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pnz.mac
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TITLE PNZ FOR LIBOL V12.
SUBTTL DETERMINE IF A STRING IS POSITIVE, NEGATIVE OR ZERO /ACK
;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY ONLY BE USED
; OR COPIED IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
;
;COPYRIGHT (C) 1974, 1979 BY DIGITAL EQUIPMENT CORPORATION
;REVISION HISTORY:
;V10 *****
; 28-JAN-76 [424] FIX ZERO
; 19-DEC-74 /ACK CREATION.
; 5/15/75 /DBT/ BIS
;*****
SEARCH LBLPRM ;DEFINE PARAMETERS.
%%LBLP==:%%LBLP
EBCMP.==:EBCMP.
BIS==:BIS
EXTERN EASTB. ;FORCE EASTBL TO BE LOADED.
HISEG
COMMENT \
THIS ROUTINE IS USED TO DETERMINE IF A STRING IS POSITIVE OR
IF A STRING IS NEGATIVE OR IF A STRING IS ZERO.
CALL:
MOVEI 16,PARAMETER ADDRESS
PUSHJ 17,POS.6/POS.7/POS.9/NEG.6/NEG.7/NEG.9/ZERO.6/ZERO.7/ZERO.9
PARAMETERS:
BITS 0-5 BYTE POINTER RESIDUE FOR INPUT FIELD.
BIT 6 1 IF AN OPERATIONAL SIGN IS PRESENT.
BITS 7-17 SIZE OF THE INPUT FIELD.
BITS 18-35 ADDRESS OF THE FIRST CHARACTER OF THE INPUT FIELD.
RETURNS:
CALL+1 IF THE TEST FAILS.
CALL+2 IF THE TEST SUCCEEDS.
REGISTERS USED:
CH, T1 (ALIAS CH), T2, SW, JAC, PARM, CNT
\
IFE BIS,<
;LOCAL AC DEFINITIONS:
CPTR==PARM ;SO WE CAN USE GDSKP.
;THE POSITIVE TEST:
ENTRY POS.6 ;IF THE INPUT IS SIXBIT.
ENTRY POS.7 ;IF THE INPUT IS ASCII.
IFN EBCMP.,<
ENTRY POS.9 ;IF THE INPUT IS EBCDIC.
>
POS.6: JSP CH, POS ;ENTER HERE IF THE INPUT IS SIXBIT,
POS.7: JSP CH, POS ; HERE IF IT IS ASCII AND
IFN EBCMP.,<
POS.9: JSP CH, POS ; HERE IF IT IS EBCDIC.
>
POS: SUBI CH, POS.6-5 ;GET THE INPUT BYTE SIZE.
JSP T2, PNZ ;GO SEE WHAT THE INPUT IS LIKE.
AOSA (PP) ;POSITIVE - SKIP RETURN.
JUMPGE SW, RET.2 ;NEGATIVE - BUT IT MAY STILL BE
; POSITIVE, JUMP IF IT CAN'T
; HAVE A SIGN.
POPJ PP, ;ZERO RETURN.
;THE NEGATIVE TEST:
ENTRY NEG.6 ;IF THE INPUT IS SIXBIT.
ENTRY NEG.7 ;IF THE INPUT IS ASCII.
IFN EBCMP.,<
ENTRY NEG.9 ;IF THE INPUT IS EBCDIC.
>
NEG.6: JSP CH, NEG ;ENTER HERE IF THE INPUT IS SIXBIT,
NEG.7: JSP CH, NEG ; HERE IF IT IS ASCII AND
IFN EBCMP.,<
NEG.9: JSP CH, NEG ; HERE IF IT IS EBCDIC.
>
NEG: SUBI CH, NEG.6-5 ;GET THE INPUT BYTE SIZE.
JSP JAC, SET1. ;GO PICK UP THE PARAMETERS.
JUMPGE SW, RET.1 ;JUMP IF WE CAN'T HAVE A SIGN.
JSP T2, PNZ0 ;GO SEE WHAT THE INPUT IS LIKE.
POPJ PP, ;POSITIVE - NON-SKIP RETURN.
AOS (PP) ;NEGATIVE - SKIP RETURN.
POPJ PP, ;ZERO - NON-SKIP RETURN.
;THE ZERO TEST:
ENTRY ZERO.6 ;IF THE INPUT IS SIXBIT.
ENTRY ZERO.7 ;IF THE INPUT IS ASCII.
IFN EBCMP.,<
ENTRY ZERO.9 ;IF THE INPUT IS EBCDIC.
>
ZERO.6: JSP CH, ZERO ;ENTER HERE IF THE INPUT IS SIXBIT,
ZERO.7: JSP CH, ZERO ; HERE IF IT IS ASCII AND
IFN EBCMP.,<
ZERO.9: JSP CH, ZERO ; HERE IF IT IS EBCDIC.
