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Re: NULL pointers.

From: Branko Čibej <brane_at_xbc.nu>
Date: 2003-10-16 15:55:00 CEST

Marc Singer wrote:

>On Mon, Oct 13, 2003 at 11:10:12PM -0400, Daniel Berlin wrote:
>>"An integer constant expression with the value 0, or such an expression
>>cast to type void *, iscalled anull pointer constant.
>Again, this isn't the point. Yes, you are well acquainted with the C
ROTFL! Dan, how many decades have you spent hacking GCC? :-)

Marc: the question you want to ask is, "is there an architecture where a
value with all bits zero is not a representation of the null pointer
constant". And the answer is yes, there are a few such architectures.

>AFAIK, there are no representations of null that are not zero.
That turns out not to be the case.

>Initializers of zero work properly, BSS initialization works properly,
>as does bzero'ing a region of memory.
Heh. All the world is not Unix, and some systems don't even _have_ a BSS.

Brane Čibej   <brane_at_xbc.nu>   http://www.xbc.nu/brane/
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Received on Thu Oct 16 15:58:10 2003

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