Function intersectInterval16s

runcontainer.go:345–367

intersectInterval16s returns the intersection of a and b. The isEmpty flag will be true if a and b were disjoint.

(a, b interval16)

// of a and b. The isEmpty flag will be true if
// a and b were disjoint.
func intersectInterval16s(a, b interval16) (res interval16, isEmpty bool) {
	if !haveOverlap16(a, b) {
		isEmpty = true
		return
	}
	if b.start > a.start {
		res.start = b.start
	} else {
		res.start = a.start
	}

	bEnd := b.last()
	aEnd := a.last()
	var resEnd uint16

	if bEnd < aEnd {
		resEnd = bEnd
	} else {
		resEnd = aEnd
	}
	res.length = resEnd - res.start
	return
}

// union merges two runContainer16s, producing
// a new runContainer16 with the union of rc and b.