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#include <u.h>
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#include <libc.h>
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ulong
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umuldiv(ulong a, ulong b, ulong c)
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{
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	double d;
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	d = ((double)a * (double)b) / (double)c;
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	if(d >= 4294967296.)
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		abort();
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	return d;
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}
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long
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muldiv(long a, long b, long c)
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{
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	int s;
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	long v;
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	s = 0;
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	if(a < 0) {
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		s = !s;
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		a = -a;
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	}
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	if(b < 0) {
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		s = !s;
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		b = -b;
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	}
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	if(c < 0) {
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		s = !s;
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		c = -c;
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	}
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	v = umuldiv(a, b, c);
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	if(s)
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		v = -v;
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	return v;
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}