Re: crypto_memset (was: Re: Zero it if you're going to copy it out.)

[Jean-Yves Migeon <jeanyves.migeon%free.fr@localhost>]

On 22.07.2012 18:01, Alan Barrett wrote:
> I have an implementation of memset_s.  It's fairly intrusive, in that
> several header files need extra declarations for strange types, and I
> haven't implemented the constraint handler callbacks.

Strange types?

> It's easy to usae volatile pointers to define functions that will not be
> optinmised away.  For example (from a message I sent in Febroary 2012):
> 
>         /*
>          * memset_volatile is a volatile pointer to the memset function.
>          * You can call (*memset_volatile)(buf, val, len) or even
>          * memset_volatile(buf, val, len) just as you would call
>          * memset(buf, val, len), but the use of a volatile pointer
>          * guarantees that the compiler will not optimise the call away.
>          */
>         void * (* volatile memset_volatile)(void *, int, size_t) = memset;
> 
> I think I like "explicit_memset" better than "memset_volatile" as the
> function name.

Describes function's usage better, yes.

-- 
Jean-Yves Migeon
jeanyves.migeon%free.fr@localhost