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6.2.27.4 PERFORM with UNTIL Phrase
In the UNTIL phrase format, the procedure(s) referred to are performed until the condition specified by the UNTIL phrase is true. Control is then passed to the next executable statement following the PERFORM statement. 



    ___ Format 3 _________________________________________________________________ 
   |                                                                              |
   | >>__PERFORM__ _procedure-name-1__| phrase 1 |__| phrase 2 |_________ _____>< |
   |              |                                      (1)             |        |
   |              |_| phrase 2 |__imperative-statement-1_____END-PERFORM_|        |
   |                                                                              |
   | phrase 1:                                                                    |
   | |__ _______________________________ _______________________________________| |
   |    |_ _THROUGH_ __procedure-name-2_|                                         |
   |      |_THRU____|                                                             |
   |                                                                              |
   | phrase 2:                                                                    |
   | |__ ____________________________ __UNTIL__condition-1______________________| |
   |    |_ ______ __TEST__ _BEFORE_ _|                                            |
   |      |_WITH_|        |_AFTER__|                                              |
   |                                                                              |
   | Note:                                                                        |
 X | (1)  Imperative-statement-1 is optional as an IBM extension.                 |
   |                                                                              |
   |______________________________________________________________________________|
Note: If procedure-name-1 is specified, imperative-statement-1 and the END-PERFORM phrase must not be specified.
condition-1
Can be any condition described under "Conditional Expressions" in topic 6.1.6. If the condition is true at the time the PERFORM statement is initiated, the specified procedure(s) are not executed.
Any subscripting associated with the operands specified in condition-1 is evaluated each time the condition is tested.
If the TEST BEFORE phrase is specified or assumed, the condition is tested before any statements are executed (corresponds to DO WHILE).
If the TEST AFTER phrase is specified, the statements to be performed are executed at least once before the condition is tested (corresponds to DO UNTIL).
In either case, if the condition is true, control is transferred to the next executable statement following the end of the PERFORM statement. If neither the TEST BEFORE nor the TEST AFTER phrase is specified, the TEST BEFORE phrase is assumed.

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