From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM,
	WEIRD_PORT autolearn=ham autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!postnews.google.com!l34g2000vba.googlegroups.com!not-for-mail
From: Mike <michael_tabak@yahoo.com>
Newsgroups: comp.lang.ada
Subject: calling ada from c with an array param
Date: Sun, 20 Sep 2009 12:38:04 -0700 (PDT)
Organization: http://groups.google.com
Message-ID: 
 <0208bf86-cba9-45db-a43c-53c249bf9ae6@l34g2000vba.googlegroups.com>
NNTP-Posting-Host: 157.127.124.15
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
X-Trace: posting.google.com 1253475485 30658 127.0.0.1 (20 Sep 2009 19:38:05
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Sun, 20 Sep 2009 19:38:05 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: l34g2000vba.googlegroups.com; posting-host=157.127.124.15;
	posting-account=75iYsQoAAABUEoLZrxFNnZsTxbZSb5pV
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3)
	Gecko/20090824 Firefox/3.5.3,gzip(gfe),gzip(gfe)
Xref: g2news2.google.com comp.lang.ada:8409
Date: 2009-09-20T12:38:04-07:00
List-Id: <comp.lang.ada>

I'm new to Ada so I'm trying to expand a simple c example that passed
primitive types to an Ada
function. I'm trying to call an ada procedure from a c program with an
in out float array using GNAT. I read you should not use an
unconstrained array so I tried the following

The c program is

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

extern void adainit (void);
extern void adafinal (void);
extern int conjunc (float[], int);

int main (int argc, char *argv[])
{

   int i;
   float b[3] = {0.0, 0.0, 0.0};

   adainit();

   conjunc(a, 4);

   for (i = 0; i < 3; i++)
   {
     printf("a[%d] = %f, b[%d] = %f\n", i, a[i], b[i]);
   }

   adafinal();

 }

The .ads file is

--  conjunc.ads
package conjunc is
   type Float_Array is array (Integer range <>) of Float;
   subtype Contrained_Float_Array is Float_Array (1 .. Integer'Last);
   procedure conj (A: in out Constrained_Float_Array; Len: in
Integer);
   pragma Export (C, conj, "conj");
end conjunc;

and the procedure .adb file is

 --  conjunc.adb
package body conjunc is
   type Float_Array is array (Integer range <>) of Float;
   subtype Contrained_Float_Array is Float_Array (1 .. Integer'Last);
   procedure conj (A: in out Constrained_Float_Array; Len :in Integer)
is
   begin
       A(1) := 99;
       A(2) := 100;
       A(3) := 101;
       A(4) := 102;
   end conj;
end conjunc;


The procedure to build it is first gcc -c cjserver.c which works fine,
then gnatmake -c conjunc.adb which gives me the following error:

conjunc.adb:3:09: "Float_Array" conflicts with declaration at
conjunc.ads:3
conjunc.adb:4:12: "Contrained_Float_Array" conflicts with declaration
at conjunc.ads:4
conjunc.ads:5:30: "Constrained_Float_Array" is undefined (more
references follow)
conjunc.ads:5:30: possible misspelling of "Contrained_Float_Array"

Obviously there is a problem declaring the array, but I'm not sure
where it goes. Can someone help?

Thanks
Mike