% 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

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