| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUNTIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . W I D _ E N U M -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- $Revision: 1.9 $ |
| -- -- |
| -- Copyright (C) 1992-2000 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. -- |
| -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| 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 |
| 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 |
| 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 |
| 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; |
