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-rw-r--r--shell/random.h19
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+/* vi: set sw=4 ts=4: */
+/*
+ * $RANDOM support.
+ *
+ * Copyright (C) 2008 Denys Vlasenko
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+typedef struct random_t {
+ /* Random number generators */
+ int32_t galois_LFSR; /* Galois LFSR (fast but weak). signed! */
+ uint32_t LCG; /* LCG (fast but weak) */
+} random_t;
+
+#define INIT_RANDOM_T(rnd, nonzero, v) \
+ ((rnd)->galois_LFSR = (nonzero), (rnd)->LCG = (v))
+
+uint32_t next_random(random_t *rnd) FAST_FUNC;