Adjust for monotone.
diff --git a/lib/next_prime.c b/lib/next_prime.c
new file mode 100644
index 0000000..5d60804
--- /dev/null
+++ b/lib/next_prime.c
@@ -0,0 +1,54 @@
+/* Determine prime number.
+ Copyright (C) 2000, 2002 Free Software Foundation, Inc.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2000.
+
+ 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include <stddef.h>
+
+
+/* Test whether CANDIDATE is a prime. */
+static int
+is_prime (size_t candidate)
+{
+ /* No even number and none less than 10 will be passed here. */
+ size_t divn = 3;
+ size_t sq = divn * divn;
+
+ while (sq < candidate && candidate % divn != 0)
+ {
+ size_t old_sq = sq;
+ ++divn;
+ sq += 4 * divn;
+ if (sq < old_sq)
+ return 1;
+ ++divn;
+ }
+
+ return candidate % divn != 0;
+}
+
+
+/* We need primes for the table size. */
+size_t
+next_prime (size_t seed)
+{
+ /* Make it definitely odd. */
+ seed |= 1;
+
+ while (!is_prime (seed))
+ seed += 2;
+
+ return seed;
+}