Re: C library

Bernd Paysan <[email protected]> Fri, 29 Sep 2023 04:17:28 +0200

Newsgroups	gmane.comp.lang.forth.gforth
Message-ID	<2627299.k3LOHGUjKi@liubei>

Am Donnerstag, 28. September 2023, 20:00:34 CEST schrieb Mario Beaulieu via 
Gforth discussion and announcements:
> c-function mosquitto_new   mosquittoNew a n void -- "What do I put here?"

This should be:

c-function mosquittoNew mosquitto_new s n a -- a

The order of names (Forth name first, C name second) matters, and for the 
paramenters: whatever address it is, it should be an a type, i.e. whenever the 
C programmer writes a * at the end of the type, it is an a.  Unless of course 
if it is a const char *, i.e. a string, then it is more comfortable to pass a 
Forth string to C, and use the s type, so you can call

s" my id" 1 callback-object mosquittoNew

and the s type constructs a zero terminated C string out of that Forth string.

-- 
Bernd Paysan
"If you want it done right, you have to do it yourself"
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https://net2o.de/

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