402 struct u_header  struct
407 	u_header_T *ptr;	// pointer to next undo header in list  argument
411 	u_header_T *ptr;	// pointer to previous header in list  argument
415 	u_header_T *ptr;	// pointer to next header for alt. redo  argument
419 	u_header_T *ptr;	// pointer to previous header for alt. redo  argument
421     } uh_alt_prev;
422     long	uh_seq;		// sequence number, higher == newer undo
423     int		uh_walk;	// used by undo_time()
424     u_entry_T	*uh_entry;	// pointer to first entry
425     u_entry_T	*uh_getbot_entry; // pointer to where ue_bot must be set
426     pos_T	uh_cursor;	// cursor position before saving
427     long	uh_cursor_vcol;
428     int		uh_flags;	// see below
429     pos_T	uh_namedm[NMARKS];	// marks before undo/after redo
430     visualinfo_T uh_visual;	// Visual areas before undo/after redo
431     time_T	uh_time;	// timestamp when the change was made
432     long	uh_save_nr;	// set when the file was saved after the
435     int		uh_magic;	// magic number to check allocation