Interfacing with c and platform dependent sizes

[simendsjo]

C is not my strong side, so I'm having some problems wrapping some code.

I found a couple of sources on this:
1) http://www.digitalmars.com/d/2.0/htomodule.html
2) http://www.digitalmars.com/d/2.0/interfaceToC.html

1)
C's long is the same as D's int.
long long is long

2)
C 32bit's long long is D's long, C 64 bits long is D's long.

So.. A long in C is the same as the platform size? And long long doesn't 
exist in 64 bit?