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  2. MIDRANGE-L
  3. February 2020

Re: parse a negative number out of a before image string

mark - thanks i took a look...

i'll tuck these away in case there is absolutely not any other more
practical (more transparent) way.
I'd really hate for the common pgmr come behind me on one of those. :)

always appreciate your willingness to help.

jay

On Fri, Feb 28, 2020 at 1:03 PM Mark Waterbury <
mark.s.waterbury@xxxxxxxxxxxxx> wrote:

Jay,

See also the MI instructions:

EDIT LBEDIT EDITPD

HTH,

Mark S. Waterbury

On Friday, February 28, 2020, 12:43:18 PM EST, Jay Vaughn <
jeffersonvaughn@xxxxxxxxx> wrote:

Tim it is indeed... as long as no sql is used in it.

I would very much appreciate it.

Jay

On Fri, Feb 28, 2020 at 12:41 PM Tim Fathers <X700-IX2J@xxxxxxxxxxx>
wrote:

If I understand the problem correctly, you can use the MI function
"cpynv"
to extract an arbitrary numeric field from it's binary form (as you
might
find in a trigger buffer, for example) to a string. It can be prototyped
as a built-in function and used directly from RPG, the only fiddly bit is
creating the to and from descriptors the function needs.

I have an example somewhere I could dig out if it's what you're after.

Tim.


________________________________
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> on behalf of
Jay
Vaughn <jeffersonvaughn@xxxxxxxxx>
Sent: 28 February 2020 18:21
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx

Subject: Re: parse a negative number out of a before image string

I hate to beat a dead horse with this topic but never really found a
solution using only RPG... my solution was derived from using SQL, but
now
I need an RPG solution only.

So running with Barbara's suggestion...

challenge - extract for a number of bytes, the length of a packed decimal
value (may contain decimals)
objective - convert that clear text value

In my pgm i have the below declaration...


d ds_cvtNumeric ds qualified
d charRep 31
d numRep 31 10 overlay(charRep)
d g_zeros s like(ds_cvtNumeric.charRep)
d inz(*all'0')


my string value that contains the packed value is 5 bytes long
(decimal(9.2)... and obviously in debug it is the reverse image
representation (non clear text).

in debug...

evalr ds_cvtNumeric.charRep = g_zeros +
%trim(%subst(srcString

:1


:i_numOfBytes)); = 5

o_clearTextValue = %char(ds_cvtNumeric.numRep);

this ends up with a data decimal error...

the debug eval shows...

EVAL ds_cvtnumeric
DS_CVTNUMERIC.NUMREP = 000000000000000000000.00000
DS_CVTNUMERIC.CHARREP = '00000000000000000000000000 '


I would really like to put this one to bed.
Any assistance is greatly appreciated.

Jay




On Wed, Oct 30, 2019 at 3:10 PM Barbara Morris <bmorris@xxxxxxxxxx>
wrote:

On 2019-10-30 11:51 a.m.,
dlclark@xxxxxxxxxxxxxxxx wrote:
"MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> wrote on
10/30/2019
11:46:31 AM:
You - what Dave says.

You could make the routine more generic if you needed it but this is
the simple way to map a single field.


Yes, for example (to make it more generic), you could
create a
15-character field and overlay it with a 15-digit (zero decimal)
zoned
field. Then, move zeroes to the zoned field before right justifying
the
character data into the character field. Then, you just have to
divide
the resulting zoned decimal number (into another field) by the number
of
desired decimal places that you got from SYSCOLUMNS.


To get the leading zeros and right-justify the character value in one
go, use EVALR with a character variable initialized to zeros.

dcl-ds cvtzoned qualified;
c char(15);
n zoned(15) overlay(c);
end-ds;
dcl-s zeros like(cvtzoned.c) inz(*all'0');

evalr cvtzoned.c = zeros + '1234N';
dsply (%char(cvtzoned.n));

--
Barbara

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