-#define is_cleared(win) ((win)->_clear)
-#define is_idcok(win) ((win)->_idcok)
-#define is_idlok(win) ((win)->_idlok)
-#define is_immedok(win) ((win)->_immed)
-#define is_keypad(win) ((win)->_use_keypad)
-#define is_leaveok(win) ((win)->_leaveok)
-#define is_nodelay(win) ((win)->_delay == 0)
-#define is_notimeout(win) ((win)->_notimeout)
-#define is_scrollok(win) ((win)->_scroll)
-#define is_syncok(win) ((win)->_sync)
+#define is_cleared(win) ((win) ? (win)->_clear : FALSE)
+#define is_idcok(win) ((win) ? (win)->_idcok : FALSE)
+#define is_idlok(win) ((win) ? (win)->_idlok : FALSE)
+#define is_immedok(win) ((win) ? (win)->_immed : FALSE)
+#define is_keypad(win) ((win) ? (win)->_use_keypad : FALSE)
+#define is_leaveok(win) ((win) ? (win)->_leaveok : FALSE)
+#define is_nodelay(win) ((win) ? ((win)->_delay == 0) : FALSE)
+#define is_notimeout(win) ((win) ? (win)->_notimeout : FALSE)
+#define is_pad(win) ((win) ? ((win)->_flags & _ISPAD) != 0 : FALSE)
+#define is_scrollok(win) ((win) ? (win)->_scroll : FALSE)
+#define is_subwin(win) ((win) ? ((win)->_flags & _SUBWIN) != 0 : FALSE)
+#define is_syncok(win) ((win) ? (win)->_sync : FALSE)