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MAXLEN.ASM
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MAXLENA CSECT
* MAXLEN VERSION 2.0 BY CLYDE THOMAS ZUBER *
***********************************************************************
* *
* ATTR: RENT,REUS,REFR,AMODE(31),RMODE(ANY) *
* *
* PROGRAM DESCRIPTION: *
* *
* THIS ROUTINE RETURNS THE MAXIMUM LENGTH OF A PL/I VARYING CHARACTER *
* STRING. IF A FIXED LENGTH STRING IS PASSED AS THE ARGUMENT IT *
* WILL ALSO WORK BUT THE LENGTH BUILTIN FUNCTION SHOULD NORMALLY BE *
* USED INSTEAD. *
* *
* MAXLEN IS FOR PL/I PROGRAMS USING PL/I OPTIMIZER R3.1, R4.0 AND *
* R5.0 CONVENTIONS. *
* *
* ENTRY MAXLEN: *
* THE STRING DESCRIPTOR BLOCK IS PASSED AS A PARAMETER. THIS MEANS *
* THAT THE STRING MAY BE EITHER FIXED OR VARYING LENGTH. THE CONTROL *
* BLOCK FORMAT IS AS FOLLOWS: *
* 0 1 2 3 4 *
* ------------------------------------------ *
* | BYTE ADDR OF CHAR STRING | *
* ------------------------------------------ *
* | DCL LENGTH |X| UNUSED| | *
* ------------------------------------------ *
* 0=FIXED *
* 1=VARYING *
* WHEN USING THE MAXLEN ENTRY FROM PL/I IT SHOULD BE DECLARED AS A *
* PL/I PROCEDURE AS FOLLOWS: *
* DECLARE MAXLEN(CHAR(*) VARYING) ENTRY RETURNS(FIXED BINARY(31)); *
* THE RETURNS(FIXED BINARY(31)) WORKS BECAUSE PL/I CREATES A THIRD *
* ARGUMENT TO OBTAIN ITS RETURN VALUE. *
* *
* NOTE: PL/I ERROR MSG OFFSETS ARE RELATIVE TO REAL ENTRY POINT *
* R11 - PROCEDURE BASE *
* R12 - RESERVED *
* R13 - ADDRESS OF DYNAMIC STORAGE AREA *
* *
***********************************************************************
EJECT
***********************************************************************
*** IDENTIFICATION SECTION ********************************************
***********************************************************************
MAXLENA AMODE 31
MAXLENA RMODE ANY
ENTRY MAXLEN
DC AL1(6) PROGRAM IDENTIFIER
DC C'MAXLEN V2.0 BY CLYDE THOMAS ZUBER '
DS 0H
DC C' MAXLEN' PROGRAM IDENTIFIER
DC AL1(6) ..
***********************************************************************
*** REAL ENTRY - PROLOGUE CODE ****************************************
***********************************************************************
MAXLEN DS 0H
USING *,15 INDICATE BASE
STM 14,12,12(13) SAVE REGISTERS
LR 2,1 SAVE PARAMETER LIST ADDRESS
LA 0,STOREND-STORAGE PUT THE LENGTH OF THE NEW DSA IN R0
L 1,76(13) PTR NEXT AVAIL BYTE AFTER LAST DSA
ALR 0,1 ADD THEM TOGETHER
CL 0,12(12) COMPARE WITH LAST AVAILABLE BYTE
BNH SPCAVAIL IT WILL FIT
L 15,116(12) OBTAIN MORE STORAGE (PL/I ROUTINE)
BALR 14,15 ..
SPCAVAIL L 14,72(13) GET ADDR OF LSW FROM OLD DSA
LR 15,0 COPY R0 (NAB AFTER NEW DSA)
STM 14,0,72(1) SAVE LSW AND NAB IN NEW DSA
L 15,16(13) RESTORE R15 (BASE REG)
ST 13,4(1) ADDR OF LAST DSA IN NEW DSA
ST 1,8(13) CHAIN SAVE AREA (NOT DONE BY PL/I)
MVI 0(1),X'80' SET FLAGS IN DSA TO PRESERVE PL/I
MVI 1(1),X'00' ERROR HANDLING IN THIS ROUTINE
MVI 86(1),X'91' ..
MVI 87(1),X'C0' ..
LR 13,1 POINT TO NEW DSA
USING STORAGE,13 ..
EJECT
***********************************************************************
*** PROCEDURE BASE ****************************************************
***********************************************************************
BALR 11,0 SET UP NEW BASE
USING *,11 INDICATE BASE
LM 2,3,0(2) ADDRESS OF ARGUMENTS
LH 4,4(2) FIXED LENGTH OF STR
ST 4,0(3) RETURN ANSWER
***********************************************************************
*** EPILOGUE CODE *****************************************************
***********************************************************************
L 13,4(13) FORGET CURRENT (NEW) DSA
*********ST****15,16(13)***********SAVE*RETURN*CODE********************
LM 14,12,12(13) RESTORE CALLER'S REGISTERS
BR 14 RETURN
***********************************************************************
*** DYNAMIC STORAGE AREA **********************************************
***********************************************************************
STORAGE DSECT
SAVEAREA DS 22F
STOREND DS 0D
END