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=-0.9 required=5.0 tests=BAYES_00,FORGED_GMAIL_RCVD,
	FREEMAIL_FROM autolearn=no autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail
From: =?UTF-8?Q?Bj=c3=b6rn_Lundin?= <b.f.lundin@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: How to bind this properly, C ** which is an array
Date: Fri, 1 Mar 2019 14:54:29 +0100
Organization: A noiseless patient Spider
Message-ID: <q5bdim$4iv$1@dont-email.me>
References: <1bb2318a-eb48-450f-908d-a304b92bd74c@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Injection-Date: Fri, 1 Mar 2019 13:54:31 -0000 (UTC)
Injection-Info: reader02.eternal-september.org;
 posting-host="a169a42440eacaa7054d6e86ffbce0de";
	logging-data="4703"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX1+RPELK1HPPLXpWQQB1/3Kh"
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.8.0
Cancel-Lock: sha1:DQQxNSiDlOk60BB1GcFddGbw0bU=
In-Reply-To: <1bb2318a-eb48-450f-908d-a304b92bd74c@googlegroups.com>
Content-Language: sv-FI
Xref: reader01.eternal-september.org comp.lang.ada:55737
Date: 2019-03-01T14:54:29+01:00
List-Id: <comp.lang.ada>

On 2019-03-01 14:48, Lucretia wrote:
> Hi,
> 
> I'm trying to bind the following struct:
> 
> typedef struct mpc_ast_t {
>   char *tag;
>   char *contents;
>   mpc_state_t state;
>   int children_num;
>   struct mpc_ast_t** children;
> } mpc_ast_t;
> 
> I have this:
> 
>    type ASTs is
>    record
>       Tag                : C.Strings.chars_ptr;
>       Contents           : C.Strings.chars_ptr;
>       State              : States;
>       Number_Of_Children : C.int;
>       Children           : System.Address; --  Pointer to a pointer to an array of ASTs.
>    end record with
>      Convention => C;
> 
> Children needs to be accessed in code as a pointer to a pointer to an array of ASTs.
> 
> How do I best bind this thing? It's likely going to have to be converted from Address to a particular type using Unchecked_Conversion most likely.
> 
> Thanks,
> Luke.
> 

naïvly I would have tried something like

 type Ptr_To_Chars_Ptr is access all C.Strings.chars_ptr;

    type ASTs is
    record
       Tag                : C.Strings.chars_ptr;
       Contents           : C.Strings.chars_ptr;
       State              : States;
       Number_Of_Children : C.int;
       Children           : Ptr_To_Chars_Ptr;
    end record with
      Convention => C;


-- 
--
Björn