info/examples/tip/freespac.tip


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% 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 32.2.4, p. IV-6.
% Original source in file "page.TEX", starting line 340.
\wlog{L: "freespac.tip" ["page.TEX," l. 340, p. IV-6]}%
% This file DOES belong to format "texip."
\InputD{lpagetg.tip}
\newdimen\FreePageSpace
\def\ComputeFreeSpaceOnPage{%
    \par
    \LogPageTG{\string\ComputeFreeSpaceOnPage}%
    \ifdim\pagetotal = 0pt
        \FreePageSpace = \vsize
    \else
        \FreePageSpace = \pagegoal
        \advance\FreePageSpace by -\pagetotal
    \fi
}
\def\FreeSpaceConditional{%
    0pt = 0pt \fi
    \ComputeFreeSpaceOnPage
    \ifdim\FreePageSpace
}