In message <200103300647.WAA25263@shell17.ba.best.com>, Todd Whitesel writes:
>Just put a 1-element array at the end of your header struct, and account for
>it when you work out how much extra space to allocate. C memory layout rules
>guarantee that this usage will have the desired effect.

Nope, not portable.  The implementation is allowed to bust you for
overstepping the bounds of the array.  :)

The only portable solution is the new feature in C99.

-s