Addition of the administration user in the service

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

core/users.c

@@ -0,0 +1,67 @@
+/*
+ * 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
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <users.h>
+
+/**
+ * @file users.c User table maintenance routines
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date		Who		Description
+ * 23/06/13	Mark Riddoch	Initial implementation
+ *
+ * @endverbatim
+ */
+
+/**
+ * The hash function we user for storing users.
+ *
+ * @param key	The key value, i.e. username
+ * @return The hash key
+ */
+static int
+user_hash(char *key)
+{
+	return (*key + *(key + 1)) % 52;
+}
+
+/**
+ * Allocate a new users table
+ *
+ * @return The users table
+ */
+USERS *
+users_alloc()
+{
+USERS 	*rval;
+
+	if ((rval = malloc(sizeof(USERS))) == NULL)
+		return NULL;
+
+	if ((rval->data = hashtable_alloc(52, user_hash, strcmp)) == NULL)
+	{
+		free(rval);
+		return NULL;
+	}
+
+	return rval;
+}
+