shell: some additions to *sh-misc/* tests

[oweals/busybox.git] / shell / random.h

diff --git a/shell/random.h b/shell/random.h
index 08563402cba05e961911908161acffddcd95a830..c4eb44c133bb836e4b6d30ba497639444f49610b 100644 (file)
--- a/shell/random.h
+++ b/shell/random.h
@@ -4,7 +4,7 @@
  *
  * 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
@@ -12,16 +12,24 @@
 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)