MdePkg/BaseMemoryLib*: check for zero length in ZeroMem ()

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibOptDxe / ZeroMemWrapper.c

/** @file\r
  ZeroMem() 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 - 2010, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php.\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "MemLibInternals.h"\r
\r
/**\r
  Fills a target buffer with zeros, and returns the target buffer.\r
\r
  This function fills Length bytes of Buffer with zeros, and returns Buffer.\r
  \r
  If Length > 0 and Buffer is NULL, then ASSERT().\r
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
\r
  @param  Buffer      The pointer to the target buffer to fill with zeros.\r
  @param  Length      The number of bytes in Buffer to fill with zeros.\r
\r
  @return Buffer.\r
\r
**/\r
VOID *\r
EFIAPI\r
ZeroMem (\r
  OUT VOID  *Buffer,\r
  IN UINTN  Length\r
  )\r
{\r
  if (Length == 0) {\r
    return Buffer;\r
  }\r
\r
  ASSERT (Buffer != NULL);\r
  ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));\r
  return InternalMemZeroMem (Buffer, Length);\r
}\r