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From: "hannibal.holm@gmail.com" <hannibal.holm@gmail.com>
Newsgroups: comp.lang.ada
Subject: Calling Ada from C
Date: 22 Feb 2007 07:46:48 -0800
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Date: 2007-02-22T07:46:48-08:00
List-Id: <comp.lang.ada>

I have a slight problem trying to call an Ada function from a C
function. I need to pass in an unconstrained array to the Ada
function. The problem is how I specify the size.

This is probably very simple, but I am more or less just getting
started with Ada, comming from a C-background.

My code yealds warnings like this (when compiled with GNAT):

foo.ads:50:23: warning: type of argument "Insert_C.Packet" is
unconstrained array
foo.ads:50:23: warning: foreign caller must pass bounds explicitly

I have been searching a lot in order to figure out what to do about
this, but all the FFI documentation is for calling C-functions from
Ada, and some very simple examples of how to call ada functions that
take primitive arguments (ints, and similar items).

Anyone who know how to pass in the bounds explicitly?