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recursion.cbl
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recursion.cbl
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******************************************************************
* Author:
* Date:
* Purpose:
* Tectonics: cobc
******************************************************************
IDENTIFICATION DIVISION.
PROGRAM-ID. RECURSION.
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT OPTIONAL CALL-STACK ASSIGN TO "stack.dat"
ORGANIZATION IS INDEXED
ACCESS IS RANDOM
RECORD KEY IS COMMAND-ID.
DATA DIVISION.
FILE SECTION.
FD CALL-STACK.
01 CALL-STACK-FILE.
02 COMMAND-ID PIC 9(5).
02 COMMAND-NAME PIC X(20).
02 COMMAND-RESULT PIC X(20).
02 COMMAND-RESULT-NUMERIC
REDEFINES COMMAND-RESULT PIC 9(20).
02 COMMAND-RETURN-ID PIC 9(5).
02 COMMAND-RETURNS-RESULT PIC X.
88 COMMAND-RETURNS-RESULT-YES VALUE 'Y', FALSE 'N'.
WORKING-STORAGE SECTION.
01 WS-CALL-STACK-FILE-STATUS PIC X.
88 WS-CALL-STACK-FILE-STATUS-OPEN VALUE 'Y', FALSE 'N'.
01 WS-CALL-STACK.
02 WS-COMMAND-ID PIC 9(5).
02 WS-COMMAND-NAME PIC X(20).
02 WS-COMMAND-RESULT PIC X(20).
02 WS-COMMAND-RESULT-NUMERIC
REDEFINES WS-COMMAND-RESULT PIC 9(20).
02 WS-COMMAND-RETURN-ID PIC 9(5).
02 WS-COMMAND-RETURN-VALUE PIC X(20).
02 WS-COMMAND-RETURNS-RESULT PIC X.
88 WS-COMMAND-RETURNS-RESULT-YES VALUE 'Y', FALSE 'N'.
01 WS-CALL-STACK-EOF PIC A(1).
01 WS-CALL-STACK-NEXT-ID PIC 9(5).
01 WS-IS-LAST-EXPRESSION PIC X.
88 WS-IS-LAST-EXPRESSION-YES VALUE 'Y', FALSE 'N'.
01 WS-RETURN.
02 WS-RETURN-VALUE PIC X(20).
02 WS-RETURN-VALUE-NUMERIC PIC 9(20).
01 WS-STACK-STATUS.
02 WS-LAST-ID PIC 9(5).
02 WS-OLDEST-ID PIC 9(5).
02 WS-STACK-IS-EMPTY PIC X.
88 WS-STACK-IS-EMPTY-YES VALUE 'Y', FALSE 'N'.
*****************************************
* WS Shared with LOGGER SubRoutine
*****************************************
01 WS-LOG-OPERATION-FLAG PIC X(5).
01 WS-LOG-RECORD.
02 WS-LOG-RECORD-FUNCTION-NAME PIC X(40).
02 WS-LOG-RECORD-MESSAGE PIC X(100).
LINKAGE SECTION.
01 LS-RECURSION-FLAG PIC X(30).
01 LS-RECURSION-OBJECT.
02 LS-COMMAND-NAME PIC X(20).
02 LS-COMMAND-RESULT PIC X(20).
02 LS-COMMAND-RESULT-NUMERIC
REDEFINES LS-COMMAND-RESULT PIC 9(20).
02 LS-COMMAND-RETURNS-RESULT PIC X.
88 LS-COMMAND-RETURNS-RESULT-YES VALUE 'Y', FALSE 'N'.
PROCEDURE DIVISION USING LS-RECURSION-FLAG, LS-RECURSION-OBJECT.
MAIN-PROCEDURE.
EVALUATE LS-RECURSION-FLAG
WHEN "INIT"
PERFORM INIT-CALL-STACK-PROCEDURE
PERFORM LOG-INIT-CALL-STACK
WHEN "ADD-TO-CALL-STACK"
PERFORM CALL-STACK-ADD-PROCEDURE
PERFORM LOG-ADD-TO-CALL-STACK
WHEN "PEEK"
PERFORM CALL-STACK-GET-TOP-PROCEDURE
PERFORM LOG-PEEK-CALL-STACK
WHEN "POP-CALL-STACK"
PERFORM LOG-POP-FROM-CALL-STACK
PERFORM POP-CALL-STACK-PROCEDURE
WHEN "IS-EMPTY"
PERFORM IS-STACK-EMPTY-PROCEDURE
PERFORM LOG-IS-EMPTY-CALL-STACK
WHEN "PRINT-CALL-STACK"
PERFORM PRINT-CALL-STACK-PROCEDURE
WHEN "CLOSE"
PERFORM CLOSE-CALL-STACK-PROCEDURE
PERFORM LOG-CLOSE-CALL-STACK
WHEN "STACK-FILE-STATUS"
PERFORM CHECK-FILE-STATUS-PROCEDURE.
