Are questions about C better asked here or on MVS-OE? Surely
not on ASSEMBLER_LIST -- it's far too busy this week with a
nostalgia thread.
The C test program:
/* ---------------------------------------------------------*/
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
static char buffer[ 100 ];
static void f2( char *fmt, va_list xp ) {
va_list ap;
char *a;
memcpy( &ap, &xp, sizeof( va_list ) );
printf("Format: \"%s\"\n", fmt );
a = va_arg( ap, char * ); printf("First : \"%s\"\n", a );
a = va_arg( ap, char * ); printf("Second: \"%s\"\n", a );
memcpy( &ap, &xp, sizeof( va_list ) );
printf( "\nRetrying\n" );
a = va_arg( ap, char * ); printf("First : \"%s\"\n", a );
a = va_arg( ap, char * ); printf("Second: \"%s\"\n", a );
memcpy( &ap, &xp, sizeof( va_list ) );
printf( "\nTrying vsnprintf();\n" );
vsnprintf( buffer, 99, fmt, ap );
printf( "%s\n", buffer );
return; }
static void f1( char *fmt, ... ) {
va_list ap;
char *a;
va_start( ap, fmt );
f2( fmt, ap );
return; }
int main( void ) {
f1( " %s -- %s ", "foo", "bar" );
return( 0 ); }
/* ---------------------------------------------------------*/
On Solaris and OS X prints, as I expect:
Format: " %s -- %s "
First : "foo"
Second: "bar"
Retrying
First : "foo"
Second: "bar"
Trying vsnprintf();
foo -- bar
But on z/OS 1.10 and 1.7, the unexpected:
Format: " %s -- %s "
First : " %s -- %s "
Second: "foo"
Retrying
First : " %s -- %s "
Second: "foo"
Trying vsnprintf();
%s -- %s -- foo
Do I fail to understand something, or have I (again)
encountered a bug? I'll welcome any workaround that
doesn't break compatibility with the other 2 systems.
I'll likewise welcome a test on another system (Linux?)
Thanks,
gil
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