Linux_SDK_V0.9.5Linux_SDK_V0.9.5

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/rand.c b/lib/rand.c
new file mode 100644
index 00000000..d256baf5
--- /dev/null
+++ b/lib/rand.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Simple xorshift PRNG
+ *   see http://www.jstatsoft.org/v08/i14/paper
+ *
+ * Copyright (c) 2012 Michael Walle
+ * Michael Walle <michael@walle.cc>
+ */
+
+#include <common.h>
+#include <rand.h>
+
+static unsigned int y = 1U;
+
+unsigned int rand_r(unsigned int *seedp)
+{
+	*seedp ^= (*seedp << 13);
+	*seedp ^= (*seedp >> 17);
+	*seedp ^= (*seedp << 5);
+
+	return *seedp;
+}
+
+unsigned int rand(void)
+{
+	return rand_r(&y);
+}
+
+void srand(unsigned int seed)
+{
+	y = seed;
+}