % Ignore extra @setfilename cmds.
        !           843:    \comment % Ignore the actual filename.
        !           844: }
        !           845: 
        !           846: \outer\def\bye{\pagealignmacro\tracingstats=1\ptexend}
        !           847: 
        !           848: \def\inforef #1{\inforefzzz #1,,,,**}
        !           849: \def\inforefzzz #1,#2,#3,#4**{See Info file \file{\ignorespaces #3{}},
        !           850:   node \samp{\ignorespaces#1{}}}
        !           851: 
        !           852: \message{fonts,}
        !           853: 
        !           854: % Font-change commands.
        !           855: 
        !           856: % Texinfo supports the sans serif font style, which plain TeX does not.
        !           857: % So we set up a \sf analogous to plain's \rm, etc.
        !           858: \newfam\sffam
        !           859: \def\sf{\fam=\sffam \tensf}
        !           860: \let\li = \sf % Sometimes we call it \li, not \sf.
        !           861: 
        !           862: %% Try out Computer Modern fonts at \magstephalf
        !           863: \let\mainmagstep=\magstephalf
        !           864: 
        !           865: \ifx\bigger\relax
        !           866: \let\mainmagstep=\magstep1
        !           867: \font\textrm=cmr12
        !           868: \font\texttt=cmtt12
        !           869: \else
        !           870: \font\textrm=cmr10 scaled \mainmagstep
        !           871: \font\texttt=cmtt10 scaled \mainmagstep
        !           872: \fi
        !           873: % Instead of cmb10, you many want to use cmbx10.
        !           874: % cmbx10 is a prettier font on its own, but cmb10
        !           875: % looks better when embedded in a line with cmr10.
        !           876: \font\textbf=cmb10 scaled \mainmagstep
        !           877: \font\textit=cmti10 scaled \mainmagstep
        !           878: \font\textsl=cmsl10 scaled \mainmagstep
        !           879: \font\textsf=cmss10 scaled \mainmagstep
        !           880: \font\textsc=cmcsc10 scaled \mainmagstep
        !           881: \font\texti=cmmi10 scaled \mainmagstep
        !           882: \font\textsy=cmsy10 scaled \mainmagstep
        !           883: 
        !           884: % A few fonts for @defun, etc.
        !           885: \font\defbf=cmbx10 scaled \magstep1 %was 1314
        !           886: \font\deftt=cmtt10 scaled \magstep1
        !           887: \def\df{\let\tentt=\deftt \let\tenbf = \defbf \bf}
        !           888: 
        !           889: % Fonts for indices and small examples.
        !           890: % We actually use the slanted font rather than the italic,
        !           891: % because texinfo normally uses the slanted fonts for that.
        !           892: % Do not make many font distinctions in general in the index, since they
        !           893: % aren't very useful.
        !           894: \font\ninett=cmtt9
        !           895: \font\indrm=cmr9
        !           896: \font\indit=cmsl9
        !           897: \let\indsl=\indit
        !           898: \let\indtt=\ninett
        !           899: \let\indsf=\indrm
        !           900: \let\indbf=\indrm
        !           901: \let\indsc=\indrm
        !           902: \font\indi=cmmi9
        !           903: \font\indsy=cmsy9
        !           904: 
        !           905: % Fonts for headings
        !           906: \font\chaprm=cmbx12 scaled \magstep2
        !           907: \font\chapit=cmti12 scaled \magstep2
        !           908: \font\chapsl=cmsl12 scaled \magstep2
        !           909: \font\chaptt=cmtt12 scaled \magstep2
        !           910: \font\chapsf=cmss12 scaled \magstep2
        !           911: \let\chapbf=\chaprm
        !           912: \font\chapsc=cmcsc10 scaled\magstep3
        !           913: \font\chapi=cmmi12 scaled \magstep2
        !           914: \font\chapsy=cmsy10 scaled \magstep3
        !           915: 
        !           916: \font\secrm=cmbx12 scaled \magstep1
        !           917: \font\secit=cmti12 scaled \magstep1
        !           918: \font\secsl=cmsl12 scaled \magstep1
        !           919: \font\sectt=cmtt12 scaled \magstep1
        !           920: \font\secsf=cmss12 scaled \magstep1
        !           921: \font\secbf=cmbx12 scaled \magstep1
        !           922: \font\secsc=cmcsc10 scaled\magstep2
        !           923: \font\seci=cmmi12 scaled \magstep1
        !           924: \font\secsy=cmsy10 scaled \magstep2
        !           925: 
        !           926: % \font\ssecrm=cmbx10 scaled \magstep1    % This size an font looked bad.
        !           927: % \font\ssecit=cmti10 scaled \magstep1    % The letters were too crowded.
        !           928: % \font\ssecsl=cmsl10 scaled \magstep1
        !           929: % \font\ssectt=cmtt10 scaled \magstep1
        !           930: % \font\ssecsf=cmss10 scaled \magstep1
        !           931: 
        !           932: %\font\ssecrm=cmb10 scaled 1315        % Note the use of cmb rather than cmbx.
        !           933: %\font\ssecit=cmti10 scaled 1315       % Also, the size is a little larger than
        !           934: %\font\ssecsl=cmsl10 scaled 1315       % being scaled magstep1.
        !           935: %\font\ssectt=cmtt10 scaled 1315
        !           936: %\font\ssecsf=cmss10 scaled 1315
        !           937: 
        !           938: %\let\ssecbf=\ssecrm
        !           939: 
        !           940: \font\ssecrm=cmbx12 scaled \magstephalf
        !           941: \font\ssecit=cmti12 scaled \magstephalf
        !           942: \font\ssecsl=cmsl12 scaled \magstephalf
        !           943: \font\ssectt=cmtt12 scaled \magstephalf
        !           944: \font\ssecsf=cmss12 scaled \magstephalf
        !           945: \font\ssecbf=cmbx12 scaled \magstephalf
        !           946: \font\ssecsc=cmcsc10 scaled \magstep1
        !           947: \font\sseci=cmmi12 scaled \magstephalf
        !           948: \font\ssecsy=cmsy10 scaled \magstep1
        !           949: % The smallcaps and symbol fonts should actually be scaled \magstep1.5,
        !           950: % but that is not a standard magnification.
        !           951: 
        !           952: % Fonts for title page:
        !           953: \font\titlerm = cmbx12 scaled \magstep3
        !           954: \let\authorrm = \secrm
        !           955: 
        !           956: % In order for the font changes to affect most math symbols and letters,
        !           957: % we have to define the \textfont of the standard families.  Since
        !           958: % texinfo doesn't allow for producing subscripts and superscripts, we
        !           959: % don't bother to reset \scriptfont and \scriptscriptfont (which would
        !           960: % also require loading a lot more fonts).
        !           961: %
        !           962: \def\resetmathfonts{%
        !           963:   \textfont0 = \tenrm \textfont1 = \teni \textfont2 = \tensy
        !           964:   \textfont\itfam = \tenit \textfont\slfam = \tensl \textfont\bffam = \tenbf
        !           965:   \textfont\ttfam = \tentt \textfont\sffam = \tensf
        !           966: }
        !           967: 
        !           968: 
        !           969: % The font-changing commands redefine the meanings of \tenSTYLE, instead
        !           970: % of just \STYLE.  We do this so that font changes will continue to work
        !           971: % in math mode, where it is the current \fam that is relevant in most
        !           972: % cases, not the current.  Plain TeX does, for example,
        !           973: % \def\bf{\fam=\bffam \tenbf}  By redefining \tenbf, we obviate the need
        !           974: % to redefine \bf itself.
        !           975: \def\textfonts{%
        !           976:   \let\tenrm=\textrm \let\tenit=\textit \let\tensl=\textsl
        !           977:   \let\tenbf=\textbf \let\tentt=\texttt \let\smallcaps=\textsc
        !           978:   \let\tensf=\textsf \let\teni=\texti \let\tensy=\textsy
        !           979:   \resetmathfonts}
        !           980: \def\chapfonts{%
        !           981:   \let\tenrm=\chaprm \let\tenit=\chapit \let\tensl=\chapsl
        !           982:   \let\tenbf=\chapbf \let\tentt=\chaptt \let\smallcaps=\chapsc
        !           983:   \let\tensf=\chapsf \let\teni=\chapi \let\tensy=\chapsy
        !           984:   \resetmathfonts}
        !           985: \def\secfonts{%
        !           986:   \let\tenrm=\secrm \let\tenit=\secit \let\tensl=\secsl
        !           987:   \let\tenbf=\secbf \let\tentt=\sectt \let\smallcaps=\secsc
        !           988:   \let\tensf=\secsf \let\teni=\seci \let\tensy=\secsy
        !           989:   \resetmathfonts}
        !           990: \def\subsecfonts{%
        !           991:   \let\tenrm=\ssecrm \let\tenit=\ssecit \let\tensl=\ssecsl
        !           992:   \let\tenbf=\ssecbf \let\tentt=\ssectt \let\smallcaps=\ssecsc
        !           993:   \let\tensf=\ssecsf \let\teni=\sseci \let\tensy=\ssecsy
        !           994:   \resetmathfonts}
        !           995: \def\indexfonts{%
        !           996:   \let\tenrm=\indrm \let\tenit=\indit \let\tensl=\indsl
        !           997:   \let\tenbf=\indbf \let\tentt=\indtt \let\smallcaps=\indsc
        !           998:   \let\tensf=\indsf \let\teni=\indi \let\tensy=\indsy
        !           999:   \resetmathfonts}
        !          1000: 
        !          1001: % Set up the default fonts, so we can use them for creating boxes.
        !          1002: %
        !          1003: \textfonts
        !          1004: 
        !          1005: % Count depth in font-changes, for error checks
        !          1006: \newcount\fontdepth \fontdepth=0
        !          1007: 
        !          1008: % Fonts for short table of contents.
        !          1009: \font\shortcontrm=cmr12
        !          1010: \font\shortcontbf=cmbx12
        !          1011: \font\shortcontsl=cmsl12
        !          1012: 
        !          1013: %% Add scribe-like font environments, plus @l for inline lisp (usually sans
        !          1014: %% serif) and @ii for TeX italic
        !          1015: 
        !          1016: % \smartitalic{ARG} outputs arg in italics, followed by an italic correction
        !          1017: % unless the following character is such as not to need one.
        !          1018: \def\smartitalicx{\ifx\next,\else\ifx\next-\else\ifx\next.\else\/\fi\fi\fi}
        !          1019: \def\smartitalic#1{{\sl #1}\futurelet\next\smartitalicx}
        !          1020: 
        !          1021: \let\i=\smartitalic
        !          1022: \let\var=\smartitalic
        !          1023: \let\dfn=\smartitalic
        !          1024: \let\emph=\smartitalic
        !          1025: \let\cite=\smartitalic
        !          1026: 
        !          1027: \def\b#1{{\bf #1}}
        !          1028: \let\strong=\b
        !          1029: 
        !          1030: % We can't just use \exhyphenpenalty, because that only has effect at
        !          1031: % the end of a paragraph.  Restore normal hyphenation at the end of the
        !          1032: % group within which \nohyphenation is presumably called.
        !          1033: %
        !          1034: \def\nohyphenation{\hyphenchar\font = -1  \aftergroup\restorehyphenation}
        !          1035: \def\restorehyphenation{\hyphenchar\font = `- }
        !          1036: 
        !          1037: \def\t#1{%
        !          1038:   {\tt \nohyphenation \rawbackslash \frenchspacing #1}%
        !          1039:   \null
        !          1040: }
        !          1041: \let\ttfont = \t
        !          1042: %\def\samp #1{`{\tt \rawbackslash \frenchspacing #1}'\null}
        !          1043: \def\samp #1{`\tclose{#1}'\null}
        !          1044: \def\key #1{{\tt \nohyphenation \uppercase{#1}}\null}
        !          1045: \def\ctrl #1{{\tt \rawbackslash \hat}#1}
        !          1046: 
        !          1047: \let\file=\samp
        !          1048: 
        !          1049: % @code is a modification of @t,
        !          1050: % which makes spaces the same size as normal in the surrounding text.
        !          1051: \def\tclose#1{%
        !          1052:   {%
        !          1053:     % Change normal interword space to be same as for the current font.
        !          1054:     \spaceskip = \fontdimen2\font
        !          1055:     %
        !          1056:     % Switch to typewriter.
        !          1057:     \tt
        !          1058:     %
        !          1059:     % But `\ ' produces the large typewriter interword space.
        !          1060:     \def\ {{\spaceskip = 0pt{} }}%
        !          1061:     %
        !          1062:     % Turn off hyphenation.
        !          1063:     \nohyphenation
        !          1064:     %
        !          1065:     \rawbackslash
        !          1066:     \frenchspacing
        !          1067:     #1%
        !          1068:   }%
        !          1069:   \null
        !          1070: }
        !          1071: 
        !          1072: % We *must* turn on hyphenation at `-' and `_' in \code.
        !          1073: % Otherwise, it is too hard to avoid overful hboxes
        !          1074: % in the Emacs manual, the Library manual, etc.
        !          1075: 
        !          1076: % Unfortunately, TeX uses one parameter (\hyphenchar) to control
        !          1077: % both hyphenation at - and hyphenation within words.
        !          1078: % We must therefore turn them both off (\tclose does that)
        !          1079: % and arrange explicitly to hyphenate an a dash.
        !          1080: %  -- rms.
        !          1081: {
        !          1082: \catcode `\-=\active
        !          1083: \catcode `\_=\active
        !          1084: \global\def\code{\begingroup \catcode `\-=\active \let-\codedash \let_\codeunder \codex}
        !          1085: }
        !          1086: \def\codedash{-\discretionary{}{}{}}
        !          1087: \def\codeunder{\normalunderscore\discretionary{}{}{}}
        !          1088: \def\codex #1{\tclose{#1}\endgroup}
        !          1089: 
        !          1090: %\let\exp=\tclose  %Was temporary
        !          1091: 
        !          1092: % @kbd is like @code, except that if the argument is just one @key command,
        !          1093: % then @kbd has no effect.
        !          1094: 
        !          1095: \def\xkey{\key}
        !          1096: \def\kbdfoo#1#2#3\par{\def\one{#1}\def\three{#3}\def\threex{??}%
        !          1097: \ifx\one\xkey\ifx\threex\three \key{#2}%
        !          1098: \else\tclose{\look}\fi
        !          1099: \else\tclose{\look}\fi}
        !          1100: 
        !          1101: % Typeset a dimension, e.g., `in' or `pt'.  The only reason for the
        !          1102: % argument is to make the input look right: @dmn{pt} instead of
        !          1103: % @dmn{}pt.
        !          1104: %
        !          1105: \def\dmn#1{\thinspace #1}
        !          1106: 
        !          1107: \def\kbd#1{\def\look{#1}\expandafter\kbdfoo\look??\par}
        !          1108: 
        !          1109: \def\l#1{{\li #1}\null}                %
        !          1110: 
        !          1111: \def\r#1{{\rm #1}}             % roman font
        !          1112: % Use of \lowercase was suggested.
        !          1113: \def\sc#1{{\smallcaps#1}}      % smallcaps font
        !          1114: \def\ii#1{{\it #1}}            % italic font
        !          1115: 
        !          1116: \message{page headings,}
        !          1117: 
        !          1118: \newskip\titlepagetopglue \titlepagetopglue = 1.5in
        !          1119: \newskip\titlepagebottomglue \titlepagebottomglue = 2pc
        !          1120: 
        !          1121: % First the title page.  Must do @settitle before @titlepage.
        !          1122: \def\titlefont#1{{\titlerm #1}}
        !          1123: 
        !          1124: \newif\ifseenauthor
        !          1125: \newif\iffinishedtitlepage
        !          1126: 
        !          1127: \def\shorttitlepage{\parsearg\shorttitlepagezzz}
        !          1128: \def\shorttitlepagezzz #1{\begingroup\hbox{}\vskip 1.5in \chaprm \centerline{#1}%
        !          1129:        \endgroup\page\hbox{}\page}
        !          1130: 
        !          1131: \def\titlepage{\begingroup \parindent=0pt \textfonts
        !          1132:    \let\subtitlerm=\tenrm
        !          1133: % I deinstalled the following change because \cmr12 is undefined.
        !          1134: % This change was not in the ChangeLog anyway.  --rms.
        !          1135: %   \let\subtitlerm=\cmr12
        !          1136:    \def\subtitlefont{\subtitlerm \normalbaselineskip = 13pt \normalbaselines}%
        !          1137:    %
        !          1138:    \def\authorfont{\authorrm \normalbaselineskip = 16pt \normalbaselines}%
        !          1139:    %
        !          1140:    % Leave some space at the very top of the page.
        !          1141:    \vglue\titlepagetopglue
        !          1142:    %
        !          1143:    % Now you can print the title using @title.
        !          1144:    \def\title{\parsearg\titlezzz}%
        !          1145:    \def\titlezzz##1{\leftline{\titlefont{##1}}
        !          1146:                    % print a rule at the page bottom also.
        !          1147:                    \finishedtitlepagefalse
        !          1148:                    \vskip4pt \hrule height 4pt width \hsize \vskip4pt}%
        !          1149:    % No rule at page bottom unless we print one at the top with @title.
        !          1150:    \finishedtitlepagetrue
        !          1151:    %
        !          1152:    % Now you can put text using @subtitle.
        !          1153:    \def\subtitle{\parsearg\subtitlezzz}%
        !          1154:    \def\subtitlezzz##1{{\subtitlefont \rightline{##1}}}%
        !          1155:    %
        !          1156:    % @author should come last, but may come many times.
        !          1157:    \def\author{\parsearg\authorzzz}%
        !          1158:    \def\authorzzz##1{\ifseenauthor\else\vskip 0pt plus 1filll\seenauthortrue\fi
        !          1159:       {\authorfont \leftline{##1}}}%
        !          1160:    %
        !          1161:    % Most title ``pages'' are actually two pages long, with space
        !          1162:    % at the top of the second.  We don't want the ragged left on the second.
        !          1163:    \let\oldpage = \page
        !          1164:    \def\page{%
        !          1165:       \iffinishedtitlepage\else
        !          1166:         \finishtitlepage
        !          1167:       \fi
        !          1168:       \oldpage
        !          1169:       \let\page = \oldpage
        !          1170:       \hbox{}}%
        !          1171: %   \def\page{\oldpage \hbox{}}
        !          1172: }
        !          1173: 
        !          1174: \def\Etitlepage{%
        !          1175:    \iffinishedtitlepage\else
        !          1176:       \finishtitlepage
        !          1177:    \fi
        !          1178:    % It is important to do the page break before ending the group,
        !          1179:    % because the headline and footline are only empty inside the group.
        !          1180:    % If we use the new definition of \page, we always get a blank page
        !          1181:    % after the title page, which we certainly don't want.
        !          1182:    \oldpage
        !          1183:    \endgroup
        !          1184:    \HEADINGSon
        !          1185: }
        !          1186: 
        !          1187: \def\finishtitlepage{%
        !          1188:    \vskip4pt \hrule height 2pt width \hsize
        !          1189:    \vskip\titlepagebottomglue
        !          1190:    \finishedtitlepagetrue
        !          1191: }
        !          1192: 
        !          1193: %%% Set up page headings and footings.
        !          1194: 
        !          1195: \let\thispage=\folio
        !          1196: 
        !          1197: \newtoks \evenheadline    % Token sequence for heading line of even pages
        !          1198: \newtoks \oddheadline     % Token sequence for heading line of odd pages
        !          1199: \newtoks \evenfootline    % Token sequence for footing line of even pages
        !          1200: \newtoks \oddfootline     % Token sequence for footing line of odd pages
        !          1201: 
        !          1202: % Now make Tex use those variables
        !          1203: \headline={{\textfonts\rm \ifodd\pageno \the\oddheadline
        !          1204:                             \else \the\evenheadline \fi}}
        !          1205: \footline={{\textfonts\rm \ifodd\pageno \the\oddfootline
        !          1206:                             \else \the\evenfootline \fi}\HEADINGShook}
        !          1207: \let\HEADINGShook=\relax
        !          1208: 
        !          1209: % Commands to set those variables.
