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#include <u.h>
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#include <libc.h>
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#include <fcall.h>
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int
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read9pmsg(int fd, void *abuf, uint n)
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{
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	int m, len;
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	uchar *buf;
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	buf = abuf;
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	/* read count */
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	m = readn(fd, buf, BIT32SZ);
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	if(m != BIT32SZ){
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		if(m < 0)
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			return -1;
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		return 0;
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	}
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	len = GBIT32(buf);
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	if(len <= BIT32SZ || len > n){
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		werrstr("bad length in 9P2000 message header");
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		return -1;
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	}
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	len -= BIT32SZ;
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	m = readn(fd, buf+BIT32SZ, len);
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	if(m < len)
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		return 0;
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	return BIT32SZ+m;
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}