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Last change
on this file since 3647 was 3621, checked in by Bruno Cornec, 10 years ago |
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New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
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Property svn:eol-style
set to
native
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File size:
871 bytes
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| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * $RANDOM support.
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| 4 | *
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| 5 | * Copyright (C) 2009 Denys Vlasenko
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| 6 | *
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| 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 8 | */
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| 9 | #ifndef SHELL_RANDOM_H
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| 10 | #define SHELL_RANDOM_H 1
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| 11 |
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| 12 | PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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| 13 |
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| 14 | typedef struct random_t {
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| 15 | /* State of random number generators: */
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| 16 |
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| 17 | /* Galois LFSR (fast but weak) */
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| 18 | int32_t galois_LFSR; /* must be signed! */
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| 19 |
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| 20 | /* LCG (fast but weak) */
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| 21 | uint32_t LCG;
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| 22 |
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| 23 | /* 64-bit xorshift (fast, moderate strength) */
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| 24 | uint32_t xs64_x;
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| 25 | uint32_t xs64_y;
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| 26 | } random_t;
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| 27 |
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| 28 | #define UNINITED_RANDOM_T(rnd) \
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| 29 | ((rnd)->galois_LFSR == 0)
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| 30 |
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| 31 | #define INIT_RANDOM_T(rnd, nonzero, v) \
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| 32 | ((rnd)->galois_LFSR = (rnd)->xs64_x = (nonzero), (rnd)->LCG = (rnd)->xs64_y = (v))
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| 33 |
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| 34 | #define CLEAR_RANDOM_T(rnd) \
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| 35 | ((rnd)->galois_LFSR = 0)
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| 36 |
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| 37 | uint32_t next_random(random_t *rnd) FAST_FUNC;
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| 38 |
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| 39 | POP_SAVED_FUNCTION_VISIBILITY
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| 40 |
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| 41 | #endif
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