        !          1210: % For example, this is what  @headings on  does
        !          1211: % @evenheading @thistitle|@thispage|@thischapter
        !          1212: % @oddheading @thischapter|@thispage|@thistitle
        !          1213: % @evenfooting @thisfile||
        !          1214: % @oddfooting ||@thisfile
        !          1215: 
        !          1216: \def\evenheading{\parsearg\evenheadingxxx}
        !          1217: \def\oddheading{\parsearg\oddheadingxxx}
        !          1218: \def\everyheading{\parsearg\everyheadingxxx}
        !          1219: 
        !          1220: \def\evenfooting{\parsearg\evenfootingxxx}
        !          1221: \def\oddfooting{\parsearg\oddfootingxxx}
        !          1222: \def\everyfooting{\parsearg\everyfootingxxx}
        !          1223: 
        !          1224: {\catcode`\@=0 %
        !          1225: 
        !          1226: \gdef\evenheadingxxx #1{\evenheadingyyy #1@|@|@|@|\finish}
        !          1227: \gdef\evenheadingyyy #1@|#2@|#3@|#4\finish{%
        !          1228: \global\evenheadline={\rlap{\centerline{#2}}\line{#1\hfil#3}}}
        !          1229: 
        !          1230: \gdef\oddheadingxxx #1{\oddheadingyyy #1@|@|@|@|\finish}
        !          1231: \gdef\oddheadingyyy #1@|#2@|#3@|#4\finish{%
        !          1232: \global\oddheadline={\rlap{\centerline{#2}}\line{#1\hfil#3}}}
        !          1233: 
        !          1234: \gdef\everyheadingxxx #1{\everyheadingyyy #1@|@|@|@|\finish}
        !          1235: \gdef\everyheadingyyy #1@|#2@|#3@|#4\finish{%
        !          1236: \global\evenheadline={\rlap{\centerline{#2}}\line{#1\hfil#3}}
        !          1237: \global\oddheadline={\rlap{\centerline{#2}}\line{#1\hfil#3}}}
        !          1238: 
        !          1239: \gdef\evenfootingxxx #1{\evenfootingyyy #1@|@|@|@|\finish}
        !          1240: \gdef\evenfootingyyy #1@|#2@|#3@|#4\finish{%
        !          1241: \global\evenfootline={\rlap{\centerline{#2}}\line{#1\hfil#3}}}
        !          1242: 
        !          1243: \gdef\oddfootingxxx #1{\oddfootingyyy #1@|@|@|@|\finish}
        !          1244: \gdef\oddfootingyyy #1@|#2@|#3@|#4\finish{%
        !          1245: \global\oddfootline={\rlap{\centerline{#2}}\line{#1\hfil#3}}}
        !          1246: 
        !          1247: \gdef\everyfootingxxx #1{\everyfootingyyy #1@|@|@|@|\finish}
        !          1248: \gdef\everyfootingyyy #1@|#2@|#3@|#4\finish{%
        !          1249: \global\evenfootline={\rlap{\centerline{#2}}\line{#1\hfil#3}}
        !          1250: \global\oddfootline={\rlap{\centerline{#2}}\line{#1\hfil#3}}}
        !          1251: %
        !          1252: }% unbind the catcode of @.
        !          1253: 
        !          1254: % @headings double     turns headings on for double-sided printing.
        !          1255: % @headings single     turns headings on for single-sided printing.
        !          1256: % @headings off                turns them off.
        !          1257: % @headings on         same as @headings double, retained for compatibility.
        !          1258: % @headings after      turns on double-sided headings after this page.
        !          1259: % @headings doubleafter        turns on double-sided headings after this page.
        !          1260: % @headings singleafter turns on single-sided headings after this page.
        !          1261: % By default, they are off.
        !          1262: 
        !          1263: \def\headings #1 {\csname HEADINGS#1\endcsname}
        !          1264: 
        !          1265: \def\HEADINGSoff{
        !          1266: \global\evenheadline={\hfil} \global\evenfootline={\hfil}
        !          1267: \global\oddheadline={\hfil} \global\oddfootline={\hfil}}
        !          1268: \HEADINGSoff
        !          1269: % When we turn headings on, set the page number to 1.
        !          1270: % For double-sided printing, put current file name in lower left corner,
        !          1271: % chapter name on inside top of right hand pages, document
        !          1272: % title on inside top of left hand pages, and page numbers on outside top
        !          1273: % edge of all pages.
        !          1274: \def\HEADINGSdouble{
        !          1275: %\pagealignmacro
        !          1276: \global\pageno=1
        !          1277: \global\evenfootline={\hfil}
        !          1278: \global\oddfootline={\hfil}
        !          1279: \global\evenheadline={\line{\folio\hfil\thistitle}}
        !          1280: \global\oddheadline={\line{\thischapter\hfil\folio}}
        !          1281: }
        !          1282: % For single-sided printing, chapter title goes across top left of page,
        !          1283: % page number on top right.
        !          1284: \def\HEADINGSsingle{
        !          1285: %\pagealignmacro
        !          1286: \global\pageno=1
        !          1287: \global\evenfootline={\hfil}
        !          1288: \global\oddfootline={\hfil}
        !          1289: \global\evenheadline={\line{\thischapter\hfil\folio}}
        !          1290: \global\oddheadline={\line{\thischapter\hfil\folio}}
        !          1291: }
        !          1292: \def\HEADINGSon{\HEADINGSdouble}
        !          1293: 
        !          1294: \def\HEADINGSafter{\let\HEADINGShook=\HEADINGSdoublex}
        !          1295: \let\HEADINGSdoubleafter=\HEADINGSafter
        !          1296: \def\HEADINGSdoublex{%
        !          1297: \global\evenfootline={\hfil}
        !          1298: \global\oddfootline={\hfil}
        !          1299: \global\evenheadline={\line{\folio\hfil\thistitle}}
        !          1300: \global\oddheadline={\line{\thischapter\hfil\folio}}
        !          1301: }
        !          1302: 
        !          1303: \def\HEADINGSsingleafter{\let\HEADINGShook=\HEADINGSsinglex}
        !          1304: \def\HEADINGSsinglex{%
        !          1305: \global\evenfootline={\hfil}
        !          1306: \global\oddfootline={\hfil}
        !          1307: \global\evenheadline={\line{\thischapter\hfil\folio}}
        !          1308: \global\oddheadline={\line{\thischapter\hfil\folio}}
        !          1309: }
        !          1310: 
        !          1311: % Subroutines used in generating headings
        !          1312: % Produces Day Month Year style of output.
        !          1313: \def\today{\number\day\space
        !          1314: \ifcase\month\or
        !          1315: January\or February\or March\or April\or May\or June\or
        !          1316: July\or August\or September\or October\or November\or December\fi
        !          1317: \space\number\year}
        !          1318: 
        !          1319: % Use this if you want the Month Day, Year style of output.
        !          1320: %\def\today{\ifcase\month\or
        !          1321: %January\or February\or March\or April\or May\or June\or
        !          1322: %July\or August\or September\or October\or November\or December\fi
        !          1323: %\space\number\day, \number\year}
        !          1324: 
        !          1325: % @settitle line...  specifies the title of the document, for headings
        !          1326: % It generates no output of its own
        !          1327: 
        !          1328: \def\thistitle{No Title}
        !          1329: \def\settitle{\parsearg\settitlezzz}
        !          1330: \def\settitlezzz #1{\gdef\thistitle{#1}}
        !          1331: 
        !          1332: \message{tables,}
        !          1333: 
        !          1334: % @tabs -- simple alignment
        !          1335: 
        !          1336: % These don't work.  For one thing, \+ is defined as outer.
        !          1337: % So these macros cannot even be defined.
        !          1338: 
        !          1339: %\def\tabs{\parsearg\tabszzz}
        !          1340: %\def\tabszzz #1{\settabs\+#1\cr}
        !          1341: %\def\tabline{\parsearg\tablinezzz}
        !          1342: %\def\tablinezzz #1{\+#1\cr}
        !          1343: %\def\&{&}
        !          1344: 
        !          1345: % Tables -- @table, @ftable, @vtable, @item(x), @kitem(x), @xitem(x).
        !          1346: 
        !          1347: % default indentation of table text
        !          1348: \newdimen\tableindent \tableindent=.8in
        !          1349: % default indentation of @itemize and @enumerate text
        !          1350: \newdimen\itemindent  \itemindent=.3in
        !          1351: % margin between end of table item and start of table text.
        !          1352: \newdimen\itemmargin  \itemmargin=.1in
        !          1353: 
        !          1354: % used internally for \itemindent minus \itemmargin
        !          1355: \newdimen\itemmax
        !          1356: 
        !          1357: % Note @table, @vtable, and @vtable define @item, @itemx, etc., with
        !          1358: % these defs.
        !          1359: % They also define \itemindex
        !          1360: % to index the item name in whatever manner is desired (perhaps none).
        !          1361: 
        !          1362: \newif\ifitemxneedsnegativevskip
        !          1363: 
        !          1364: \def\itemxpar{\par\ifitemxneedsnegativevskip\vskip-\parskip\nobreak\fi}
        !          1365: 
        !          1366: \def\internalBitem{\smallbreak \parsearg\itemzzz}
        !          1367: \def\internalBitemx{\itemxpar \parsearg\itemzzz}
        !          1368: 
        !          1369: \def\internalBxitem "#1"{\def\xitemsubtopix{#1} \smallbreak \parsearg\xitemzzz}
        !          1370: \def\internalBxitemx "#1"{\def\xitemsubtopix{#1} \itemxpar \parsearg\xitemzzz}
        !          1371: 
        !          1372: \def\internalBkitem{\smallbreak \parsearg\kitemzzz}
        !          1373: \def\internalBkitemx{\itemxpar \parsearg\kitemzzz}
        !          1374: 
        !          1375: \def\kitemzzz #1{\dosubind {kw}{\code{#1}}{for {\bf \lastfunction}}%
        !          1376:                  \itemzzz {#1}}
        !          1377: 
        !          1378: \def\xitemzzz #1{\dosubind {kw}{\code{#1}}{for {\bf \xitemsubtopic}}%
        !          1379:                  \itemzzz {#1}}
        !          1380: 
        !          1381: \def\itemzzz #1{\begingroup %
        !          1382:   \advance\hsize by -\rightskip
        !          1383:   \advance\hsize by -\tableindent
        !          1384:   \setbox0=\hbox{\itemfont{#1}}%
        !          1385:   \itemindex{#1}%
        !          1386:   \nobreak % This prevents a break before @itemx.
        !          1387:   %
        !          1388:   % Be sure we are not still in the middle of a paragraph.
        !          1389:   %{\parskip = 0in
        !          1390:   %\par
        !          1391:   %}%
        !          1392:   %
        !          1393:   % If the item text does not fit in the space we have, put it on a line
        !          1394:   % by itself, and do not allow a page break either before or after that
        !          1395:   % line.  We do not start a paragraph here because then if the next
        !          1396:   % command is, e.g., @kindex, the whatsit would get put into the
        !          1397:   % horizontal list on a line by itself, resulting in extra blank space.
        !          1398:   \ifdim \wd0>\itemmax
        !          1399:     %
        !          1400:     % Make this a paragraph so we get the \parskip glue and wrapping,
        !          1401:     % but leave it ragged-right.
        !          1402:     \begingroup
        !          1403:       \advance\leftskip by-\tableindent
        !          1404:       \advance\hsize by\tableindent
        !          1405:       \advance\rightskip by0pt plus1fil
        !          1406:       \leavevmode\unhbox0\par
        !          1407:     \endgroup
        !          1408:     %
        !          1409:     % We're going to be starting a paragraph, but we don't want the
        !          1410:     % \parskip glue -- logically it's part of the @item we just started.
        !          1411:     \nobreak \vskip-\parskip
        !          1412:     %
        !          1413:     % Stop a page break at the \parskip glue coming up.  Unfortunately
        !          1414:     % we can't prevent a possible page break at the following
        !          1415:     % \baselineskip glue.
        !          1416:     \nobreak
        !          1417:     \endgroup
        !          1418:     \itemxneedsnegativevskipfalse
        !          1419:   \else
        !          1420:     % The item text fits into the space.  Start a paragraph, so that the
        !          1421:     % following text (if any) will end up on the same line.  Since that
        !          1422:     % text will be indented by \tableindent, we make the item text be in
        !          1423:     % a zero-width box.
        !          1424:     \noindent
        !          1425:     \rlap{\hskip -\tableindent\box0}\ignorespaces%
        !          1426:     \endgroup%
        !          1427:     \itemxneedsnegativevskiptrue%
        !          1428:   \fi
        !          1429: }
        !          1430: 
        !          1431: \def\item{\errmessage{@item while not in a table}}
        !          1432: \def\itemx{\errmessage{@itemx while not in a table}}
        !          1433: \def\kitem{\errmessage{@kitem while not in a table}}
        !          1434: \def\kitemx{\errmessage{@kitemx while not in a table}}
        !          1435: \def\xitem{\errmessage{@xitem while not in a table}}
        !          1436: \def\xitemx{\errmessage{@xitemx while not in a table}}
        !          1437: 
        !          1438: %% Contains a kludge to get @end[description] to work
        !          1439: \def\description{\tablez{\dontindex}{1}{}{}{}{}}
        !          1440: 
        !          1441: \def\table{\begingroup\inENV\obeylines\obeyspaces\tablex}
        !          1442: {\obeylines\obeyspaces%
        !          1443: \gdef\tablex #1^^M{%
        !          1444: \tabley\dontindex#1        \endtabley}}
        !          1445: 
        !          1446: \def\ftable{\begingroup\inENV\obeylines\obeyspaces\ftablex}
        !          1447: {\obeylines\obeyspaces%
        !          1448: \gdef\ftablex #1^^M{%
        !          1449: \tabley\fnitemindex#1        \endtabley
        !          1450: \def\Eftable{\endgraf\afterenvbreak\endgroup}%
        !          1451: \let\Etable=\relax}}
        !          1452: 
        !          1453: \def\vtable{\begingroup\inENV\obeylines\obeyspaces\vtablex}
        !          1454: {\obeylines\obeyspaces%
        !          1455: \gdef\vtablex #1^^M{%
        !          1456: \tabley\vritemindex#1        \endtabley
        !          1457: \def\Evtable{\endgraf\afterenvbreak\endgroup}%
        !          1458: \let\Etable=\relax}}
        !          1459: 
        !          1460: \def\dontindex #1{}
        !          1461: \def\fnitemindex #1{\doind {fn}{\code{#1}}}%
        !          1462: \def\vritemindex #1{\doind {vr}{\code{#1}}}%
        !          1463: 
        !          1464: {\obeyspaces %
        !          1465: \gdef\tabley#1#2 #3 #4 #5 #6 #7\endtabley{\endgroup%
        !          1466: \tablez{#1}{#2}{#3}{#4}{#5}{#6}}}
        !          1467: 
        !          1468: \def\tablez #1#2#3#4#5#6{%
        !          1469: \aboveenvbreak %
        !          1470: \begingroup %
        !          1471: \def\Edescription{\Etable}% Neccessary kludge.
        !          1472: \let\itemindex=#1%
        !          1473: \ifnum 0#3>0 \advance \leftskip by #3\mil \fi %
        !          1474: \ifnum 0#4>0 \tableindent=#4\mil \fi %
        !          1475: \ifnum 0#5>0 \advance \rightskip by #5\mil \fi %
        !          1476: \def\itemfont{#2}%
        !          1477: \itemmax=\tableindent %
        !          1478: \advance \itemmax by -\itemmargin %
        !          1479: \advance \leftskip by \tableindent %
        !          1480: \exdentamount=\tableindent
        !          1481: \parindent = 0pt
        !          1482: \parskip = \smallskipamount
        !          1483: \ifdim \parskip=0pt \parskip=2pt \fi%
        !          1484: \def\Etable{\endgraf\afterenvbreak\endgroup}%
        !          1485: \let\item = \internalBitem %
        !          1486: \let\itemx = \internalBitemx %
        !          1487: \let\kitem = \internalBkitem %
        !          1488: \let\kitemx = \internalBkitemx %
        !          1489: \let\xitem = \internalBxitem %
        !          1490: \let\xitemx = \internalBxitemx %
        !          1491: }
        !          1492: 
        !          1493: % This is the counter used by @enumerate, which is really @itemize
        !          1494: 
        !          1495: \newcount \itemno
        !          1496: 
        !          1497: \def\itemize{\parsearg\itemizezzz}
        !          1498: 
        !          1499: \def\itemizezzz #1{%
        !          1500:   \begingroup % ended by the @end itemsize
        !          1501:   \itemizey {#1}{\Eitemize}
        !          1502: }
        !          1503: 
        !          1504: \def\itemizey #1#2{%
        !          1505: \aboveenvbreak %
        !          1506: \itemmax=\itemindent %
        !          1507: \advance \itemmax by -\itemmargin %
        !          1508: \advance \leftskip by \itemindent %
        !          1509: \exdentamount=\itemindent
        !          1510: \parindent = 0pt %
        !          1511: \parskip = \smallskipamount %
        !          1512: \ifdim \parskip=0pt \parskip=2pt \fi%
        !          1513: \def#2{\endgraf\afterenvbreak\endgroup}%
        !          1514: \def\itemcontents{#1}%
        !          1515: \let\item=\itemizeitem}
        !          1516: 
        !          1517: % Set sfcode to normal for the chars that usually have another value.
        !          1518: % These are `.?!:;,'
        !          1519: \def\frenchspacing{\sfcode46=1000 \sfcode63=1000 \sfcode33=1000
        !          1520:   \sfcode58=1000 \sfcode59=1000 \sfcode44=1000 }
        !          1521: 
        !          1522: % \splitoff TOKENS\endmark defines \first to be the first token in
        !          1523: % TOKENS, and \rest to be the remainder.
        !          1524: %
        !          1525: \def\splitoff#1#2\endmark{\def\first{#1}\def\rest{#2}}%
        !          1526: 
        !          1527: % Allow an optional argument of an uppercase letter, lowercase letter,
        !          1528: % or number, to specify the first label in the enumerated list.  No
        !          1529: % argument is the same as `1'.
        !          1530: %
        !          1531: \def\enumerate{\parsearg\enumeratezzz}
        !          1532: \def\enumeratezzz #1{\enumeratey #1  \endenumeratey}
        !          1533: \def\enumeratey #1 #2\endenumeratey{%
        !          1534:   \begingroup % ended by the @end enumerate
        !          1535:   %
        !          1536:   % If we were given no argument, pretend we were given `1'.
        !          1537:   \def\thearg{#1}%
        !          1538:   \ifx\thearg\empty \def\thearg{1}\fi
        !          1539:   %
        !          1540:   % Detect if the argument is a single token.  If so, it might be a
        !          1541:   % letter.  Otherwise, the only valid thing it can be is a number.
        !          1542:   % (We will always have one token, because of the test we just made.
        !          1543:   % This is a good thing, since \splitoff doesn't work given nothing at
        !          1544:   % all -- the first parameter is undelimited.)
        !          1545:   \expandafter\splitoff\thearg\endmark
        !          1546:   \ifx\rest\empty
        !          1547:     % Only one token in the argument.  It could still be anything.
        !          1548:     % A ``lowercase letter'' is one whose \lccode is nonzero.
        !          1549:     % An ``uppercase letter'' is one whose \lccode is both nonzero, and
        !          1550:     %   not equal to itself.
        !          1551:     % Otherwise, we assume it's a number.
        !          1552:     %
        !          1553:     % We need the \relax at the end of the \ifnum lines to stop TeX from
        !          1554:     % continuing to look for a <number>.
        !          1555:     %
        !          1556:     \ifnum\lccode\expandafter`\thearg=0\relax
        !          1557:       \numericenumerate % a number (we hope)
        !          1558:     \else
        !          1559:       % It's a letter.
        !          1560:       \ifnum\lccode\expandafter`\thearg=\expandafter`\thearg\relax
        !          1561:         \lowercaseenumerate % lowercase letter
        !          1562:       \else
        !          1563:         \uppercaseenumerate % uppercase letter
        !          1564:       \fi
        !          1565:     \fi
        !          1566:   \else
        !          1567:     % Multiple tokens in the argument.  We hope it's a number.
        !          1568:     \numericenumerate
        !          1569:   \fi
        !          1570: }
        !          1571: 
        !          1572: % An @enumerate whose labels are integers.  The starting integer is
        !          1573: % given in \thearg.
        !          1574: %
        !          1575: \def\numericenumerate{%
        !          1576:   \itemno = \thearg
        !          1577:   \startenumeration{\the\itemno}%
        !          1578: }
        !          1579: 
        !          1580: % The starting (lowercase) letter is in \thearg.
        !          1581: \def\lowercaseenumerate{%
        !          1582:   \itemno = \expandafter`\thearg
        !          1583:   \startenumeration{%
        !          1584:     % Be sure we're not beyond the end of the alphabet.
        !          1585:     \ifnum\itemno=0
        !          1586:       \errmessage{No more lowercase letters in @enumerate; get a bigger
        !          1587:                   alphabet}%
        !          1588:     \fi
        !          1589:     \char\lccode\itemno
        !          1590:   }%
        !          1591: }
        !          1592: 
        !          1593: % The starting (uppercase) letter is in \thearg.
        !          1594: \def\uppercaseenumerate{%
        !          1595:   \itemno = \expandafter`\thearg
        !          1596:   \startenumeration{%
        !          1597:     % Be sure we're not beyond the end of the alphabet.
        !          1598:     \ifnum\itemno=0
        !          1599:       \errmessage{No more uppercase letters in @enumerate; get a bigger
        !          1600:                   alphabet}
        !          1601:     \fi
        !          1602:     \char\uccode\itemno
        !          1603:   }%
        !          1604: }
        !          1605: 
        !          1606: % Call itemizey, adding a period to the first argument and supplying the
        !          1607: % common last two arguments.  Also subtract one from the initial value in
        !          1608: % \itemno, since @item increments \itemno.
        !          1609: %
        !          1610: \def\startenumeration#1{%
        !          1611:   \advance\itemno by -1
        !          1612:   \itemizey{#1.}\Eenumerate\flushcr
        !          1613: }
        !          1614: 
        !          1615: % @alphaenumerate and @capsenumerate are abbreviations for giving an arg
        !          1616: % to @enumerate.
        !          1617: %
        !          1618: \def\alphaenumerate{\enumerate{a}}
        !          1619: \def\capsenumerate{\enumerate{A}}
        !          1620: \def\Ealphaenumerate{\Eenumerate}
        !          1621: \def\Ecapsenumerate{\Eenumerate}
        !          1622: 
        !          1623: % Definition of @item while inside @itemize.
