char* hdf_get_valuevf (HDF *hdf, const char *namefmt, va_list ap);
ARGUMENTShdf -> the dataset node to start from
namefmt -> the format string
ap -> va_list of varargs
DESCRIPTIONhdf_get_valuevf walks the data set pointed to by hdf via namefmt printf expanded with varargs ap, and returns the string value located there, or NULL if it doesn't exist. This differs from hdf_get_value in that there is no default value possible.