B_S
assert(bp->b_flags & B_S);
bp->b_flags &= ~B_S;
assert(bp->b_flags & B_S);
bp->b_flags &= ~B_S;
assert(bp->b_flags & B_S);
if (bp->b_flags & B_S) {
bp->b_flags |= B_S;
bp->b_flags |= B_S;
if (bp->b_flags & B_S) {
bp->b_flags |= B_S;
(bp->b_flags & B_S) ? "S" : "",