        !          1624: 
        !          1625: \def\itemizeitem{%
        !          1626: \advance\itemno by 1
        !          1627: {\let\par=\endgraf \smallbreak}%
        !          1628: \ifhmode \errmessage{\in hmode at itemizeitem}\fi
        !          1629: {\parskip=0in \hskip 0pt
        !          1630: \hbox to 0pt{\hss \itemcontents\hskip \itemmargin}%
        !          1631: \vadjust{\penalty 1200}}%
        !          1632: \flushcr}
        !          1633: 
        !          1634: \message{indexing,}
        !          1635: % Index generation facilities
        !          1636: 
        !          1637: % Define \newwrite to be identical to plain tex's \newwrite
        !          1638: % except not \outer, so it can be used within \newindex.
        !          1639: {\catcode`\@=11
        !          1640: \gdef\newwrite{\alloc@7\write\chardef\sixt@@n}}
        !          1641: 
        !          1642: % \newindex {foo} defines an index named foo.
        !          1643: % It automatically defines \fooindex such that
        !          1644: % \fooindex ...rest of line... puts an entry in the index foo.
        !          1645: % It also defines \fooindfile to be the number of the output channel for
        !          1646: % the file that        accumulates this index.  The file's extension is foo.
        !          1647: % The name of an index should be no more than 2 characters long
        !          1648: % for the sake of vms.
        !          1649: 
        !          1650: \def\newindex #1{
        !          1651: \expandafter\newwrite \csname#1indfile\endcsname% Define number for output file
        !          1652: \openout \csname#1indfile\endcsname \jobname.#1        % Open the file
        !          1653: \expandafter\xdef\csname#1index\endcsname{%    % Define \xxxindex
        !          1654: \noexpand\doindex {#1}}
        !          1655: }
        !          1656: 
        !          1657: % @defindex foo  ==  \newindex{foo}
        !          1658: 
        !          1659: \def\defindex{\parsearg\newindex}
        !          1660: 
        !          1661: % Define @defcodeindex, like @defindex except put all entries in @code.
        !          1662: 
        !          1663: \def\newcodeindex #1{
        !          1664: \expandafter\newwrite \csname#1indfile\endcsname% Define number for output file
        !          1665: \openout \csname#1indfile\endcsname \jobname.#1        % Open the file
        !          1666: \expandafter\xdef\csname#1index\endcsname{%    % Define \xxxindex
        !          1667: \noexpand\docodeindex {#1}}
        !          1668: }
        !          1669: 
        !          1670: \def\defcodeindex{\parsearg\newcodeindex}
        !          1671: 
        !          1672: % @synindex foo bar    makes index foo feed into index bar.
        !          1673: % Do this instead of @defindex foo if you don't want it as a separate index.
        !          1674: \def\synindex #1 #2 {%
        !          1675: \expandafter\let\expandafter\synindexfoo\expandafter=\csname#2indfile\endcsname
        !          1676: \expandafter\let\csname#1indfile\endcsname=\synindexfoo
        !          1677: \expandafter\xdef\csname#1index\endcsname{%    % Define \xxxindex
        !          1678: \noexpand\doindex {#2}}%
        !          1679: }
        !          1680: 
        !          1681: % @syncodeindex foo bar   similar, but put all entries made for index foo
        !          1682: % inside @code.
        !          1683: \def\syncodeindex #1 #2 {%
        !          1684: \expandafter\let\expandafter\synindexfoo\expandafter=\csname#2indfile\endcsname
        !          1685: \expandafter\let\csname#1indfile\endcsname=\synindexfoo
        !          1686: \expandafter\xdef\csname#1index\endcsname{%    % Define \xxxindex
        !          1687: \noexpand\docodeindex {#2}}%
        !          1688: }
        !          1689: 
        !          1690: % Define \doindex, the driver for all \fooindex macros.
        !          1691: % Argument #1 is generated by the calling \fooindex macro,
        !          1692: %  and it is "foo", the name of the index.
        !          1693: 
        !          1694: % \doindex just uses \parsearg; it calls \doind for the actual work.
        !          1695: % This is because \doind is more useful to call from other macros.
        !          1696: 
        !          1697: % There is also \dosubind {index}{topic}{subtopic}
        !          1698: % which makes an entry in a two-level index such as the operation index.
        !          1699: 
        !          1700: \def\doindex#1{\edef\indexname{#1}\parsearg\singleindexer}
        !          1701: \def\singleindexer #1{\doind{\indexname}{#1}}
        !          1702: 
        !          1703: % like the previous two, but they put @code around the argument.
        !          1704: \def\docodeindex#1{\edef\indexname{#1}\parsearg\singlecodeindexer}
        !          1705: \def\singlecodeindexer #1{\doind{\indexname}{\code{#1}}}
        !          1706: 
        !          1707: \def\indexdummies{%
        !          1708: \def\_{{\realbackslash _}}%
        !          1709: \def\w{\realbackslash w }%
        !          1710: \def\bf{\realbackslash bf }%
        !          1711: \def\rm{\realbackslash rm }%
        !          1712: \def\sl{\realbackslash sl }%
        !          1713: \def\sf{\realbackslash sf}%
        !          1714: \def\tt{\realbackslash tt}%
        !          1715: \def\gtr{\realbackslash gtr}%
        !          1716: \def\less{\realbackslash less}%
        !          1717: \def\hat{\realbackslash hat}%
        !          1718: \def\char{\realbackslash char}%
        !          1719: \def\TeX{\realbackslash TeX}%
        !          1720: \def\dots{\realbackslash dots }%
        !          1721: \def\copyright{\realbackslash copyright }%
        !          1722: \def\tclose##1{\realbackslash tclose {##1}}%
        !          1723: \def\code##1{\realbackslash code {##1}}%
        !          1724: \def\samp##1{\realbackslash samp {##1}}%
        !          1725: \def\t##1{\realbackslash r {##1}}%
        !          1726: \def\r##1{\realbackslash r {##1}}%
        !          1727: \def\i##1{\realbackslash i {##1}}%
        !          1728: \def\b##1{\realbackslash b {##1}}%
        !          1729: \def\cite##1{\realbackslash cite {##1}}%
        !          1730: \def\key##1{\realbackslash key {##1}}%
        !          1731: \def\file##1{\realbackslash file {##1}}%
        !          1732: \def\var##1{\realbackslash var {##1}}%
        !          1733: \def\kbd##1{\realbackslash kbd {##1}}%
        !          1734: \def\dfn##1{\realbackslash dfn {##1}}%
        !          1735: \def\emph##1{\realbackslash emph {##1}}%
        !          1736: }
        !          1737: 
        !          1738: % \indexnofonts no-ops all font-change commands.
        !          1739: % This is used when outputting the strings to sort the index by.
        !          1740: \def\indexdummyfont#1{#1}
        !          1741: \def\indexdummytex{TeX}
        !          1742: \def\indexdummydots{...}
        !          1743: 
        !          1744: \def\indexnofonts{%
        !          1745: \let\w=\indexdummyfont
        !          1746: \let\t=\indexdummyfont
        !          1747: \let\r=\indexdummyfont
        !          1748: \let\i=\indexdummyfont
        !          1749: \let\b=\indexdummyfont
        !          1750: \let\emph=\indexdummyfont
        !          1751: \let\strong=\indexdummyfont
        !          1752: \let\cite=\indexdummyfont
        !          1753: \let\sc=\indexdummyfont
        !          1754: %Don't no-op \tt, since it isn't a user-level command
        !          1755: % and is used in the definitions of the active chars like <, >, |...
        !          1756: %\let\tt=\indexdummyfont
        !          1757: \let\tclose=\indexdummyfont
        !          1758: \let\code=\indexdummyfont
        !          1759: \let\file=\indexdummyfont
        !          1760: \let\samp=\indexdummyfont
        !          1761: \let\kbd=\indexdummyfont
        !          1762: \let\key=\indexdummyfont
        !          1763: \let\var=\indexdummyfont
        !          1764: \let\TeX=\indexdummytex
        !          1765: \let\dots=\indexdummydots
        !          1766: }
        !          1767: 
        !          1768: % To define \realbackslash, we must make \ not be an escape.
        !          1769: % We must first make another character (@) an escape
        !          1770: % so we do not become unable to do a definition.
        !          1771: 
        !          1772: {\catcode`\@=0 \catcode`\\=\other
        !          1773: @gdef@realbackslash{\}}
        !          1774: 
        !          1775: \let\indexbackslash=0  %overridden during \printindex.
        !          1776: 
        !          1777: \def\doind #1#2{%
        !          1778: {\count10=\lastpenalty %
        !          1779: {\indexdummies % Must do this here, since \bf, etc expand at this stage
        !          1780: \escapechar=`\\%
        !          1781: {\let\folio=0% Expand all macros now EXCEPT \folio
        !          1782: \def\rawbackslashxx{\indexbackslash}% \indexbackslash isn't defined now
        !          1783: % so it will be output as is; and it will print as backslash in the indx.
        !          1784: %
        !          1785: % Now process the index-string once, with all font commands turned off,
        !          1786: % to get the string to sort the index by.
        !          1787: {\indexnofonts
        !          1788: \xdef\temp1{#2}%
        !          1789: }%
        !          1790: % Now produce the complete index entry.  We process the index-string again,
        !          1791: % this time with font commands expanded, to get what to print in the index.
        !          1792: \edef\temp{%
        !          1793: \write \csname#1indfile\endcsname{%
        !          1794: \realbackslash entry {\temp1}{\folio}{#2}}}%
        !          1795: \temp }%
        !          1796: }\penalty\count10}}
        !          1797: 
        !          1798: \def\dosubind #1#2#3{%
        !          1799: {\count10=\lastpenalty %
        !          1800: {\indexdummies % Must do this here, since \bf, etc expand at this stage
        !          1801: \escapechar=`\\%
        !          1802: {\let\folio=0%
        !          1803: \def\rawbackslashxx{\indexbackslash}%
        !          1804: %
        !          1805: % Now process the index-string once, with all font commands turned off,
        !          1806: % to get the string to sort the index by.
        !          1807: {\indexnofonts
        !          1808: \xdef\temp1{#2 #3}%
        !          1809: }%
        !          1810: % Now produce the complete index entry.  We process the index-string again,
        !          1811: % this time with font commands expanded, to get what to print in the index.
        !          1812: \edef\temp{%
        !          1813: \write \csname#1indfile\endcsname{%
        !          1814: \realbackslash entry {\temp1}{\folio}{#2}{#3}}}%
        !          1815: \temp }%
        !          1816: }\penalty\count10}}
        !          1817: 
        !          1818: % The index entry written in the file actually looks like
        !          1819: %  \entry {sortstring}{page}{topic}
        !          1820: % or
        !          1821: %  \entry {sortstring}{page}{topic}{subtopic}
        !          1822: % The texindex program reads in these files and writes files
        !          1823: % containing these kinds of lines:
        !          1824: %  \initial {c}
        !          1825: %     before the first topic whose initial is c
        !          1826: %  \entry {topic}{pagelist}
        !          1827: %     for a topic that is used without subtopics
        !          1828: %  \primary {topic}
        !          1829: %     for the beginning of a topic that is used with subtopics
        !          1830: %  \secondary {subtopic}{pagelist}
        !          1831: %     for each subtopic.
        !          1832: 
        !          1833: % Define the user-accessible indexing commands
        !          1834: % @findex, @vindex, @kindex, @cindex.
        !          1835: 
        !          1836: \def\findex {\fnindex}
        !          1837: \def\kindex {\kyindex}
        !          1838: \def\cindex {\cpindex}
        !          1839: \def\vindex {\vrindex}
        !          1840: \def\tindex {\tpindex}
        !          1841: \def\pindex {\pgindex}
        !          1842: 
        !          1843: \def\cindexsub {\begingroup\obeylines\cindexsub}
        !          1844: {\obeylines %
        !          1845: \gdef\cindexsub "#1" #2^^M{\endgroup %
        !          1846: \dosubind{cp}{#2}{#1}}}
        !          1847: 
        !          1848: % Define the macros used in formatting output of the sorted index material.
        !          1849: 
        !          1850: % This is what you call to cause a particular index to get printed.
        !          1851: % Write
        !          1852: % @unnumbered Function Index
        !          1853: % @printindex fn
        !          1854: 
        !          1855: \def\printindex{\parsearg\doprintindex}
        !          1856: 
        !          1857: \def\doprintindex#1{%
        !          1858:   \tex
        !          1859:   \dobreak \chapheadingskip {10000}
        !          1860:   \catcode`\%=\other\catcode`\&=\other\catcode`\#=\other
        !          1861:   \catcode`\$=\other\catcode`\_=\other
        !          1862:   \catcode`\~=\other
        !          1863:   %
        !          1864:   % The following don't help, since the chars were translated
        !          1865:   % when the raw index was written, and their fonts were discarded
        !          1866:   % due to \indexnofonts.
        !          1867:   %\catcode`\"=\active
        !          1868:   %\catcode`\^=\active
        !          1869:   %\catcode`\_=\active
        !          1870:   %\catcode`\|=\active
        !          1871:   %\catcode`\<=\active
        !          1872:   %\catcode`\>=\active
        !          1873:   % %
        !          1874:   \def\indexbackslash{\rawbackslashxx}
        !          1875:   \indexfonts\rm \tolerance=9500 \advance\baselineskip -1pt
        !          1876:   \begindoublecolumns
        !          1877:   %
        !          1878:   % See if the index file exists and is nonempty.
        !          1879:   \openin 1 \jobname.#1s
        !          1880:   \ifeof 1
        !          1881:     % \enddoublecolumns gets confused if there is no text in the index,
        !          1882:     % and it loses the chapter title and the aux file entries for the
        !          1883:     % index.  The easiest way to prevent this problem is to make sure
        !          1884:     % there is some text.
        !          1885:     (Index is nonexistent)
        !          1886:     \else
        !          1887:     %
        !          1888:     % If the index file exists but is empty, then \openin leaves \ifeof
        !          1889:     % false.  We have to make TeX try to read something from the file, so
        !          1890:     % it can discover if there is anything in it.
        !          1891:     \read 1 to \temp
        !          1892:     \ifeof 1
        !          1893:       (Index is empty)
        !          1894:     \else
        !          1895:       \input \jobname.#1s
        !          1896:     \fi
        !          1897:   \fi
        !          1898:   \closein 1
        !          1899:   \enddoublecolumns
        !          1900:   \Etex
        !          1901: }
        !          1902: 
        !          1903: % These macros are used by the sorted index file itself.
        !          1904: % Change them to control the appearance of the index.
        !          1905: 
        !          1906: % Same as \bigskipamount except no shrink.
        !          1907: % \balancecolumns gets confused if there is any shrink.
        !          1908: \newskip\initialskipamount \initialskipamount 12pt plus4pt
        !          1909: 
        !          1910: \def\initial #1{%
        !          1911: {\let\tentt=\sectt \let\tt=\sectt \let\sf=\sectt
        !          1912: \ifdim\lastskip<\initialskipamount
        !          1913: \removelastskip \penalty-200 \vskip \initialskipamount\fi
        !          1914: \line{\secbf#1\hfill}\kern 2pt\penalty10000}}
        !          1915: 
        !          1916: % This typesets a paragraph consisting of #1, dot leaders, and then #2
        !          1917: % flush to the right margin.  It is used for index and table of contents
        !          1918: % entries.  The paragraph is indented by \leftskip.
        !          1919: %
        !          1920: \def\entry #1#2{\begingroup
        !          1921:   %
        !          1922:   % Start a new paragraph if necessary, so our assignments below can't
        !          1923:   % affect previous text.
        !          1924:   \par
        !          1925:   %
        !          1926:   % Do not fill out the last line with white space.
        !          1927:   \parfillskip = 0in
        !          1928:   %
        !          1929:   % No extra space above this paragraph.
        !          1930:   \parskip = 0in
        !          1931:   %
        !          1932:   % Do not prefer a separate line ending with a hyphen to fewer lines.
        !          1933:   \finalhyphendemerits = 0
        !          1934:   %
        !          1935:   % \hangindent is only relevant when the entry text and page number
        !          1936:   % don't both fit on one line.  In that case, bob suggests starting the
        !          1937:   % dots pretty far over on the line.  Unfortunately, a large
        !          1938:   % indentation looks wrong when the entry text itself is broken across
        !          1939:   % lines.  So we use a small indentation and put up with long leaders.
        !          1940:   %
        !          1941:   % \hangafter is reset to 1 (which is the value we want) at the start
        !          1942:   % of each paragraph, so we need not do anything with that.
        !          1943:   \hangindent=2em
        !          1944:   %
        !          1945:   % When the entry text needs to be broken, just fill out the first line
        !          1946:   % with blank space.
        !          1947:   \rightskip = 0pt plus1fil
        !          1948:   %
        !          1949:   % Start a ``paragraph'' for the index entry so the line breaking
        !          1950:   % parameters we've set above will have an effect.
        !          1951:   \noindent
        !          1952:   %
        !          1953:   % Insert the text of the index entry.  TeX will do line-breaking on it.
        !          1954:   #1%
        !          1955:   % If there are no page numbers, don't output a line of dots.
        !          1956:   \def\tempa{#2}
        !          1957:   \def\tempb{}
        !          1958:   \ifx\tempa\tempb\ \else
        !          1959:     %
        !          1960:     % If we must, put the page number on a line of its own, and fill out
        !          1961:     % this line with blank space.  (The \hfil is overwhelmed with the
        !          1962:     % fill leaders glue in \indexdotfill if the page number does fit.)
        !          1963:     \hfil\penalty50
        !          1964:     \null\nobreak\indexdotfill % Have leaders before the page number.
        !          1965:     %
        !          1966:     % The `\ ' here is removed by the implicit \unskip that TeX does as
        !          1967:     % part of (the primitive) \par.  Without it, a spurious underfull
        !          1968:     % \hbox ensues.
        !          1969:     \ #2% The page number ends the paragraph.
        !          1970:   \fi%
        !          1971:   \par
        !          1972: \endgroup}
        !          1973: 
        !          1974: % Like \dotfill except takes at least 1 em.
        !          1975: \def\indexdotfill{\cleaders
        !          1976:   \hbox{$\mathsurround=0pt \mkern1.5mu . \mkern1.5mu$}\hskip 1em plus 1fill}
        !          1977: 
        !          1978: \def\primary #1{\line{#1\hfil}}
        !          1979: 
        !          1980: \newskip\secondaryindent \secondaryindent=0.5cm
        !          1981: 
        !          1982: \def\secondary #1#2{
        !          1983: {\parfillskip=0in \parskip=0in
        !          1984: \hangindent =1in \hangafter=1
        !          1985: \noindent\hskip\secondaryindent\hbox{#1}\indexdotfill #2\par
        !          1986: }}
        !          1987: 
        !          1988: %% Define two-column mode, which is used in indexes.
        !          1989: %% Adapted from the TeXbook, page 416.
        !          1990: \catcode `\@=11
        !          1991: 
        !          1992: \newbox\partialpage
        !          1993: 
        !          1994: \newdimen\doublecolumnhsize
        !          1995: 
        !          1996: \def\begindoublecolumns{\begingroup
        !          1997:   % Grab any single-column material above us.
        !          1998:   \output = {\global\setbox\partialpage
        !          1999:     =\vbox{\unvbox255\kern -\topskip \kern \baselineskip}}%
        !          2000:   \eject
        !          2001:   %
        !          2002:   % Now switch to the double-column output routine.
        !          2003:   \output={\doublecolumnout}%
        !          2004:   %
        !          2005:   % Change the page size parameters.  We could do this once outside this
        !          2006:   % routine, in each of @smallbook, @afourpaper, and the default 8.5x11
        !          2007:   % format, but then we repeat the same computation.  Repeating a couple
        !          2008:   % of assignments once per index is clearly meaningless for the
        !          2009:   % execution time, so we may as well do it once.
        !          2010:   %
        !          2011:   % First we halve the line length, less a little for the gutter between
        !          2012:   % the columns.  We compute the gutter based on the line length, so it
        !          2013:   % changes automatically with the paper format.  The magic constant
        !          2014:   % below is chosen so that the gutter has the same value (well, +- <
        !          2015:   % 1pt) as it did when we hard-coded it.
        !          2016:   %
        !          2017:   % We put the result in a separate register, \doublecolumhsize, so we
        !          2018:   % can restore it in \pagesofar, after \hsize itself has (potentially)
        !          2019:   % been clobbered.
        !          2020:   %
        !          2021:   \doublecolumnhsize = \hsize
        !          2022:     \advance\doublecolumnhsize by -.04154\hsize
        !          2023:     \divide\doublecolumnhsize by 2
        !          2024:   \hsize = \doublecolumnhsize
        !          2025:   %
        !          2026:   % Double the \vsize as well.  (We don't need a separate register here,
        !          2027:   % since nobody clobbers \vsize.)
