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34 lines
741 B
C
34 lines
741 B
C
/* vi: set sw=4 ts=4: */
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/*
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* $RANDOM support.
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*
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* Copyright (C) 2009 Denys Vlasenko
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#ifndef SHELL_RANDOM_H
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#define SHELL_RANDOM_H 1
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PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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typedef struct random_t {
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/* Random number generators */
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int32_t galois_LFSR; /* Galois LFSR (fast but weak). signed! */
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uint32_t LCG; /* LCG (fast but weak) */
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} random_t;
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#define UNINITED_RANDOM_T(rnd) \
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((rnd)->galois_LFSR == 0)
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#define INIT_RANDOM_T(rnd, nonzero, v) \
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((rnd)->galois_LFSR = (nonzero), (rnd)->LCG = (v))
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#define CLEAR_RANDOM_T(rnd) \
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((rnd)->galois_LFSR = 0)
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uint32_t next_random(random_t *rnd) FAST_FUNC;
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POP_SAVED_FUNCTION_VISIBILITY
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#endif
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