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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . W I D _ E N U M --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2009, 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.Wid_Enum is
+
+ -------------------------
+ -- Width_Enumeration_8 --
+ -------------------------
+
+ function Width_Enumeration_8
+ (Names : String;
+ Indexes : System.Address;
+ Lo, Hi : Natural)
+ return Natural
+ is
+ pragma Warnings (Off, Names);
+
+ W : Natural;
+
+ type Natural_8 is range 0 .. 2 ** 7 - 1;
+ type Index_Table is array (Natural) of Natural_8;
+ 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);
+
+ begin
+ W := 0;
+
+ for J in Lo .. Hi loop
+ W := Natural'Max (W, Natural (IndexesT (J + 1) - IndexesT (J)));
+ end loop;
+
+ return W;
+ end Width_Enumeration_8;
+
+ --------------------------
+ -- Width_Enumeration_16 --
+ --------------------------
+
+ function Width_Enumeration_16
+ (Names : String;
+ Indexes : System.Address;
+ Lo, Hi : Natural)
+ return Natural
+ is
+ pragma Warnings (Off, Names);
+
+ W : Natural;
+
+ type Natural_16 is range 0 .. 2 ** 15 - 1;
+ type Index_Table is array (Natural) of Natural_16;
+ 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);
+
+ begin
+ W := 0;
+
+ for J in Lo .. Hi loop
+ W := Natural'Max (W, Natural (IndexesT (J + 1) - IndexesT (J)));
+ end loop;
+
+ return W;
+ end Width_Enumeration_16;
+
+ --------------------------
+ -- Width_Enumeration_32 --
+ --------------------------
+
+ function Width_Enumeration_32
+ (Names : String;
+ Indexes : System.Address;
+ Lo, Hi : Natural)
+ return Natural
+ is
+ pragma Warnings (Off, Names);
+
+ W : Natural;
+
+ type Natural_32 is range 0 .. 2 ** 31 - 1;
+ type Index_Table is array (Natural) of Natural_32;
+ 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);
+
+ begin
+ W := 0;
+
+ for J in Lo .. Hi loop
+ W := Natural'Max (W, Natural (IndexesT (J + 1) - IndexesT (J)));
+ end loop;
+
+ return W;
+ end Width_Enumeration_32;
+
+end System.Wid_Enum;