        !          2028:   \vsize = 2\vsize
        !          2029:   \doublecolumnpagegoal
        !          2030: }
        !          2031: 
        !          2032: \def\enddoublecolumns{\eject \endgroup \pagegoal=\vsize \unvbox\partialpage}
        !          2033: 
        !          2034: \def\doublecolumnsplit{\splittopskip=\topskip \splitmaxdepth=\maxdepth
        !          2035:   \global\dimen@=\pageheight \global\advance\dimen@ by-\ht\partialpage
        !          2036:   \global\setbox1=\vsplit255 to\dimen@ \global\setbox0=\vbox{\unvbox1}
        !          2037:   \global\setbox3=\vsplit255 to\dimen@ \global\setbox2=\vbox{\unvbox3}
        !          2038:   \ifdim\ht0>\dimen@ \setbox255=\vbox{\unvbox0\unvbox2} \global\setbox255=\copy5 \fi
        !          2039:   \ifdim\ht2>\dimen@ \setbox255=\vbox{\unvbox0\unvbox2} \global\setbox255=\copy5 \fi
        !          2040: }
        !          2041: \def\doublecolumnpagegoal{%
        !          2042:   \dimen@=\vsize \advance\dimen@ by-2\ht\partialpage \global\pagegoal=\dimen@
        !          2043: }
        !          2044: \def\pagesofar{\unvbox\partialpage %
        !          2045:   \hsize=\doublecolumnhsize % have to restore this since output routine
        !          2046:   \wd0=\hsize \wd2=\hsize \hbox to\pagewidth{\box0\hfil\box2}}
        !          2047: \def\doublecolumnout{%
        !          2048:   \setbox5=\copy255
        !          2049:   {\vbadness=10000 \doublecolumnsplit}
        !          2050:   \ifvbox255
        !          2051:     \setbox0=\vtop to\dimen@{\unvbox0}
        !          2052:     \setbox2=\vtop to\dimen@{\unvbox2}
        !          2053:     \onepageout\pagesofar \unvbox255 \penalty\outputpenalty
        !          2054:   \else
        !          2055:     \setbox0=\vbox{\unvbox5}
        !          2056:     \ifvbox0
        !          2057:       \dimen@=\ht0 \advance\dimen@ by\topskip \advance\dimen@ by-\baselineskip
        !          2058:       \divide\dimen@ by2 \splittopskip=\topskip \splitmaxdepth=\maxdepth
        !          2059:       {\vbadness=10000
        !          2060:        \loop \global\setbox5=\copy0
        !          2061:           \setbox1=\vsplit5 to\dimen@
        !          2062:           \setbox3=\vsplit5 to\dimen@
        !          2063:           \ifvbox5 \global\advance\dimen@ by1pt \repeat
        !          2064:         \setbox0=\vbox to\dimen@{\unvbox1}
        !          2065:         \setbox2=\vbox to\dimen@{\unvbox3}
        !          2066:         \global\setbox\partialpage=\vbox{\pagesofar}
        !          2067:         \doublecolumnpagegoal
        !          2068:       }
        !          2069:     \fi
        !          2070:   \fi
        !          2071: }
        !          2072: 
        !          2073: \catcode `\@=\other
        !          2074: \message{sectioning,}
        !          2075: % Define chapters, sections, etc.
        !          2076: 
        !          2077: \newcount \chapno
        !          2078: \newcount \secno        \secno=0
        !          2079: \newcount \subsecno     \subsecno=0
        !          2080: \newcount \subsubsecno  \subsubsecno=0
        !          2081: 
        !          2082: % This counter is funny since it counts through charcodes of letters A, B, ...
        !          2083: \newcount \appendixno  \appendixno = `\@
        !          2084: \def\appendixletter{\char\the\appendixno}
        !          2085: 
        !          2086: \newwrite \contentsfile
        !          2087: % This is called from \setfilename.
        !          2088: \def\opencontents{\openout \contentsfile = \jobname.toc}
        !          2089: 
        !          2090: % Each @chapter defines this as the name of the chapter.
        !          2091: % page headings and footings can use it.  @section does likewise
        !          2092: 
        !          2093: \def\thischapter{} \def\thissection{}
        !          2094: \def\seccheck#1{\if \pageno<0 %
        !          2095: \errmessage{@#1 not allowed after generating table of contents}\fi
        !          2096: %
        !          2097: }
        !          2098: 
        !          2099: \def\chapternofonts{%
        !          2100: \let\rawbackslash=\relax%
        !          2101: \let\frenchspacing=\relax%
        !          2102: \def\result{\realbackslash result}
        !          2103: \def\equiv{\realbackslash equiv}
        !          2104: \def\expansion{\realbackslash expansion}
        !          2105: \def\print{\realbackslash print}
        !          2106: \def\TeX{\realbackslash TeX}
        !          2107: \def\dots{\realbackslash dots}
        !          2108: \def\copyright{\realbackslash copyright}
        !          2109: \def\tt{\realbackslash tt}
        !          2110: \def\bf{\realbackslash bf }
        !          2111: \def\w{\realbackslash w}
        !          2112: \def\less{\realbackslash less}
        !          2113: \def\gtr{\realbackslash gtr}
        !          2114: \def\hat{\realbackslash hat}
        !          2115: \def\char{\realbackslash char}
        !          2116: \def\tclose##1{\realbackslash tclose {##1}}
        !          2117: \def\code##1{\realbackslash code {##1}}
        !          2118: \def\samp##1{\realbackslash samp {##1}}
        !          2119: \def\r##1{\realbackslash r {##1}}
        !          2120: \def\b##1{\realbackslash b {##1}}
        !          2121: \def\key##1{\realbackslash key {##1}}
        !          2122: \def\file##1{\realbackslash file {##1}}
        !          2123: \def\kbd##1{\realbackslash kbd {##1}}
        !          2124: % These are redefined because @smartitalic wouldn't work inside xdef.
        !          2125: \def\i##1{\realbackslash i {##1}}
        !          2126: \def\cite##1{\realbackslash cite {##1}}
        !          2127: \def\var##1{\realbackslash var {##1}}
        !          2128: \def\emph##1{\realbackslash emph {##1}}
        !          2129: \def\dfn##1{\realbackslash dfn {##1}}
        !          2130: }
        !          2131: 
        !          2132: \newcount\absseclevel % used to calculate proper heading level
        !          2133: \newcount\secbase\secbase=0 % @raise/lowersections modify this count
        !          2134: 
        !          2135: % @raisesections: treat @section as chapter, @subsection as section, etc.
        !          2136: \def\raisesections{\global\advance\secbase by -1}
        !          2137: \let\up=\raisesections % original BFox name
        !          2138: 
        !          2139: % @lowersections: treat @chapter as section, @section as subsection, etc.
        !          2140: \def\lowersections{\global\advance\secbase by 1}
        !          2141: \let\down=\lowersections % original BFox name
        !          2142: 
        !          2143: % Choose a numbered-heading macro
        !          2144: % #1 is heading level if unmodified by @raisesections or @lowersections
        !          2145: % #2 is text for heading
        !          2146: \def\numhead#1#2{\absseclevel=\secbase\advance\absseclevel by #1
        !          2147: \ifcase\absseclevel
        !          2148:   \chapterzzz{#2}
        !          2149: \or
        !          2150:   \seczzz{#2}
        !          2151: \or
        !          2152:   \numberedsubseczzz{#2}
        !          2153: \or
        !          2154:   \numberedsubsubseczzz{#2}
        !          2155: \else
        !          2156:   \ifnum \absseclevel<0
        !          2157:     \chapterzzz{#2}
        !          2158:   \else
        !          2159:     \numberedsubsubseczzz{#2}
        !          2160:   \fi
        !          2161: \fi
        !          2162: }
        !          2163: 
        !          2164: % like \numhead, but chooses appendix heading levels
        !          2165: \def\apphead#1#2{\absseclevel=\secbase\advance\absseclevel by #1
        !          2166: \ifcase\absseclevel
        !          2167:   \appendixzzz{#2}
        !          2168: \or
        !          2169:   \appendixsectionzzz{#2}
        !          2170: \or
        !          2171:   \appendixsubseczzz{#2}
        !          2172: \or
        !          2173:   \appendixsubsubseczzz{#2}
        !          2174: \else
        !          2175:   \ifnum \absseclevel<0
        !          2176:     \appendixzzz{#2}
        !          2177:   \else
        !          2178:     \appendixsubsubseczzz{#2}
        !          2179:   \fi
        !          2180: \fi
        !          2181: }
        !          2182: 
        !          2183: % like \numhead, but chooses numberless heading levels
        !          2184: \def\unnmhead#1#2{\absseclevel=\secbase\advance\absseclevel by #1
        !          2185: \ifcase\absseclevel
        !          2186:   \unnumberedzzz{#2}
        !          2187: \or
        !          2188:   \unnumberedseczzz{#2}
        !          2189: \or
        !          2190:   \unnumberedsubseczzz{#2}
        !          2191: \or
        !          2192:   \unnumberedsubsubseczzz{#2}
        !          2193: \else
        !          2194:   \ifnum \absseclevel<0
        !          2195:     \unnumberedzzz{#2}
        !          2196:   \else
        !          2197:     \unnumberedsubsubseczzz{#2}
        !          2198:   \fi
        !          2199: \fi
        !          2200: }
        !          2201: 
        !          2202: 
        !          2203: \def\thischaptername{No Chapter Title}
        !          2204: \outer\def\chapter{\parsearg\chapteryyy}
        !          2205: \def\chapteryyy #1{\numhead0{#1}} % normally numhead0 calls chapterzzz
        !          2206: \def\chapterzzz #1{\seccheck{chapter}%
        !          2207: \secno=0 \subsecno=0 \subsubsecno=0
        !          2208: \global\advance \chapno by 1 \message{Chapter \the\chapno}%
        !          2209: \chapmacro {#1}{\the\chapno}%
        !          2210: \gdef\thissection{#1}%
        !          2211: \gdef\thischaptername{#1}%
        !          2212: % We don't substitute the actual chapter name into \thischapter
        !          2213: % because we don't want its macros evaluated now.
        !          2214: \xdef\thischapter{Chapter \the\chapno: \noexpand\thischaptername}%
        !          2215: {\chapternofonts%
        !          2216: \edef\temp{{\realbackslash chapentry {#1}{\the\chapno}{\noexpand\folio}}}%
        !          2217: \escapechar=`\\%
        !          2218: \write \contentsfile \temp  %
        !          2219: \donoderef %
        !          2220: \global\let\section = \numberedsec
        !          2221: \global\let\subsection = \numberedsubsec
        !          2222: \global\let\subsubsection = \numberedsubsubsec
        !          2223: }}
        !          2224: 
        !          2225: \outer\def\appendix{\parsearg\appendixyyy}
        !          2226: \def\appendixyyy #1{\apphead0{#1}} % normally apphead0 calls appendixzzz
        !          2227: \def\appendixzzz #1{\seccheck{appendix}%
        !          2228: \secno=0 \subsecno=0 \subsubsecno=0
        !          2229: \global\advance \appendixno by 1 \message{Appendix \appendixletter}%
        !          2230: \chapmacro {#1}{Appendix \appendixletter}%
        !          2231: \gdef\thissection{#1}%
        !          2232: \gdef\thischaptername{#1}%
        !          2233: \xdef\thischapter{Appendix \appendixletter: \noexpand\thischaptername}%
        !          2234: {\chapternofonts%
        !          2235: \edef\temp{{\realbackslash chapentry
        !          2236:   {#1}{Appendix \appendixletter}{\noexpand\folio}}}%
        !          2237: \escapechar=`\\%
        !          2238: \write \contentsfile \temp  %
        !          2239: \appendixnoderef %
        !          2240: \global\let\section = \appendixsec
        !          2241: \global\let\subsection = \appendixsubsec
        !          2242: \global\let\subsubsection = \appendixsubsubsec
        !          2243: }}
        !          2244: 
        !          2245: \outer\def\top{\parsearg\unnumberedyyy}
        !          2246: \outer\def\unnumbered{\parsearg\unnumberedyyy}
        !          2247: \def\unnumberedyyy #1{\unnmhead0{#1}} % normally unnmhead0 calls unnumberedzzz
        !          2248: \def\unnumberedzzz #1{\seccheck{unnumbered}%
        !          2249: \secno=0 \subsecno=0 \subsubsecno=0
        !          2250: %
        !          2251: % This used to be simply \message{#1}, but TeX fully expands the
        !          2252: % argument to \message.  Therefore, if #1 contained @-commands, TeX
        !          2253: % expanded them.  For example, in `@unnumbered The @cite{Book}', TeX
        !          2254: % expanded @cite (which turns out to cause errors because \cite is meant
        !          2255: % to be executed, not expanded).
        !          2256: %
        !          2257: % Anyway, we don't want the fully-expanded definition of @cite to appear
        !          2258: % as a result of the \message, we just want `@cite' itself.  We use
        !          2259: % \the<toks register> to achieve this: TeX expands \the<toks> only once,
        !          2260: % simply yielding the contents of the <toks register>.
        !          2261: \toks0 = {#1}\message{(\the\toks0)}%
        !          2262: %
        !          2263: \unnumbchapmacro {#1}%
        !          2264: \gdef\thischapter{#1}\gdef\thissection{#1}%
        !          2265: {\chapternofonts%
        !          2266: \edef\temp{{\realbackslash unnumbchapentry {#1}{\noexpand\folio}}}%
        !          2267: \escapechar=`\\%
        !          2268: \write \contentsfile \temp  %
        !          2269: \unnumbnoderef %
        !          2270: \global\let\section = \unnumberedsec
        !          2271: \global\let\subsection = \unnumberedsubsec
        !          2272: \global\let\subsubsection = \unnumberedsubsubsec
        !          2273: }}
        !          2274: 
        !          2275: \outer\def\numberedsec{\parsearg\secyyy}
        !          2276: \def\secyyy #1{\numhead1{#1}} % normally calls seczzz
        !          2277: \def\seczzz #1{\seccheck{section}%
        !          2278: \subsecno=0 \subsubsecno=0 \global\advance \secno by 1 %
        !          2279: \gdef\thissection{#1}\secheading {#1}{\the\chapno}{\the\secno}%
        !          2280: {\chapternofonts%
        !          2281: \edef\temp{{\realbackslash secentry %
        !          2282: {#1}{\the\chapno}{\the\secno}{\noexpand\folio}}}%
        !          2283: \escapechar=`\\%
        !          2284: \write \contentsfile \temp %
        !          2285: \donoderef %
        !          2286: \penalty 10000 %
        !          2287: }}
        !          2288: 
        !          2289: \outer\def\appenixsection{\parsearg\appendixsecyyy}
        !          2290: \outer\def\appendixsec{\parsearg\appendixsecyyy}
        !          2291: \def\appendixsecyyy #1{\apphead1{#1}} % normally calls appendixsectionzzz
        !          2292: \def\appendixsectionzzz #1{\seccheck{appendixsection}%
        !          2293: \subsecno=0 \subsubsecno=0 \global\advance \secno by 1 %
        !          2294: \gdef\thissection{#1}\secheading {#1}{\appendixletter}{\the\secno}%
        !          2295: {\chapternofonts%
        !          2296: \edef\temp{{\realbackslash secentry %
        !          2297: {#1}{\appendixletter}{\the\secno}{\noexpand\folio}}}%
        !          2298: \escapechar=`\\%
        !          2299: \write \contentsfile \temp %
        !          2300: \appendixnoderef %
        !          2301: \penalty 10000 %
        !          2302: }}
        !          2303: 
        !          2304: \outer\def\unnumberedsec{\parsearg\unnumberedsecyyy}
        !          2305: \def\unnumberedsecyyy #1{\unnmhead1{#1}} % normally calls unnumberedseczzz
        !          2306: \def\unnumberedseczzz #1{\seccheck{unnumberedsec}%
        !          2307: \plainsecheading {#1}\gdef\thissection{#1}%
        !          2308: {\chapternofonts%
        !          2309: \edef\temp{{\realbackslash unnumbsecentry{#1}{\noexpand\folio}}}%
        !          2310: \escapechar=`\\%
        !          2311: \write \contentsfile \temp %
        !          2312: \unnumbnoderef %
        !          2313: \penalty 10000 %
        !          2314: }}
        !          2315: 
        !          2316: \outer\def\numberedsubsec{\parsearg\numberedsubsecyyy}
        !          2317: \def\numberedsubsecyyy #1{\numhead2{#1}} % normally calls numberedsubseczzz
        !          2318: \def\numberedsubseczzz #1{\seccheck{subsection}%
        !          2319: \gdef\thissection{#1}\subsubsecno=0 \global\advance \subsecno by 1 %
        !          2320: \subsecheading {#1}{\the\chapno}{\the\secno}{\the\subsecno}%
        !          2321: {\chapternofonts%
        !          2322: \edef\temp{{\realbackslash subsecentry %
        !          2323: {#1}{\the\chapno}{\the\secno}{\the\subsecno}{\noexpand\folio}}}%
        !          2324: \escapechar=`\\%
        !          2325: \write \contentsfile \temp %
        !          2326: \donoderef %
        !          2327: \penalty 10000 %
        !          2328: }}
        !          2329: 
        !          2330: \outer\def\appendixsubsec{\parsearg\appendixsubsecyyy}
        !          2331: \def\appendixsubsecyyy #1{\apphead2{#1}} % normally calls appendixsubseczzz
        !          2332: \def\appendixsubseczzz #1{\seccheck{appendixsubsec}%
        !          2333: \gdef\thissection{#1}\subsubsecno=0 \global\advance \subsecno by 1 %
        !          2334: \subsecheading {#1}{\appendixletter}{\the\secno}{\the\subsecno}%
        !          2335: {\chapternofonts%
        !          2336: \edef\temp{{\realbackslash subsecentry %
        !          2337: {#1}{\appendixletter}{\the\secno}{\the\subsecno}{\noexpand\folio}}}%
        !          2338: \escapechar=`\\%
        !          2339: \write \contentsfile \temp %
        !          2340: \appendixnoderef %
        !          2341: \penalty 10000 %
        !          2342: }}
        !          2343: 
        !          2344: \outer\def\unnumberedsubsec{\parsearg\unnumberedsubsecyyy}
        !          2345: \def\unnumberedsubsecyyy #1{\unnmhead2{#1}} %normally calls unnumberedsubseczzz
        !          2346: \def\unnumberedsubseczzz #1{\seccheck{unnumberedsubsec}%
        !          2347: \plainsecheading {#1}\gdef\thissection{#1}%
        !          2348: {\chapternofonts%
        !          2349: \edef\temp{{\realbackslash unnumbsubsecentry{#1}{\noexpand\folio}}}%
        !          2350: \escapechar=`\\%
        !          2351: \write \contentsfile \temp %
        !          2352: \unnumbnoderef %
        !          2353: \penalty 10000 %
        !          2354: }}
        !          2355: 
        !          2356: \outer\def\numberedsubsubsec{\parsearg\numberedsubsubsecyyy}
        !          2357: \def\numberedsubsubsecyyy #1{\numhead3{#1}} % normally numberedsubsubseczzz
        !          2358: \def\numberedsubsubseczzz #1{\seccheck{subsubsection}%
        !          2359: \gdef\thissection{#1}\global\advance \subsubsecno by 1 %
        !          2360: \subsubsecheading {#1}
        !          2361:   {\the\chapno}{\the\secno}{\the\subsecno}{\the\subsubsecno}%
        !          2362: {\chapternofonts%
        !          2363: \edef\temp{{\realbackslash subsubsecentry %
        !          2364:   {#1}
        !          2365:   {\the\chapno}{\the\secno}{\the\subsecno}{\the\subsubsecno}
        !          2366:   {\noexpand\folio}}}%
        !          2367: \escapechar=`\\%
        !          2368: \write \contentsfile \temp %
        !          2369: \donoderef %
        !          2370: \penalty 10000 %
        !          2371: }}
        !          2372: 
        !          2373: \outer\def\appendixsubsubsec{\parsearg\appendixsubsubsecyyy}
        !          2374: \def\appendixsubsubsecyyy #1{\apphead3{#1}} % normally appendixsubsubseczzz
        !          2375: \def\appendixsubsubseczzz #1{\seccheck{appendixsubsubsec}%
        !          2376: \gdef\thissection{#1}\global\advance \subsubsecno by 1 %
        !          2377: \subsubsecheading {#1}
        !          2378:   {\appendixletter}{\the\secno}{\the\subsecno}{\the\subsubsecno}%
        !          2379: {\chapternofonts%
        !          2380: \edef\temp{{\realbackslash subsubsecentry{#1}%
        !          2381:   {\appendixletter}
        !          2382:   {\the\secno}{\the\subsecno}{\the\subsubsecno}{\noexpand\folio}}}%
        !          2383: \escapechar=`\\%
        !          2384: \write \contentsfile \temp %
        !          2385: \appendixnoderef %
        !          2386: \penalty 10000 %
        !          2387: }}
        !          2388: 
        !          2389: \outer\def\unnumberedsubsubsec{\parsearg\unnumberedsubsubsecyyy}
        !          2390: \def\unnumberedsubsubsecyyy #1{\unnmhead3{#1}} %normally unnumberedsubsubseczzz
        !          2391: \def\unnumberedsubsubseczzz #1{\seccheck{unnumberedsubsubsec}%
        !          2392: \plainsecheading {#1}\gdef\thissection{#1}%
        !          2393: {\chapternofonts%
        !          2394: \edef\temp{{\realbackslash unnumbsubsubsecentry{#1}{\noexpand\folio}}}%
        !          2395: \escapechar=`\\%
        !          2396: \write \contentsfile \temp %
        !          2397: \unnumbnoderef %
        !          2398: \penalty 10000 %
        !          2399: }}
        !          2400: 
        !          2401: % These are variants which are not "outer", so they can appear in @ifinfo.
        !          2402: % Actually, they should now be obsolete; ordinary section commands should work.
        !          2403: \def\infotop{\parsearg\unnumberedzzz}
        !          2404: \def\infounnumbered{\parsearg\unnumberedzzz}
        !          2405: \def\infounnumberedsec{\parsearg\unnumberedseczzz}
        !          2406: \def\infounnumberedsubsec{\parsearg\unnumberedsubseczzz}
        !          2407: \def\infounnumberedsubsubsec{\parsearg\unnumberedsubsubseczzz}
        !          2408: 
        !          2409: \def\infoappendix{\parsearg\appendixzzz}
        !          2410: \def\infoappendixsec{\parsearg\appendixseczzz}
        !          2411: \def\infoappendixsubsec{\parsearg\appendixsubseczzz}
        !          2412: \def\infoappendixsubsubsec{\parsearg\appendixsubsubseczzz}
        !          2413: 
        !          2414: \def\infochapter{\parsearg\chapterzzz}
        !          2415: \def\infosection{\parsearg\sectionzzz}
        !          2416: \def\infosubsection{\parsearg\subsectionzzz}
        !          2417: \def\infosubsubsection{\parsearg\subsubsectionzzz}
        !          2418: 
        !          2419: % These macros control what the section commands do, according
        !          2420: % to what kind of chapter we are in (ordinary, appendix, or unnumbered).
