#include <u.h>#include <libc.h>#include <bio.h>#include <ctype.h>#include <ndb.h> Ndb*ndbcat(Ndb *a, Ndb *b){	Ndb *db = a; 	/*	 * make additions persistant, though	 * not in the database= line	 */	if(a != nil)		a->flags |= Ndbhead;	if(b != nil)		b->flags |= Ndbhead; 	if(a == nil)		return b;	while(a->next != nil)		a = a->next;	a->next = b;	return db;}