12a37b2ae1
Unlike other string functions in this library, ZeroMem () does not return early when the length of the input buffer is 0. So add the same to ZeroMem () as well, for all implementations of BaseMemoryLib living under MdePkg/ This fixes an issue with the ARM implementation of BaseMemoryLibOPtDxe, whose InternalMemZeroMem code does not expect a length of 0, and always writes at least a single byte. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/** @file
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ZeroMem() implementation.
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The following BaseMemoryLib instances contain the same copy of this file:
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BaseMemoryLib
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BaseMemoryLibMmx
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BaseMemoryLibSse2
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BaseMemoryLibRepStr
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BaseMemoryLibOptDxe
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BaseMemoryLibOptPei
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PeiMemoryLib
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UefiMemoryLib
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "MemLibInternals.h"
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/**
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Fills a target buffer with zeros, and returns the target buffer.
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This function fills Length bytes of Buffer with zeros, and returns Buffer.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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@param Buffer The pointer to the target buffer to fill with zeros.
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@param Length The number of bytes in Buffer to fill with zeros.
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@return Buffer.
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**/
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VOID *
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EFIAPI
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ZeroMem (
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OUT VOID *Buffer,
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IN UINTN Length
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)
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{
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if (Length == 0) {
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return Buffer;
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}
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ASSERT (Buffer != NULL);
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ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));
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return InternalMemZeroMem (Buffer, Length);
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}
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