        !          2421: % Define them by default for a numbered chapter.
        !          2422: \global\let\section = \numberedsec
        !          2423: \global\let\subsection = \numberedsubsec
        !          2424: \global\let\subsubsection = \numberedsubsubsec
        !          2425: 
        !          2426: % Define @majorheading, @heading and @subheading
        !          2427: 
        !          2428: % NOTE on use of \vbox for chapter headings, section headings, and
        !          2429: % such:
        !          2430: %      1) We use \vbox rather than the earlier \line to permit
        !          2431: %         overlong headings to fold.
        !          2432: %      2) \hyphenpenalty is set to 10000 because hyphenation in a
        !          2433: %         heading is obnoxious; this forbids it.
        !          2434: %       3) Likewise, headings look best if no \parindent is used, and
        !          2435: %          if justification is not attempted.  Hence \raggedright.
        !          2436: 
        !          2437: 
        !          2438: \def\majorheading{\parsearg\majorheadingzzz}
        !          2439: \def\majorheadingzzz #1{%
        !          2440: {\advance\chapheadingskip by 10pt \chapbreak }%
        !          2441: {\chapfonts \vbox{\hyphenpenalty=10000\tolerance=5000
        !          2442:                   \parindent=0pt\raggedright
        !          2443:                   \rm #1\hfill}}\bigskip \par\penalty 200}
        !          2444: 
        !          2445: \def\chapheading{\parsearg\chapheadingzzz}
        !          2446: \def\chapheadingzzz #1{\chapbreak %
        !          2447: {\chapfonts \vbox{\hyphenpenalty=10000\tolerance=5000
        !          2448:                   \parindent=0pt\raggedright
        !          2449:                   \rm #1\hfill}}\bigskip \par\penalty 200}
        !          2450: 
        !          2451: \def\heading{\parsearg\secheadingi}
        !          2452: 
        !          2453: \def\subheading{\parsearg\subsecheadingi}
        !          2454: 
        !          2455: \def\subsubheading{\parsearg\subsubsecheadingi}
        !          2456: 
        !          2457: % These macros generate a chapter, section, etc. heading only
        !          2458: % (including whitespace, linebreaking, etc. around it),
        !          2459: % given all the information in convenient, parsed form.
        !          2460: 
        !          2461: %%% Args are the skip and penalty (usually negative)
        !          2462: \def\dobreak#1#2{\par\ifdim\lastskip<#1\removelastskip\penalty#2\vskip#1\fi}
        !          2463: 
        !          2464: \def\setchapterstyle #1 {\csname CHAPF#1\endcsname}
        !          2465: 
        !          2466: %%% Define plain chapter starts, and page on/off switching for it
        !          2467: % Parameter controlling skip before chapter headings (if needed)
        !          2468: 
        !          2469: \newskip \chapheadingskip \chapheadingskip = 30pt plus 8pt minus 4pt
        !          2470: 
        !          2471: \def\chapbreak{\dobreak \chapheadingskip {-4000}}
        !          2472: \def\chappager{\par\vfill\supereject}
        !          2473: \def\chapoddpage{\chappager \ifodd\pageno \else \hbox to 0pt{} \chappager\fi}
        !          2474: 
        !          2475: \def\setchapternewpage #1 {\csname CHAPPAG#1\endcsname}
        !          2476: 
        !          2477: \def\CHAPPAGoff{
        !          2478: \global\let\pchapsepmacro=\chapbreak
        !          2479: \global\let\pagealignmacro=\chappager}
        !          2480: 
        !          2481: \def\CHAPPAGon{
        !          2482: \global\let\pchapsepmacro=\chappager
        !          2483: \global\let\pagealignmacro=\chappager
        !          2484: \global\def\HEADINGSon{\HEADINGSsingle}}
        !          2485: 
        !          2486: \def\CHAPPAGodd{
        !          2487: \global\let\pchapsepmacro=\chapoddpage
        !          2488: \global\let\pagealignmacro=\chapoddpage
        !          2489: \global\def\HEADINGSon{\HEADINGSdouble}}
        !          2490: 
        !          2491: \CHAPPAGon
        !          2492: 
        !          2493: \def\CHAPFplain{
        !          2494: \global\let\chapmacro=\chfplain
        !          2495: \global\let\unnumbchapmacro=\unnchfplain}
        !          2496: 
        !          2497: \def\chfplain #1#2{%
        !          2498:   \pchapsepmacro
        !          2499:   {%
        !          2500:     \chapfonts \vbox{\hyphenpenalty=10000\tolerance=5000
        !          2501:                      \parindent=0pt\raggedright
        !          2502:                      \rm #2\enspace #1}%
        !          2503:   }%
        !          2504:   \bigskip
        !          2505:   \penalty5000
        !          2506: }
        !          2507: 
        !          2508: \def\unnchfplain #1{%
        !          2509: \pchapsepmacro %
        !          2510: {\chapfonts \vbox{\hyphenpenalty=10000\tolerance=5000
        !          2511:                   \parindent=0pt\raggedright
        !          2512:                   \rm #1\hfill}}\bigskip \par\penalty 10000 %
        !          2513: }
        !          2514: \CHAPFplain % The default
        !          2515: 
        !          2516: \def\unnchfopen #1{%
        !          2517: \chapoddpage {\chapfonts \vbox{\hyphenpenalty=10000\tolerance=5000
        !          2518:                        \parindent=0pt\raggedright
        !          2519:                        \rm #1\hfill}}\bigskip \par\penalty 10000 %
        !          2520: }
        !          2521: 
        !          2522: \def\chfopen #1#2{\chapoddpage {\chapfonts
        !          2523: \vbox to 3in{\vfil \hbox to\hsize{\hfil #2} \hbox to\hsize{\hfil #1} \vfil}}%
        !          2524: \par\penalty 5000 %
        !          2525: }
        !          2526: 
        !          2527: \def\CHAPFopen{
        !          2528: \global\let\chapmacro=\chfopen
        !          2529: \global\let\unnumbchapmacro=\unnchfopen}
        !          2530: 
        !          2531: % Parameter controlling skip before section headings.
        !          2532: 
        !          2533: \newskip \subsecheadingskip  \subsecheadingskip = 17pt plus 8pt minus 4pt
        !          2534: \def\subsecheadingbreak{\dobreak \subsecheadingskip {-500}}
        !          2535: 
        !          2536: \newskip \secheadingskip  \secheadingskip = 21pt plus 8pt minus 4pt
        !          2537: \def\secheadingbreak{\dobreak \secheadingskip {-1000}}
        !          2538: 
        !          2539: % @paragraphindent  is defined for the Info formatting commands only.
        !          2540: \let\paragraphindent=\comment
        !          2541: 
        !          2542: % Section fonts are the base font at magstep2, which produces
        !          2543: % a size a bit more than 14 points in the default situation.
        !          2544: 
        !          2545: \def\secheading #1#2#3{\secheadingi {#2.#3\enspace #1}}
        !          2546: \def\plainsecheading #1{\secheadingi {#1}}
        !          2547: \def\secheadingi #1{{\advance \secheadingskip by \parskip %
        !          2548: \secheadingbreak}%
        !          2549: {\secfonts \vbox{\hyphenpenalty=10000\tolerance=5000
        !          2550:                  \parindent=0pt\raggedright
        !          2551:                  \rm #1\hfill}}%
        !          2552: \ifdim \parskip<10pt \kern 10pt\kern -\parskip\fi \penalty 10000 }
        !          2553: 
        !          2554: 
        !          2555: % Subsection fonts are the base font at magstep1,
        !          2556: % which produces a size of 12 points.
        !          2557: 
        !          2558: \def\subsecheading #1#2#3#4{\subsecheadingi {#2.#3.#4\enspace #1}}
        !          2559: \def\subsecheadingi #1{{\advance \subsecheadingskip by \parskip %
        !          2560: \subsecheadingbreak}%
        !          2561: {\subsecfonts \vbox{\hyphenpenalty=10000\tolerance=5000
        !          2562:                      \parindent=0pt\raggedright
        !          2563:                      \rm #1\hfill}}%
        !          2564: \ifdim \parskip<10pt \kern 10pt\kern -\parskip\fi \penalty 10000 }
        !          2565: 
        !          2566: \def\subsubsecfonts{\subsecfonts} % Maybe this should change:
        !          2567:                                  % Perhaps make sssec fonts scaled
        !          2568:                                  % magstep half
        !          2569: \def\subsubsecheading #1#2#3#4#5{\subsubsecheadingi {#2.#3.#4.#5\enspace #1}}
        !          2570: \def\subsubsecheadingi #1{{\advance \subsecheadingskip by \parskip %
        !          2571: \subsecheadingbreak}%
        !          2572: {\subsubsecfonts \vbox{\hyphenpenalty=10000\tolerance=5000
        !          2573:                        \parindent=0pt\raggedright
        !          2574:                        \rm #1\hfill}}%
        !          2575: \ifdim \parskip<10pt \kern 10pt\kern -\parskip\fi \penalty 10000}
        !          2576: 
        !          2577: 
        !          2578: \message{toc printing,}
        !          2579: 
        !          2580: % Finish up the main text and prepare to read what we've written
        !          2581: % to \contentsfile.
        !          2582: 
        !          2583: \newskip\contentsrightmargin \contentsrightmargin=1in
        !          2584: \def\startcontents#1{%
        !          2585:    \pagealignmacro
        !          2586:    \immediate\closeout \contentsfile
        !          2587:    \ifnum \pageno>0
        !          2588:       \pageno = -1             % Request roman numbered pages.
        !          2589:    \fi
        !          2590:    % Don't need to put `Contents' or `Short Contents' in the headline.
        !          2591:    % It is abundantly clear what they are.
        !          2592:    \unnumbchapmacro{#1}\def\thischapter{}%
        !          2593:    \begingroup                 % Set up to handle contents files properly.
        !          2594:       \catcode`\\=0  \catcode`\{=1  \catcode`\}=2  \catcode`\@=11
        !          2595:       \raggedbottom             % Worry more about breakpoints than the bottom.
        !          2596:       \advance\hsize by -\contentsrightmargin % Don't use the full line length.
        !          2597: }
        !          2598: 
        !          2599: 
        !          2600: % Normal (long) toc.
        !          2601: \outer\def\contents{%
        !          2602:    \startcontents{Table of Contents}%
        !          2603:       \input \jobname.toc
        !          2604:    \endgroup
        !          2605:    \vfill \eject
        !          2606: }
        !          2607: 
        !          2608: % And just the chapters.
        !          2609: \outer\def\summarycontents{%
        !          2610:    \startcontents{Short Contents}%
        !          2611:       %
        !          2612:       \let\chapentry = \shortchapentry
        !          2613:       \let\unnumbchapentry = \shortunnumberedentry
        !          2614:       % We want a true roman here for the page numbers.
        !          2615:       \secfonts
        !          2616:       \let\rm=\shortcontrm \let\bf=\shortcontbf \let\sl=\shortcontsl
        !          2617:       \rm
        !          2618:       \advance\baselineskip by 1pt % Open it up a little.
        !          2619:       \def\secentry ##1##2##3##4{}
        !          2620:       \def\unnumbsecentry ##1##2{}
        !          2621:       \def\subsecentry ##1##2##3##4##5{}
        !          2622:       \def\unnumbsubsecentry ##1##2{}
        !          2623:       \def\subsubsecentry ##1##2##3##4##5##6{}
        !          2624:       \def\unnumbsubsubsecentry ##1##2{}
        !          2625:       \input \jobname.toc
        !          2626:    \endgroup
        !          2627:    \vfill \eject
        !          2628: }
        !          2629: \let\shortcontents = \summarycontents
        !          2630: 
        !          2631: % These macros generate individual entries in the table of contents.
        !          2632: % The first argument is the chapter or section name.
        !          2633: % The last argument is the page number.
        !          2634: % The arguments in between are the chapter number, section number, ...
        !          2635: 
        !          2636: % Chapter-level things, for both the long and short contents.
        !          2637: \def\chapentry#1#2#3{\dochapentry{#2\labelspace#1}{#3}}
        !          2638: 
        !          2639: % See comments in \dochapentry re vbox and related settings
        !          2640: \def\shortchapentry#1#2#3{%
        !          2641:   \tocentry{\shortchaplabel{#2}\labelspace #1}{\doshortpageno{#3}}%
        !          2642: }
        !          2643: 
        !          2644: % Typeset the label for a chapter or appendix for the short contents.
        !          2645: % The arg is, e.g. `Appendix A' for an appendix, or `3' for a chapter.
        !          2646: % We could simplify the code here by writing out an \appendixentry
        !          2647: % command in the toc file for appendices, instead of using \chapentry
        !          2648: % for both, but it doesn't seem worth it.
        !          2649: \setbox0 = \hbox{\shortcontrm Appendix }
        !          2650: \newdimen\shortappendixwidth \shortappendixwidth = \wd0
        !          2651: 
        !          2652: \def\shortchaplabel#1{%
        !          2653:   % We typeset #1 in a box of constant width, regardless of the text of
        !          2654:   % #1, so the chapter titles will come out aligned.
        !          2655:   \setbox0 = \hbox{#1}%
        !          2656:   \dimen0 = \ifdim\wd0 > \shortappendixwidth \shortappendixwidth \else 0pt \fi
        !          2657:   %
        !          2658:   % This space should be plenty, since a single number is .5em, and the
        !          2659:   % widest letter (M) is 1em, at least in the Computer Modern fonts.
        !          2660:   % (This space doesn't include the extra space that gets added after
        !          2661:   % the label; that gets put in in \shortchapentry above.)
        !          2662:   \advance\dimen0 by 1.1em
        !          2663:   \hbox to \dimen0{#1\hfil}%
        !          2664: }
        !          2665: 
        !          2666: \def\unnumbchapentry#1#2{\dochapentry{#1}{#2}}
        !          2667: \def\shortunnumberedentry#1#2{\tocentry{#1}{\doshortpageno{#2}}}
        !          2668: 
        !          2669: % Sections.
        !          2670: \def\secentry#1#2#3#4{\dosecentry{#2.#3\labelspace#1}{#4}}
        !          2671: \def\unnumbsecentry#1#2{\dosecentry{#1}{#2}}
        !          2672: 
        !          2673: % Subsections.
        !          2674: \def\subsecentry#1#2#3#4#5{\dosubsecentry{#2.#3.#4\labelspace#1}{#5}}
        !          2675: \def\unnumbsubsecentry#1#2{\dosubsecentry{#1}{#2}}
        !          2676: 
        !          2677: % And subsubsections.
        !          2678: \def\subsubsecentry#1#2#3#4#5#6{%
        !          2679:   \dosubsubsecentry{#2.#3.#4.#5\labelspace#1}{#6}}
        !          2680: \def\unnumbsubsubsecentry#1#2{\dosubsubsecentry{#1}{#2}}
        !          2681: 
        !          2682: 
        !          2683: % This parameter controls the indentation of the various levels.
        !          2684: \newdimen\tocindent \tocindent = 3pc
        !          2685: 
        !          2686: % Now for the actual typesetting. In all these, #1 is the text and #2 is the
        !          2687: % page number.
        !          2688: %
        !          2689: % If the toc has to be broken over pages, we would want to be at chapters
        !          2690: % if at all possible; hence the \penalty.
        !          2691: \def\dochapentry#1#2{%
        !          2692:    \penalty-300 \vskip\baselineskip
        !          2693:    \begingroup
        !          2694:      \chapentryfonts
        !          2695:      \tocentry{#1}{\dopageno{#2}}%
        !          2696:    \endgroup
        !          2697:    \nobreak\vskip .25\baselineskip
        !          2698: }
        !          2699: 
        !          2700: \def\dosecentry#1#2{\begingroup
        !          2701:   \secentryfonts \leftskip=\tocindent
        !          2702:   \tocentry{#1}{\dopageno{#2}}%
        !          2703: \endgroup}
        !          2704: 
        !          2705: \def\dosubsecentry#1#2{\begingroup
        !          2706:   \subsecentryfonts \leftskip=2\tocindent
        !          2707:   \tocentry{#1}{\dopageno{#2}}%
        !          2708: \endgroup}
        !          2709: 
        !          2710: \def\dosubsubsecentry#1#2{\begingroup
        !          2711:   \subsubsecentryfonts \leftskip=3\tocindent
        !          2712:   \tocentry{#1}{\dopageno{#2}}%
        !          2713: \endgroup}
        !          2714: 
        !          2715: % Final typesetting of a toc entry; we use the same \entry macro as for
        !          2716: % the index entries, but we want to suppress hyphenation here.  (We
        !          2717: % can't do that in the \entry macro, since index entries might consist
        !          2718: % of hyphenated-identifiers-that-do-not-fit-on-a-line-and-nothing-else.)
        !          2719: %
        !          2720: \def\tocentry#1#2{\begingroup
        !          2721:   \hyphenpenalty = 10000
        !          2722:   \entry{#1}{#2}%
        !          2723: \endgroup}
        !          2724: 
        !          2725: % Space between chapter (or whatever) number and the title.
        !          2726: \def\labelspace{\hskip1em \relax}
        !          2727: 
        !          2728: \def\dopageno#1{{\rm #1}}
        !          2729: \def\doshortpageno#1{{\rm #1}}
        !          2730: 
        !          2731: \def\chapentryfonts{\secfonts \rm}
        !          2732: \def\secentryfonts{\textfonts}
        !          2733: \let\subsecentryfonts = \textfonts
        !          2734: \let\subsubsecentryfonts = \textfonts
        !          2735: 
        !          2736: 
        !          2737: \message{environments,}
        !          2738: 
        !          2739: % Since these characters are used in examples, it should be an even number of
        !          2740: % \tt widths. Each \tt character is 1en, so two makes it 1em.
        !          2741: % Furthermore, these definitions must come after we define our fonts.
        !          2742: \newbox\dblarrowbox    \newbox\longdblarrowbox
        !          2743: \newbox\pushcharbox    \newbox\bullbox
        !          2744: \newbox\equivbox       \newbox\errorbox
        !          2745: 
        !          2746: \let\ptexequiv = \equiv
        !          2747: 
        !          2748: %{\tentt
        !          2749: %\global\setbox\dblarrowbox = \hbox to 1em{\hfil$\Rightarrow$\hfil}
        !          2750: %\global\setbox\longdblarrowbox = \hbox to 1em{\hfil$\mapsto$\hfil}
        !          2751: %\global\setbox\pushcharbox = \hbox to 1em{\hfil$\dashv$\hfil}
        !          2752: %\global\setbox\equivbox = \hbox to 1em{\hfil$\ptexequiv$\hfil}
        !          2753: % Adapted from the manmac format (p.420 of TeXbook)
        !          2754: %\global\setbox\bullbox = \hbox to 1em{\kern.15em\vrule height .75ex width .85ex
        !          2755: %                                      depth .1ex\hfil}
        !          2756: %}
        !          2757: 
        !          2758: \def\point{$\star$}
        !          2759: 
        !          2760: \def\result{\leavevmode\raise.15ex\hbox to 1em{\hfil$\Rightarrow$\hfil}}
        !          2761: \def\expansion{\leavevmode\raise.1ex\hbox to 1em{\hfil$\mapsto$\hfil}}
        !          2762: \def\print{\leavevmode\lower.1ex\hbox to 1em{\hfil$\dashv$\hfil}}
        !          2763: 
        !          2764: \def\equiv{\leavevmode\lower.1ex\hbox to 1em{\hfil$\ptexequiv$\hfil}}
        !          2765: 
        !          2766: % Adapted from the TeXbook's \boxit.
        !          2767: {\tentt \global\dimen0 = 3em}% Width of the box.
        !          2768: \dimen2 = .55pt % Thickness of rules
        !          2769: % The text. (`r' is open on the right, `e' somewhat less so on the left.)
        !          2770: \setbox0 = \hbox{\kern-.75pt \tensf error\kern-1.5pt}
        !          2771: 
        !          2772: \global\setbox\errorbox=\hbox to \dimen0{\hfil
        !          2773:    \hsize = \dimen0 \advance\hsize by -5.8pt % Space to left+right.
        !          2774:    \advance\hsize by -2\dimen2 % Rules.
        !          2775:    \vbox{
        !          2776:       \hrule height\dimen2
        !          2777:       \hbox{\vrule width\dimen2 \kern3pt          % Space to left of text.
        !          2778:          \vtop{\kern2.4pt \box0 \kern2.4pt}% Space above/below.
        !          2779:          \kern3pt\vrule width\dimen2}% Space to right.
        !          2780:       \hrule height\dimen2}
        !          2781:     \hfil}
        !          2782: 
        !          2783: % The @error{} command.
        !          2784: \def\error{\leavevmode\lower.7ex\copy\errorbox}
        !          2785: 
        !          2786: % @tex ... @end tex    escapes into raw Tex temporarily.
        !          2787: % One exception: @ is still an escape character, so that @end tex works.
        !          2788: % But \@ or @@ will get a plain tex @ character.
