On 27/06/17 16:29, Zando Fardones wrote:
> Hello,
> 
> I think I've found a bug when using the here-document redirection in
> an interactive shell. What basically happens is that you can't see the
> command output if you set the "vi" or "emacs" options.

That's not quite what happens: the here-document contents got lost, so 
there is no command output to see. Nice find.

The problem is that getprompt() is implicitly called by el_gets(). This 
messes with the memory used by the parser to store the here-document's 
contents. In the non-emacs/vi case, the prompt is explicitly written by 
setprompt(), which wraps the getprompt() call in a 
pushstackmark()/popstackmark() pair to restore the state so that parsing 
can continue. But when getprompt() is called by el_gets(), it knows 
nothing about this.

The whole call to el_gets() can be surrounded by another 
pushstackmark()/popstackmark() pair to solve the problem, as attached.

Cheers,
Harald van Dijk