Re: qsort_r

[Alan Barrett <apb%cequrux.com@localhost>]

On Sun, 08 Dec 2013, Mouse wrote:
> > Is just casting the function pointers safe in C
>
> No.  As soon as you call through a pointer to the wrong type 
> you're off in nasal demon territory.  (Loosely put; I'd have to 
> look up the exact wording - there is a little wiggle room, but, 
> if I've understood the subject of the discussion correctly, not 
> enough.)

You can't call through a function pointer of the wrong type, but 
you can cast from one type to another.  I think that's enough, 
provided that void * is large enough to be converted to and from a 
function pointer.

> If you can find me a description of what NetBSD assumes beyond 
> what C promises, I can have a stab at answering that question.

There is no such list.  That's a bug in NetBSD's documentation.

--apb (Alan Barrett)