SB_IT_LAST_CB
ctx.flags |= SB_IT_LAST_VOI | SB_IT_LAST_CB;
SB_IT_LAST_CB;
ctx.flags &= ~SB_IT_LAST_CB;
if (ctx->flags & SB_IT_LAST_CB)
sbv.flags = ctx->flags & (SB_IT_FIRST_CB | SB_IT_LAST_CB |