This routine decodes the value of a single component in a SCUBA data-spec. It is called by SCULIB_DECODE_SPEC. The component can be:-

• [1] "$\ast$" select all data

• [2] "$<$index$>$" select data at position $<$index$>$

• [3] "$<$index1$>$,$<$index2$>$" select data at positions $<$index1$>$ and $<$index2$>$

• [4] "$<$index1$>$:$<$index2$>$" select all data in the range $<$index1$>$ to $<$index2$>$

or any combination of 2, 3 and 4 separated by commas. Example component values are:-

• "$\ast$" select all data

• "1,5" select data at indices 1 and 5

• "5:10,16" select data at indices 5 through 10 and 16

Errors will occur if:-

• You mix the $\ast$ format with selection by index.

• Any index selected lies outside the range 1 to N.

• In a selection range $<$index2$>$ is less than $<$index1$>$.

• The component does not conform to the design syntax.

Output from the routine is in the form of a mask array SELECT. Data indices selected will be marked as 1 in SELECT, while indices not selected will be zeroes.

CALL SCULIB_DECODE_COMPONENT (COMPONENT, N, SELECT, STATUS)

COMPONENT = CHARACTER$\ast$($\ast$) (Given)

N = INTEGER (Given)

SELECT (N) = INTEGER (Returned)

STATUS = INTEGER (Given and Returned)

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