I don't understand why everyone seems to cast to int * and not void *.
Chasing control blocks is simple in C just using a basic macro.
#include
#include
#include
#include
#define ptr(addr) (void *)((char *)addr)
char * userid(void)
{
void ** ascb; // -> ASCB - address space cont
On 10/02/2018 6:30 AM, Kirk Wolf wrote:
Yes - edcdsect.rexx is something that I wrote many years ago.
I'm happy to share it off-list with anyone - I didn't post it as to avoid
attacks on my my crappy REXX hackery.
There's nothing wrong with that REXX. I use it all the time!
---
DU] On
> Behalf Of Barkow, Eileen
> Sent: Thursday, February 08, 2018 8:06 AM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Silly C problem adding hex 6C
>
> I am still trying to crawl my way around C/C++ and am just trying to do
one simple thing:
> add value 0X6C to a pointer ad
al Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Kirk Wolf
Sent: Friday, February 9, 2018 2:31 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C-psa.h - edcdsect
Charles,
If you look at how EDCDSECT handles ORG/redefines, it
On Fri, 9 Feb 2018 20:51:41 +, Barkow, Eileen wrote:
>... I do not think that we have rexx installed on Unix. ...
>
Rexx is standard on z/OS UNIX; no install necessary.
*However*, IBM supplies some EXECs in UNIX directories, clumsy to access
from batch or TSO. (Use BPXBATCH or BPXWUNIX). O
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
> Behalf Of Barkow, Eileen
> Sent: Friday, February 9, 2018 12:52 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: Silly C problem adding hex 6C-psa.h - edcdsect
>
> I do not see edcdsect.rexx anywhere. I do no
List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
Behalf Of Barkow, Eileen
Sent: Friday, February 9, 2018 12:52 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C-psa.h - edcdsect
I do not see edcdsect.rexx anywhere. I do not think that we have rexx
installed on Unix.
-Original Me
: Re: Silly C problem adding hex 6C-psa.h - edcdsect
First, he didn't provide the script, only illustrated its use. Second CLIST and
REXX are two very different languages.
Kirk was showing the OMVS commands to use edcdsect.rexx.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~s
frame Discussion List on behalf of
Barkow, Eileen
Sent: Friday, February 9, 2018 8:40 AM
To: IBM-MAIN@listserv.ua.edu
Subject: Re: Silly C problem adding hex 6C-psa.h - edcdsect
How do you run this script?
I tried it under UNIX and MVS as a rexx clist and get all kinds of errors.
$ ccsect
Bernd Oppolzer wrote:
>.. in fact, the original source contains some parts, which are not ANSI C, for
>example cout (which is C++) and iostream.h (which is also part of the C++
>library).
>Because I don't like C++ ... and the program claims to be a C program, I would
>(as a QA person) force th
if they exist?
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Ray Pearce
Sent: Friday, February 09, 2018 9:18 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
Have you looked at the JZOS Toolkit? It makes this
, Eileen
Sent: 09 February 2018 14:00
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
Actually I do not like C or C++ very much - I am just including some c routines
in a java program I am writing because there are a lot of things that cannot be
done in Java, or least I do
-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Bernd Oppolzer
Sent: Friday, February 09, 2018 6:41 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
.. in fact, the original source contains some parts,
which are not ANSI C, for example
Behalf
Of Kirk Wolf
Sent: Friday, February 09, 2018 7:58 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
It is better IMO to use EDCDSECT and create C header files for the system
DSECTS (PSA, ASCB, ASXB, etc), then you don't have to hard code offsets
into your code
It is better IMO to use EDCDSECT and create C header files for the system
DSECTS (PSA, ASCB, ASXB, etc), then you don't have to hard code offsets
into your code.
We have a little rexx shell script that we have been using for a dozen
years that invokes the assembler + EDCDSECT. It is simple to add
More simple ... the pointers don't need to be int pointers;
char pointers are just as good:
#include
#include
#include
#include
int main (int argc, char **argv)
{
char *PSA;
char *ASCB;
char *ASXB;
char *ASXBP;
char *JNPI;
char jobname[9];
PSA = (char *) 0x224; /* ad
This is a slightly modified version of jn2.c:
#include
#include
#include
#include
int main (int argc, char **argv)
{
int *PSA;
int *ASCB;
int *ASXB;
int *ASXBP;
int *JNPI;
char jobname[9];
PSA = (int *) 0x224; /* address of PSAAOLD */
ASCB = (int *) *PSA;
printf
.. in fact, the original source contains some parts,
which are not ANSI C, for example cout (which is C++)
and iostream.h (which is also part of the C++ library).
Because I don't like C++ ... and the program claims to be
a C program, I would (as a QA person) force the coder to
eliminate these par
Am 09.02.2018 um 07:45 schrieb Elardus Engelbrecht:
Bernd Oppolzer wrote:
To be more pedantic, use additional parantheses:
ASXB = (int *) (((char *) ASCB) + 0x6c);
I C ( "I see" ;-D )
Seriously, I find this whole thread very interesting.
