rewind(b->ufd); b->uend=0; return(0); }
integer f_rew(alist *a)#endif{	unit *b;	if(a->aunit>=MXUNIT || a->aunit<0)		err(a->aerr,101,"rewind");	b = &f__units[a->aunit];	if(b->ufd == NULL || b->uwrt == 3)		return(0);	if(!b->useek)		err(a->aerr,106,"rewind")	if(b->uwrt) {		(void) t_runc(a);		b->uwrt = 3;		}