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#define EOF (-1)
#define NBUF 512
struct io{
int fd;
char *bufp, *ebuf, *strp, buf[NBUF];
};
extern struct 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*, ...);
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