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#include <plan9.h>
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long
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readn(int f, void *av, long n)
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{
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	char *a;
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	long m, t;
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	a = av;
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	t = 0;
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	while(t < n){
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		m = read(f, a+t, n-t);
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		if(m <= 0){
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			if(t == 0)
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				return m;
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			break;
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		}
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		t += m;
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	}
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	return t;
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}