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NM callable only.
This routine can be used to efficiently move data from a source buffer to a
target buffer.
Syntax
I64 @64 @64 I32
HPFMOVEDATA (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 proceThis intrinsic is especially useful when the source
and target buffers are overlapping. The HPFMOVEDATARTOL intrinsic
is typically used when the target buffer's address is to
the right (larger) of the source buffer's address. Moving
the data from the right to the left ensures that the data in the
source buffer is copied to the target buffer before it is overwritten
itselfss 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 HPFMOVEDATA 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
When calling the HPFMOVEDATA intrinsic it is important to
ensure that the source and target buffers are not overlapping. The
results of a HPFMOVEDATA call when source and target buffers are
overlapping are undefined. If source and target buffers are overlapping, the
HPFMOVEDATALTOR or HPFMOVEDATARTOL intrinsics should be used.
Related Information
- Manual
Accessing Files Programmer's Guide
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