dgram_pair_read_inner
static size_t dgram_pair_read_inner(struct bio_dgram_pair_st *b, uint8_t *buf,
l = dgram_pair_read_inner(readb, (uint8_t *)&hdr, sizeof(hdr));
l = dgram_pair_read_inner(readb, (uint8_t *)&hdr, sizeof(hdr));
l = dgram_pair_read_inner(readb, (uint8_t *)buf, sz);
if (trunc > 0 && !ossl_assert(dgram_pair_read_inner(readb, NULL, trunc) == trunc))