[xfer] Expose xfer_uri_opener()

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/core/open.c

  *
  */
 
+/**
+ * Find opener for URI scheme
+ *
+ * @v scheme		URI scheme
+ * @ret opener		Opener, or NULL
+ */
+struct uri_opener * xfer_uri_opener ( const char *scheme ) {
+	struct uri_opener *opener;
+
+	for_each_table_entry ( opener, URI_OPENERS ) {
+		if ( strcmp ( scheme, opener->scheme ) == 0 )
+			return opener;
+	}
+	return NULL;
+}
+
 /**
  * Open URI
  *
 int xfer_open_uri ( struct interface *intf, struct uri *uri ) {
 	struct uri_opener *opener;
 	struct uri *resolved_uri;
-	int rc = -ENOTSUP;
+	int rc;
 
 	/* Resolve URI */
 	resolved_uri = resolve_uri ( cwuri, uri );
-	if ( ! resolved_uri )
-		return -ENOMEM;
+	if ( ! resolved_uri ) {
+		rc = -ENOMEM;
+		goto err_resolve_uri;
+	}
 
 	/* Find opener which supports this URI scheme */
-	for_each_table_entry ( opener, URI_OPENERS ) {
-		if ( strcmp ( resolved_uri->scheme, opener->scheme ) == 0 ) {
-			DBGC ( INTF_COL ( intf ), "INTF " INTF_FMT
-			       " opening %s URI\n", INTF_DBG ( intf ),
-			       resolved_uri->scheme );
-			rc = opener->open ( intf, resolved_uri );
-			goto done;
-		}
+	opener = xfer_uri_opener ( resolved_uri->scheme );
+	if ( ! opener ) {
+		DBGC ( INTF_COL ( intf ), "INTF " INTF_FMT " attempted to open "
+		       "unsupported URI scheme \"%s\"\n",
+		       INTF_DBG ( intf ), resolved_uri->scheme );
+		rc = -ENOTSUP;
+		goto err_opener;
 	}
-	DBGC ( INTF_COL ( intf ), "INTF " INTF_FMT " attempted to open "
-	       "unsupported URI scheme \"%s\"\n",
+
+	/* Call opener */
+	DBGC ( INTF_COL ( intf ), "INTF " INTF_FMT " opening %s URI\n",
 	       INTF_DBG ( intf ), resolved_uri->scheme );
+	if ( ( rc = opener->open ( intf, resolved_uri ) ) != 0 ) {
+		DBGC ( INTF_COL ( intf ), "INTF " INTF_FMT " could not open: "
+		       "%s\n", INTF_DBG ( intf ), strerror ( rc ) );
+		goto err_open;
+	}
 
- done:
+ err_open:
+ err_opener:
 	uri_put ( resolved_uri );
+ err_resolve_uri:
 	return rc;
 }
 

src/include/ipxe/open.h

 /** Register a socket opener */
 #define __socket_opener __table_entry ( SOCKET_OPENERS, 01 )
 
+extern struct uri_opener * xfer_uri_opener ( const char *scheme );
 extern int xfer_open_uri ( struct interface *intf, struct uri *uri );
 extern int xfer_open_uri_string ( struct interface *intf,
 				  const char *uri_string );