=> R0 = 1 (put bytes to specified pointer)
2 (put bytes to current pointer)
R1 = internal file handle returned by FSEntry_Open
R2 = pointer to buffer
R3 = bytes to transfer
if R0 = 1
R4 = file pointer
<= R2 = pointer after end of data
R3 = number of bytes not transferred
R4 = new file pointer
This entry point is called to perform multiple byte writes on unbuffered files. If the specified pointer is beyond the current end of the file, then the area between the two must be filled with 0 bytes before the data is transferred. The file handle is guaranteed not to be a directory, and to have had write access at time of opening.
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