Re: Lisp object that refers to a C struct

[Paul Eggert]

On 10/17/2012 01:46 PM, Eli Zaretskii wrote:
>> How do you convert the integer into the C struct pointer?
>   struct foo *pwatch = (struct foo *)XLI (watch_descriptor);
> 
> where watch_descriptor is a Lisp integer.

Won't this have problems on platforms where
(EMACS_INT) pwatch < MOST_NEGATIVE_FIXNUM,
or where MOST_POSITIVE_FIXNUM < (EMACS_INT) pwatch?

Also, suppose someone makes up a random integer
and then passes it as the watch descriptor --
wouldn't Emacs dump core?