Checking that a memory area is empty

[Mike Frysinger]

On Wednesday 06 February 2013 09:54:09 Rich Felker wrote:
> On Wed, Feb 06, 2013 at 09:11:19AM +0100, Shérab wrote:
> > It seems there is no function in the glibc at the moment to check
> > whether a memory area is empty (contains onlyzeros).
> > 
> > If this is correct, would it be possible to add such a function?
> 
> Slightly off-topic, but if your program needs such a function, it
> could easily be implemented in terms of a loop performing memcmp on a
> fixed-max-size subrange against a static const zero buffer of the
> particular size.

that might be a bit faster, but it sounds like memspn()/memcspn() funcs would 
work too.  googling for those func names turns up quite a number of existing 
implementations.
-mike
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