File: gtkada-types.ads

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-----------------------------------------------------------------------
--          GtkAda - Ada95 binding for the Gimp Toolkit              --
--                                                                   --
--                     Copyright (C) 1998-2000                       --
--        Emmanuel Briot, Joel Brobecker and Arnaud Charlet          --
--                                                                   --
-- This library is free software; you can redistribute it and/or     --
-- modify it under the terms of the GNU General Public               --
-- License as published by the Free Software Foundation; either      --
-- version 2 of the License, or (at your option) any later version.  --
--                                                                   --
-- This library is distributed in the hope that it will be useful,   --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of    --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU --
-- General Public License for more details.                          --
--                                                                   --
-- You should have received a copy of the GNU General Public         --
-- License along with this library; if not, write to the             --
-- Free Software Foundation, Inc., 59 Temple Place - Suite 330,      --
-- Boston, MA 02111-1307, USA.                                       --
--                                                                   --
-----------------------------------------------------------------------

--  <description>
--
--  This package provides GtkAda specific types and their associated functions.
--
--  </description>

with Interfaces.C.Strings;

package Gtkada.Types is

   pragma Preelaborate;

   Data_Error : exception;

   subtype Chars_Ptr is Interfaces.C.Strings.chars_ptr;
   subtype Chars_Ptr_Array is Interfaces.C.Strings.chars_ptr_array;

   procedure g_free (Mem : Chars_Ptr);
   --  Free a C string returned from Gtk.

   Null_Ptr : Chars_Ptr renames Interfaces.C.Strings.Null_Ptr;

   function Null_Array return Chars_Ptr_Array;
   --  Return a null array.
   pragma Inline (Null_Array);

   -------------------------------------
   --  Handling of arrays of Strings  --
   -------------------------------------
   --  The following functions provide a very convenient way to create
   --  C arrays of null terminated strings in Ada.
   --
   --  You can either create such a String on the fly, or declare a variable:
   --
   --     Signals : Chars_Ptr_Array := "clicked" + "missed" + "new signal";
   --
   --  which corresponds to the C declaration:
   --
   --     char *signals[] = @{"clicked", "missed", "new signal"@};
   --
   --  Note that you still need to manually call Free (Signals) if you want to
   --  release the memory dynamically allocated by the "+" functions.

   function "+" (S1, S2 : String) return Chars_Ptr_Array;
   --  Create an array containing S1 and S2.
   --  Note that this function allocates memory to store S1 and S2 as null
   --  terminated Strings. The user is responsible for calling Free on the
   --  resulting array.

   function "+" (S1 : Chars_Ptr_Array; S2 : String) return Chars_Ptr_Array;
   --  Append S2 to S1.
   --  Note that this function allocates memory to store S2 as a null
   --  terminated Strings. The user is responsible for calling Free on the
   --  resulting array.

   function "+" (S1 : Chars_Ptr_Array; S2 : Chars_Ptr) return Chars_Ptr_Array;
   --  Append S2 to S1.
   --  Note that this function allocates memory to store S2 as a null
   --  terminated Strings. The user is responsible for calling Free on the
   --  resulting array.

   function "+" (S1 : Chars_Ptr; S2 : String) return Chars_Ptr_Array;
   --  Create an array containing S1 and S2.
   --  Note that this function allocates memory to store S2 as a null
   --  terminated string. The user is responsible for calling Free on the
   --  resulting array.

   procedure Free (A : in out Chars_Ptr_Array);
   --  Free all the strings in A.

private
   pragma Import (C, g_free, "g_free");
end Gtkada.Types;