gcc/ada/s-commun.ads

   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
  34 with Ada.Streams;
  35 with System.CRTL;
  36
  37 package 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
  50 end System.Communication;