Re: [Spark] Arrays of Strings

[mheaney@on2.com (Matthew Heaney)]

"Eric G. Miller" <egm2@Jay-Pee-eSs.net> wrote in message news:<pan.2003.04.09.07.50.03.727731@Jay-Pee-eSs.net>...
> 
> Try the following out (rename "/tmp/hello" as appropriate)...
> 
> -- executor.ads
> with Interfaces.C.Strings;
> 
> package Executor is
> 
>    package C renames Interfaces.C;
> 
>    function Execve (Filename : C.Strings.Chars_Ptr;
>                     Argv     : C.Strings.Chars_Ptr_Array;
>                     Envp     : C.Strings.Chars_Ptr_Array) return C.Int;
> 
>    pragma Import (Convention => C,
>                   Entity => Execve,
>                   External_Name => "execve");
> 

The problem is that C.Strings.chars_ptr_array isn't necessarily
C-compatible, because the RM doesn't promise that it is.

The other issue is that char_ptr_array is unconstrained, which means
it'll try to pass dope over the interface, which is basically
meaningless.  Instead of passing array (unconstrained) array type,
pass an array access type instead.  A component pointer (here, an
access type that designates type chars_ptr) would work too, as I
showed in my previous post.