• Subject: Re: Blank Supress
  • From: Jerry Feador <JLF@xxxxxxxxxxxxxxxx>
  • Date: Thu, 22 Jul 1999 07:30:58 -0700

Hi Hans,

Thanks for the explanation. It's cool to know how things work "on the inside".

Okay, so a little more layman... An end of field pointer is used to indicate 
the end of the field, and after a %trim it is set to the end of the actual data 
(right?) So what if the data doesn't start in position 1? Doesn't the %trim 
"clip" the data from the right and left of the data? Is there a "pointer" for 
the beginning of data?

Well, I probably don't know what I'm talking about enough to ask any more 
"haven't got a clue" questions so please, nitpick away...

Jerry

>>> <boldt@ca.ibm.com> 07/22 5:00 AM >>>


Jerry wrote:
> Yes, the result is = 4, I just tried it, nothing else to do,
> the %len obviously doesn't count the null characters in the
> field after the %trim.  pretty cool,

Well, I don't mean to nitpick, but there are no null characters
in the field after the %trim.  "C" convention uses the null
character to indicate the end of a character string.  But in
RPG IV, we maintain a separate length attribute.  For char
varying fields, the length is a 16-bit unsigned number at the
beginning of the fields storage.  (Within expressions, though,
the length is held in some temporary variable.)  Within a char
varying field, the characters following the logical end of the
data can be anything, but they're ignored by RPG.

In order to support the character string BIF's, we actually
had support for the character varying type within expressions
since V3R1.  However, we didn't get around to actually adding
the varying data types until V4R2.  Priorities, you know.

If you need to pass a null terminated string to a "C" function,
use keyword OPTIONS(*STRING).  Or to use a null terminated
string as a normal RPG IV char field, use built-in function
%STR.

Cheers!  Hans

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com 


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