GOBACK.
LOG-INIT-CALL-STACK.
MOVE "ADD" TO WS-LOG-OPERATION-FLAG.
MOVE "RECURSION:INIT" TO WS-LOG-RECORD-FUNCTION-NAME.
MOVE "Initialized Call Stack" TO WS-LOG-RECORD-MESSAGE.
CALL 'LOGGER' USING WS-LOG-OPERATION-FLAG, WS-LOG-RECORD.
LOG-ADD-TO-CALL-STACK.
*******logging Adding to CALL-STACK
MOVE 'RECURSION:ADD-TO-CALL-STACK'
TO WS-LOG-RECORD-FUNCTION-NAME.
STRING COMMAND-ID DELIMITED BY SIZE
COMMAND-NAME DELIMITED BY SIZE
COMMAND-RETURN-ID DELIMITED BY SIZE
INTO WS-LOG-RECORD-MESSAGE.
MOVE "ADD" TO WS-LOG-OPERATION-FLAG.
CALL 'LOGGER' USING WS-LOG-OPERATION-FLAG, WS-LOG-RECORD.
LOG-PEEK-CALL-STACK.
*******logging Adding to CALL-STACK
MOVE 'RECURSION:GET-TOP-CALL-STACK'
TO WS-LOG-RECORD-FUNCTION-NAME.
STRING COMMAND-ID DELIMITED BY SIZE
COMMAND-NAME DELIMITED BY SIZE
COMMAND-RETURN-ID DELIMITED BY SIZE
INTO WS-LOG-RECORD-MESSAGE.
MOVE "ADD" TO WS-LOG-OPERATION-FLAG.
CALL 'LOGGER' USING WS-LOG-OPERATION-FLAG, WS-LOG-RECORD.
LOG-POP-FROM-CALL-STACK.
MOVE 'RECURSION:POP-CALL-STACK'
TO WS-LOG-RECORD-FUNCTION-NAME.
STRING COMMAND-ID DELIMITED BY SIZE
COMMAND-NAME DELIMITED BY SIZE
COMMAND-RETURN-ID DELIMITED BY SIZE
INTO WS-LOG-RECORD-MESSAGE.
MOVE "ADD" TO WS-LOG-OPERATION-FLAG.
CALL 'LOGGER' USING WS-LOG-OPERATION-FLAG, WS-LOG-RECORD.
LOG-IS-EMPTY-CALL-STACK.
MOVE 'RECURSION:IS-EMPTY-CALL-STACK'
TO WS-LOG-RECORD-FUNCTION-NAME.
MOVE WS-STACK-IS-EMPTY TO WS-LOG-RECORD-MESSAGE.
MOVE "ADD" TO WS-LOG-OPERATION-FLAG.
CALL 'LOGGER' USING WS-LOG-OPERATION-FLAG, WS-LOG-RECORD.
LOG-CLOSE-CALL-STACK.
*******logging Adding to CALL-STACK
MOVE 'RECURSION:CLOSE-CALL-STACK'
TO WS-LOG-RECORD-FUNCTION-NAME.
MOVE "Closed call-stack file" TO WS-LOG-RECORD-MESSAGE.
MOVE "ADD" TO WS-LOG-OPERATION-FLAG.
CALL 'LOGGER' USING WS-LOG-OPERATION-FLAG, WS-LOG-RECORD.
LOG-DELETE-FROM-CALL-STACK.
*******logging Deleting from CALL-STACK
MOVE 'RECURSION:DELETE-FROM-CALL-STACK'
TO WS-LOG-RECORD-FUNCTION-NAME.
STRING COMMAND-ID DELIMITED BY SIZE
COMMAND-NAME DELIMITED BY SIZE
COMMAND-RETURN-ID DELIMITED BY SIZE
INTO WS-LOG-RECORD-MESSAGE.
MOVE "ADD" TO WS-LOG-OPERATION-FLAG.
