_plandata
struct _plandata *next; /* next node */
struct _plandata *_p_data[2]; /* PLAN trees */
struct _plandata *_e_next;/* next F_EXECPLUS in tree */
struct _plandata;
typedef int exec_f(struct _plandata *, FTSENT *);
typedef struct _plandata *creat_f(struct _option *, char ***);