1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- S Y S T E M . W I D _ E N U M --
11 -- Copyright (C) 1992-2000 Free Software Foundation, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNAT was originally developed by the GNAT team at New York University. --
32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 with Unchecked_Conversion
;
38 package body System
.Wid_Enum
is
40 -------------------------
41 -- Width_Enumeration_8 --
42 -------------------------
44 function Width_Enumeration_8
46 Indexes
: System
.Address
;
52 type Natural_8
is range 0 .. 2 ** 7 - 1;
53 type Index_Table
is array (Natural) of Natural_8
;
54 type Index_Table_Ptr
is access Index_Table
;
56 function To_Index_Table_Ptr
is
57 new Unchecked_Conversion
(System
.Address
, Index_Table_Ptr
);
59 IndexesT
: constant Index_Table_Ptr
:= To_Index_Table_Ptr
(Indexes
);
64 for J
in Lo
.. Hi
loop
65 W
:= Natural'Max (W
, Natural (IndexesT
(J
+ 1) - IndexesT
(J
)));
69 end Width_Enumeration_8
;
71 --------------------------
72 -- Width_Enumeration_16 --
73 --------------------------
75 function Width_Enumeration_16
77 Indexes
: System
.Address
;
83 type Natural_16
is range 0 .. 2 ** 15 - 1;
84 type Index_Table
is array (Natural) of Natural_16
;
85 type Index_Table_Ptr
is access Index_Table
;
87 function To_Index_Table_Ptr
is
88 new Unchecked_Conversion
(System
.Address
, Index_Table_Ptr
);
90 IndexesT
: constant Index_Table_Ptr
:= To_Index_Table_Ptr
(Indexes
);
95 for J
in Lo
.. Hi
loop
96 W
:= Natural'Max (W
, Natural (IndexesT
(J
+ 1) - IndexesT
(J
)));
100 end Width_Enumeration_16
;
102 --------------------------
103 -- Width_Enumeration_32 --
104 --------------------------
106 function Width_Enumeration_32
108 Indexes
: System
.Address
;
114 type Natural_32
is range 0 .. 2 ** 31 - 1;
115 type Index_Table
is array (Natural) of Natural_32
;
116 type Index_Table_Ptr
is access Index_Table
;
118 function To_Index_Table_Ptr
is
119 new Unchecked_Conversion
(System
.Address
, Index_Table_Ptr
);
121 IndexesT
: constant Index_Table_Ptr
:= To_Index_Table_Ptr
(Indexes
);
126 for J
in Lo
.. Hi
loop
127 W
:= Natural'Max (W
, Natural (IndexesT
(J
+ 1) - IndexesT
(J
)));
131 end Width_Enumeration_32
;