[texhax] Strange \loop-behaviour

[Philip and Le Khanh]

The problem lies in the incomplete assignment
to \more; better would be the following --

\ifeof 1\more = 0\relax \fi

Philip TAYLOR
--------
Reiner Durchholz wrote:
> This is a report of what I believe is a flaw in the "\loop" implementation.
> The appended source text behaves differently with and without the 
> \null-command.
> Instead of \null, almost any other command can be used.
> The flaw came to my attention when I first used a \showthe for error 
> analysis.
> 
> The used system is OS X 10.5.5.
> The TeX system is TeXShop V2.26 with  XeTeXk, Version 
> 3.1415926-2.2-0.999.6 (Web2C 7.5.7)
> 
> %!TEX TS-program = xetex
> %!TEX encoding = UTF-8 Unicode
> \parindent=0cm 
> % ______________________________________________________
> \openin1=TestObject 
> \newcount\more \more=1 % used as boolean, set to "true"                
> % -----------------------------------------
> \loop
> \read 1 to \InputLine  
> \ifeof1\more=0\fi
> \null % without this command, the loop either does not end or ends 
> immediately 
> \number\more
> \ifnum\more=1
>  -- \InputLine\ +++ \hfil\break
> \repeat
> % -----------------------------------------
> \closein1
> \bye
> 
> 
> 
>  -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - -- -- -- -- 
> -- -- - -- -- -- -- -- -- --
>   Dr. Reiner Durchholz
>  -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - -- -- -- -- 
> -- -- - -- -- -- -- -- -- --
> 
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> TeX FAQ: http://www.tex.ac.uk/faq
> Mailing list archives: http://tug.org/pipermail/texhax/
> More links: http://tug.org/begin.html
> 
> Automated subscription management: http://tug.org/mailman/listinfo/texhax
> Human mailing list managers: postmaster at tug.org