diff --git a/lib/buffer.h b/lib/buffer.h
new file mode 100644
index 0000000..7449aa7
--- /dev/null
+++ b/lib/buffer.h
@@ -0,0 +1,77 @@
+/*
+ * Buffering to output and input. 
+ * Copyright (C) 1998 Kunihiro Ishiguro
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra 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, or (at your
+ * option) any later version.
+ *
+ * GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef _ZEBRA_BUFFER_H
+#define _ZEBRA_BUFFER_H
+
+/* Buffer master. */
+struct buffer
+{
+  /* Data list. */
+  struct buffer_data *head;
+  struct buffer_data *tail;
+
+  /* Current allocated data. */
+  unsigned long alloc;
+
+  /* Total length of buffer. */
+  unsigned long size;
+
+  /* For allocation. */
+  struct buffer_data *unused_head;
+  struct buffer_data *unused_tail;
+
+  /* Current total length of this buffer. */
+  unsigned long length;
+};
+
+/* Data container. */
+struct buffer_data
+{
+  struct buffer *parent;
+  struct buffer_data *next;
+  struct buffer_data *prev;
+
+  /* Acctual data stream. */
+  unsigned char *data;
+
+  /* Current pointer. */
+  unsigned long cp;
+
+  /* Start pointer. */
+  unsigned long sp;
+};
+
+/* Buffer prototypes. */
+struct buffer *buffer_new (size_t);
+int buffer_write (struct buffer *, u_char *, size_t);
+void buffer_free (struct buffer *);
+char *buffer_getstr (struct buffer *);
+int buffer_putc (struct buffer *, u_char);
+int buffer_putstr (struct buffer *, u_char *);
+void buffer_reset (struct buffer *);
+int buffer_flush_all (struct buffer *, int);
+int buffer_flush_vty_all (struct buffer *, int, int, int);
+int buffer_flush_window (struct buffer *, int, int, int, int, int);
+int buffer_empty (struct buffer *);
+
+#endif /* _ZEBRA_BUFFER_H */