1  /* derived from mozilla source code */
       2  
       3  #include <stdarg.h>
       4  
       5  typedef struct {
       6    void *stream;
       7    va_list ap;
       8    int nChar;  
       9  } ScanfState;
      10  
      11  void dummy (va_list vap)
      12  {
      13    if (va_arg (vap, int) != 1234) abort();
      14    return;
      15  }
      16  
      17  void test (int fmt, ...)
      18  {
      19    ScanfState state, *statep;
      20  
      21    statep = &state;
      22  
      23    va_start (statep->ap, fmt);
      24    dummy (statep->ap);
      25    va_end (statep->ap);
      26    
      27    va_start (state.ap, fmt);
      28    dummy (state.ap);
      29    va_end (state.ap);
      30    
      31    return;
      32  }
      33  
      34  int main (void)
      35  {
      36    test (456, 1234);
      37    exit (0);
      38  }