incompatibilities between LuaLaTeX and \typein ?

Question

The following ecm compiles fine with LaTeX and XeLaTeX, but doesn't work with LuaLaTeX :

\documentclass{minimal}
\begin{document}
\typein{test}
\end{document}

And here is the error :

Invalid \endlinechar.
<recently read> \@M 

l.4 \typein{test}

?

\endlinechar seems to get set to \@M which is 10000, a value normally used as maximum for penalties. The TeXBook states that for values <0 and >255 no endline character is appended to the line. Maybe in LuaTeX the value for \endlinechar is limited to some value below 10000 and therefore this causes an error?
The manual of luatex says in the section about modifications: "The upper limit to \endlinechar and \newlinechar is 127.". So it won't work.
\endlinechar=-1 should work for the intended purpose. Note that even if luatex were to accept \endlinechar=10000, this would mean something completely different: in unicode, char 10000 is actually "UPPER RIGHT PENCIL"
@Taco, could you post an answer with the exact code (where should I write \endlinechar=-1 ?), please ?
I assume you will have to redefine \typein, but I assume this should be a job for the lualatex format itself. In any case, you will have to ask a latex expert, which I am definitely not...

Philipp · Answer 1 · 2011-03-02 18:25:47Z

You probably have to patch the kernel (untested):

\def\@xtypein[#1]#2{%
  \typeout{#2}%
  \@tempcnta\endlinechar
  \endlinechar\m@ne
  \read\@inputcheck to#1%
  \endlinechar\@tempcnta
  \@typein}

This should be done at format generation time; you might report it at the LaTeX mailing list (LATEX-L@LISTSERV.UNI-HEIDELBERG.DE).

Matsaya · Accepted Answer · 2011-03-22 15:41:01Z

up vote 3 down vote accepted

I've submitted the bug to LaTeX bugs database and this is now fixed in TeXLive.

answered Mar 22 '11 at 15:41

Matsaya
2,81521122

2 Answers