1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                G N A T . C O M P I L E R _ V E R S I O N                 --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--                     Copyright (C) 2002-2018, AdaCore                     --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
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--  This package provides a routine for obtaining the version number of the
33--  GNAT compiler used to compile the program. It relies on the generated
34--  constant in the binder generated package that records this information.
35
36package body GNAT.Compiler_Version is
37
38   Ver_Len_Max : constant := 256;
39   --  This is logically a reference to Gnatvsn.Ver_Len_Max but we cannot
40   --  import this directly since run-time units cannot WITH compiler units.
41
42   Ver_Prefix : constant String := "GNAT Version: ";
43   --  This is logically a reference to Gnatvsn.Ver_Prefix but we cannot
44   --  import this directly since run-time units cannot WITH compiler units.
45
46   GNAT_Version : constant String (1 .. Ver_Len_Max + Ver_Prefix'Length);
47   pragma Import (C, GNAT_Version, "__gnat_version");
48
49   -------------
50   -- Version --
51   -------------
52
53   function Version return String is
54   begin
55      --  Search for terminating right paren or NUL ending the string
56
57      for J in Ver_Prefix'Length + 1 .. GNAT_Version'Last loop
58         if GNAT_Version (J) = ')' then
59            return GNAT_Version (Ver_Prefix'Length + 1 .. J);
60         end if;
61
62         if GNAT_Version (J) = Character'Val (0) then
63            return GNAT_Version (Ver_Prefix'Length + 1 .. J - 1);
64         end if;
65      end loop;
66
67      --  This should not happen (no right paren or NUL found)
68
69      return GNAT_Version;
70   end Version;
71
72end GNAT.Compiler_Version;
73