Anybody have a sample of how to return a fullword to a C program from an
assembler subroutine?
Apologies if this seems basic, but I really haven't looked seriously at C
before.
I have read about 'Combining C or C++ and Assembler programs', which didn't
help.
I have this C program (extract):
extern int rxhlicpl();
int retcode;
char hlicmd[8];
char name[61];
int namelen;
char text[121];
int textlen;
. . .
strcpy (hlicmd, "VGET ");
strcpy (name, "TESTVAR");
namelen = 7 ;
strcpy (text, " ");
textlen = 120;
retcode = rxhlicpl (hlicmd, name, namelen, text, textlen);
printf("rc is %d, text is %d '%s'\n\n", retcode, textlen, text);
Running the program shows: rc is 0, text is 120 'Kilroy was here yesterday'
The RXHLICPL program is an assembler subroutine which returns data to the C
program. The char field is updated, but not the int field. I know from tracing
the assembler subroutine that the length value is correct and not 120.
The same subroutine, except from setting the end-of-data char in the text area,
runs in COBOL and sets the textlen field correctly.
I assume that it has something to do with C pointers, I never could get my head
around those.
The assembler pgm (extract):
ndp_blk dsect
ndp_cmda ds a
ndp_namea ds a
ndp_namela ds a
ndp_texta ds a
ndp_textla ds a
ereg 0,1
lr r9,r1
using ndp_blk,r9
l r5,zrx_getdl data size
l r1,ndp_textla -> data length field
st r5,0(,r1)
I am not using the the prolog and epilog macros as it seemed to work without,
and I really would like to avoid LE.
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