I did some tests with the MVS variant of z/OS XL C (V3.1).
In the first run, I had problems with snprintf, because it is not part
of the ANSI cosmos, which I am accustomed to use,
so I changed this to sprintf and omitted the length parameter. Same result.
Test msg 10 parm P1: aaaaa P2: bbbbb P3: ccccc P4: ddddd P5: eeeee P6: fffff P7:
ggggg P8: hhhhh P9: iiiii P10: P11: <
Then I omitted the 1$ flags etc., because they seem strange to me; I
don't know what they are doing.
I simply used %s everywhere. The parameter strings are NULL-terminated,
after all.
Now I get:
Test msg 10 parm P1: aaaaa P2: bbbbb P3: cccccP4: ddddd P5: eeeee P6:
fffff P7: ggggg P8: hhhhh P9: iiiii P10: jjjjj P11: kkkkk <
Here the modified source code:
#include<stdio.h>
int main( int argc, char **argv ){
char b[4096];
sprintf (b, "Test msg 10 parm P1: %s P2: %s P3: %s"
"P4: %s P5: %s \n P6: %s P7: %s P8: %s P9: %s "
"P10: %s P11: %s <",
"aaaaa","bbbbb","ccccc","ddddd","eeeee","fffff",
"ggggg","hhhhh","iiiii","jjjjj","kkkkk");
printf( "%s\n", b );
return 0;
}
HTH, kind regards
Bernd
Test msg 10 parm P1: aaaaa P2: bbbbb P3: cccccP4: ddddd P5: eeeee
P6: fffff P7: ggggg P8: hhhhh P9: iiiii P10: jjjjj P11: kkkkk <
Am 02.10.2025 um 22:21 schrieb Phil Smith III:
If so, can you try this trivial program from USS (or the MVS side, I don't
care, but it's easier from USS):
-------------------
#include<stdio.h>
int main( int argc, char **argv ){
char b[4096];
snprintf( b, 4096, "Test msg 10 parm P1: %1$s P2: %2$s P3: %3$s P4: %4$s P5: %5$s P6: %6$s P7: %7$s P8: %8$s P9: %9$s P10: %10$s P11: %11$s
<","aaaaa","bbbbb","ccccc","ddddd","eeeee","fffff","ggggg","hhhhh","iiiii","jjjjj","kkkkk");
printf( "%s\n", b );
return 0;
}
-------------------
* To build (assuming you named it bug.c):
c89 bug.c
-------------------
* Then:
./a.out
-------------------
* I get this output on my z/OS system:
Test msg 10 parm P1: aaaaa P2: bbbbb P3: ccccc P4: ddddd P5: eeeee P6: fffff P7:
ggggg P8: hhhhh P9: iiiii P10: P11: <
* That should have been:
Test msg 10 parm P1: aaaaa P2: bbbbb P3: ccccc P4: ddddd P5: eeeee P6: fffff P7:
ggggg P8: hhhhh P9: iiiii P10: jjjjj P11: kkkkk <
-------------------
It appears that the XLC runtime doesn't handle more than 9 arguments using the
%n$s format (at least). We found this because some new code was blowing up, and
we of course assumed it was something wrong with one of the many formats (they
aren't all just s-type).
The compiler listings say just:
15650ZOS V2.4 z/OS XL C
I'm hoping someone with a newer version can confirm that this is fixed. We're
going to have to work around it anyway, because it's not that hard (we only
have one such example) and I'd rather not require an IBM PTF for our customers.
Thanks...
...phsiii
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