io.h

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#define	EOF	(-1)
#define	NBUF	512
typedef struct io io;
struct io{
	int fd;
	char *bufp, *ebuf, *strp, 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*, ...);