[PATCH] string: Add tests for zero length string inputs

[Ondřej Bílka]

On Tue, Sep 16, 2014 at 04:40:30PM -0700, Will Newton wrote:
> For the string functions that take string lengths as an argument we
> should ensure that no data is read or written if a length of zero is
> specified. Pointers to PROT_NONE memory are used to ensure that any
> reads or writes will cause a fault.
> 
You do not need these. C standard requires arguments to be valid
pointers for most string functions, and they are already marked nonnull
in header.

Just adding size 0 to inputs would suffice.