13 Sep
2012
13 Sep
'12
3:33 a.m.
It should be no problem. All the DEC compilers share a common ABI (VMS calling and
condition handling standard). There is a manual in the "gray wall" just about
that. I can't search for it now, but iirc the title is easy to pick up.
Basic summary: scalars are passed by reference, strings are passed by descriptor address.
VMS C provides macros to build and manage descriptors (the ASCIZ convention is fortunately
not used).
Jordi Guillaumes i Pons
Barcelona - Catalunya - Europa
El 12/09/2012, a les 20:21, Sampsa Laine <sampsa at mac.com> va escriure:
Ah,
That for example calling C from COBOL is for OSF/1 only. I wonder how one does this on
VMS..
Sampsa
On 12 Sep 2012, at 21:10, Michael Young wrote:
found this at odl.sysworks.biz/disk$axpdocdec971/progtool/d37aaa48.p341.bkb#2110 :
Example 12-8: C Include File " cobfunc "
void cobcancel ( /* CANCEL the named COBOL routine */
char *name
);
int cobcall ( /* Call a COBOL program from a C routine */
char *name, /* READ: name of the program */
int argc, /* READ: how many arguments */
char **argv /* READ: array of pointers to the arguments */
);
int cobfunc ( /* Call a COBOL program from a C routine, then CANCEL it */
char *name, /* name of the program */
int argc, /* how many arguments */
char **argv /* array of pointers to the arguments */
);
#ifdef __osf__
void cob_init ( /* init the RTL */
int argc, /* argument count */
char **argv, /* arguments */
char **envp /* environment variable pointers */
);
#endif
--Mike
On Sep 12, 2012, at 1:54 PM, Sampsa Laine <sampsa at mac.com> wrote:
Does anybody happen to have a nice sample bit of code on how to call a C function from DEC
COBOL?
The documentation gave me this code:
/* crtn - c function to test use of argc and argv in c routines
* called from HP COBOL */
#include "cobfunc.h"
#include <stdio.h>
extern int _ _Argc;
extern char **_ _Argv[];
#define argc _ _Argc
#define argv (*_ _Argv)
void crtn()
{
int i;
i = 0;
for (i = 0; i < argc; i++) {
printf("argv[%d] = %s\n", i, argv[i]);
}
}
But I can't find cobfunc.h anywhere
Sampsa
On 12 Sep 2012, at 20:18, Sampsa Laine wrote:
Well this whole COBOL thing is verging on the humour value anyway, I think I might leave
that til later :)
Sampsa
On 12 Sep 2012, at 20:13, Jordi Guillaumes i Pons wrote:
IIRC there was no screen section support in VAX COBOL.
Perhaps this can be a good excuse to learn the SMG$ RTL routines...
Jordi Guillaumes i Pons
Barcelona - Catalunya - Europa
El 12/09/2012, a les 17:10, Sampsa Laine <sampsa at mac.com> va escriure:
Tried to compile my little program on GORVAX but it has problems with the SCREEN SECTION
that works on the AXP version..
I'm thinking I must have an old compiler or something. Anyone know what the latest is?
Anyone have a kit?
Sampsa
Michael Young
young at ecn.purdue.edu