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 char *; int *; void *; adding decimal
108; but still get the same thing.
My little program correctly picks up the address of a valid ASCB (00FCAA00)
from the PSA.
Now I just want to point to the address at 00FCAA6C which is a pointer to the
ASXB which contains the jobname at offset 0XC0.
But somehow I cannot add 6C to the ASCB pointer FCAA00 and get the ASXB pointer
at FCAA6C.
Instead I get FCABB0 (or some other address depending on which ASCB is
obtained).
Can some C guru please tell me what I am doing wrong?
i will post the program and results - this is running on UNIX/OMVS.
MVSZ MVSZ - Storage Contents : ACSCEXB -- (00FCAA00,,SQA) -------------------
Command ===> Scroll ===> PAG
Address Offset 0-1-2-3- 4-5-6-7- 8-9-A-B- C-D-E-F- 0---4---8---C---
00FCAA00 +0 C1E2C3C2 00FBC100 00FCAB80 00000000 | ASCB..A...¿Ø.... |
00FCAA10 +10 00000000 00000000 00000000 00000000 | ................ |
00FCAA20 +20 000002E4 00780000 000100FF 00000000 | ...U.Ì.......... |
00FCAA30 +30 7FF19E00 00000000 19A77000 00000000 | "1Æ......xø..... |
00FCAA40 +40 00000000 00308F46 D3DC5674 8B346008 | ......±ãLüîÈ».-. |
00FCAA50 +50 00000000 00000000 00000000 00000000 | ................ |
00FCAA60 +60 00AFF158 FFFF8F80 00000000 00AFD000 | .®1ì..±Ø.....®}. |
00FCAA70 +70 1D171020 00000000 00000000 00AFD520 | .............®N. |
00FCAA80 +80 00000000 00000000 80AFFF98 40000000 | ........Ø®.q ... |
result running jn2
$ jn2
ASCB = FCAA00
ASXB = FCABB0
$
jn2.c program
#define _XOPEN_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <iostream.h>
int main(int argc, char *argv[])
{
int *PSA;
int *ASCB;
int *ASXB;
char jobname[9];
PSA=(int *)0x224; /* address of PSAAOLD */
ASCB=(int *)*PSA;
printf("ASCB = %X\n",ASCB);
ASXB=ASCB+0x6c;
printf("ASXB = %X\n",ASXB);
}
to compile:
c++ -+ -c -o jn2.o -I/u/eileen/j16/cons \
-I/usr/lpp/java/J8.0_64/include \
-W"c,lp64,dll,xplink,langlvl(longlong,nullptr)" jn2.c
to link:
c++ \
-W l,AMODE=64,lp64,LET=4,xplink,dynam=dll,case=mixed \
-I=CELQS003.x \
-o jn2 \
linkmods/CELQSTRT.o \
linkmods/CEESTART.o \
linkmods/CELQSG03.o \
linkmods/CELQINPL.o \
linkmods/CELQETBL.o \
linkmods/CELQLLST.o \
linkmods/CELQBST.o \
linkmods/CELQTRM.o \
jn2.o
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