        !          2789: 
        !          2790: \def\tex{\begingroup
        !          2791: \catcode `\\=0 \catcode `\{=1 \catcode `\}=2
        !          2792: \catcode `\$=3 \catcode `\&=4 \catcode `\#=6
        !          2793: \catcode `\^=7 \catcode `\_=8 \catcode `\~=13 \let~=\tie
        !          2794: \catcode `\%=14
        !          2795: \catcode 43=12
        !          2796: \catcode`\"=12
        !          2797: \catcode`\==12
        !          2798: \catcode`\|=12
        !          2799: \catcode`\<=12
        !          2800: \catcode`\>=12
        !          2801: \escapechar=`\\
        !          2802: %
        !          2803: \let\{=\ptexlbrace
        !          2804: \let\}=\ptexrbrace
        !          2805: \let\.=\ptexdot
        !          2806: \let\*=\ptexstar
        !          2807: \let\dots=\ptexdots
        !          2808: \def\@{@}%
        !          2809: \let\bullet=\ptexbullet
        !          2810: \let\b=\ptexb \let\c=\ptexc \let\i=\ptexi \let\t=\ptext \let\l=\ptexl
        !          2811: \let\L=\ptexL
        !          2812: %
        !          2813: \let\Etex=\endgroup}
        !          2814: 
        !          2815: % Define @lisp ... @endlisp.
        !          2816: % @lisp does a \begingroup so it can rebind things,
        !          2817: % including the definition of @endlisp (which normally is erroneous).
        !          2818: 
        !          2819: % Amount to narrow the margins by for @lisp.
        !          2820: \newskip\lispnarrowing \lispnarrowing=0.4in
        !          2821: 
        !          2822: % This is the definition that ^^M gets inside @lisp, @example, and other
        !          2823: % such environments.  \null is better than a space, since it doesn't
        !          2824: % have any width.
        !          2825: \def\lisppar{\null\endgraf}
        !          2826: 
        !          2827: % Make each space character in the input produce a normal interword
        !          2828: % space in the output.  Don't allow a line break at this space, as this
        !          2829: % is used only in environments like @example, where each line of input
        !          2830: % should produce a line of output anyway.
        !          2831: %
        !          2832: {\obeyspaces %
        !          2833: \gdef\sepspaces{\obeyspaces\let =\tie}}
        !          2834: 
        !          2835: % Define \obeyedspace to be our active space, whatever it is.  This is
        !          2836: % for use in \parsearg.
        !          2837: {\sepspaces %
        !          2838: \global\let\obeyedspace= }
        !          2839: 
        !          2840: % This space is always present above and below environments.
        !          2841: \newskip\envskipamount \envskipamount = 0pt
        !          2842: 
        !          2843: % Make spacing and below environment symmetrical.  We use \parskip here
        !          2844: % to help in doing that, since in @example-like environments \parskip
        !          2845: % is reset to zero; thus the \afterenvbreak inserts no space -- but the
        !          2846: % start of the next paragraph will insert \parskip
        !          2847: %
        !          2848: \def\aboveenvbreak{{\advance\envskipamount by \parskip
        !          2849: \endgraf \ifdim\lastskip<\envskipamount
        !          2850: \removelastskip \penalty-50 \vskip\envskipamount \fi}}
        !          2851: 
        !          2852: \let\afterenvbreak = \aboveenvbreak
        !          2853: 
        !          2854: % \nonarrowing is a flag.  If "set", @lisp etc don't narrow margins.
        !          2855: \let\nonarrowing=\relax
        !          2856: 
        !          2857: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        !          2858: % \cartouche: draw rectangle w/rounded corners around argument
        !          2859: \font\circle=lcircle10
        !          2860: \newdimen\circthick
        !          2861: \newdimen\cartouter\newdimen\cartinner
        !          2862: \newskip\normbskip\newskip\normpskip\newskip\normlskip
        !          2863: \circthick=\fontdimen8\circle
        !          2864: %
        !          2865: \def\ctl{{\circle\char'013\hskip -6pt}}% 6pt from pl file: 1/2charwidth
        !          2866: \def\ctr{{\hskip 6pt\circle\char'010}}
        !          2867: \def\cbl{{\circle\char'012\hskip -6pt}}
        !          2868: \def\cbr{{\hskip 6pt\circle\char'011}}
        !          2869: \def\carttop{\hbox to \cartouter{\hskip\lskip
        !          2870:        \ctl\leaders\hrule height\circthick\hfil\ctr
        !          2871:        \hskip\rskip}}
        !          2872: \def\cartbot{\hbox to \cartouter{\hskip\lskip
        !          2873:        \cbl\leaders\hrule height\circthick\hfil\cbr
        !          2874:        \hskip\rskip}}
        !          2875: %
        !          2876: \newskip\lskip\newskip\rskip
        !          2877: 
        !          2878: \long\def\cartouche{%
        !          2879: \begingroup
        !          2880:        \lskip=\leftskip \rskip=\rightskip
        !          2881:        \leftskip=0pt\rightskip=0pt %we want these *outside*.
        !          2882:        \cartinner=\hsize \advance\cartinner by-\lskip
        !          2883:                          \advance\cartinner by-\rskip
        !          2884:        \cartouter=\hsize
        !          2885:        \advance\cartouter by 18pt % allow for 3pt kerns on either
        !          2886: %                                   side, and for 6pt waste from
        !          2887: %                                   each corner char
        !          2888:        \normbskip=\baselineskip \normpskip=\parskip \normlskip=\lineskip
        !          2889:        % Flag to tell @lisp, etc., not to narrow margin.
        !          2890:        \let\nonarrowing=\comment
        !          2891:        \vbox\bgroup
        !          2892:                \baselineskip=0pt\parskip=0pt\lineskip=0pt
        !          2893:                \carttop
        !          2894:                \hbox\bgroup
        !          2895:                        \hskip\lskip
        !          2896:                        \vrule\kern3pt
        !          2897:                        \vbox\bgroup
        !          2898:                                \hsize=\cartinner
        !          2899:                                \kern3pt
        !          2900:                                \begingroup
        !          2901:                                        \baselineskip=\normbskip
        !          2902:                                        \lineskip=\normlskip
        !          2903:                                        \parskip=\normpskip
        !          2904:                                        \vskip -\parskip
        !          2905: \def\Ecartouche{%
        !          2906:                                \endgroup
        !          2907:                                \kern3pt
        !          2908:                        \egroup
        !          2909:                        \kern3pt\vrule
        !          2910:                        \hskip\rskip
        !          2911:                \egroup
        !          2912:                \cartbot
        !          2913:        \egroup
        !          2914: \endgroup
        !          2915: }}
        !          2916: 
        !          2917: 
        !          2918: % This macro is called at the beginning of all the @example variants,
        !          2919: % inside a group.
        !          2920: \def\nonfillstart{%
        !          2921:   \aboveenvbreak
        !          2922:   \inENV % This group ends at the end of the body
        !          2923:   \hfuzz = 12pt % Don't be fussy
        !          2924:   \sepspaces % Make spaces be word-separators rather than space tokens.
        !          2925:   \singlespace
        !          2926:   \let\par = \lisppar % don't ignore blank lines
        !          2927:   \obeylines % each line of input is a line of output
        !          2928:   \parskip = 0pt
        !          2929:   \parindent = 0pt
        !          2930:   \emergencystretch = 0pt % don't try to avoid overfull boxes
        !          2931:   % @cartouche defines \nonarrowing to inhibit narrowing
        !          2932:   % at next level down.
        !          2933:   \ifx\nonarrowing\relax
        !          2934:     \advance \leftskip by \lispnarrowing
        !          2935:     \exdentamount=\lispnarrowing
        !          2936:     \let\exdent=\nofillexdent
        !          2937:     \let\nonarrowing=\relax
        !          2938:   \fi
        !          2939: }
        !          2940: 
        !          2941: % To ending an @example-like environment, we first end the paragraph
        !          2942: % (via \afterenvbreak's vertical glue), and then the group.  That way we
        !          2943: % keep the zero \parskip that the environments set -- \parskip glue
        !          2944: % will be inserted at the beginning of the next paragraph in the
        !          2945: % document, after the environment.
        !          2946: %
        !          2947: \def\nonfillfinish{\afterenvbreak\endgroup}%
        !          2948: 
        !          2949: % This macro is
        !          2950: \def\lisp{\begingroup
        !          2951:   \nonfillstart
        !          2952:   \let\Elisp = \nonfillfinish
        !          2953:   \tt
        !          2954:   \rawbackslash % have \ input char produce \ char from current font
        !          2955:   \gobble
        !          2956: }
        !          2957: 
        !          2958: % Define the \E... control sequence only if we are inside the
        !          2959: % environment, so the error checking in \end will work.
        !          2960: %
        !          2961: % We must call \lisp last in the definition, since it reads the
        !          2962: % return following the @example (or whatever) command.
        !          2963: %
        !          2964: \def\example{\begingroup \def\Eexample{\nonfillfinish\endgroup}\lisp}
        !          2965: \def\smallexample{\begingroup \def\Esmallexample{\nonfillfinish\endgroup}\lisp}
        !          2966: \def\smalllisp{\begingroup \def\Esmalllisp{\nonfillfinish\endgroup}\lisp}
        !          2967: 
        !          2968: % @smallexample and @smalllisp.  This is not used unless the @smallbook
        !          2969: % command is given.  Originally contributed by Pavel@xerox.
        !          2970: %
        !          2971: \def\smalllispx{\begingroup
        !          2972:   \nonfillstart
        !          2973:   \let\Esmalllisp = \nonfillfinish
        !          2974:   \let\Esmallexample = \nonfillfinish
        !          2975:   %
        !          2976:   % Smaller interline space and fonts for small examples.
        !          2977:   \baselineskip 10pt
        !          2978:   \indexfonts \tt
        !          2979:   \rawbackslash % output the \ character from the current font
        !          2980:   \gobble
        !          2981: }
        !          2982: 
        !          2983: % This is @display; same as @lisp except use roman font.
        !          2984: %
        !          2985: \def\display{\begingroup
        !          2986:   \nonfillstart
        !          2987:   \let\Edisplay = \nonfillfinish
        !          2988:   \gobble
        !          2989: }
        !          2990: 
        !          2991: % This is @format; same as @display except don't narrow margins.
        !          2992: %
        !          2993: \def\format{\begingroup
        !          2994:   \let\nonarrowing = t
        !          2995:   \nonfillstart
        !          2996:   \let\Eformat = \nonfillfinish
        !          2997:   \gobble
        !          2998: }
        !          2999: 
        !          3000: % @flushleft (same as @format) and @flushright.
        !          3001: %
        !          3002: \def\flushleft{\begingroup
        !          3003:   \let\nonarrowing = t
        !          3004:   \nonfillstart
        !          3005:   \let\Eflushleft = \nonfillfinish
        !          3006:   \gobble
        !          3007: }
        !          3008: \def\flushright{\begingroup
        !          3009:   \let\nonarrowing = t
        !          3010:   \nonfillstart
        !          3011:   \let\Eflushright = \nonfillfinish
        !          3012:   \advance\leftskip by 0pt plus 1fill
        !          3013:   \gobble}
        !          3014: 
        !          3015: % @quotation does normal linebreaking and narrows the margins.
        !          3016: %
        !          3017: \def\quotation{%
        !          3018: \begingroup\inENV %This group ends at the end of the @quotation body
        !          3019: {\parskip=0pt  % because we will skip by \parskip too, later
        !          3020: \aboveenvbreak}%
        !          3021: \singlespace
        !          3022: \parindent=0pt
        !          3023: \let\Equotation = \nonfillfinish
        !          3024: % @cartouche defines \nonarrowing to inhibit narrowing
        !          3025: % at next level down.
        !          3026: \ifx\nonarrowing\relax
        !          3027: \advance \leftskip by \lispnarrowing
        !          3028: \advance \rightskip by \lispnarrowing
        !          3029: \exdentamount=\lispnarrowing
        !          3030: \let\nonarrowing=\relax
        !          3031: \fi}
        !          3032: 
        !          3033: \message{defuns,}
        !          3034: % Define formatter for defuns
        !          3035: % First, allow user to change definition object font (\df) internally
        !          3036: \def\setdeffont #1 {\csname DEF#1\endcsname}
        !          3037: 
        !          3038: \newskip\defbodyindent \defbodyindent=.4in
        !          3039: \newskip\defargsindent \defargsindent=50pt
        !          3040: \newskip\deftypemargin \deftypemargin=12pt
        !          3041: \newskip\deflastargmargin \deflastargmargin=18pt
        !          3042: 
        !          3043: \newcount\parencount
        !          3044: % define \functionparens, which makes ( and ) and & do special things.
        !          3045: % \functionparens affects the group it is contained in.
        !          3046: \def\activeparens{%
        !          3047: \catcode`\(=\active \catcode`\)=\active \catcode`\&=\active
        !          3048: \catcode`\[=\active \catcode`\]=\active}
        !          3049: 
        !          3050: % Make control sequences which act like normal parenthesis chars.
        !          3051: \let\lparen = ( \let\rparen = )
        !          3052: 
        !          3053: {\activeparens % Now, smart parens don't turn on until &foo (see \amprm)
        !          3054: 
        !          3055: % Be sure that we always have a definition for `(', etc.  For example,
        !          3056: % if the fn name has parens in it, \boldbrax will not be in effect yet,
        !          3057: % so TeX would otherwise complain about undefined control sequence.
        !          3058: \global\let(=\lparen \global\let)=\rparen
        !          3059: \global\let[=\lbrack \global\let]=\rbrack
        !          3060: 
        !          3061: \gdef\functionparens{\boldbrax\let&=\amprm\parencount=0 }
        !          3062: \gdef\boldbrax{\let(=\opnr\let)=\clnr\let[=\lbrb\let]=\rbrb}
        !          3063: 
        !          3064: % Definitions of (, ) and & used in args for functions.
        !          3065: % This is the definition of ( outside of all parentheses.
        !          3066: \gdef\oprm#1 {{\rm\char`\(}#1 \bf \let(=\opnested %
        !          3067: \global\advance\parencount by 1 }
        !          3068: %
        !          3069: % This is the definition of ( when already inside a level of parens.
        !          3070: \gdef\opnested{\char`\(\global\advance\parencount by 1 }
        !          3071: %
        !          3072: \gdef\clrm{% Print a paren in roman if it is taking us back to depth of 0.
        !          3073: % also in that case restore the outer-level definition of (.
        !          3074: \ifnum \parencount=1 {\rm \char `\)}\sl \let(=\oprm \else \char `\) \fi
        !          3075: \global\advance \parencount by -1 }
        !          3076: % If we encounter &foo, then turn on ()-hacking afterwards
        !          3077: \gdef\amprm#1 {{\rm\&#1}\let(=\oprm \let)=\clrm\ }
        !          3078: %
        !          3079: \gdef\normalparens{\boldbrax\let&=\ampnr}
        !          3080: } % End of definition inside \activeparens
        !          3081: %% These parens (in \boldbrax) actually are a little bolder than the
        !          3082: %% contained text.  This is especially needed for [ and ]
        !          3083: \def\opnr{{\sf\char`\(}} \def\clnr{{\sf\char`\)}} \def\ampnr{\&}
        !          3084: \def\lbrb{{\bf\char`\[}} \def\rbrb{{\bf\char`\]}}
        !          3085: 
        !          3086: % First, defname, which formats the header line itself.
        !          3087: % #1 should be the function name.
        !          3088: % #2 should be the type of definition, such as "Function".
        !          3089: 
        !          3090: \def\defname #1#2{%
        !          3091: % Get the values of \leftskip and \rightskip as they were
        !          3092: % outside the @def...
        !          3093: \dimen2=\leftskip
        !          3094: \advance\dimen2 by -\defbodyindent
        !          3095: \dimen3=\rightskip
        !          3096: \advance\dimen3 by -\defbodyindent
        !          3097: \noindent        %
        !          3098: \setbox0=\hbox{\hskip \deflastargmargin{\rm #2}\hskip \deftypemargin}%
        !          3099: \dimen0=\hsize \advance \dimen0 by -\wd0 % compute size for first line
        !          3100: \dimen1=\hsize \advance \dimen1 by -\defargsindent %size for continuations
        !          3101: \parshape 2 0in \dimen0 \defargsindent \dimen1     %
        !          3102: % Now output arg 2 ("Function" or some such)
        !          3103: % ending at \deftypemargin from the right margin,
        !          3104: % but stuck inside a box of width 0 so it does not interfere with linebreaking
        !          3105: {% Adjust \hsize to exclude the ambient margins,
        !          3106: % so that \rightline will obey them.
        !          3107: \advance \hsize by -\dimen2 \advance \hsize by -\dimen3
        !          3108: \rlap{\rightline{{\rm #2}\hskip \deftypemargin}}}%
        !          3109: % Make all lines underfull and no complaints:
        !          3110: \tolerance=10000 \hbadness=10000
        !          3111: \advance\leftskip by -\defbodyindent
        !          3112: \exdentamount=\defbodyindent
        !          3113: {\df #1}\enskip        % Generate function name
        !          3114: }
        !          3115: 
        !          3116: % Actually process the body of a definition
        !          3117: % #1 should be the terminating control sequence, such as \Edefun.
        !          3118: % #2 should be the "another name" control sequence, such as \defunx.
        !          3119: % #3 should be the control sequence that actually processes the header,
        !          3120: %    such as \defunheader.
        !          3121: 
        !          3122: \def\defparsebody #1#2#3{\begingroup\inENV% Environment for definitionbody
        !          3123: \medbreak %
        !          3124: % Define the end token that this defining construct specifies
        !          3125: % so that it will exit this group.
        !          3126: \def#1{\endgraf\endgroup\medbreak}%
        !          3127: \def#2{\begingroup\obeylines\activeparens\spacesplit#3}%
        !          3128: \parindent=0in
        !          3129: \advance\leftskip by \defbodyindent \advance \rightskip by \defbodyindent
        !          3130: \exdentamount=\defbodyindent
        !          3131: \begingroup %
        !          3132: \catcode 61=\active % 61 is `='
        !          3133: \obeylines\activeparens\spacesplit#3}
        !          3134: 
        !          3135: \def\defmethparsebody #1#2#3#4 {\begingroup\inENV %
        !          3136: \medbreak %
        !          3137: % Define the end token that this defining construct specifies
        !          3138: % so that it will exit this group.
        !          3139: \def#1{\endgraf\endgroup\medbreak}%
        !          3140: \def#2##1 {\begingroup\obeylines\activeparens\spacesplit{#3{##1}}}%
        !          3141: \parindent=0in
        !          3142: \advance\leftskip by \defbodyindent \advance \rightskip by \defbodyindent
        !          3143: \exdentamount=\defbodyindent
        !          3144: \begingroup\obeylines\activeparens\spacesplit{#3{#4}}}
        !          3145: 
        !          3146: \def\defopparsebody #1#2#3#4#5 {\begingroup\inENV %
        !          3147: \medbreak %
        !          3148: % Define the end token that this defining construct specifies
        !          3149: % so that it will exit this group.
        !          3150: \def#1{\endgraf\endgroup\medbreak}%
        !          3151: \def#2##1 ##2 {\def#4{##1}%
        !          3152: \begingroup\obeylines\activeparens\spacesplit{#3{##2}}}%
        !          3153: \parindent=0in
        !          3154: \advance\leftskip by \defbodyindent \advance \rightskip by \defbodyindent
        !          3155: \exdentamount=\defbodyindent
        !          3156: \begingroup\obeylines\activeparens\spacesplit{#3{#5}}}
        !          3157: 
        !          3158: % These parsing functions are similar to the preceding ones
        !          3159: % except that they do not make parens into active characters.
        !          3160: % These are used for "variables" since they have no arguments.
        !          3161: 
        !          3162: \def\defvarparsebody #1#2#3{\begingroup\inENV% Environment for definitionbody
        !          3163: \medbreak %
        !          3164: % Define the end token that this defining construct specifies
        !          3165: % so that it will exit this group.
        !          3166: \def#1{\endgraf\endgroup\medbreak}%
        !          3167: \def#2{\begingroup\obeylines\spacesplit#3}%
        !          3168: \parindent=0in
        !          3169: \advance\leftskip by \defbodyindent \advance \rightskip by \defbodyindent
        !          3170: \exdentamount=\defbodyindent
        !          3171: \begingroup %
        !          3172: \catcode 61=\active %
        !          3173: \obeylines\spacesplit#3}
        !          3174: 
        !          3175: % This is used for \def{tp,vr}parsebody.  It could probably be used for
        !          3176: % some of the others, too, with some judicious conditionals.
        !          3177: % 
        !          3178: \def\parsebodycommon#1#2#3{%
        !          3179:   \begingroup\inENV %
        !          3180:   \medbreak %
        !          3181:   % Define the end token that this defining construct specifies
        !          3182:   % so that it will exit this group.
        !          3183:   \def#1{\endgraf\endgroup\medbreak}%
        !          3184:   \def#2##1 {\begingroup\obeylines\spacesplit{#3{##1}}}%
        !          3185:   \parindent=0in
        !          3186:   \advance\leftskip by \defbodyindent \advance \rightskip by \defbodyindent
        !          3187:   \exdentamount=\defbodyindent
        !          3188:   \begingroup\obeylines
        !          3189: }
        !          3190: 
        !          3191: \def\defvrparsebody#1#2#3#4 {%
        !          3192:   \parsebodycommon{#1}{#2}{#3}%
        !          3193:   \spacesplit{#3{#4}}%
        !          3194: }
        !          3195: 
        !          3196: % This loses on `@deftp {Data Type} {struct termios}' -- it thinks the
        !          3197: % type is just `struct', because we lose the braces in `{struct
        !          3198: % termios}' when \spacesplit reads its undelimited argument.  Sigh.
