File : s-imgenu.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M . I M G _ E N U M --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 2000-2013, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
17 -- --
18 -- --
19 -- --
20 -- --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 pragma Compiler_Unit_Warning;
33
34 with Ada.Unchecked_Conversion;
35
36 package body System.Img_Enum is
37
38 -------------------------
39 -- Image_Enumeration_8 --
40 -------------------------
41
42 function Image_Enumeration_8
43 (Pos : Natural;
44 Names : String;
45 Indexes : System.Address)
46 return String
47 is
48 type Natural_8 is range 0 .. 2 ** 7 - 1;
49 type Index_Table is array (Natural) of Natural_8;
50 type Index_Table_Ptr is access Index_Table;
51
52 function To_Index_Table_Ptr is
53 new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
54
55 IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
56
57 Start : constant Natural := Natural (IndexesT (Pos));
58 Next : constant Natural := Natural (IndexesT (Pos + 1));
59
60 subtype Result_Type is String (1 .. Next - Start);
61 -- We need this result type to force the result to have the
62 -- required lower bound of 1, rather than the slice bounds.
63
64 begin
65 return Result_Type (Names (Start .. Next - 1));
66 end Image_Enumeration_8;
67
68 --------------------------
69 -- Image_Enumeration_16 --
70 --------------------------
71
72 function Image_Enumeration_16
73 (Pos : Natural;
74 Names : String;
75 Indexes : System.Address)
76 return String
77 is
78 type Natural_16 is range 0 .. 2 ** 15 - 1;
79 type Index_Table is array (Natural) of Natural_16;
80 type Index_Table_Ptr is access Index_Table;
81
82 function To_Index_Table_Ptr is
83 new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
84
85 IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
86
87 Start : constant Natural := Natural (IndexesT (Pos));
88 Next : constant Natural := Natural (IndexesT (Pos + 1));
89
90 subtype Result_Type is String (1 .. Next - Start);
91 -- We need this result type to force the result to have the
92 -- required lower bound of 1, rather than the slice bounds.
93
94 begin
95 return Result_Type (Names (Start .. Next - 1));
96 end Image_Enumeration_16;
97
98 --------------------------
99 -- Image_Enumeration_32 --
100 --------------------------
101
102 function Image_Enumeration_32
103 (Pos : Natural;
104 Names : String;
105 Indexes : System.Address)
106 return String
107 is
108 type Natural_32 is range 0 .. 2 ** 31 - 1;
109 type Index_Table is array (Natural) of Natural_32;
110 type Index_Table_Ptr is access Index_Table;
111
112 function To_Index_Table_Ptr is
113 new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
114
115 IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
116
117 Start : constant Natural := Natural (IndexesT (Pos));
118 Next : constant Natural := Natural (IndexesT (Pos + 1));
119
120 subtype Result_Type is String (1 .. Next - Start);
121 -- We need this result type to force the result to have the
122 -- required lower bound of 1, rather than the slice bounds.
123
124 begin
125 return Result_Type (Names (Start .. Next - 1));
126 end Image_Enumeration_32;
127
128 end System.Img_Enum;