for _, f := range fld {
		for _, n := range f.Names {
			if n.Name != prefix {
				n.Name = strings.TrimPrefix(n.Name, prefix)
			}
			if n.Name == "_" {
				// Use exported name instead.
				n.Name = "Pad_cgo_" + strconv.Itoa(npad)
				npad++
			}
			n.Name = upper(n.Name)
		}
	}
}

// fieldPrefix returns the prefix that should be removed from all the