RE: [EXTERNAL] Re: Remove unprintable chars

Here's the code I tested: ultra fast and ultra compact. A 1-liner beats any slow do 1-char at a time multi-line of code loop
dcl-s str char(1000);

str=X'12'+'some string'+X'350A13';
str=%Xlate(X'000102030405060708090A0B0C0D0E0F+
101112131415161718191A1B1C1D1E1F+
202122232425262728292A2B2C2D2E2F+
303132333435363738393A3B3C3D3E3F'
:' '+
' '
:str);


make sure the 2nd parm of the Xlate bif has exactly 64 blanks


-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Bruce Vining
Sent: Thursday, November 18, 2021 18:33
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: [EXTERNAL] Re: Remove unprintable chars

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I'm going to exit this thread as I'm clearly missing something, but do believe that the explicit loop looking for < blank (as proposed by Alan) is the best performer. I really hope that Barbara notices this thread and joins in as I'm always open to education from her :)

To me Xlate (and I agree with Scott on Xlating to x'40' rather than x'39'
or some such followed by a ScanRpl) is "somewhere" (I don't know if it might be an implicit RPG compiler generated lookup or a MI instruction as I haven't checked MI in a long, long time) having to look up the current byte being processed and having to search to see if it is in the Xlate from string in order to replace it with the Xlate to string, which certainly suggests more machine processing to me. Doing a direct loop on < blank eliminates this additional processing of specific from values. Please note that I'm looking at this strictly from a system performance (cycles) point of view.

I also agree with Scott on < '40' might be a problem in some environments and I'm thinking DBCS shift controls in particular (though there is nothing in this thread suggesting DBCS needs).

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