gcc/ada/s-commun.adb

   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 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                     Copyright (C) 2001-2009, 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 package body System.Communication is
  33
  34    subtype SEO is Ada.Streams.Stream_Element_Offset;
  35
  36    ----------------
  37    -- Last_Index --
  38    ----------------
  39
  40    function Last_Index
  41      (First : Ada.Streams.Stream_Element_Offset;
  42       Count : CRTL.size_t) return Ada.Streams.Stream_Element_Offset
  43    is
  44       use type Ada.Streams.Stream_Element_Offset;
  45       use type System.CRTL.size_t;
  46    begin
  47       if First = SEO'First and then Count = 0 then
  48          raise Constraint_Error with
  49            "last index out of range (no element transferred)";
  50       else
  51          return First + SEO (Count) - 1;
  52       end if;
  53    end Last_Index;
  54
  55 end System.Communication;