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HPFMOVEDATALTOR

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Edition 7 E0701
Edition 7 E0300 ♥
Edition 6 E0195

NM callable only.

This routine can be used to efficiently move data from a source buffer to a target buffer. If the source and target buffers were viewed horizontally, like a line of text, the data movement is performed by starting at leftmost position of the source buffer (to the leftmost position of the target buffer) and proceeding to the rightmost.

Syntax


                   I64    @64         @64         I32
  HPFMOVEDATALTOR (count, source_ptr, target_ptr, status);

Parameters

count

64-bit signed integer by reference (required)

The count parameter allows the caller to specify the number of bytes to move from the source buffer to the target buffer.

source_ptr

64-bit pointer by value (required)

The source_ptr can be a 64-bit pointer to any valid object that the calling process has access to. The buffer may be in the caller's stack, heap, or obtained by opening a file with user mapped access

target_ptr

64-bit pointer by value (required)

The target_ptr can be a 64-bi pointer to any valid object that the calling process has access to. The buffer may be in the caller's stack, heap, or obtained by opening a file with user mapped access.

status

32-bit signed integer by reference (optional)

Returns the status of the HPFMOVEDATALTOR call. If no errors or warnings are encountered, status returns 32 bits of zero. If errors or warnings are encountered, status is interpretted as two 16-bit fields. Bits (0:16) comprise status.info. A negative value indicates an error condition, and a positive value indicates a warning condition. Bits (16:16) comprise status.subsys. The value represents the subsystem that set the status information.

Operation Notes

This intrinsic is especially useful when the source and target buffers are overlapping. The HPFMOVEDATALTOR intrinsic is typically used when the target buffer's address is to the left (smaller) of the source buffer's address. Moving the data from the left to the right ensures that the data in the source buffer is copied to the target buffer before it is overwritten itself.

Related Information

Manual

Accessing Files Programmer's Guide



HPFMOVEDATA

HPFMOVEDATARTOL