#define	EOF	(-1)#define	NBUF	16384 struct io{	int	fd;	uchar	*bufp, *ebuf, *strp;	uchar	buf[NBUF];};io *err; io *openfd(int), *openstr(void), *opencore(char *, int);int emptybuf(io*);void pchr(io*, int);int rchr(io*);void closeio(io*);void flush(io*);int fullbuf(io*, int);void pdec(io*, int);void poct(io*, unsigned);void pptr(io*, void*);void pquo(io*, char*);void pwrd(io*, char*);void pstr(io*, char*);void pcmd(io*, tree*);void pval(io*, word*);void pfnc(io*, thread*);void pfmt(io*, char*, ...); // for figuring out the tree structurevoid tree2dot(io*, tree*);