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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . W I D _ E N U M --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2001 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with 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 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 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 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;
|
