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decuslib10-01
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43,50150/ifile.300
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TITLE IFILE - OFILE ROUTINE FOR DOING LOOKUPS FROM FORTRAN
SUBTTL 21-APR-69
;
;MODIFIED FOR SNOBOL TO HANDLE PPNS L.P. WADE 9-8-70
;
ENTRY IFILE
ENTRY OFILE
ENTRY FILNMQ
;
;
;
; SEQUENCES BELOW MODIFIED FOR PPNS BY CHECKING
; WHETHER THE 3RD AND 4TH ARGUMENTS EXIST. IF SO THEY ARE
; ASSUMED TO BE OCTAL PROJECT-PROGRAMMER NUMBERS.
;
; THIS ALLOWS SYNTAX LIKE
;
; LPT:_SYS:COMMON,DSK:[30,112]FOOBAR,DSK:FOO
;
; OR
; IFILE(20,'NAME.FOO',30,112)
;
;IFILE CALLING SEQUENCE
;
; JSA 16,IFILE
; ARG 0,A1
; ARG 5,A2
;OR
; JSA 16,IFILE
; ARG 0,A1
; ARG N,A3
;OR
; JSA 16,IFILE
; ARG 0,A1
; ARG N,A4
; ARG N,A5
;
;WHERE
; A1 - ADDRESS OF FORTRAN LOGICAL UNIT NUMBER
; A2 - ADDRESS OF 1 OR 2 WORD LITERAL SPECIFING FILE NAME
; A3 - ADDRESS OF IDENTIFIER SPECIFING FILE NAME IN ONE WORD
; A4,A5 - ADDRESS OF TWO IDENTIFIERS SPECIFYING FILE NAME
;
;THE FILE NAME AND EXTENSION MUST BE TYPED WITH NO IMBEDDED BLANKS
;AND WITH A PERIOD SEPARATING THE FILENAME AND EXTENSION.
;
;OFILE IS CALLED IN THE SAME WAYS AS IFILE.
;
;IFILE RESULTS EVENTUALLY IN A 'LOOKUP'.
;OFILE RESULTS EVENTUALLY IN AN 'ENTER'.
;
INF.=26B8
OUTF.=27B8
JUMPAR=320
P=17
IFILE: 0
PUSHJ P,KJ1
INF: INF. 0,INF ;ADDRESS IS MODIFIED.
JRA 16,2(16) ;RETURN
OFILE: 0
PUSHJ P,KJ1
OUTF: OUTF. 0,OUTF ;ADRESS IS MODIFIED.
JRA 16,2(16) ;RETURN
FILNMQ: 0
PUSHJ P,.+2
JRST KJ9
PUSH P,1
PUSH P,2
SUBI 16,1
JRST KJ8
KJ9: PUSH P,1
HRRZ 1,3(16)
MOVE TEMP
MOVEM (1)
MOVE TEMP+1
MOVEM 1(1)
POP P,1
JRA 16,3(16)
KJ1: PUSH P,1 ;SAVE THE ACCUMULATORS
PUSH P,2
MOVE 0,@(16) ;GET FORTRAN LOGICAL UNIT NUMBER.
HRRM 0,INF ;AND DEPOSIT IT IN THE UUO'S
HRRM 0,OUTF
KJ8: CLEARM TEMP ;CLEAR SIXBIT FILE NAME
CLEARM TEMP+1 ;AND EXTENSION
CLEARM TEMP+2 ;CLEAR PROJECT
CLEARM TEMP+3 ;CLEAR PROGRAMMER NO.
MOVE 1,1(16) ;GET ADDRESS AND TYPE OF 2ND ARGUMENT.
LDB 0,[POINT 4,1,12] ;EXTRACT ARGUMENT TYPE.
CAIE 0,5 ;IS IT A LITERAL?
JRST KJ2 ;NO, GO SEE WHICH CALL WE HAVE.
MOVE 0,1(1) ;YES MOVE LITERAL TO BUFFER.
KJ3: MOVEM 0,FN+1 ;IF ONE WORD, THEN 2ND WORD WILL BE ALL ZERO.
MOVE 0,(1)
MOVEM 0,FN
DOIT: MOVE 1,[POINT 7,FN] ;POINTS TO ASCII FILE NAME.
MOVE 2,[POINT 6,TEMP] ;PTR TO SIXBIT FILE NAME.
KJ6: PUSHJ P,GETBYT
CAIG 0,57 ;CHECK FOR BREAK CHAR.
JRST KJ4 ;YES
PUSHJ P,PUTBYT ;NO, ADD TO FILE NAME
JRST KJ6 ;LOOP FOR NEXT BYTE
KJ4: CLEARM TEMP+1 ;IN CASE WE GOT OVER 6 CHAR. IN F. N.
MOVE 2,[POINT 6,TEMP+1] ;PTR FOR 6BIT EXT.
KJ7: PUSHJ P,GETBYT
PUSHJ P,PUTBYT ;PUT IT IN EXTENSION
JRST KJ7 ;LOOP FOR NXT. BYTE.
GETBYT: TLNE 1,760000 ;HAVE 5 CHAR. BEEN PICKED FROM WORD?
JRST KJ5 ;NO, GO GET NEXT BYTE.
CAMN 1,[POINT 7,FN+1,34] ;YES, IS IT 2ND WORD?
JRST UUOCAL ;YES, GO DO UUO CALL.
KJ5: ILDB 0,1 ;GET NEXT ASCII BYTE.
POPJ P, ;RETURN FROM GET BYTE.
PUTBYT: CAIG 0,57 ;SLOUGH BREAKS WHEN DOING EXTENSION.
POPJ P, ;RETURN SLOUGHING BREAK CHAR.
TRC 0,40 ;CONVERT TO SIXBIT.
IDPB 0,2 ;
CAME 2,[POINT 6,TEMP+1,17] ;DON'T GO PAST 3 CHAR. EXT.
POPJ P, ;RETURN FROM PUTBYT.
;NXT INST. MUST FOLLOW PUTBYT RETURN....
UUOCAL: POP P,0 ;POP DEAD RETURN FROM STACK
;
; FOLLOWING ADDED FOR PPN HANDLING
;
LDB 1,[POINT 9,2(16),8]
CAIE 1,JUMPAR
JRST UUO1 ;NOT 'ARG'
MOVE 1,@2(16)
MOVEM 1,TEMP+3
UUO1:
;
; END OF PPN CHANGE
HRRZI 0,TEMP ;AC0 CONTAINS ADDRESS OF F. N.
POP P,2 ;RESTORE AC'S
POP P,1
POPJ P, ;RETURN TO DO PROPER UUO CALL.
KJ2: HLRZI 0,0 ;PUT ZERO IN AC0.
MOVE 2,2(16) ;CHECK FOR THREE ARGUMENTS.
TLCE 2,320000 ;IS THIRD WORD A NOOP?
TLNE 2,777000 ;MAYBE - LOOK CLOSER.
JRST KJ3 ;NO CHANCE USE ZERO FOR 2ND WORD.
MOVE 0,(2) ;DEFINITELY YES, GET SECOND ARG.
JRST KJ3 ;AND MOVE TO BUFFER.
;
;
;DATA AREA....
;
;
FN: BLOCK 2 ;BUFFER FOR ASCII FILE NAME AND EXTENSION.
TEMP: BLOCK 4 ;BUFFER FOR SIXBIT FILE NAME AND EXTENSION.
END