Last change
on this file since 3867 was 3621, checked in by Bruno Cornec, 8 years ago |
New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
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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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