conn: add state checking API

New boolean functions:
  xmpp_conn_is_connecting()
  xmpp_conn_is_connected()
  xmpp_conn_is_disconnected()

These functions are backported from UnrealEngine project.

ChangeLog

@@ -3,6 +3,9 @@
 	- LibreSSL support
 	- New API:
 		- xmpp_stanza_get_child_by_name_and_ns()
+		- xmpp_conn_is_connecting()
+		- xmpp_conn_is_connected()
+		- xmpp_conn_is_disconnected()
 
 0.9.3
 	- PLAIN mechanism is used only when no other mechanisms are supported

src/conn.c

@@ -1002,6 +1002,37 @@ int xmpp_conn_is_secured(xmpp_conn_t * const conn)
     return conn->secured && !conn->tls_failed && conn->tls != NULL ? 1 : 0;
 }
 
+/**
+ *  @return TRUE if connection is in connecting state and FALSE otherwise
+ *
+ *  @ingroup Connections
+ */
+int xmpp_conn_is_connecting(xmpp_conn_t * const conn)
+{
+    return conn->state == XMPP_STATE_CONNECTING ? 1 : 0;
+}
+
+/**
+ *  @return TRUE if connection is in connected state and FALSE otherwise
+ *
+ *  @ingroup Connections
+ */
+int xmpp_conn_is_connected(xmpp_conn_t * const conn)
+{
+    return conn->state == XMPP_STATE_CONNECTED ? 1 : 0;
+}
+
+/**
+ *  @return TRUE if connection is in disconnected state and FALSE otherwise
+ *
+ *  @ingroup Connections
+ */
+int xmpp_conn_is_disconnected(xmpp_conn_t * const conn)
+{
+    return conn->state == XMPP_STATE_DISCONNECTED ? 1 : 0;
+}
+
+
 /* timed handler for cleanup if normal disconnect procedure takes too long */
 static int _disconnect_cleanup(xmpp_conn_t * const conn,
                                void * const userdata)

strophe.h

@@ -237,6 +237,9 @@ xmpp_ctx_t *xmpp_conn_get_context(xmpp_conn_t * const conn);
 void xmpp_conn_disable_tls(xmpp_conn_t * const conn);
 int xmpp_conn_is_secured(xmpp_conn_t * const conn);
 void xmpp_conn_set_keepalive(xmpp_conn_t * const conn, int timeout, int interval);
+int xmpp_conn_is_connecting(xmpp_conn_t * const conn);
+int xmpp_conn_is_connected(xmpp_conn_t * const conn);
+int xmpp_conn_is_disconnected(xmpp_conn_t * const conn);
 
 int xmpp_connect_client(xmpp_conn_t * const conn, 
 			  const char * const altdomain,