[luatex] behavior of \write in LuaTeX differs from the one of PdfTeX/XeTeX

[jfbu]

Le 24 mars 2015 à 19:36, jfbu <jfbu at free.fr> a écrit :

> Hi,
> 
> this is presumably related to 
> 
> % http://tracker.luatex.org/view.php?id=733
> 
> % http://tex.stackexchange.com/questions/65151/scantokens-in-luatex
> 
> % http://tug.org/pipermail/lualatex-dev/2011-November/001376.html
> 
> which address the behavior of \scantokens
> 
> While investigating the issue I ended up with this,
> which might very well have been discussed here or is
> already on the tracker.
> 
> If I assign catcode 12 to the CTRL-M character, and then
> \write ^^M to an external file:
> 
> with pdftex/xetex we get ^^M (three characters) in the file
> with LuaTeX we get a single CTRL-M (ascii code 13) in the file
> 
> as a result, the \input then behaves differently
> 
> see MWE below
> 
> %----START
> % author: jfbu
> 
> % Mardi 24 mars 2015 a 19:25:11
> 
> \catcode 13 12 %
> \newwrite\out %
> \immediate\openout\out=\jobname.out %
> \immediate\write\out {a^^Mbcdef}%
> \immediate\closeout\out %
> \catcode 13 5 %
> 
> % luatex writes to the file CTRL-M
> % pdftex/xetex write the three characters ^^M
> 
> % as a result the input now behaves differently
> 
> % luatex will see two lines, hence prints a<space>bcdef<space>+++
> % pdftex/xetex see only one line with catcode 5 token and thus ignore bcdef
> % and print a<space>+++
> \input \jobname.out +++
> \bye
> %----STOP

Forgot to say it is on Mac OS X !

> 
> This is XeTeX, Version 3.14159265-2.6-0.99991 (TeX Live 2014) (preloaded format=xetex 2014.7.10)  24 MAR 2015 19:25
> 
> This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2014) (preloaded format=pdfetex 2015.1.21)  24 MAR 2015 19:35
> 
> This is LuaTeX, Version beta-0.79.1 (TeX Live 2014) (rev 4971)  (format=luatex 2014.7.10)  24 MAR 2015 19:36
> 
> Regards
> 
> Jean-Francois
> 
>