+static char *
+format_error_message (const gchar *filename,
+ const gchar *format_string) G_GNUC_FORMAT(2);
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
+
+static char *
+format_error_message (const gchar *filename,
+ const gchar *format_string)
+{
+ gint saved_errno = errno;
+ gchar *display_name;
+ gchar *msg;
+
+ display_name = g_filename_display_name (filename);
+ msg = g_strdup_printf (format_string, display_name, g_strerror (saved_errno));
+ g_free (display_name);
+
+ return msg;
+}
+
+#pragma GCC diagnostic pop
+
+/* format string must have two '%s':
+ *
+ * - the place for the filename
+ * - the place for the strerror
+ */
+static void
+set_file_error (GError **error,
+ const gchar *filename,
+ const gchar *format_string)
+{
+ int saved_errno = errno;
+ char *msg = format_error_message (filename, format_string);
+
+ g_set_error_literal (error, G_FILE_ERROR, g_file_error_from_errno (saved_errno),
+ msg);
+ g_free (msg);
+}
+