read-split <piece number> from <split string> to <piece> [ status <status> ]
read-split will read split string pieces from <split string> which is produced by split-string. <piece number> is the number (starting with 1) of the piece to retrieve in string <piece>. <status> number (in "status" clause) is GG_OKAY if successful, or GG_ERR_OVERFLOW if <piece number> is not valid (meaning it's outside of the range of pieces parsed by split-string).
