__hdr
DBT __hdr;
__hdr.data = &__bk;
__hdr.size = SSZA(BKEYDATA, data);
BKEYDATA_SIZE(data->size), &__hdr, data);
DBT __hdr; \
memset(&__hdr, 0, sizeof(__hdr)); \
__hdr.data = &bo; \
__hdr.size = BOVERFLOW_SIZE; \
h, indx, BOVERFLOW_SIZE, &__hdr, NULL)) != 0) \
struct __hdr; typedef struct __hdr HDR;