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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- S Y S T E M . M E M O R Y _ C O P Y --
--- --
--- S p e c --
--- --
--- Copyright (C) 2001-2009 Free Software Foundation, Inc. --
--- --
--- This specification is derived from the Ada Reference Manual for use with --
--- GNAT. The copyright notice above, and the license provisions that follow --
--- apply solely to the contents of the part following the private keyword. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 3, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. --
--- --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception, --
--- version 3.1, as published by the Free Software Foundation. --
--- --
--- You should have received a copy of the GNU General Public License and --
--- a copy of the GCC Runtime Library Exception along with this program; --
--- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
--- <http://www.gnu.org/licenses/>. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This package provides general block copy mechanisms analogous to those
--- provided by the C routines memcpy and memmove allowing for copies with
--- and without possible overlap of the operands.
-
--- The idea is to allow a configurable run-time to provide this capability
--- for use by the compiler without dragging in C-run time routines.
-
-with System.CRTL;
--- The above with is contrary to the intent ???
-
-package System.Memory_Copy is
- pragma Preelaborate;
-
- procedure memcpy (S1 : Address; S2 : Address; N : System.CRTL.size_t)
- renames System.CRTL.memcpy;
- -- Copies N storage units from area starting at S2 to area starting
- -- at S1 without any check for buffer overflow. The memory areas
- -- must not overlap, or the result of this call is undefined.
-
- procedure memmove (S1 : Address; S2 : Address; N : System.CRTL.size_t)
- renames System.CRTL.memmove;
- -- Copies N storage units from area starting at S2 to area starting
- -- at S1 without any check for buffer overflow. The difference between
- -- this memmove and memcpy is that with memmove, the storage areas may
- -- overlap (forwards or backwards) and the result is correct (i.e. it
- -- is as if S2 is first moved to a temporary area, and then this area
- -- is copied to S1 in a separate step).
-
- -- In the standard library, these are just interfaced to the C routines.
- -- But in the HI-E (high integrity version) they may be reprogrammed to
- -- meet certification requirements (and marked High_Integrity).
-
- -- Note that in high integrity mode these routines are by default not
- -- available, and the HI-E compiler will as a result generate implicit
- -- loops (which will violate the restriction No_Implicit_Loops).
-
-end System.Memory_Copy;