Linear array rotation

const rotate = (array, a, b, c) => {
    for (;;) {
        const n1 = b - a;
        const n2 = c - b;
        if (n1 === 0 || n2 === 0) break;
        const len = c - a;
        const min = n1 < n2? n1: n2;
        const max = len - min;
        if (n1 === max) {
            const end = c - 1 - n1;
            for (let i=c-1; i>end; --i) {
                const j = i - n2;
                const aux = array[i];
                array[i] = array[j];
                array[j] = aux;
            }
        } else {
            const end = a + n2;
            for (let i=a; i<end; ++i) {
                const j = i + n1;
                const aux = array[i];
                array[i] = array[j];
                array[j] = aux;
            }
        }
        const rotations = max % min;
        if (rotations === 0) break;
        if (n1 === max) {
            c = a + min;
            b = a + rotations;
        } else {
            a += max;
            b = c - rotations;
        }
    }
};