>
ZERO: SUBI CH, ZERO.6-5 ;GET THE INPUT BYTE SIZE.
JSP T2, PNZ ;GO SEE WHAT THE INPUT IS LIKE.
POPJ PP, ;POSITIVE - NON-SKIP RETURN.
POPJ PP, ;NEGATIVE - NON-SKIP RETURN.
AOS (PP) ;ZERO - SKIP RETURN.
POPJ PP,
SUBTTL DETERMINE WHETHER A STRING IS POSITIVE, NEGATIVE OR ZERO.
COMMENT \
THIS SUBROUTINE DETERMINES WHETHER A STIRING IS POSITIVE, NEGATIVE
OR ZERO.
CALL:
JSP T2, PNZ
OR JSP T2, PNZ0
PARAMETERS:
IF ENTERING AT PNZ:
(CH) A CODE DESCRIBING THE INPUT:
6 ==: SIXBIT.
7 ==: ASCII.
8 ==: EBCDIC.
IF ENTERING AT PNZ0:
(SW) RH: A CODE DESCRIBING THE INPUT:
6 ==: SIXBIT.
7 ==: ASCII.
8 ==: EBCDIC.
(CNT) THE SIZE OF THE INPUT STRING.
(IPTR) THE POINTER TO THE INPUT STRING.
RETURNS:
CALL+1 IF THE STRING IS POSITIVE.
CALL+2 IF THE STRING IS NEGATIVE.
CALL+3 IF THE STRING IS ZERO.
REGISTERS USED:
CH, T1 (ALIAS CH), SW, JAC, PARM, CNT
\
EXTERN GDSKP. ;ROUTINE TO SKIP LEADING CHARS.
EXTERN SET1. ;ROUTINE TO SET UP THE PARAMETERS.
EXTERN RET.1 ;RETURNS TO CALL+1.
EXTERN RET.2 ;RETURNS TO CALL+2.
EXTERN IBNCH. ;IMBEDDED "-" FLAG.
EXTERN SPCCH. ;SPECIAL CHAR FLAG.
EXTERN PTRNM. ;TABLE OF POINTERS TO FLAGS AND
; NUMERIC REPRESENTATIONS.
PNZ: JSP JAC, SET1. ;GO PICK UP THE PARAMETERS.
PNZ0: MOVE CPTR, PTRNM.-6(SW) ;SELECT THE APPROPRIATE CONVERSION
; POINTER.
JSP JAC, GDSKP. ;GO SKIP OVER LEADING CHARS.
Z 2(T2) ;RETURN THROUGH HERE IF THERE
; ARE NO SIGNIFICANT CHARS (IE.
; THE FIELD IS ZERO.)
EXP PNZ4 ;RETURN THROUGH HERE IF WE FOUND
; A NON-SPECIAL CHAR.
EXP PNZ3 ;RETURN THROUGH HERE IF WE FOUND
; A SPECIAL CHAR.
;RETURN TO HERE IF WE FOUND A LEADING SIGN.
JRST PNZ1A ;DON'T GET THE NEXT CHAR, WE
; ALREADY HAVE IT FROM GDSKP.
PNZ1: ILDB CH, IPTR ;GET THE NEXT CHAR.
LDB T1, CPTR ;CONVERT IT AND PICK UP FLAGS.
PNZ1A: TRZE T1, SPCCH. ;SPECIAL CHAR?
JRST PNZ3 ;YES, GO SEE WHAT TO DO.
JUMPN T1, PNZ4 ;JUMP IF THE CHAR WAS NOT ZERO.
PNZ2: SOJG CNT, PNZ1 ;LOOP IF THER ARE MORE CHARS.
JRST 2(T2) ;VALUE IS ZERO - RETURN TO CALL+3.
;SAW A SPECIAL CHAR.
PNZ3: TRZN T1, IBNCH. ;IMBEDDED "-" SIGN?
JUMPN T1, 2(T2) ;NO, IF NOT NULL, VALUE IS ZERO,
; RETURN TO CALL+3.
JUMPE T1, PNZ2 ;JUMP IF NULL OR SOME FORM OF ZERO.
TLO SW, IS ;TURN ON IMBEDDED "-" SWITCH.
;VALUE IS NOT ZERO.
PNZ4: TLNN SW, LS ;WAS THERE A LEADING SIGN?
JRST PNZ6 ;NO, SEE IF WE HAVE MORE TO DO.
TLNE SW, LM ;WAS THE LEADING SIGN A "-"?
JRST 1(T2) ;YES, SKIP-RETURN.
