1 files changed, 18 insertions, 0 deletions
diff --git a/src/lib9/lnrand.c b/src/lib9/lnrand.c
new file mode 100644
index 00000000..5b648d08
--- /dev/null
+++ b/src/lib9/lnrand.c
@@ -0,0 +1,18 @@
+#include	<u.h>
+#include	<libc.h>
+
+#define	MASK	0x7fffffffL
+
+long
+lnrand(long n)
+{
+	long slop, v;
+
+	if(n < 0)
+		return n;
+	slop = MASK % n;
+	do
+		v = lrand();
+	while(v <= slop);
+	return v % n;
+}