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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
+}