mirror of https://github.com/acidanthera/audk.git
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/** @file
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ScanMem32() 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 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "MemLibInternals.h"
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/**
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Scans a target buffer for a 32-bit value, and returns a pointer to the matching 32-bit value
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in the target buffer.
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This function searches the target buffer specified by Buffer and Length from the lowest
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address to the highest address for a 32-bit value that matches Value. If a match is found,
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then a pointer to the matching byte in the target buffer is returned. If no match is found,
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then NULL is returned. If Length is 0, then NULL is returned.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Buffer is not aligned on a 32-bit boundary, then ASSERT().
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If Length is not aligned on a 32-bit boundary, 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 scan.
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@param Length The number of bytes in Buffer to scan.
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@param Value The value to search for in the target buffer.
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@return A pointer to the matching byte in the target buffer or NULL otherwise.
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**/
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VOID *
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EFIAPI
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ScanMem32 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT32 Value
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)
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{
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if (Length == 0) {
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return NULL;
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}
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ASSERT (Buffer != NULL);
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ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);
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ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
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ASSERT ((Length & (sizeof (Value) - 1)) == 0);
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return (VOID*)InternalMemScanMem32 (Buffer, Length / sizeof (Value), Value);
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}
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