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jeremybenn |
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . W I D _ E N U M --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Ada.Unchecked_Conversion;
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package body System.Wid_Enum is
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-------------------------
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-- Width_Enumeration_8 --
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-------------------------
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function Width_Enumeration_8
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(Names : String;
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Indexes : System.Address;
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Lo, Hi : Natural)
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return Natural
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is
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pragma Warnings (Off, Names);
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W : Natural;
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type Natural_8 is range 0 .. 2 ** 7 - 1;
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type Index_Table is array (Natural) of Natural_8;
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type Index_Table_Ptr is access Index_Table;
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function To_Index_Table_Ptr is
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new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
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IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
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begin
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W := 0;
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for J in Lo .. Hi loop
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W := Natural'Max (W, Natural (IndexesT (J + 1) - IndexesT (J)));
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end loop;
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return W;
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end Width_Enumeration_8;
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--------------------------
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-- Width_Enumeration_16 --
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--------------------------
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function Width_Enumeration_16
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(Names : String;
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Indexes : System.Address;
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Lo, Hi : Natural)
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return Natural
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is
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pragma Warnings (Off, Names);
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W : Natural;
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type Natural_16 is range 0 .. 2 ** 15 - 1;
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type Index_Table is array (Natural) of Natural_16;
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type Index_Table_Ptr is access Index_Table;
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function To_Index_Table_Ptr is
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new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
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IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
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begin
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W := 0;
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for J in Lo .. Hi loop
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W := Natural'Max (W, Natural (IndexesT (J + 1) - IndexesT (J)));
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end loop;
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return W;
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end Width_Enumeration_16;
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--------------------------
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-- Width_Enumeration_32 --
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--------------------------
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function Width_Enumeration_32
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(Names : String;
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Indexes : System.Address;
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Lo, Hi : Natural)
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return Natural
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is
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pragma Warnings (Off, Names);
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W : Natural;
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type Natural_32 is range 0 .. 2 ** 31 - 1;
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type Index_Table is array (Natural) of Natural_32;
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type Index_Table_Ptr is access Index_Table;
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function To_Index_Table_Ptr is
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new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
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IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
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begin
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W := 0;
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for J in Lo .. Hi loop
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W := Natural'Max (W, Natural (IndexesT (J + 1) - IndexesT (J)));
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end loop;
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return W;
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end Width_Enumeration_32;
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end System.Wid_Enum;
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