JRST (T2) ;NO, MUST HAVE BEEN A "+",
; NON-SKIP RETURN.
PNZ5: ILDB CH, IPTR ;GET THE NEXT CHAR.
LDB T1, CPTR ;CONVERT IT AND PICK UP FLAGS.
TRZE T1, SPCCH. ;SPECIAL CHAR?
JRST PNZ10 ;YES, GO SEE WHAT TO DO.
TLZ SW, IS ;TURN OFF IMBEDDED "-" SWITCH.
PNZ6: SOJG CNT, PNZ5 ;LOOP IF THERE ARE MORE CHARS.
PNZ7: TLNE SW, IS ;WAS THERE AN IMBEDDED "-"?
JRST 1(T2) ;YES, SKIP-RETURN.
JRST (T2) ;NO, MUST HAVE BEEN A "+",
; NON-SKIP RETURN.
;SPECIAL CHAR.
PNZ10: TRZN T1, IBNCH. ;IMBEDDED "-" SIGN?
JRST @PNZ12(T1) ;NO, DISPATCH.
PNZ11: TLO SW, IS ;TURN ON THE IMBEDDED "-" SWITCH.
;GO SEE IF THERE IS MORE TO DO.
;DISPATCH TABLE:
PNZ12: JRST PNZ6 ;NULL - IGNORE IT.
Z (T2) ;"+" - NON-SKIP RETURN.
Z 1(T2) ;"-" - SKIP REUTN.
EXP PNZ7 ;TERMINATE.
> ;END NON-BIS
IFN BIS,<
;THE POSITIVE TEST:
ENTRY POS.6 ;IF THE INPUT IS SIXBIT.
ENTRY POS.7 ;IF THE INPUT IS ASCII.
IFN EBCMP.,<
ENTRY POS.9 ;IF THE INPUT IS EBCDIC.
>
POS.6: JSP BISCH, POS ;ENTER HERE IF THE INPUT IS SIXBIT,
POS.7: JSP BISCH, POS ; HERE IF IT IS ASCII AND
IFN EBCMP.,<
BLOCK 1
POS.9: JSP BISCH, POS ; HERE IF IT IS EBCDIC.
>
POS:
SUBI BISCH,POS.6-5 ;COMPUTE BYTE SIZE.
HRLI PARM,(<Z DSTHI,0>) ;PUT DESTINATION AC INTO PARM
PUSHJ PP, GDX.## ;CONVERT TO BINARY
JUMPL DSTHI,RET.1## ;NEGATIVE
CAIN DSTLO,0
CAIE DSTHI,0
AOS (PP) ;POSITIVE
POPJ PP, ;ZERO
;THE NEGATIVE TEST:
ENTRY NEG.6 ;IF THE INPUT IS SIXBIT.
ENTRY NEG.7 ;IF THE INPUT IS ASCII.
IFN EBCMP.,<
ENTRY NEG.9 ;IF THE INPUT IS EBCDIC.
>
NEG.6: JSP BISCH, NEG ;ENTER HERE IF THE INPUT IS SIXBIT,
NEG.7: JSP BISCH, NEG ; HERE IF IT IS ASCII AND
IFN EBCMP.,<
BLOCK 1
NEG.9: JSP BISCH, NEG ; HERE IF IT IS EBCDIC.
>
NEG:
SUBI BISCH,NEG.6-5 ;COMPUTE BYTE SIZE.
HRLI PARM,(<Z DSTHI,0>) ;PUT DESTINATION AC INTO PARM
PUSHJ PP,GDX.
JUMPL DSTHI,RET.2## ;NEGATIVE
POPJ PP, ;POS/ZERO
;THE ZERO TEST:
ENTRY ZERO.6 ;IF THE INPUT IS SIXBIT.
ENTRY ZERO.7 ;IF THE INPUT IS ASCII.
IFN EBCMP.,<
ENTRY ZERO.9 ;IF THE INPUT IS EBCDIC.
>
ZERO.6: JSP BISCH, ZERO ;ENTER HERE IF THE INPUT IS SIXBIT,
ZERO.7: JSP BISCH, ZERO ; HERE IF IT IS ASCII AND
IFN EBCMP.,<
BLOCK 1
ZERO.9: JSP BISCH, ZERO ; HERE IF IT IS EBCDIC.
>
ZERO:
SUBI BISCH,ZERO.6-5 ;COMPUTE BYTE SIZE.
HRLI PARM,(<Z DSTHI,0>) ;PUT DESTINATION AC INTO PARM
PUSHJ PP,GDX.
CAIN DSTLO,0 ; [424] IS LOW PART ZERO?
CAIE DSTHI,0
POPJ PP, ;NON-ZERO
JRST RET.2## ;ZERO
> ;END OF BIS
END