+static const char *get_esn(Z_RecordComposition *comp)
+{
+ if (comp && comp->which == Z_RecordComp_complex)
+ {
+ if (comp->u.complex->generic
+ && comp->u.complex->generic->elementSpec
+ && (comp->u.complex->generic->elementSpec->which ==
+ Z_ElementSpec_elementSetName))
+ return comp->u.complex->generic->elementSpec->u.elementSetName;
+ }
+ else if (comp && comp->which == Z_RecordComp_simple &&
+ comp->u.simple->which == Z_ElementSetNames_generic)
+ return comp->u.simple->u.generic;
+ return 0;
+}
+
+static void set_esn(Z_RecordComposition **comp_p, const char *esn, NMEM nmem)
+{
+ Z_RecordComposition *comp = nmem_malloc(nmem, sizeof(*comp));
+
+ comp->which = Z_RecordComp_simple;
+ comp->u.simple = nmem_malloc(nmem, sizeof(*comp->u.simple));
+ comp->u.simple->which = Z_ElementSetNames_generic;
+ comp->u.simple->u.generic = nmem_strdup(nmem, esn);
+ *comp_p = comp;
+}
+
+static int retrieve_fetch(association *assoc, bend_fetch_rr *rr)
+{
+#if YAZ_HAVE_XML2
+ yaz_record_conv_t rc = 0;
+ const char *match_schema = 0;
+ int *match_syntax = 0;
+
+ if (assoc->server)
+ {
+ int r;
+ const char *input_schema = get_esn(rr->comp);
+ Odr_oid *input_syntax_raw = rr->request_format_raw;
+
+ const char *backend_schema = 0;
+ Odr_oid *backend_syntax = 0;
+
+ r = yaz_retrieval_request(assoc->server->retrieval,
+ input_schema,
+ input_syntax_raw,
+ &match_schema,
+ &match_syntax,
+ &rc,
+ &backend_schema,
+ &backend_syntax);
+ if (r == -1) /* error ? */
+ {
+ const char *details = yaz_retrieval_get_error(
+ assoc->server->retrieval);
+
+ rr->errcode = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
+ if (details)
+ rr->errstring = odr_strdup(rr->stream, details);
+ return -1;
+ }
+ else if (r == 1 || r == 3)
+ {
+ const char *details = input_schema;
+ rr->errcode = YAZ_BIB1_ELEMENT_SET_NAMES_UNSUPP;
+ if (details)
+ rr->errstring = odr_strdup(rr->stream, details);
+ return -1;
+ }
+ else if (r == 2)
+ {
+ rr->errcode = YAZ_BIB1_RECORD_SYNTAX_UNSUPP;
+ if (input_syntax_raw)
+ {
+ char oidbuf[OID_STR_MAX];
+ oid_to_dotstring(input_syntax_raw, oidbuf);
+ rr->errstring = odr_strdup(rr->stream, oidbuf);
+ }
+ return -1;
+ }
+ if (backend_schema)
+ {
+ set_esn(&rr->comp, backend_schema, rr->stream->mem);
+ }
+ if (backend_syntax)
+ {
+ oident *oident_syntax = oid_getentbyoid(backend_syntax);
+
+ rr->request_format_raw = backend_syntax;
+
+ if (oident_syntax)
+ rr->request_format = oident_syntax->value;
+ else
+ rr->request_format = VAL_NONE;
+ }
+ }
+ (*assoc->init->bend_fetch)(assoc->backend, rr);
+ if (rc && rr->record && rr->errcode == 0 && rr->len > 0)
+ { /* post conversion must take place .. */
+ WRBUF output_record = wrbuf_alloc();
+ int r = yaz_record_conv_record(rc, rr->record, rr->len, output_record);
+ if (r)
+ {
+ const char *details = yaz_record_conv_get_error(rc);
+ rr->errcode = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
+ if (details)
+ rr->errstring = odr_strdup(rr->stream, details);
+ }
+ else
+ {
+ rr->len = wrbuf_len(output_record);
+ rr->record = odr_malloc(rr->stream, rr->len);
+ memcpy(rr->record, wrbuf_buf(output_record), rr->len);
+ }
+ wrbuf_free(output_record, 1);
+ }
+ if (match_syntax)
+ {
+ struct oident *oi = oid_getentbyoid(match_syntax);
+ rr->output_format = oi ? oi->value : VAL_NONE;
+ rr->output_format_raw = match_syntax;
+ }
+ if (match_schema)
+ rr->schema = odr_strdup(rr->stream, match_schema);
+ return 0;
+#else
+ (*assoc->init->bend_fetch)(assoc->backend, rr);
+#endif
+}
+