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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 12.6.4, p. II-135.
+% Original source in file "par3.TEX", starting line 1322.
+\wlog{L: "firstldi.tip" ["par3.TEX," l. 1322, p. II-135]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\def\FirstLineSpecial #1{%
+ \par
+ \begingroup
+ #1
+ \def\@FLDTemp{}%
+ \dimen0 = \parindent
+ \setbox0 = \hbox{ }%
+ \advance\dimen0 by -\wd0
+ \@FLDOne
+}
+\def\@FLDOne #1 {%
+ \wlog{\string\@FLDOne: called with "#1".}%
+ \xdef\@FLDTempa{#1\ }%
+ \@FLDTwo
+}
+\def\@FLDTwo{%
+ \wlog{\string\@FLDTwo: called}%
+ \setbox0 = \hbox{\@FLDTempa}%
+ \advance\dimen0 by \wd0
+ \ifdim\dimen0 < \hsize
+ \edef\@FLDTemp{\@FLDTemp\@FLDTempa}%
+ \let\@FLDNext = \@FLDOne
+ \else
+ \leavevmode
+ \@FLDTemp
+ \unskip
+ \break
+ \aftergroup\@FLDTempa
+ \let\@FLDNext = \endgroup
+ \fi
+ \@FLDNext
+}
+\catcode`\@ = 12