+SV *
+Perl_refcounted_he_fetch(pTHX_ const struct refcounted_he *chain, SV *keysv,
+ const char *key, STRLEN klen, int flags, U32 hash)
+{
+ dVAR;
+ /* Just to be awkward, if you're using this interface the UTF-8-or-not-ness
+ of your key has to exactly match that which is stored. */
+ SV *value = &PL_sv_placeholder;
+ bool is_utf8;
+
+ if (keysv) {
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
+ key = SvPV_const(keysv, klen);
+ flags = 0;
+ is_utf8 = (SvUTF8(keysv) != 0);
+ } else {
+ is_utf8 = ((flags & HVhek_UTF8) ? TRUE : FALSE);
+ }
+
+ if (!hash) {
+ if (keysv && (SvIsCOW_shared_hash(keysv))) {
+ hash = SvSHARED_HASH(keysv);
+ } else {
+ PERL_HASH(hash, key, klen);
+ }
+ }
+
+ for (; chain; chain = chain->refcounted_he_next) {
+#ifdef USE_ITHREADS
+ if (hash != chain->refcounted_he_hash)
+ continue;
+ if (klen != chain->refcounted_he_keylen)
+ continue;
+ if (memNE(REF_HE_KEY(chain),key,klen))
+ continue;
+ if (!!is_utf8 != !!(chain->refcounted_he_data[0] & HVhek_UTF8))
+ continue;
+#else
+ if (hash != HEK_HASH(chain->refcounted_he_hek))
+ continue;
+ if (klen != (STRLEN)HEK_LEN(chain->refcounted_he_hek))
+ continue;
+ if (memNE(HEK_KEY(chain->refcounted_he_hek),key,klen))
+ continue;
+ if (!!is_utf8 != !!HEK_UTF8(chain->refcounted_he_hek))
+ continue;
+#endif
+
+ value = sv_2mortal(refcounted_he_value(chain));
+ break;
+ }
+
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
+
+ return value;
+}
+