% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 11.5.5, p. II-93.
% Original source in file "par2.TEX", starting line 2264.
\wlog{L: "genhead.tip" ["par2.TEX," l. 2264, p. II-93]}%
% This file DOES belong to format "texip."
\InputD{vsmax.tip}
\InputD{box-mac.tip}
\InputD{parin.tip}
\newtoks\EveryHeading
\EveryHeading = {}
\catcode`\@ = 11
\newcount\@GenericHeadingCount
\newcount\@GenericHeadingIndent
\def\LineBreakHeading{%
   \errmessage{%
       \string\LineBreakHeading/\string\LineBreakToc:
           can only be used inside a heading.}%
}
\let\LineBreakToc = \LineBreakHeading
\def\IgnoreInRunnningHead #1{%
   #1%
}
\def\GenericHeading #1#2#3#4#5{%
   \par
   \the\EveryHeading
   \@GenericHeadingCount = #1
   \@GenericHeadingIndent = #5
   \MaxVskip{#2}%
   \ifdim\leftskip = 0pt
   \else
       \message{\string\GenericHeading: \noexpand\leftskip
           is non-zero, forgotten to terminate a list?}%
   \fi
   \begingroup
   \interlinepenalty = 10000
   \parindent = 0pt
   \parskip = 0pt
   \ifnum #4 = 1
       \hyphenpenalty = 10000
   \fi
   \ifnum #3 = 1
       \rightskip = 0pt plus 50pt
   \fi
   \@GenericHeading
}
\def\@GenericHeading #1#2#3#4#5#6#7{%
       #3%
       \def\LineBreakHeading{\hfil\break}%
       \def\LineBreakToc{ }%
       \ifdim #4 > 0pt
           \ifnum\@GenericHeadingIndent = 0
               \hangindent = #4
               \hangafter = 1
               \leavevmode
               \hbox to #4{#5\hfil}%
           \else
               \leavevmode
               \hbox to #4{#5\hfil}%
           \fi
       \else
           \setbox0 = \hbox{#5\hskip -#4}
           \ifnum\@GenericHeadingIndent = 0
               \hangindent = \wd0
               \hangafter = 1
               \leavevmode
               \box0
           \else
               \leavevmode
               \box0
           \fi
       \fi
       #6%
       \if\NameDefinedConditional{WriteToAuxSpecial}%
           \def\LineBreakToc{\hfil\break}%
           \def\LineBreakHeading{ }%
           \WriteToAuxSpecial{toc}{\the\@GenericHeadingCount}%
               {#5}{#7}{\PrintCounter{PageNo}}%
       \fi
       \par
   \endgroup
   \nobreak
   \vskip #1
   \ifnum #2 = 0
       \SuppressNextParIndent
   \fi
}
\catcode`\@ = 12

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