/*
 * call-seq:
 *     ~big  =>  integer
 *
 * Inverts the bits in big. As Bignums are conceptually infinite
 * length, the result acts as if it had an infinite number of one
 * bits to the left. In hex representations, this is displayed
 * as two periods to the left of the digits.
 *  
 *   sprintf("%X", ~0x1122334455)    #=> "..FEEDDCCBBAA"
 */

static VALUE
rb_big_neg(x)
    VALUE x;
{
    VALUE z = rb_big_clone(x);
    long i;
    BDIGIT *ds;

    if (!RBIGNUM(x)->sign) get2comp(z);
    ds = BDIGITS(z);
    i = RBIGNUM(x)->len;
    if (!i) return INT2FIX(~0);
    while (i--) ds[i] = ~ds[i];
    RBIGNUM(z)->sign = !RBIGNUM(z)->sign;
    if (RBIGNUM(x)->sign) get2comp(z);

    return bignorm(z);
}