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From: "H. Peter Anvin" <hpa@zytor.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org
Subject: Re: [PATCH] Trivial warning fix for imap-send.c
Date: Sun, 12 Mar 2006 22:41:35 -0800	[thread overview]
Message-ID: <4415141F.2080604@zytor.com> (raw)
In-Reply-To: <20060313033805.GB14601@coredump.intra.peff.net>

Jeff King wrote:
> 
> I think Linus has cut to the heart of the discussion (that it's worth
> git maintainers' sanity not to worry about such problems). However, for
> pedantry's sake, this is how malloc works:
> 
> A void pointer is guaranteed to be able to hold any type of pointer
> (either char * or struct foo * or whatever). The declaration of malloc
> indicates a return of void *. On a platform where it matters, the
> compiler generates code so that 
>   struct foo *bar = malloc(100);
> converts the void * pointer into the correct size (in the same way that
> assigning between differently sized integers works).
> 

Furthermore, the return value of malloc() (calloc, realloc, ...) is 
guaranteed to be a value suitable for casting to any pointer type for 
which at least one object can fit in the allocated memory block.

	-hpa

  parent reply	other threads:[~2006-03-13  6:41 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-03-11 19:29 [PATCH] Trivial warning fix for imap-send.c Art Haas
2006-03-12 10:44 ` Mark Wooding
2006-03-12 11:27   ` Junio C Hamano
2006-03-12 13:59     ` [PATCH] Use explicit pointers for execl...() sentinels Mark Wooding
2006-03-12 15:13       ` Timo Hirvonen
2006-03-12 17:32         ` Mark Wooding
2006-03-12 18:08           ` Timo Hirvonen
2006-03-13  3:31             ` Jeff King
2006-03-13  4:12               ` Horst von Brand
2006-03-14  0:42                 ` [OT] " Jeff King
2006-03-12 16:57   ` [PATCH] Trivial warning fix for imap-send.c Linus Torvalds
2006-03-12 18:01     ` Mark Wooding
2006-03-12 19:20       ` A Large Angry SCM
2006-03-13  2:59         ` H. Peter Anvin
2006-03-13  4:36           ` A Large Angry SCM
2006-03-13  5:22             ` Linus Torvalds
2006-03-13  6:37               ` H. Peter Anvin
2006-03-13  6:46                 ` Linus Torvalds
2006-03-13 16:37                 ` Olivier Galibert
2006-03-13  3:38         ` Jeff King
2006-03-13  4:14           ` Horst von Brand
2006-03-13 16:26             ` Linus Torvalds
2006-03-13  6:41           ` H. Peter Anvin [this message]
2006-03-12 21:51       ` Horst von Brand
2006-03-12 23:02       ` Linus Torvalds

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