574     // if the buffer overflows instead of the length the string would have

   574     // if the buffer overflows instead of the length the string would have

   575     // been as expected.

   575     // been as expected.

   576     // In this case we make another copy of va and fetch the length only

   576     // In this case we make another copy of va and fetch the length only

   577     // with another call to _vscprintf

   577     // with another call to _vscprintf

   578 

   578 

   580     if (len == -1)

   580     if (len == -1)

   581     {

   581     {

   582         va_copy(ap, va);

   582         va_copy(ap, va);

   583         len = _vscprintf(fmt, ap);

   583         len = _vscprintf(fmt, ap);

   584         va_end(ap);

   584         va_end(ap);