libusbgx: Introduce usbg_cleanup_function_attrs() function

We would like to eliminate static buffers from function
attributes. To achieve this we should ensure that there
is some function which free the memory allocated
in usbg_get_function_attrs()

Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Reviewed-by: Pawel Szewczyk <p.szewczyk@samsung.com>
Reviewed-by: Philippe De Swert <philippedeswert@gmail.com>

examples/show-gadgets.c

@@ -132,6 +132,8 @@ void show_function(usbg_function *f)
 	default:
 		fprintf(stdout, "    UNKNOWN\n");
 	}
+
+	usbg_cleanup_function_attrs(&f_attrs);
 }
 
 void show_config(usbg_config *c)

include/usbg/usbg.h

@@ -710,6 +710,16 @@ extern int usbg_lookup_function_type(const char *name);
  */
 extern int usbg_lookup_function_attrs_type(int f_type);
 
+/**
+ * @brief Cleanup content of function attributes
+ * @param f_attrs function attributes which should be cleaned up.
+ * @note This function should be called to free
+ * additional memory allocated by usbg_get_function_attrs().
+ * @warning None of attributes in passed structure should be
+ * accessed after returning from this function.
+ */
+extern void usbg_cleanup_function_attrs(usbg_function_attrs *f_attrs);
+
 /* USB configurations allocation and configuration */
 
 /**

src/usbg.c

@@ -2581,6 +2581,29 @@ int usbg_get_function_attrs(usbg_function *f, usbg_function_attrs *f_attrs)
 			: USBG_ERROR_INVALID_PARAM;
 }
 
+void usbg_cleanup_function_attrs(usbg_function_attrs *f_attrs)
+{
+	if (!f_attrs)
+		return;
+
+	switch (f_attrs->header.attrs_type) {
+	case USBG_F_ATTRS_SERIAL:
+		break;
+
+	case USBG_F_ATTRS_NET:
+		break;
+
+	case USBG_F_ATTRS_PHONET:
+		break;
+
+	case USBG_F_ATTRS_FFS:
+		break;
+	default:
+		ERROR("Unsupported attrs type\n");
+		break;
+	}
+}
+
 int usbg_set_function_net_attrs(usbg_function *f, const usbg_f_net_attrs *attrs)
 {
 	int ret = USBG_SUCCESS;

src/usbg_schemes_libconfig.c

@@ -397,6 +397,7 @@ static int usbg_export_function_attrs(usbg_function *f, config_setting_t *root)
 		ret = USBG_ERROR_NOT_SUPPORTED;
 	}
 
+	usbg_cleanup_function_attrs(&f_attrs);
 out:
 	return ret;
 }