RTVCMDNAM program (Son of Command validation program)

I have written a program which may be called by a command validation
program (or other program) to determine the name of the calling command.
This technique uses the QMHRTVRQ API to retrieve the last *RQS message
(similar to what Simon Coulter described with RCVMSG).

Basically, the following gives you the last request message, which
contains the last command executed:

/*** API variables ***/
DCL        VAR(&APIDTAFMT) TYPE(*CHAR) LEN(8) +        
             VALUE('RTVQ0100') /* API data formt */    
DCL        VAR(&APIDTALEN) TYPE(*CHAR) LEN(4) +        
             VALUE(X'000007D0') /* API data length:  + 
             2000 */                                   
DCL        VAR(&APIDTARTV) TYPE(*CHAR) LEN(2000) /* +  
             Retrieved API data */                     
DCL        VAR(&APIERRCD) TYPE(*CHAR) LEN(4) +         
             VALUE(X'00000000') /* API error code (no +
             data returned) */                         
DCL        VAR(&APILEN) TYPE(*CHAR) LEN(4) /* Data +   
             length returned */                        
DCL        VAR(&APIMSGKEY) TYPE(*CHAR) LEN(4) +        
             VALUE('    ') /* No message key */        
DCL        VAR(&APIMSGTYP) TYPE(*CHAR) LEN(10) +       
             VALUE('*LAST') /* Request message type */ 

/*** Retrieve info on last request message ***/
CALL       PGM(QMHRTVRQ) PARM(&APIDTARTV &APIDTALEN +    
             &APIDTAFMT &APIMSGTYP &APIMSGKEY &APIERRCD) 

This technique has worked well for me.  I'll let you decide whether it
fits the simple and elegant litmus test.  Let me know if you'd like the
complete source program - I'll be happy to make it available to the
community.

Regards,
Jerry Jewel

Better living through fine code and hot coffee!
Email: jerry.jewel@nissan-usa.com
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