[luatex] Null bite doesn't write to file

[Hans Hagen]

On 3/5/2020 1:07 PM, Phelype Oleinik wrote:
> Hi all,
> 
> When writing a null byte to a file, as in `\immediate\write\test{abc^^@def}`,
> the tokens after the null byte are not written (because of C's \0 string
> termination, I suppose?). The code:
> 
> \newwrite\test
> \immediate\openout\test=testfile.tex
> \catcode`\^^@=12
> \immediate\write\test{abc   def}
> \immediate\write\test{abc^^@def}
> \closeout\test
> \bye
> 
> when run with LuaTeX produces testfile.tex with:
> 
> abc def
> abc
> 
> whereas pdfTeX and XeTeX it produces:
> 
> abc def
> abc^^@def
> 
> (or something like that, depending on the -8bit flag).
> 
> Is it a bug? Can it be reasonably fixed?
it's more a side effect of luatex being a mix that uses c strings in 
many places (and some internals can optionally go through callbacks)

anyway, i looked at it and can make it work but this change in behaviour 
will have to wait till *after* the tex live code freeze (which then 
gives folks a year to adapt to it)

Hans


-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------