Define a key

CALL FFKEY (KEY, ADRESS, LENGTH, CHTYPE)

This subroutine actually defines a key to FFREAD. Its arguments have the following meaning:

KEY

character string containing the key to use (character)

ADRESS

variable/array to store values to (anything but character)

LENGTH

number of values associated with this key (integer)

CHTYPE

character string specifying the type of variable/array For the values 'INTE', 'REAL', or 'LOGI' (only four characters are significant), type checking as described above will be performed. If this argument has any other value, no type checking will be done.

KEY is truncated to the significant key length and converted to upper case.

If one of the following conditions is met,the key is not defined and an error message is issued:

• no space is available to define a new key
• the key is identical to a previously defined one
• LENGTH is not positive.