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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 18.2.8, p. III-21.
+% Original source in file "tokens1.TEX", starting line 1295.
+\wlog{L: "countl.tip" ["tokens1.TEX," l. 1295, p. III-21]}%
+% This file DOES belong to format "texip."
+\InputD{doloop.tip}
+\InputD{comfiles.tip}
+\newcount\ReturnNumberOfLinesInFile
+\catcode`\@ = 11
+\newcount\@CharCodeNumberOfLines
+{
+ \catcode`\^^M = \active %
+ \gdef\@SetUpLineCounting{%
+ \gdef
+ {\global\advance\ReturnNumberOfLinesInFile by 1 }%
+ }%
+}
+\def\NumberOfLinesInFile #1{%
+ \begingroup
+ \global\ReturnNumberOfLinesInFile = 0
+ \DoLoop{\@CharCodeNumberOfLines}{0}{1}{127}%
+ {\catcode\@CharCodeNumberOfLines = 9 }
+ \@SetUpLineCounting
+ \catcode`\^^M = \active
+ \input #1
+ \endgroup
+ \ifnum\ReturnNumberOfLinesInFile = 1
+ \if\CompareFilesConditional{#1}{nul}%
+ \ReturnNumberOfLinesInFile = 0
+ \fi
+ \fi
+}
+\catcode`\@ = 12