(
c-addr u fileid --
ior )
Write
u characters from
c-addr to the file
identified by
fileid starting at its current position.
ior is the implementation-defined I/O result code.
At the conclusion of the operation,
FILE-POSITION returns
the next file position after the last character written to the
file, and
FILE-SIZE returns a value greater than or equal
to the value returned by
FILE-POSITION.