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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctest.h>
#define ptr(addr) (void *)((char *)addr)
char * userid(void)
{
void ** ascb; // -> ASCB - address space control block
void ** asxb; // -> ASXB - address space extension block
char * asxbuser; // -> ASCBUSER - userid
ascb = ptr(548); // -> ASCB
asxb = ptr(*ascb+108); // ASCB+108 -> ASXB
asxbuser = ptr(*asxb+192); // ASXB+192 -> ASXBUSER
return asxbuser;
}
main()
{
printf("'%8.8s'\n",userid());
return 0;
}
Of course, we're all waiting on IBM to supply C header files for the
assembler macros.
On 9/02/2018 3:47 AM, Bernd Oppolzer wrote:
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 *, then you REALLY add 0x6c,
and then you cast the result back to int *.
That's C ... the other solutions suggested (templates etc.) are C++
and don't apply in your case.
HTH, kind regards
Bernd
Am 08.02.2018 um 17:45 schrieb Barkow, Eileen:
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.
I am still not sure that I understand how to fix it but I will try
based on your info.
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