set_buf_states
count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
return set_buf_states(q, bufnr, state, 1);
set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
set_buf_states(q, q->u.in.batch_start, SLSB_P_INPUT_NOT_INIT,