GNUmifluz: BT_STK_NUM

do { \
 if ((ret = \
 (c)->csp == (c)->esp ? CDB___bam_stkgrow(dbenv, c) : 0) == 0) { \
 (c)->csp->page = NULL; \
 (c)->csp->indx = page_indx; \
 (c)->csp->entries = NUM_ENT(pagep); \
 (c)->csp->lock.off = LOCK_INVALID; \
 (c)->csp->lock_mode = DB_LOCK_NG; \
 } \
} while (0)