Skip leading space delimiters. Parse name delimited by a space. Create a definition for name with the execution semantics defined below. Return n3 = n1 + n2 where n1 is the offset in the data structure before +FIELD executes, and n2 is the size of the data to be added to the data structure. n1 and n2 are in address units.
Add n1 to addr1 giving addr2.
10.6.2.0893 CFIELD:, 10.6.2.1518 FIELD:, 18.104.22.1687 FFIELD:,
22.214.171.1246.40 SFFIELD:, 126.96.36.1997.40 DFFIELD:, A.10.6.2.0135 +FIELD.