MdePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLib / CopyMemWrapper.c

/** @file\r
  CopyMem() implementation.\r
\r
  The following BaseMemoryLib instances contain the same copy of this file:\r
\r
    BaseMemoryLib\r
    BaseMemoryLibMmx\r
    BaseMemoryLibSse2\r
    BaseMemoryLibRepStr\r
    BaseMemoryLibOptDxe\r
    BaseMemoryLibOptPei\r
    PeiMemoryLib\r
    UefiMemoryLib\r
\r
  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "MemLibInternals.h"\r
\r
/**\r
  Copies a source buffer to a destination buffer, and returns the destination buffer.\r
\r
  This function copies Length bytes from SourceBuffer to DestinationBuffer, and returns\r
  DestinationBuffer.  The implementation must be reentrant, and it must handle the case\r
  where SourceBuffer overlaps DestinationBuffer.\r
\r
  If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().\r
  If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().\r
\r
  @param  DestinationBuffer   A pointer to the destination buffer of the memory copy.\r
  @param  SourceBuffer        A pointer to the source buffer of the memory copy.\r
  @param  Length              The number of bytes to copy from SourceBuffer to DestinationBuffer.\r
\r
  @return DestinationBuffer.\r
\r
**/\r
VOID *\r
EFIAPI\r
CopyMem (\r
  OUT VOID       *DestinationBuffer,\r
  IN CONST VOID  *SourceBuffer,\r
  IN UINTN       Length\r
  )\r
{\r
  if (Length == 0) {\r
    return DestinationBuffer;\r
  }\r
  ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer));\r
  ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer));\r
\r
  if (DestinationBuffer == SourceBuffer) {\r
    return DestinationBuffer;\r
  }\r
  return InternalMemCopyMem (DestinationBuffer, SourceBuffer, Length);\r
}\r