[cffi-devel] Long Long

[Luis Oliveira]

On 18/set/2005, at 17:46, Jeff Huter wrote:
> Any chance of support for long long ints in the near future?  If not, 
> any
> suggestions how to work around?  I'm currently trying to bind to some
> systems level routines and long long ints are used somewhat 
> frequently.  I
> thought I might be able to generate a struct of two long ints to 
> receive
> the long long int.  But my first attempts have resulted in segmentation
> violations.

AFAICT, no Lisp actually supports "long long", or if they do it's 
undocumented.

Trying to use a struct with two longs won't work, among other reasons, 
because we pass structs by reference. So, you were actually trying to 
fit a long long in a pointer (an int), and then dereferencing that.

CLISP allegedly supports an :[us]int64 type, but I couldn't get it to 
work under either linux/x86 or darwin/ppc. I suppose it only works on 
64bit platforms? I guess you're out of luck there too.

All I can think of is ugly C glue to split long long into two longs 
(pretty much what you intended to do using a struct). You should 
probably ask your lisp vendor for long long support. :-/

-- 
Luís Oliveira
http://student.dei.uc.pt/~lmoliv/
Equipa Portuguesa do Translation Project
http://www.iro.umontreal.ca/translation/registry.cgi?team=pt