Re: parse a negative number out of a before image string -- MIDRANGE-L

...what's passed in to the function as input is the address of the data-structure containing the packed value, which is the non-clear version (if I understand you right). However, the EDIT function might be better for what you want anyway on second thoughts. The manual you might need is called "C Reference for MI" but as I can't find it at the moment it might have changed its name these days, but PDF copy is ancient!

Tim.

________________________________
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> on behalf of Jay Vaughn <jeffersonvaughn@xxxxxxxxx>
Sent: 28 February 2020 19:03
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: parse a negative number out of a before image string

Thanks Tim but I think you interpret my request backwards.... (or maybe i
wasn't clear - sorry)...
I'm looking to provide the source as the non-clear text char version of the
packed decimal value... not the packed numeric value itself.

this is what you provided... the source is backwards.

Packed = 12345.67; // Initialise example

// Create the MI numeric descriptors for the source and target
formats.
SrcNumDsc = CrtMINumD('P': 9: 2); // Source format is packed 9.2
TgtNumDsc = CrtMINumD('S': 9: 2); // Target format is zoned 9.2

// Do the conversion.
CpyNV(TgtNumDsc: // Target descriptor
%addr(Char): // Target value
SrcNumDsc: // Source descriptor
%addr(Example)); // Source value

got anything that will do it the other way around?

thanks

jay

On Fri, Feb 28, 2020 at 12:58 PM Tim Fathers <X700-IX2J@xxxxxxxxxxx> wrote:

Here it is, it's quite old so can probably be moderised a bit, but
hopefully it'll be something like what you need.

h debug(*yes)
h datfmt(*iso) datedit(*YMD/)

d CrtMINumD...
d pr 10i 0
d pvstfDBNTyp 1a value
d pvbinLen 10i 0 value
d pvbinFrc 10i 0 value

d X_T_SIGNED c const(00)
d X_T_FLOAT c const(01)
d X_T_ZONED c const(02)
d X_T_PACKED c const(03)
d X_T_CHAR c const(04)
d X_T_ONLYNS c const(06)
d X_T_ONLYN c const(07)
d X_T_EITHER c const(08)
d X_T_OPEN c const(09)
d X_T_UNSIGNED c const(10)

d CpyNv pr extproc('_CPYNV')
d TrgMINumD 10i 0 value
d ptrTrgNum * value
d SrcMINumD 10i 0 value
d SrcNum * value

d Example ds
d Packed 9p 2

d Char s 9s 2

d SrcNumDsc s 10i 0
Source descriptor
d TgtNumDsc s 10i 0
Target descriptor
/free

Packed = 12345.67; // Initialise example

// Create the MI numeric descriptors for the source and target
formats.
SrcNumDsc = CrtMINumD('P': 9: 2); // Source format is packed 9.2
TgtNumDsc = CrtMINumD('S': 9: 2); // Target format is zoned 9.2

// Do the conversion.
CpyNV(TgtNumDsc: // Target descriptor
%addr(Char): // Target value
SrcNumDsc: // Source descriptor
%addr(Example)); // Source value

return;
/end-free

//********************************************************************************************
// This procedure emulates the C macro found in QSYSINC/MIH,MICPTCOM
// which is used to create an MI number descriptor for the MI numeric
// instructions.

//********************************************************************************************
p CrtMINumD b
d pi 10i 0
d pvstfDBNTyp 1a value
d pvbinLen 10i 0 value
d pvbinFrc 10i 0 value

d pbinMINTyp s 10i 0
/free

// Convert the database field type to MI field type.
select;
when pvstfDBNTyp = 'S';
pbinMINTyp = X_T_ZONED;

when pvstfDBNTyp = 'F';
pbinMINTyp = X_T_FLOAT;

when pvstfDBNTyp = 'P';
pbinMINTyp = X_T_PACKED;

when pvstfDBNTyp = 'S';
pbinMINTyp = X_T_ZONED;

other;
pbinMINTyp = X_T_CHAR;
endsl;

return pbinMINTyp * (2**24) + // Shift right 24 bits
pvbinFrc * (2**16) + // Shift right 16 bits
pvbinLen * (2**8); // Shift right 8 bits

/end-free
p e

//********************************************************************************************

________________________________
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> on behalf of Jay
Vaughn <jeffersonvaughn@xxxxxxxxx>
Sent: 28 February 2020 18:42
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: parse a negative number out of a before image string

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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