Improved error handling

Fixes a memory leak and avoids aggressive busy looping when problems
accessing tty device.

src/error.c

@@ -0,0 +1,35 @@
+/*
+ * tio - the simple TTY terminal I/O application
+ *
+ * Copyright (c) 2014-2016  Martin Lund
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include "tio/options.h"
+#include "tio/print.h"
+
+char *error = "";
+
+void error_exit(void)
+{
+    if ((error[0] != 0) && (option.no_autoconnect))
+        printf("Error: %s\n", error);
+}