CALL 'LOGGER' USING WS-LOG-OPERATION-FLAG, WS-LOG-RECORD.
INIT-CALL-STACK-PROCEDURE.
* Preventing the error of something already being in the
* stack file after a system crash
OPEN OUTPUT CALL-STACK.
CLOSE CALL-STACK.
* Actually opening the call-stack for writing.
OPEN I-O CALL-STACK.
MOVE 1 TO WS-CALL-STACK-NEXT-ID.
MOVE 1 TO WS-OLDEST-ID.
MOVE 1 TO WS-LAST-ID.
SET WS-STACK-IS-EMPTY-YES TO TRUE.
SET WS-CALL-STACK-FILE-STATUS-OPEN TO TRUE.
CLOSE-CALL-STACK-PROCEDURE.
CLOSE CALL-STACK.
DELETE FILE CALL-STACK.
SET WS-CALL-STACK-FILE-STATUS-OPEN TO FALSE.
CALL-STACK-ADD-PROCEDURE.
MOVE WS-CALL-STACK-NEXT-ID TO COMMAND-ID.
MOVE LS-COMMAND-NAME TO COMMAND-NAME.
MOVE LS-COMMAND-RESULT TO COMMAND-RESULT.
MOVE LS-COMMAND-RETURNS-RESULT TO COMMAND-RETURNS-RESULT.
MOVE WS-LAST-ID TO COMMAND-RETURN-ID.
WRITE CALL-STACK-FILE.
IF WS-STACK-IS-EMPTY-YES THEN
MOVE WS-CALL-STACK-NEXT-ID TO WS-OLDEST-ID
SET WS-STACK-IS-EMPTY-YES TO FALSE
END-IF.
MOVE WS-CALL-STACK-NEXT-ID TO WS-LAST-ID.
ADD 1 TO WS-CALL-STACK-NEXT-ID.
PRINT-CALL-STACK-PROCEDURE.
DISPLAY "PRINT-CALL-STACK-PROCEDURE".
DISPLAY "ID "
"NAME "
"RESULT " "RESULT (NUMERIC) "
" RETURN ID ".
PERFORM VARYING COMMAND-ID FROM 1 BY 1
UNTIL COMMAND-ID = WS-CALL-STACK-NEXT-ID
READ CALL-STACK RECORD INTO WS-CALL-STACK
KEY IS COMMAND-ID
INVALID KEY DISPLAY "DELETED"
END-READ
DISPLAY WS-COMMAND-ID " " WS-COMMAND-NAME
" " WS-COMMAND-RESULT " " WS-COMMAND-RESULT-NUMERIC " "
WS-COMMAND-RETURN-ID " " WS-COMMAND-RETURN-VALUE " "
WS-COMMAND-RETURNS-RESULT
END-PERFORM.
CALL-STACK-GET-TOP-PROCEDURE.
MOVE WS-LAST-ID TO COMMAND-ID.
READ CALL-STACK RECORD
KEY IS COMMAND-ID
END-READ.
MOVE COMMAND-NAME TO LS-COMMAND-NAME.
MOVE COMMAND-RESULT TO LS-COMMAND-RESULT.
POP-CALL-STACK-PROCEDURE.
MOVE WS-LAST-ID TO COMMAND-ID.
D DISPLAY "FROM POP-CALL-STACK-PROCEDURE:" COMMAND-ID.
READ CALL-STACK RECORD.
MOVE COMMAND-NAME TO LS-COMMAND-NAME.
MOVE COMMAND-RESULT TO LS-COMMAND-RESULT.
MOVE COMMAND-RETURN-ID TO WS-LAST-ID.
DELETE CALL-STACK RECORD.
IF COMMAND-ID = WS-OLDEST-ID THEN
SET WS-STACK-IS-EMPTY-YES TO TRUE
END-IF.
D DISPLAY "DELETED:" COMMAND-ID " GOTO:" WS-LAST-ID.
DISPLAY " ".
IS-STACK-EMPTY-PROCEDURE.
IF WS-STACK-IS-EMPTY-YES THEN
MOVE "STACK-EMPTY" TO LS-RECURSION-FLAG
ELSE
MOVE "NOT-EMPTY" TO LS-RECURSION-FLAG
END-IF.
CHECK-FILE-STATUS-PROCEDURE.
MOVE WS-CALL-STACK-FILE-STATUS TO LS-RECURSION-FLAG.
END PROGRAM RECURSION.