From 0fc65b37a1e7585ca2347bf61dcb8bc3a6b146a4 Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Sun, 21 Mar 2004 14:04:56 +0000
Subject: Add most of libsec.

---
 src/libsec/port/nfastrand.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 src/libsec/port/nfastrand.c

(limited to 'src/libsec/port/nfastrand.c')

diff --git a/src/libsec/port/nfastrand.c b/src/libsec/port/nfastrand.c
new file mode 100644
index 00000000..3ba77003
--- /dev/null
+++ b/src/libsec/port/nfastrand.c
@@ -0,0 +1,23 @@
+#include <u.h>
+#include <libc.h>
+#include <libsec.h>
+
+#define Maxrand	((1UL<<31)-1)
+
+ulong
+nfastrand(ulong n)
+{
+	ulong m, r;
+	
+	/*
+	 * set m to the maximum multiple of n <= 2^31-1
+	 * so we want a random number < m.
+	 */
+	if(n > Maxrand)
+		sysfatal("nfastrand: n too large");
+
+	m = Maxrand - Maxrand % n;
+	while((r = fastrand()) >= m)
+		;
+	return r%n;
+}
-- 
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