Re: Binding to C

["Matthew Heaney" <matthewjheaney@earthlink.net>]

"chris" <spamoff.danx@ntlworld.com> wrote in message
news:MxXSa.2290$l63.28380@newsfep4-glfd.server.ntli.net...
>
> I came across the following in libjpeg... what should I map it to?
>
> const char* const* jpeg_message_table

This is a pointer to a constant array, comprising pointers to constant
strings.

You could use the types in Interfaces.C.*.  Here's another way to do it:

type char_array is array (Natural) of aliased Character;
pragma Convention (C, char_array);
pragma Suppress (Index_Check, On => char_array);

type const_char_ptr is access constant char_array;
for const_char'Storage_Size use 0;
pragma Convention (C, const_char_ptr);

type string_array is array (Natural) of aliased const_char_ptr;
pragma Convention (C, string_array);
pragma Suppress (Index_Check, On => string_array);

type const_string_ptr is access constant string_array;
for const_string_ptr'Storage_Size use 0;
pragma Convention (C, const_string_ptr);

JPEG_Message_Table : const_string_ptr;  -- voila!

-Matt