        !          3199: % \let\deftpparsebody=\defvrparsebody
        !          3200: %
        !          3201: % So, to get around this, we put \empty in with the type name.  That
        !          3202: % way, TeX won't find exactly `{...}' as an undelimited argument, and
        !          3203: % won't strip off the braces.
        !          3204: %
        !          3205: \def\deftpparsebody #1#2#3#4 {%
        !          3206:   \parsebodycommon{#1}{#2}{#3}%
        !          3207:   \spacesplit{\parsetpheaderline{#3{#4}}}\empty
        !          3208: }
        !          3209: 
        !          3210: % Fine, but then we have to eventually remove the \empty *and* the
        !          3211: % braces (if any).  That's what this does, putting the result in \tptemp.
        !          3212: % 
        !          3213: \def\removeemptybraces\empty#1\relax{\def\tptemp{#1}}%
        !          3214: 
        !          3215: % After \spacesplit has done its work, this is called -- #1 is the final
        !          3216: % thing to call, #2 the type name (which starts with \empty), and #3
        !          3217: % (which might be empty) the arguments.
        !          3218: % 
        !          3219: \def\parsetpheaderline#1#2#3{%
        !          3220:   \removeemptybraces#2\relax
        !          3221:   #1{\tptemp}{#3}%
        !          3222: }%
        !          3223: 
        !          3224: \def\defopvarparsebody #1#2#3#4#5 {\begingroup\inENV %
        !          3225: \medbreak %
        !          3226: % Define the end token that this defining construct specifies
        !          3227: % so that it will exit this group.
        !          3228: \def#1{\endgraf\endgroup\medbreak}%
        !          3229: \def#2##1 ##2 {\def#4{##1}%
        !          3230: \begingroup\obeylines\spacesplit{#3{##2}}}%
        !          3231: \parindent=0in
        !          3232: \advance\leftskip by \defbodyindent \advance \rightskip by \defbodyindent
        !          3233: \exdentamount=\defbodyindent
        !          3234: \begingroup\obeylines\spacesplit{#3{#5}}}
        !          3235: 
        !          3236: % Split up #2 at the first space token.
        !          3237: % call #1 with two arguments:
        !          3238: %  the first is all of #2 before the space token,
        !          3239: %  the second is all of #2 after that space token.
        !          3240: % If #2 contains no space token, all of it is passed as the first arg
        !          3241: % and the second is passed as empty.
        !          3242: 
        !          3243: {\obeylines
        !          3244: \gdef\spacesplit#1#2^^M{\endgroup\spacesplitfoo{#1}#2 \relax\spacesplitfoo}%
        !          3245: \long\gdef\spacesplitfoo#1#2 #3#4\spacesplitfoo{%
        !          3246: \ifx\relax #3%
        !          3247: #1{#2}{}\else #1{#2}{#3#4}\fi}}
        !          3248: 
        !          3249: % So much for the things common to all kinds of definitions.
        !          3250: 
        !          3251: % Define @defun.
        !          3252: 
        !          3253: % First, define the processing that is wanted for arguments of \defun
        !          3254: % Use this to expand the args and terminate the paragraph they make up
        !          3255: 
        !          3256: \def\defunargs #1{\functionparens \sl
        !          3257: % Expand, preventing hyphenation at `-' chars.
        !          3258: % Note that groups don't affect changes in \hyphenchar.
        !          3259: \hyphenchar\tensl=0
        !          3260: #1%
        !          3261: \hyphenchar\tensl=45
        !          3262: \ifnum\parencount=0 \else \errmessage{unbalanced parens in @def arguments}\fi%
        !          3263: \interlinepenalty=10000
        !          3264: \advance\rightskip by 0pt plus 1fil
        !          3265: \endgraf\penalty 10000\vskip -\parskip\penalty 10000%
        !          3266: }
        !          3267: 
        !          3268: \def\deftypefunargs #1{%
        !          3269: % Expand, preventing hyphenation at `-' chars.
        !          3270: % Note that groups don't affect changes in \hyphenchar.
        !          3271: \functionparens
        !          3272: \code{#1}%
        !          3273: \interlinepenalty=10000
        !          3274: \advance\rightskip by 0pt plus 1fil
        !          3275: \endgraf\penalty 10000\vskip -\parskip\penalty 10000%
        !          3276: }
        !          3277: 
        !          3278: % Do complete processing of one @defun or @defunx line already parsed.
        !          3279: 
        !          3280: % @deffn Command forward-char nchars
        !          3281: 
        !          3282: \def\deffn{\defmethparsebody\Edeffn\deffnx\deffnheader}
        !          3283: 
        !          3284: \def\deffnheader #1#2#3{\doind {fn}{\code{#2}}%
        !          3285: \begingroup\defname {#2}{#1}\defunargs{#3}\endgroup %
        !          3286: \catcode 61=\other % Turn off change made in \defparsebody
        !          3287: }
        !          3288: 
        !          3289: % @defun == @deffn Function
        !          3290: 
        !          3291: \def\defun{\defparsebody\Edefun\defunx\defunheader}
        !          3292: 
        !          3293: \def\defunheader #1#2{\doind {fn}{\code{#1}}% Make entry in function index
        !          3294: \begingroup\defname {#1}{Function}%
        !          3295: \defunargs {#2}\endgroup %
        !          3296: \catcode 61=\other % Turn off change made in \defparsebody
        !          3297: }
        !          3298: 
        !          3299: % @deftypefun int foobar (int @var{foo}, float @var{bar})
        !          3300: 
        !          3301: \def\deftypefun{\defparsebody\Edeftypefun\deftypefunx\deftypefunheader}
        !          3302: 
        !          3303: % #1 is the data type.  #2 is the name and args.
        !          3304: \def\deftypefunheader #1#2{\deftypefunheaderx{#1}#2 \relax}
        !          3305: % #1 is the data type, #2 the name, #3 the args.
        !          3306: \def\deftypefunheaderx #1#2 #3\relax{%
        !          3307: \doind {fn}{\code{#2}}% Make entry in function index
        !          3308: \begingroup\defname {\code{#1} #2}{Function}%
        !          3309: \deftypefunargs {#3}\endgroup %
        !          3310: \catcode 61=\other % Turn off change made in \defparsebody
        !          3311: }
        !          3312: 
        !          3313: % @deftypefn {Library Function} int foobar (int @var{foo}, float @var{bar})
        !          3314: 
        !          3315: \def\deftypefn{\defmethparsebody\Edeftypefn\deftypefnx\deftypefnheader}
        !          3316: 
        !          3317: % #1 is the classification.  #2 is the data type.  #3 is the name and args.
        !          3318: \def\deftypefnheader #1#2#3{\deftypefnheaderx{#1}{#2}#3 \relax}
        !          3319: % #1 is the classification, #2 the data type, #3 the name, #4 the args.
        !          3320: \def\deftypefnheaderx #1#2#3 #4\relax{%
        !          3321: \doind {fn}{\code{#3}}% Make entry in function index
        !          3322: \begingroup
        !          3323: \normalparens % notably, turn off `&' magic, which prevents
        !          3324: %               at least some C++ text from working
        !          3325: \defname {\code{#2} #3}{#1}%
        !          3326: \deftypefunargs {#4}\endgroup %
        !          3327: \catcode 61=\other % Turn off change made in \defparsebody
        !          3328: }
        !          3329: 
        !          3330: % @defmac == @deffn Macro
        !          3331: 
        !          3332: \def\defmac{\defparsebody\Edefmac\defmacx\defmacheader}
        !          3333: 
        !          3334: \def\defmacheader #1#2{\doind {fn}{\code{#1}}% Make entry in function index
        !          3335: \begingroup\defname {#1}{Macro}%
        !          3336: \defunargs {#2}\endgroup %
        !          3337: \catcode 61=\other % Turn off change made in \defparsebody
        !          3338: }
        !          3339: 
        !          3340: % @defspec == @deffn Special Form
        !          3341: 
        !          3342: \def\defspec{\defparsebody\Edefspec\defspecx\defspecheader}
        !          3343: 
        !          3344: \def\defspecheader #1#2{\doind {fn}{\code{#1}}% Make entry in function index
        !          3345: \begingroup\defname {#1}{Special Form}%
        !          3346: \defunargs {#2}\endgroup %
        !          3347: \catcode 61=\other % Turn off change made in \defparsebody
        !          3348: }
        !          3349: 
        !          3350: % This definition is run if you use @defunx
        !          3351: % anywhere other than immediately after a @defun or @defunx.
        !          3352: 
        !          3353: \def\deffnx #1 {\errmessage{@deffnx in invalid context}}
        !          3354: \def\defunx #1 {\errmessage{@defunx in invalid context}}
        !          3355: \def\defmacx #1 {\errmessage{@defmacx in invalid context}}
        !          3356: \def\defspecx #1 {\errmessage{@defspecx in invalid context}}
        !          3357: \def\deftypefnx #1 {\errmessage{@deftypefnx in invalid context}}
        !          3358: \def\deftypeunx #1 {\errmessage{@deftypeunx in invalid context}}
        !          3359: 
        !          3360: % @defmethod, and so on
        !          3361: 
        !          3362: % @defop {Funny Method} foo-class frobnicate argument
        !          3363: 
        !          3364: \def\defop #1 {\def\defoptype{#1}%
        !          3365: \defopparsebody\Edefop\defopx\defopheader\defoptype}
        !          3366: 
        !          3367: \def\defopheader #1#2#3{%
        !          3368: \dosubind {fn}{\code{#2}}{on #1}% Make entry in function index
        !          3369: \begingroup\defname {#2}{\defoptype{} on #1}%
        !          3370: \defunargs {#3}\endgroup %
        !          3371: }
        !          3372: 
        !          3373: % @defmethod == @defop Method
        !          3374: 
        !          3375: \def\defmethod{\defmethparsebody\Edefmethod\defmethodx\defmethodheader}
        !          3376: 
        !          3377: \def\defmethodheader #1#2#3{%
        !          3378: \dosubind {fn}{\code{#2}}{on #1}% entry in function index
        !          3379: \begingroup\defname {#2}{Method on #1}%
        !          3380: \defunargs {#3}\endgroup %
        !          3381: }
        !          3382: 
        !          3383: % @defcv {Class Option} foo-class foo-flag
        !          3384: 
        !          3385: \def\defcv #1 {\def\defcvtype{#1}%
        !          3386: \defopvarparsebody\Edefcv\defcvx\defcvarheader\defcvtype}
        !          3387: 
        !          3388: \def\defcvarheader #1#2#3{%
        !          3389: \dosubind {vr}{\code{#2}}{of #1}% Make entry in var index
        !          3390: \begingroup\defname {#2}{\defcvtype{} of #1}%
        !          3391: \defvarargs {#3}\endgroup %
        !          3392: }
        !          3393: 
        !          3394: % @defivar == @defcv {Instance Variable}
        !          3395: 
        !          3396: \def\defivar{\defvrparsebody\Edefivar\defivarx\defivarheader}
        !          3397: 
        !          3398: \def\defivarheader #1#2#3{%
        !          3399: \dosubind {vr}{\code{#2}}{of #1}% Make entry in var index
        !          3400: \begingroup\defname {#2}{Instance Variable of #1}%
        !          3401: \defvarargs {#3}\endgroup %
        !          3402: }
        !          3403: 
        !          3404: % These definitions are run if you use @defmethodx, etc.,
        !          3405: % anywhere other than immediately after a @defmethod, etc.
        !          3406: 
        !          3407: \def\defopx #1 {\errmessage{@defopx in invalid context}}
        !          3408: \def\defmethodx #1 {\errmessage{@defmethodx in invalid context}}
        !          3409: \def\defcvx #1 {\errmessage{@defcvx in invalid context}}
        !          3410: \def\defivarx #1 {\errmessage{@defivarx in invalid context}}
        !          3411: 
        !          3412: % Now @defvar
        !          3413: 
        !          3414: % First, define the processing that is wanted for arguments of @defvar.
        !          3415: % This is actually simple: just print them in roman.
        !          3416: % This must expand the args and terminate the paragraph they make up
        !          3417: \def\defvarargs #1{\normalparens #1%
        !          3418: \interlinepenalty=10000
        !          3419: \endgraf\penalty 10000\vskip -\parskip\penalty 10000}
        !          3420: 
        !          3421: % @defvr Counter foo-count
        !          3422: 
        !          3423: \def\defvr{\defvrparsebody\Edefvr\defvrx\defvrheader}
        !          3424: 
        !          3425: \def\defvrheader #1#2#3{\doind {vr}{\code{#2}}%
        !          3426: \begingroup\defname {#2}{#1}\defvarargs{#3}\endgroup}
        !          3427: 
        !          3428: % @defvar == @defvr Variable
        !          3429: 
        !          3430: \def\defvar{\defvarparsebody\Edefvar\defvarx\defvarheader}
        !          3431: 
        !          3432: \def\defvarheader #1#2{\doind {vr}{\code{#1}}% Make entry in var index
        !          3433: \begingroup\defname {#1}{Variable}%
        !          3434: \defvarargs {#2}\endgroup %
        !          3435: }
        !          3436: 
        !          3437: % @defopt == @defvr {User Option}
        !          3438: 
        !          3439: \def\defopt{\defvarparsebody\Edefopt\defoptx\defoptheader}
        !          3440: 
        !          3441: \def\defoptheader #1#2{\doind {vr}{\code{#1}}% Make entry in var index
        !          3442: \begingroup\defname {#1}{User Option}%
        !          3443: \defvarargs {#2}\endgroup %
        !          3444: }
        !          3445: 
        !          3446: % @deftypevar int foobar
        !          3447: 
        !          3448: \def\deftypevar{\defvarparsebody\Edeftypevar\deftypevarx\deftypevarheader}
        !          3449: 
        !          3450: % #1 is the data type.  #2 is the name.
        !          3451: \def\deftypevarheader #1#2{%
        !          3452: \doind {vr}{\code{#2}}% Make entry in variables index
        !          3453: \begingroup\defname {\code{#1} #2}{Variable}%
        !          3454: \interlinepenalty=10000
        !          3455: \endgraf\penalty 10000\vskip -\parskip\penalty 10000
        !          3456: \endgroup}
        !          3457: 
        !          3458: % @deftypevr {Global Flag} int enable
        !          3459: 
        !          3460: \def\deftypevr{\defvrparsebody\Edeftypevr\deftypevrx\deftypevrheader}
        !          3461: 
        !          3462: \def\deftypevrheader #1#2#3{\doind {vr}{\code{#3}}%
        !          3463: \begingroup\defname {\code{#2} #3}{#1}
        !          3464: \interlinepenalty=10000
        !          3465: \endgraf\penalty 10000\vskip -\parskip\penalty 10000
        !          3466: \endgroup}
        !          3467: 
        !          3468: % This definition is run if you use @defvarx
        !          3469: % anywhere other than immediately after a @defvar or @defvarx.
        !          3470: 
        !          3471: \def\defvrx #1 {\errmessage{@defvrx in invalid context}}
        !          3472: \def\defvarx #1 {\errmessage{@defvarx in invalid context}}
        !          3473: \def\defoptx #1 {\errmessage{@defoptx in invalid context}}
        !          3474: \def\deftypevarx #1 {\errmessage{@deftypevarx in invalid context}}
        !          3475: \def\deftypevrx #1 {\errmessage{@deftypevrx in invalid context}}
        !          3476: 
        !          3477: % Now define @deftp
        !          3478: % Args are printed in bold, a slight difference from @defvar.
        !          3479: 
        !          3480: \def\deftpargs #1{\bf \defvarargs{#1}}
        !          3481: 
        !          3482: % @deftp Class window height width ...
        !          3483: 
        !          3484: \def\deftp{\deftpparsebody\Edeftp\deftpx\deftpheader}
        !          3485: 
        !          3486: \def\deftpheader #1#2#3{\doind {tp}{\code{#2}}%
        !          3487: \begingroup\defname {#2}{#1}\deftpargs{#3}\endgroup}
        !          3488: 
        !          3489: % This definition is run if you use @deftpx, etc
        !          3490: % anywhere other than immediately after a @deftp, etc.
        !          3491: 
        !          3492: \def\deftpx #1 {\errmessage{@deftpx in invalid context}}
        !          3493: 
        !          3494: \message{cross reference,}
        !          3495: % Define cross-reference macros
        !          3496: \newwrite \auxfile
        !          3497: 
        !          3498: \newif\ifhavexrefs  % True if xref values are known.
        !          3499: \newif\ifwarnedxrefs  % True if we warned once that they aren't known.
        !          3500: 
        !          3501: % \setref{foo} defines a cross-reference point named foo.
        !          3502: 
        !          3503: \def\setref#1{%
        !          3504: \dosetq{#1-title}{Ytitle}%
        !          3505: \dosetq{#1-pg}{Ypagenumber}%
        !          3506: \dosetq{#1-snt}{Ysectionnumberandtype}}
        !          3507: 
        !          3508: \def\unnumbsetref#1{%
        !          3509: \dosetq{#1-title}{Ytitle}%
        !          3510: \dosetq{#1-pg}{Ypagenumber}%
        !          3511: \dosetq{#1-snt}{Ynothing}}
        !          3512: 
        !          3513: \def\appendixsetref#1{%
        !          3514: \dosetq{#1-title}{Ytitle}%
        !          3515: \dosetq{#1-pg}{Ypagenumber}%
        !          3516: \dosetq{#1-snt}{Yappendixletterandtype}}
        !          3517: 
        !          3518: % \xref, \pxref, and \ref generate cross-references to specified points.
        !          3519: % For \xrefX, #1 is the node name, #2 the name of the Info
        !          3520: % cross-reference, #3 the printed node name, #4 the name of the Info
        !          3521: % file, #5 the name of the printed manual.  All but the node name can be
        !          3522: % omitted.
        !          3523: %
        !          3524: \def\pxref#1{see \xrefX[#1,,,,,,,]}
        !          3525: \def\xref#1{See \xrefX[#1,,,,,,,]}
        !          3526: \def\ref#1{\xrefX[#1,,,,,,,]}
        !          3527: \def\xrefX[#1,#2,#3,#4,#5,#6]{\begingroup%
        !          3528: \def\printedmanual{\ignorespaces #5}%
        !          3529: \def\printednodename{\ignorespaces #3}%
        !          3530: %
        !          3531: \setbox1=\hbox{\printedmanual}%
        !          3532: \setbox0=\hbox{\printednodename}%
        !          3533: \ifdim \wd0=0pt%
        !          3534: % No printed node name was explicitly given.
        !          3535: \ifx SETxref-automatic-section-title %
        !          3536: % This line should make the actual chapter or section title appear inside
        !          3537: % the square brackets.  Use the real section title if we have it.
        !          3538: \ifdim \wd1>0pt%
        !          3539: % It is in another manual, so we don't have it.
        !          3540: \def\printednodename{\ignorespaces #1} \else%
        !          3541: % We know the real title if we have the xref values.
        !          3542: \ifhavexrefs \def\printednodename{\refx{#1-title}}%
        !          3543: % Otherwise just copy the Info node name.
        !          3544: \else \def\printednodename{\ignorespaces #1} \fi%
        !          3545: \fi\def\printednodename{#1-title}%
        !          3546: \else% This line just uses the node name.
        !          3547: \def\printednodename{\ignorespaces #1}%
        !          3548: \fi% ends \ifx SETxref-automatic-section-title
        !          3549: \fi% ends \ifdim \wd0
        !          3550: %
        !          3551: %
        !          3552: % If we use \unhbox0 and \unhbox1 to print the node names, TeX does
        !          3553: % not insert empty discretionaries after hyphens, which means that it
        !          3554: % will not find a line break at a hyphen in a node names.  Since some
        !          3555: % manuals are best written with fairly long node names, containing
        !          3556: % hyphens, this is a loss.  Therefore, we simply give the text of
        !          3557: % the node name again, so it is as if TeX is seeing it for the first
        !          3558: % time.
        !          3559: \ifdim \wd1>0pt
        !          3560: section ``\printednodename'' in \cite{\printedmanual}%
        !          3561: \else%
        !          3562: \turnoffactive%
        !          3563: \refx{#1-snt}{} [\printednodename], page\tie\refx{#1-pg}{}%
        !          3564: \fi
        !          3565: \endgroup}
        !          3566: 
        !          3567: % \dosetq is the interface for calls from other macros
        !          3568: 
        !          3569: % Use \turnoffactive so that punctuation chars such as underscore
        !          3570: % work in node names.
