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/* copied from rsync */
#include <sys/types.h>
#include <stdarg.h>
void foo(const char *format, ...) {
va_list ap;
int len;
char buf[5];
va_start(ap, format);
len = vsnprintf(0, 0, format, ap);
va_end(ap);
if (len != 5) exit(1);
if (snprintf(buf, 3, "hello") != 5 || strcmp(buf, "he") != 0) exit(1);
exit(0);
}
int main() { foo("hello"); }
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