__m_copywin
#define overlay(s, t) __m_copywin(s, t, 1)
#define overwrite(s, t) __m_copywin(s, t, 0)
extern int __m_copywin(const WINDOW *, WINDOW *, int);
(void) __m_copywin(s, t, 1);
(void) __m_copywin(s, t, 0);
code = __m_copywin(s, t, 1);
code = __m_copywin(s, t, 0);
extern int __m_copywin(const WINDOW *, WINDOW *, int);