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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . I M A G E _ N --
-- --
-- B o d y --
-- --
-- Copyright (C) 2021-2023, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Ada.Unchecked_Conversion;
package body System.Image_N is
-----------------------
-- Image_Enumeration --
-----------------------
procedure Image_Enumeration
(Pos : Natural;
S : in out String;
P : out Natural;
Names : String;
Indexes : System.Address)
is
pragma Assert (S'First = 1);
subtype Names_Index is
Index_Type range Index_Type (Names'First)
.. Index_Type (Names'Last) + 1;
subtype Index is Natural range Natural'First .. Names'Length;
type Index_Table is array (Index) of Names_Index;
type Index_Table_Ptr is access Index_Table;
function To_Index_Table_Ptr is
new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
pragma Assert (Pos in IndexesT'Range);
pragma Assert (Pos + 1 in IndexesT'Range);
Start : constant Natural := Natural (IndexesT (Pos));
Next : constant Natural := Natural (IndexesT (Pos + 1));
pragma Assert (Next - 1 >= Start);
pragma Assert (Start >= Names'First);
pragma Assert (Next - 1 <= Names'Last);
pragma Assert (Next - Start <= S'Last);
-- The caller should guarantee that S is large enough to contain the
-- enumeration image.
begin
S (1 .. Next - Start) := Names (Start .. Next - 1);
P := Next - Start;
end Image_Enumeration;
end System.Image_N;
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