1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                 S Y S T E M . C O M M U N I C A T I O N                  --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--                     Copyright (C) 2001-2012, 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--  Common support unit for GNAT.Sockets and GNAT.Serial_Communication
33
34with Ada.Streams;
35with System.CRTL;
36
37package System.Communication is
38   pragma Preelaborate;
39
40   function Last_Index
41     (First : Ada.Streams.Stream_Element_Offset;
42      Count : CRTL.size_t) return Ada.Streams.Stream_Element_Offset;
43   --  Compute the Last OUT parameter for the various Read / Receive
44   --  subprograms: returns First + Count - 1.
45   --
46   --  When First = Stream_Element_Offset'First and Res = 0, Constraint_Error
47   --  is raised. This is consistent with the semantics of stream operations
48   --  as clarified in AI95-227.
49
50end System.Communication;
51