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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include "lib.h"
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#include "sys9.h"
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#include <stdio.h>
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ssize_t
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read(int d, void *buf, size_t nbytes)
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{
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	int n, noblock, isbuf;
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	Fdinfo *f;
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	if(d<0 || d>=OPEN_MAX || !(_fdinfo[d].flags&FD_ISOPEN)){
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		errno = EBADF;
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		return -1;
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	}
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	if(nbytes <= 0)
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		return 0;
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	if(buf == 0){
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		errno = EFAULT;
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		return -1;
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	}
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	f = &_fdinfo[d];
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	noblock = f->oflags&O_NONBLOCK;
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	isbuf = f->flags&(FD_BUFFERED|FD_BUFFEREDX);
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	if(noblock || isbuf){
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		if(f->flags&FD_BUFFEREDX) {
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			errno = EIO;
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			return -1;
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		}
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		if(!isbuf) {
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			if(_startbuf(d) != 0) {
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				errno = EIO;
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				return -1;
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			}
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		}
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		n = _readbuf(d, buf, nbytes, noblock);
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	}else{
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		n = _READ(d,  buf, nbytes);
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		if(n < 0)
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			_syserrno();
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	}
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	return n;
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}