Just a question please and please excuse my igno
Bernd Oppolzer wrote:
>To be more pedantic, use additional parantheses:
>ASXB = (int *) (((char *) ASCB) + 0x6c);
I C ( "I see" ;-D )
Seriously, I find this whole thread very interesting.
Just a question please and please excuse my ignorance.
Are these discussions about C or C++?
Becau
To be more pedantic, use additional parantheses:
ASXB = (int *) (((char *) ASCB) + 0x6c);
Kind regards
Bernd
Am 08.02.2018 um 20:47 schrieb Bernd Oppolzer:
int *ASCB;
int *ASXB;
ASXB = ASCB + 0x6c;
because ASCB is a pointer to int, and int has sizeof = 4,
you are in fact adding 4 * 0x6
int *ASCB;
int *ASXB;
ASXB = ASCB + 0x6c;
because ASCB is a pointer to int, and int has sizeof = 4,
you are in fact adding 4 * 0x6c to ASCB, that's your problem.
use the following notation, and it will work:
ASXB = (int *) ((char *) ASCB + 0x6c);
first you cast the ASCB to a char *,
obname,JNPI,8);
cout<<"jobname = "<mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of John McKown
Sent: Thursday, February 08, 2018 12:48 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
On Thu, Feb 8, 2018 at 11:39 AM, Paul Gilmartin <
000433f07
-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
(char *)(ASCB + 0x6C) is going to add 0x6c * 4 since ASCB is a pointer to
integer, then that will be recast to a char *.
(char *)ASCB + 06C will add 0x6c.
Define everything as unsigned char *, since that's what you're reall
ually used.
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Barkow, Eileen
Sent: Thursday, February 08, 2018 11:14
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
I tried the simplest solution of casting ASXB
Now you ran into another problem
(((char *)pointer) + offset)
is how you want to bind that expression.
(And I still think using structs is better)
(and you may have to add (int*) in front of the line above)
--
For IBM-MAIN sub
rame Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Paul Gilmartin
Sent: Thursday, February 08, 2018 12:39 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
On Thu, 8 Feb 2018 10:22:40 -0600, Allan Kielstra wrote:
>The size of a char in 1 byte. Try
&
On Thu, 8 Feb 2018 16:45:18 +, Barkow, Eileen wrote:
>Thank you Charles and Seymore. I thought that the problem had something to do
>with adding to pointers but
>I could not find any doc about it in the manuals.
>
In fact, subscripting is defined in terms of addition and dereferencing. So:
On Thu, Feb 8, 2018 at 11:39 AM, Paul Gilmartin <
000433f07816-dmarc-requ...@listserv.ua.edu> wrote:
> On Thu, 8 Feb 2018 10:22:40 -0600, Allan Kielstra wrote:
>
> >The size of a char in 1 byte. Try
> >
> >(char *) ASXB = (char *) ASCB + 0x6c; /* lazy version */
> >
> ANSI says a cast may no
On Thu, 8 Feb 2018 10:22:40 -0600, Allan Kielstra wrote:
>The size of a char in 1 byte. Try
>
>(char *) ASXB = (char *) ASCB + 0x6c; /* lazy version */
>
ANSI says a cast may not be used as an L-value. IBM's C compiler
enforces this. I once did something like (IIRC?):
*(char * *) ASXB +=
lates "automate" that (C++ only).
Charles
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
Behalf Of Barkow, Eileen
Sent: Thursday, February 8, 2018 8:45 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
Thank
Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Charles Mills
Sent: Thursday, February 08, 2018 11:33 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
Yes, pointer arithmetic is scaled by the item size. Works kind of like a
subscript. If foo is an int* then foo
-MAIN@listserv.ua.edu
Subject: Re: Silly C problem adding hex 6C
How do you specify the item size when adding?
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Seymour J Metz
Sent: Thursday, February 08, 2018 11:12 AM
To: IBM-MAIN
->apfelen);
Charles
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
Behalf Of Seymour J Metz
Sent: Thursday, February 8, 2018 8:12 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
Isn't pointer arithmetic in C s
The size of a char in 1 byte. Try
(char *) ASXB = (char *) ASCB + 0x6c; /* lazy version */
But that's not really very nice C code. Rather than using int * variables, it
would be preferable to provide a C struct describing the layout of storage and
using a pointer (or a pointer to a pointer)
How do you specify the item size when adding?
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Seymour J Metz
Sent: Thursday, February 08, 2018 11:12 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Silly C problem adding hex 6C
Isn&#
a.edu
Subject: Silly C problem adding hex 6C
I am still trying to crawl my way around C/C++ and am just trying to do one
simple thing:
add value 0X6C to a pointer address (which was originally supplied by this list
as a means to get the jobname).
something gets added to the pointer but it is not 0x
I am still trying to crawl my way around C/C++ and am just trying to do one
simple thing:
add value 0X6C to a pointer address (which was originally supplied by this list
as a means to get the jobname).
something gets added to the pointer but it is not 0x6c.
i tried all different combinations of
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