+/* PSPP - computes sample statistics.
+ Copyright (C) 1997-9, 2000, 2005 Free Software Foundation, Inc.
+ Written by Ben Pfaff <blp@gnu.org>.
+
+ 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 <config.h>
+#include "random.h"
+#include <time.h>
+#include "xalloc.h"
+
+static gsl_rng *rng;
+
+void
+random_init (void)
+{
+}
+
+void
+random_done (void)
+{
+ if (rng != NULL)
+ gsl_rng_free (rng);
+}
+
+/* Returns the current random number generator. */
+gsl_rng *
+get_rng (void)
+{
+ if (rng == NULL)
+ set_rng (time (0));
+ return rng;
+}
+
+/* Initializes or reinitializes the random number generator with
+ the given SEED. */
+void
+set_rng (unsigned long seed)
+{
+ rng = gsl_rng_alloc (gsl_rng_mt19937);
+ if (rng == NULL)
+ xalloc_die ();
+ gsl_rng_set (rng, seed);
+}