Re: [PATCH] Trivial warning fix for imap-send.c

From: A Large Angry SCM <gitzilla@gmail.com>
Date: Mar 12, 2006, 19:20 UTC
Message-ID: <4414747B.7040700@gmail.com>
In-Reply-To: <slrne18of5.fr9.mdw@metalzone.distorted.org.uk>

Mark Wooding wrote:

Show 11 quoted lines

> Linus Torvalds <torvalds@osdl.org> wrote:
> 
>>So in modern C, using NULL at the end of a varargs array as a pointer is 
>>perfectly sane, and the extra cast is just ugly and bowing to bad 
>>programming practices and makes no sense to anybody who never saw the 
>>horror that is K&R.
> 
> No!  You can still get bitten.  You're lucky that on common platforms
> all pointers look the same, but if you find one where `char *' (and
> hence `void *') isn't the same as `struct foo *' then, under appropriate
> circumstances you /will/ unless you put the casts in.

Please explain how malloc() can work on such a platform. My reading of the '89 ANSI C spec. finds that _ALL_ (non function) pointers _are_ cast-able to/from a void * and that NULL should be #defined as (void *). See 3.2.2.3 and 4.1.5 if interested.