#include "MemLibInternals.h"\r
\r
/**\r
- Copy Length bytes from Source to Destination.\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\r
- returns DestinationBuffer. The implementation must be reentrant, and it must\r
- handle the case where SourceBuffer overlaps DestinationBuffer.\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
+ 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
- If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then\r
- ASSERT().\r
- If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().\r
+ @param DestinationBuffer Pointer to the destination buffer of the memory copy.\r
+ @param SourceBuffer Pointer to the source buffer of the memory copy.\r
+ @param Length Number of bytes to copy from SourceBuffer to DestinationBuffer.\r
\r
- @param Destination Target of copy\r
- @param Source Place to copy from\r
- @param Length Number of bytes to copy\r
-\r
- @return Destination\r
+ @return DestinationBuffer.\r
\r
**/\r
VOID *\r
EFIAPI\r
CopyMem (\r
- OUT VOID *Destination,\r
- IN CONST VOID *Source,\r
- IN UINTN Length\r
+ OUT VOID *DestinationBuffer,\r
+ IN CONST VOID *SourceBuffer,\r
+ IN UINTN Length\r
)\r
{\r
- ASSERT (\r
- Destination == NULL ||\r
- Length <= MAX_ADDRESS - (UINTN)Destination + 1\r
- );\r
- ASSERT (\r
- Source == NULL ||\r
- Length <= MAX_ADDRESS - (UINTN)Source + 1\r
- );\r
- if (Destination == Source || Length == 0) {\r
- return Destination;\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 (Destination, Source, Length);\r
+ return InternalMemCopyMem (DestinationBuffer, SourceBuffer, Length);\r
}\r