#define EOF (-1)
#define NBUF 512

struct Io
{
    int fd;
    char *bufp, *ebuf, *strp, buf[NBUF];
};

extern struct Io *err;

Io *openfd(int);
Io *openstr(void);
Io *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*, ...);