Add hostname-related utilities in glib/ghostutils.h

Functions for converting between UTF-8 IDNs (Internationalized Domain
Names) and their ASCII-Compatible Encodings, plus a function to recognize
IP addresses. Part of #548466.

glib/ghostutils.h

@@ -0,0 +1,40 @@
+/* GLIB - Library of useful routines for C programming
+ * Copyright (C) 2008 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
+#error "Only <glib.h> can be included directly."
+#endif
+
+#ifndef __G_HOST_UTILS_H__
+#define __G_HOST_UTILS_H__
+
+#include <glib/gtypes.h>
+
+G_BEGIN_DECLS
+
+gboolean  g_hostname_is_non_ascii     (const gchar *hostname);
+gboolean  g_hostname_is_ascii_encoded (const gchar *hostname);
+gboolean  g_hostname_is_ip_address    (const gchar *hostname);
+
+gchar    *g_hostname_to_ascii         (const gchar *hostname);
+gchar    *g_hostname_to_unicode       (const gchar *hostname);
+
+G_END_DECLS
+
+#endif /* __G_HOST_UTILS_H__ */