Mainframe Utility: HEXSUB

PROC 2 HEXNUM1 HEXNUM2
/**** SET MESSAGE DISPLAY ON/OFF BASED ON THE DEBUG SWITCH ***/
ISPEXEC VGET (DBGSWTCH) PROFILE
IF &DBGSWTCH = &STR(ON) THEN CONTROL MSG LIST CONLIST SYMLIST NOFLUSH
ELSE CONTROL NOMSG NOLIST NOFLUSH NOPROMPT
IF &HEXNUM1 = &STR(HELP) THEN GOTO HELPSEC
SET HLEN1 = &LENGTH(&HEXNUM1)
IF &HLEN1 > 8 THEN GOTO END1
SET COUNT = 1
SET SLEN = &HLEN1 - 1
SET SNUM1 = 0
DO WHILE &COUNT LE &HLEN1
   SET HCHAR = &SUBSTR(&COUNT,&HEXNUM1)
   IF &HCHAR = A THEN SET HCHAR = 10
   IF &HCHAR = B THEN SET HCHAR = 11
   IF &HCHAR = C THEN SET HCHAR = 12
   IF &HCHAR = D THEN SET HCHAR = 13
   IF &HCHAR = E THEN SET HCHAR = 14
   IF &HCHAR = F THEN SET HCHAR = 15
   SET SNUM1 = &SNUM1 + (&HCHAR * (16 ** &SLEN))
   SET COUNT = &COUNT + 1
   SET SLEN = &SLEN - 1
END
/*
SET HLEN2 = &LENGTH(&HEXNUM2)
IF &HLEN2 > 8 THEN GOTO END2
SET COUNT = 1
SET SLEN = &HLEN2 - 1
SET SNUM2 = 0
DO WHILE &COUNT LE &HLEN2
   SET HCHAR = &SUBSTR(&COUNT,&HEXNUM2)
   IF &HCHAR = A THEN SET HCHAR = 10
   IF &HCHAR = B THEN SET HCHAR = 11
   IF &HCHAR = C THEN SET HCHAR = 12
   IF &HCHAR = D THEN SET HCHAR = 13
   IF &HCHAR = E THEN SET HCHAR = 14
   IF &HCHAR = F THEN SET HCHAR = 15
   SET SNUM2 = &SNUM2 + (&HCHAR * (16 ** &SLEN))
   SET COUNT = &COUNT + 1
   SET SLEN = &SLEN - 1
END
/*
SET SNUM2 = &SNUM1 - &SNUM2
SET ANUM = &SNUM2
SET HLEN3 = &LENGTH(&SNUM2)
SET COUNT = &HLEN3
/*
DO WHILE &ANUM NE 0
   SET BNUM = &ANUM / 16
   SET CNUM = &BNUM * 16
   SET RNUM = &ANUM - &CNUM
   SET ANUM = &BNUM
   IF &RNUM = 10 THEN SET RNUM = A
   IF &RNUM = 11 THEN SET RNUM = B
   IF &RNUM = 12 THEN SET RNUM = C
   IF &RNUM = 13 THEN SET RNUM = D
   IF &RNUM = 14 THEN SET RNUM = E
   IF &RNUM = 15 THEN SET RNUM = F
   IF &COUNT = 1 THEN SET &HC1 = &RNUM
   IF &COUNT = 2 THEN SET &HC2 = &RNUM
   IF &COUNT = 3 THEN SET &HC3 = &RNUM
   IF &COUNT = 4 THEN SET &HC4 = &RNUM
   IF &COUNT = 5 THEN SET &HC5 = &RNUM
   IF &COUNT = 6 THEN SET &HC6 = &RNUM
   IF &COUNT = 7 THEN SET &HC7 = &RNUM
   IF &COUNT = 8 THEN SET &HC8 = &RNUM
   SET COUNT = &COUNT - 1
END
/*
SET HNUM = &STR(&HC1&HC2&HC3&HC4&HC5&HC6&HC7&HC8)
/*
SET ZEDLMSG = +
   &STR(HEX (&HEXNUM1) - HEX (&HEXNUM2) = DECIMAL (&SNUM2) HEX (&HNUM))
ISPEXEC SETMSG MSG(UTLZ001)
EXIT
END1: +
SET ZEDLMSG = +
   &STR("HEXSUB" CANNOT HANDLE EITHER HEX NUMBER BEING GREATER THAN 8 +
        DIGITS)
ISPEXEC SETMSG MSG(UTLZ001)
EXIT
END2: +
SET ZEDLMSG = +
   &STR("HEXSUB" CANNOT HANDLE EITHER HEX NUMBER BEING GREATER THAN 8 +
        DIGITS)
ISPEXEC SETMSG MSG(UTLZ001)
EXIT
HELPSEC: +                                                              04470000
CLEAR                                                                   04470000
WRITE *** HELP FOR CLIST HEXSUB ***                                     04470000
WRITE                                                                   04470000
WRITE NO HELP WRITTEN AT THIS TIME                                      04470000
WRITE                                                                   04470000
WRITE *** END OF HELP *** NO PROCESSING PERFORMED ***                   04470000
EXIT                                                                    04470000
            

 This CLIST takes 2 hexadecimal numbers as input, subtracts the 2nd from the 1st
 and displays the result in hexadecimal and decimal format.  An example is as
 follows :

 COMMAND ===> HEXSUB 789EF AAA

 The resulting message would be :

 HEX (789EF) - HEX (AAA) = DECIMAL (491333) HEX (77F45)

 Neither input number can be greated than 8 digits in length.