        !          3571: \def\dosetq #1#2{{\let\folio=0 \turnoffactive%
        !          3572: \edef\next{\write\auxfile{\internalsetq {#1}{#2}}}%
        !          3573: \next}}
        !          3574: 
        !          3575: % \internalsetq {foo}{page} expands into
        !          3576: % CHARACTERS 'xrdef {foo}{...expansion of \Ypage...}
        !          3577: % When the aux file is read, ' is the escape character
        !          3578: 
        !          3579: \def\internalsetq #1#2{'xrdef {#1}{\csname #2\endcsname}}
        !          3580: 
        !          3581: % Things to be expanded by \internalsetq
        !          3582: 
        !          3583: \def\Ypagenumber{\folio}
        !          3584: 
        !          3585: \def\Ytitle{\thissection}
        !          3586: 
        !          3587: \def\Ynothing{}
        !          3588: 
        !          3589: \def\Ysectionnumberandtype{%
        !          3590: \ifnum\secno=0 Chapter\xreftie\the\chapno %
        !          3591: \else \ifnum \subsecno=0 Section\xreftie\the\chapno.\the\secno %
        !          3592: \else \ifnum \subsubsecno=0 %
        !          3593: Section\xreftie\the\chapno.\the\secno.\the\subsecno %
        !          3594: \else %
        !          3595: Section\xreftie\the\chapno.\the\secno.\the\subsecno.\the\subsubsecno %
        !          3596: \fi \fi \fi }
        !          3597: 
        !          3598: \def\Yappendixletterandtype{%
        !          3599: \ifnum\secno=0 Appendix\xreftie'char\the\appendixno{}%
        !          3600: \else \ifnum \subsecno=0 Section\xreftie'char\the\appendixno.\the\secno %
        !          3601: \else \ifnum \subsubsecno=0 %
        !          3602: Section\xreftie'char\the\appendixno.\the\secno.\the\subsecno %
        !          3603: \else %
        !          3604: Section\xreftie'char\the\appendixno.\the\secno.\the\subsecno.\the\subsubsecno %
        !          3605: \fi \fi \fi }
        !          3606: 
        !          3607: \gdef\xreftie{'tie}
        !          3608: 
        !          3609: % Use TeX 3.0's \inputlineno to get the line number, for better error
        !          3610: % messages, but if we're using an old version of TeX, don't do anything.
        !          3611: %
        !          3612: \ifx\inputlineno\thisisundefined
        !          3613:   \let\linenumber = \empty % Non-3.0.
        !          3614: \else
        !          3615:   \def\linenumber{\the\inputlineno:\space}
        !          3616: \fi
        !          3617: 
        !          3618: % Define \refx{NAME}{SUFFIX} to reference a cross-reference string named NAME.
        !          3619: % If its value is nonempty, SUFFIX is output afterward.
        !          3620: 
        !          3621: \def\refx#1#2{%
        !          3622:   \expandafter\ifx\csname X#1\endcsname\relax
        !          3623:     % If not defined, say something at least.
        !          3624:     $\langle$un\-de\-fined$\rangle$%
        !          3625:     \ifhavexrefs
        !          3626:       \message{\linenumber Undefined cross reference `#1'.}%
        !          3627:     \else
        !          3628:       \ifwarnedxrefs\else
        !          3629:         \global\warnedxrefstrue
        !          3630:         \message{Cross reference values unknown; you must run TeX again.}%
        !          3631:       \fi
        !          3632:     \fi
        !          3633:   \else
        !          3634:     % It's defined, so just use it.
        !          3635:     \csname X#1\endcsname
        !          3636:   \fi
        !          3637:   #2% Output the suffix in any case.
        !          3638: }
        !          3639: 
        !          3640: % Read the last existing aux file, if any.  No error if none exists.
        !          3641: 
        !          3642: % This is the macro invoked by entries in the aux file.
        !          3643: \def\xrdef #1#2{
        !          3644: {\catcode`\'=\other\expandafter \gdef \csname X#1\endcsname {#2}}}
        !          3645: 
        !          3646: \def\readauxfile{%
        !          3647: \begingroup
        !          3648: \catcode `\^^@=\other
        !          3649: \catcode `\&=\other
        !          3650: \catcode `\=\other
        !          3651: \catcode `\^^C=\other
        !          3652: \catcode `\^^D=\other
        !          3653: \catcode `\^^E=\other
        !          3654: \catcode `\^^F=\other
        !          3655: \catcode `\^^G=\other
        !          3656: \catcode `\^^H=\other
        !          3657: \catcode `\=\other
        !          3658: \catcode `\^^L=\other
        !          3659: \catcode `\=\other
        !          3660: \catcode `\=\other
        !          3661: \catcode `\=\other
        !          3662: \catcode `\=\other
        !          3663: \catcode `\=\other
        !          3664: \catcode `\=\other
        !          3665: \catcode `\=\other
        !          3666: \catcode `\=\other
        !          3667: \catcode `\=\other
        !          3668: \catcode `\=\other
        !          3669: \catcode `\=\other
        !          3670: \catcode `\=\other
        !          3671: \catcode 26=\other
        !          3672: \catcode `\^^[=\other
        !          3673: \catcode `\^^\=\other
        !          3674: \catcode `\^^]=\other
        !          3675: \catcode `\^^^=\other
        !          3676: \catcode `\^^_=\other
        !          3677: \catcode `\@=\other
        !          3678: \catcode `\^=\other
        !          3679: \catcode `\~=\other
        !          3680: \catcode `\[=\other
        !          3681: \catcode `\]=\other
        !          3682: \catcode`\"=\other
        !          3683: \catcode`\_=\other
        !          3684: \catcode`\|=\other
        !          3685: \catcode`\<=\other
        !          3686: \catcode`\>=\other
        !          3687: \catcode `\$=\other
        !          3688: \catcode `\#=\other
        !          3689: \catcode `\&=\other
        !          3690: % `\+ does not work, so use 43.
        !          3691: \catcode 43=\other
        !          3692: % the aux file uses ' as the escape.
        !          3693: % Turn off \ as an escape so we do not lose on
        !          3694: % entries which were dumped with control sequences in their names.
        !          3695: % For example, 'xrdef {$\leq $-fun}{page ...} made by @defun ^^
        !          3696: % Reference to such entries still does not work the way one would wish,
        !          3697: % but at least they do not bomb out when the aux file is read in.
        !          3698: \catcode `\{=1 \catcode `\}=2
        !          3699: \catcode `\%=\other
        !          3700: \catcode `\'=0
        !          3701: \catcode `\\=\other
        !          3702: \openin 1 \jobname.aux
        !          3703: \ifeof 1 \else \closein 1 \input \jobname.aux \global\havexrefstrue
        !          3704: \global\warnedobstrue
        !          3705: \fi
        !          3706: % Open the new aux file.  Tex will close it automatically at exit.
        !          3707: \openout \auxfile=\jobname.aux
        !          3708: \endgroup}
        !          3709: 
        !          3710: 
        !          3711: % Footnotes.
        !          3712: 
        !          3713: \newcount \footnoteno
        !          3714: 
        !          3715: % The trailing space in the following definition for supereject is
        !          3716: % vital for proper filling; pages come out unaligned when you do a
        !          3717: % pagealignmacro call if that space before the closing brace is
        !          3718: % removed.
        !          3719: \def\supereject{\par\penalty -20000\footnoteno =0 }
        !          3720: 
        !          3721: % @footnotestyle is meaningful for info output only..
        !          3722: \let\footnotestyle=\comment
        !          3723: 
        !          3724: \let\ptexfootnote=\footnote
        !          3725: 
        !          3726: {\catcode `\@=11
        !          3727: %
        !          3728: % Auto-number footnotes.  Otherwise like plain.
        !          3729: \gdef\footnote{%
        !          3730:   \global\advance\footnoteno by \@ne
        !          3731:   \edef\thisfootno{$^{\the\footnoteno}$}%
        !          3732:   %
        !          3733:   % In case the footnote comes at the end of a sentence, preserve the
        !          3734:   % extra spacing after we do the footnote number.
        !          3735:   \let\@sf\empty
        !          3736:   \ifhmode\edef\@sf{\spacefactor\the\spacefactor}\/\fi
        !          3737:   %
        !          3738:   % Remove inadvertent blank space before typesetting the footnote number.
        !          3739:   \unskip
        !          3740:   \thisfootno\@sf
        !          3741:   \footnotezzz
        !          3742: }%
        !          3743: 
        !          3744: % Don't bother with the trickery in plain.tex to not require the
        !          3745: % footnote text as a parameter.  Our footnotes don't need to be so general.
        !          3746: %
        !          3747: \long\gdef\footnotezzz#1{\insert\footins{%
        !          3748:   % We want to typeset this text as a normal paragraph, even if the
        !          3749:   % footnote reference occurs in (for example) a display environment.
        !          3750:   % So reset some parameters.
        !          3751:   \interlinepenalty\interfootnotelinepenalty
        !          3752:   \splittopskip\ht\strutbox % top baseline for broken footnotes
        !          3753:   \splitmaxdepth\dp\strutbox
        !          3754:   \floatingpenalty\@MM
        !          3755:   \leftskip\z@skip
        !          3756:   \rightskip\z@skip
        !          3757:   \spaceskip\z@skip
        !          3758:   \xspaceskip\z@skip
        !          3759:   \parindent\defaultparindent
        !          3760:   %
        !          3761:   % Hang the footnote text off the number.
        !          3762:   \hang
        !          3763:   \textindent{\thisfootno}%
        !          3764:   %
        !          3765:   % Don't crash into the line above the footnote text.  Since this
        !          3766:   % expands into a box, it must come within the paragraph, lest it
        !          3767:   % provide a place where TeX can split the footnote.
        !          3768:   \footstrut
        !          3769:   #1\strut}%
        !          3770: }
        !          3771: 
        !          3772: }%end \catcode `\@=11
        !          3773: 
        !          3774: % Set the baselineskip to #1, and the lineskip and strut size
        !          3775: % correspondingly.  There is no deep meaning behind these magic numbers
        !          3776: % used as factors; they just match (closely enough) what Knuth defined.
        !          3777: %
        !          3778: \def\lineskipfactor{.08333}
        !          3779: \def\strutheightpercent{.70833}
        !          3780: \def\strutdepthpercent {.29167}
        !          3781: %
        !          3782: \def\setleading#1{%
        !          3783:   \normalbaselineskip = #1\relax
        !          3784:   \normallineskip = \lineskipfactor\normalbaselineskip
        !          3785:   \normalbaselines
        !          3786:   \setbox\strutbox =\hbox{%
        !          3787:     \vrule width0pt height\strutheightpercent\baselineskip
        !          3788:                     depth \strutdepthpercent \baselineskip
        !          3789:   }%
        !          3790: }
        !          3791: 
        !          3792: % @| inserts a changebar to the left of the current line.  It should
        !          3793: % surround any changed text.  This approach does *not* work if the
        !          3794: % change spans more than two lines of output.  To handle that, we would
        !          3795: % have adopt a much more difficult approach (putting marks into the main
        !          3796: % vertical list for the beginning and end of each change).
        !          3797: %
        !          3798: \def\|{%
        !          3799:   % \vadjust can only be used in horizontal mode.
        !          3800:   \leavevmode
        !          3801:   %
        !          3802:   % Append this vertical mode material after the current line in the output.
        !          3803:   \vadjust{%
        !          3804:     % We want to insert a rule with the height and depth of the current
        !          3805:     % leading; that is exactly what \strutbox is supposed to record.
        !          3806:     \vskip-\baselineskip
        !          3807:     %
        !          3808:     % \vadjust-items are inserted at the left edge of the type.  So
        !          3809:     % the \llap here moves out into the left-hand margin.
        !          3810:     \llap{%
        !          3811:       %
        !          3812:       % For a thicker or thinner bar, change the `1pt'.
        !          3813:       \vrule height\baselineskip width1pt
        !          3814:       %
        !          3815:       % This is the space between the bar and the text.
        !          3816:       \hskip 12pt
        !          3817:     }%
        !          3818:   }%
        !          3819: }
        !          3820: 
        !          3821: % For a final copy, take out the rectangles
        !          3822: % that mark overfull boxes (in case you have decided
        !          3823: % that the text looks ok even though it passes the margin).
        !          3824: %
        !          3825: \def\finalout{\overfullrule=0pt}
        !          3826: 
        !          3827: 
        !          3828: % End of control word definitions.
        !          3829: 
        !          3830: \message{and turning on texinfo input format.}
        !          3831: 
        !          3832: \def\openindices{%
        !          3833:    \newindex{cp}%
        !          3834:    \newcodeindex{fn}%
        !          3835:    \newcodeindex{vr}%
        !          3836:    \newcodeindex{tp}%
        !          3837:    \newcodeindex{ky}%
        !          3838:    \newcodeindex{pg}%
        !          3839: }
        !          3840: 
        !          3841: % Set some numeric style parameters, for 8.5 x 11 format.
        !          3842: 
        !          3843: %\hsize = 6.5in
        !          3844: \newdimen\defaultparindent \defaultparindent = 15pt
        !          3845: \parindent = \defaultparindent
        !          3846: \parskip 18pt plus 1pt
        !          3847: \setleading{15pt}
        !          3848: \advance\topskip by 1.2cm
        !          3849: 
        !          3850: % Prevent underfull vbox error messages.
        !          3851: \vbadness=10000
        !          3852: 
        !          3853: % Following George Bush, just get rid of widows and orphans.
        !          3854: \widowpenalty=10000
        !          3855: \clubpenalty=10000
        !          3856: 
        !          3857: % Use TeX 3.0's \emergencystretch to help line breaking, but if we're
        !          3858: % using an old version of TeX, don't do anything.  We want the amount of
        !          3859: % stretch added to depend on the line length, hence the dependence on
        !          3860: % \hsize.  This makes it come to about 9pt for the 8.5x11 format.
        !          3861: %
        !          3862: \ifx\emergencystretch\thisisundefined
        !          3863:   % Allow us to assign to \emergencystretch anyway.
        !          3864:   \def\emergencystretch{\dimen0}%
        !          3865: \else
        !          3866:   \emergencystretch = \hsize
        !          3867:   \divide\emergencystretch by 45
        !          3868: \fi
        !          3869: 
        !          3870: % Use @smallbook to reset parameters for 7x9.5 format  (or else 7x9.25)
        !          3871: \def\smallbook{
        !          3872: 
        !          3873: % These values for secheadingskip and subsecheadingskip are
        !          3874: % experiments.  RJC 7 Aug 1992
        !          3875: \global\secheadingskip = 17pt plus 6pt minus 3pt
        !          3876: \global\subsecheadingskip = 14pt plus 6pt minus 3pt
        !          3877: 
        !          3878: \global\lispnarrowing = 0.3in
        !          3879: \setleading{12pt}
        !          3880: \advance\topskip by -1cm
        !          3881: \global\parskip 3pt plus 1pt
        !          3882: \global\hsize = 5in
        !          3883: \global\vsize=7.5in
        !          3884: \global\tolerance=700
        !          3885: \global\hfuzz=1pt
        !          3886: \global\contentsrightmargin=0pt
        !          3887: 
        !          3888: \global\pagewidth=\hsize
        !          3889: \global\pageheight=\vsize
        !          3890: 
        !          3891: \global\let\smalllisp=\smalllispx
        !          3892: \global\let\smallexample=\smalllispx
        !          3893: \global\def\Esmallexample{\Esmalllisp}
        !          3894: }
        !          3895: 
        !          3896: % Use @afourpaper to print on European A4 paper.
        !          3897: \def\afourpaper{
        !          3898: \global\tolerance=700
        !          3899: \global\hfuzz=1pt
        !          3900: \setleading{12pt}
        !          3901: \global\parskip 15pt plus 1pt
        !          3902: 
        !          3903: \global\vsize= 53\baselineskip
        !          3904: \advance\vsize by \topskip
        !          3905: %\global\hsize=   5.85in     % A4 wide 10pt
        !          3906: \global\hsize=  6.5in
        !          3907: \global\outerhsize=\hsize
        !          3908: \global\advance\outerhsize by 0.5in
        !          3909: \global\outervsize=\vsize
        !          3910: \global\advance\outervsize by 0.6in
        !          3911: 
        !          3912: \global\pagewidth=\hsize
        !          3913: \global\pageheight=\vsize
        !          3914: }
        !          3915: 
        !          3916: % Define macros to output various characters with catcode for normal text.
        !          3917: \catcode`\"=\other
        !          3918: \catcode`\~=\other
        !          3919: \catcode`\^=\other
        !          3920: \catcode`\_=\other
        !          3921: \catcode`\|=\other
        !          3922: \catcode`\<=\other
        !          3923: \catcode`\>=\other
        !          3924: \catcode`\+=\other
        !          3925: \def\normaldoublequote{"}
        !          3926: \def\normaltilde{~}
        !          3927: \def\normalcaret{^}
        !          3928: \def\normalunderscore{_}
        !          3929: \def\normalverticalbar{|}
        !          3930: \def\normalless{<}
        !          3931: \def\normalgreater{>}
        !          3932: \def\normalplus{+}
        !          3933: 
        !          3934: % This macro is used to make a character print one way in ttfont
        !          3935: % where it can probably just be output, and another way in other fonts,
        !          3936: % where something hairier probably needs to be done.
        !          3937: %
        !          3938: % #1 is what to print if we are indeed using \tt; #2 is what to print
        !          3939: % otherwise.  Since all the Computer Modern typewriter fonts have zero
        !          3940: % interword stretch (and shrink), and it is reasonable to expect all
        !          3941: % typewriter fonts to have this, we can check that font parameter.
        !          3942: %
        !          3943: \def\ifusingtt#1#2{\ifdim \fontdimen3\the\font=0pt #1\else #2\fi}
        !          3944: 
        !          3945: % Turn off all special characters except @
        !          3946: % (and those which the user can use as if they were ordinary).
        !          3947: % Most of these we simply print from the \tt font, but for some, we can
        !          3948: % use math or other variants that look better in normal text.
        !          3949: 
        !          3950: \catcode`\"=\active
        !          3951: \def\activedoublequote{{\tt \char '042}}
        !          3952: \let"=\activedoublequote
        !          3953: \catcode`\~=\active
        !          3954: \def~{{\tt \char '176}}
        !          3955: \chardef\hat=`\^
        !          3956: \catcode`\^=\active
        !          3957: \def^{{\tt \hat}}
        !          3958: 
        !          3959: \catcode`\_=\active
        !          3960: \def_{\ifusingtt\normalunderscore\_}
        !          3961: % Subroutine for the previous macro.
        !          3962: \def\_{\lvvmode \kern.06em \vbox{\hrule width.3em height.1ex}}
        !          3963: 
        !          3964: % \lvvmode is equivalent in function to \leavevmode.
        !          3965: % Using \leavevmode runs into trouble when written out to
        !          3966: % an index file due to the expansion of \leavevmode into ``\unhbox
        !          3967: % \voidb@x'' ---which looks to TeX like ``\unhbox \voidb\x'' due to our
        !          3968: % magic tricks with @.
        !          3969: \def\lvvmode{\vbox to 0pt{}}
        !          3970: 
        !          3971: \catcode`\|=\active
        !          3972: \def|{{\tt \char '174}}
        !          3973: \chardef \less=`\<
        !          3974: \catcode`\<=\active
        !          3975: \def<{{\tt \less}}
        !          3976: \chardef \gtr=`\>
        !          3977: \catcode`\>=\active
        !          3978: \def>{{\tt \gtr}}
        !          3979: \catcode`\+=\active
        !          3980: \def+{{\tt \char 43}}
        !          3981: %\catcode 27=\active
        !          3982: %\def^^[{$\diamondsuit$}
        !          3983: 
        !          3984: % Used sometimes to turn off (effectively) the active characters
        !          3985: % even after parsing them.
        !          3986: \def\turnoffactive{\let"=\normaldoublequote
        !          3987: \let~=\normaltilde
        !          3988: \let^=\normalcaret
        !          3989: \let_=\normalunderscore
        !          3990: \let|=\normalverticalbar
        !          3991: \let<=\normalless
        !          3992: \let>=\normalgreater
        !          3993: \let+=\normalplus}
        !          3994: 
        !          3995: % Set up an active definition for =, but don't enable it most of the time.
        !          3996: {\catcode`\==\active
        !          3997: \global\def={{\tt \char 61}}}
        !          3998: 
        !          3999: \catcode`\@=0
        !          4000: 
        !          4001: % \rawbackslashxx output one backslash character in current font
        !          4002: \global\chardef\rawbackslashxx=`\\
        !          4003: %{\catcode`\\=\other
        !          4004: %@gdef@rawbackslashxx{\}}
        !          4005: 
        !          4006: % \rawbackslash redefines \ as input to do \rawbackslashxx.
        !          4007: {\catcode`\\=\active
        !          4008: @gdef@rawbackslash{@let\=@rawbackslashxx }}
        !          4009: 
        !          4010: % \normalbackslash outputs one backslash in fixed width font.
        !          4011: \def\normalbackslash{{\tt\rawbackslashxx}}
        !          4012: 
        !          4013: % Say @foo, not \foo, in error messages.
        !          4014: \escapechar=`\@
        !          4015: 
        !          4016: % \catcode 17=0   % Define control-q
        !          4017: \catcode`\\=\active
        !          4018: 
        !          4019: % If a .fmt file is being used, we don't want the `\input texinfo' to show up.
        !          4020: % That is what \eatinput is for; after that, the `\' should revert to printing
        !          4021: % a backslash.
        !          4022: %
        !          4023: @gdef@eatinput input texinfo{@fixbackslash}
        !          4024: @global@let\ = @eatinput
        !          4025: 
        !          4026: % On the other hand, perhaps the file did not have a `\input texinfo'. Then
        !          4027: % the first `\{ in the file would cause an error. This macro tries to fix
        !          4028: % that, assuming it is called before the first `\' could plausibly occur.
        !          4029: %
        !          4030: @gdef@fixbackslash{@ifx\@eatinput @let\ = @normalbackslash @fi}
        !          4031: 
        !          4032: %% These look ok in all fonts, so just make them not special.  The @rm below
        !          4033: %% makes sure that the current font starts out as the newly loaded cmr10
        !          4034: @catcode`@$=@other @catcode`@%=@other @catcode`@&=@other @catcode`@#=@other
        !          4035: 
        !          4036: @textfonts
        !          4037: @rm
        !          4038: 
        !          4039: @c Local variables:
        !          4040: @c page-delimiter: "^\\\\message"
        !          4041: @c End:

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