From f85676749888e99fec419236d4823fe6250eddd1 Mon Sep 17 00:00:00 2001
From: Justin Bedo <cu@cua0.org>
Date: Sat, 10 Aug 2013 08:36:48 +1000
Subject: Initial import

---
 frand.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 frand.c

(limited to 'frand.c')

diff --git a/frand.c b/frand.c
new file mode 100644
index 0000000..e13e1d8
--- /dev/null
+++ b/frand.c
@@ -0,0 +1,17 @@
+#include	<u.h>
+#include	<libc.h>
+
+#define	MASK	0x7fffffffL
+#define	NORM	(1.0/(1.0+MASK))
+
+double
+frand(void)
+{
+	double x;
+
+	do {
+		x = lrand() * NORM;
+		x = (x + lrand()) * NORM;
+	} while(x >= 1);
+	return x;
+}
-- 
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