X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=shell%2Frandom.h;h=c4eb44c133bb836e4b6d30ba497639444f49610b;hb=5b2cc0aaee6985431d9bab1b49ceea7e1fa1d7af;hp=e22a2e88b53ffca49984c924d6d83772d9c7a8d1;hpb=76ace254e171ee9ca7a13f36335ccad9cc6ae6e1;p=oweals%2Fbusybox.git

diff --git a/shell/random.h b/shell/random.h
index e22a2e88b..c4eb44c13 100644
--- a/shell/random.h
+++ b/shell/random.h
@@ -4,22 +4,38 @@
  *
  * Copyright (C) 2009 Denys Vlasenko
  *
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
  */
+#ifndef SHELL_RANDOM_H
+#define SHELL_RANDOM_H 1
+
+PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
 
 typedef struct random_t {
-	/* Random number generators */
-	int32_t galois_LFSR; /* Galois LFSR (fast but weak). signed! */
-	uint32_t LCG;        /* LCG (fast but weak) */
+	/* State of random number generators: */
+
+	/* Galois LFSR (fast but weak) */
+	int32_t galois_LFSR; /* must be signed! */
+
+	/* LCG (fast but weak) */
+	uint32_t LCG;
+
+	/* 64-bit xorshift (fast, moderate strength) */
+	uint32_t xs64_x;
+	uint32_t xs64_y;
 } random_t;
 
 #define UNINITED_RANDOM_T(rnd) \
 	((rnd)->galois_LFSR == 0)
 
 #define INIT_RANDOM_T(rnd, nonzero, v) \
-	((rnd)->galois_LFSR = (nonzero), (rnd)->LCG = (v))
+	((rnd)->galois_LFSR = (rnd)->xs64_x = (nonzero), (rnd)->LCG = (rnd)->xs64_y = (v))
 
 #define CLEAR_RANDOM_T(rnd) \
 	((rnd)->galois_LFSR = 0)
 
 uint32_t next_random(random_t *rnd) FAST_FUNC;
+
+POP_SAVED_FUNCTION_VISIBILITY
+
+#endif