Addition of the administration user in the service

Addition of general purpose hashtable (not complete) and users table (not complete)

include/hashtable.h

@@ -0,0 +1,62 @@
+#ifndef _HASTABLE_H
+#define _HASTABLE_H
+/*
+ * This file is distributed as part of the SkySQL Gateway.  It 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,
+ * version 2.
+ *
+ * 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.
+ *
+ * Copyright SkySQL Ab 2013
+ */
+
+/**
+ * @file hashtable.h A general purpose hashtable mechanism for use within the
+ * gateway
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date		Who		Description
+ * 23/06/13	Mark Riddoch	Initial implementation
+ *
+ * @endverbatim
+ */
+
+/**
+ * The entries within a hashtable.
+ *
+ * A NULL value for key indicates an empty entry.
+ * The next pointer is the overflow chain for this hashentry.
+ */
+typedef struct hashentry {
+	void			*key;		/**< The value of the key or NULL if empty entry */
+	void			*value;		/**< The value associated with key */
+	struct	hashentry	*next;		/**< The overflow chain */
+} HASHENTRIES;
+
+/**
+ * The general purpose hashtable struct.
+ */
+typedef struct hashtable {
+	int		hashsize;			/**< The number of HASHENTRIES */
+	HASHENTRIES	*entries;			/**< The entries themselves */
+	int		(*hashfn)(void *);		/**< The hash function */
+	int		(*cmpfn)(void *, void *);	/**< The key comparison function */
+} HASHTABLE;
+
+extern HASHTABLE	*hashtable_alloc(int, int (*hashfn)(),
+					 int (*cmpfn)());		/**< Allocate a hashtable */
+extern void		hashtable_free(HASHTABLE *);			/**< Free a hashtable */
+extern int		hashtable_add(HASHTABLE *, char *, void *);	/**< Add an entry */
+extern int		hashtable_delete(HASHTABLE *, char *);		/**< Delete an entry table */
+extern void		*hashtable_fetch(HASHTABLE *, char *);		/**< Fetch the data for a given key */
+#endif