86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/*-
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* Copyright 2020 Conrad Meyer <cem@FreeBSD.org>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#pragma once
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/*
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* For each of the currently supported random number generators, we have a
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* break value on the amount of state information (you need at least this
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* many bytes of state info to support this random number generator), a degree
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* for the polynomial (actually a trinomial) that the R.N.G. is based on, and
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* the separation between the two lower order coefficients of the trinomial.
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*/
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#define TYPE_0 0 /* linear congruential */
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#define BREAK_0 8
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#define DEG_0 0
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#define SEP_0 0
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#define TYPE_1 1 /* x**7 + x**3 + 1 */
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#define BREAK_1 32
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#define DEG_1 7
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#define SEP_1 3
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#define TYPE_2 2 /* x**15 + x + 1 */
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#define BREAK_2 64
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#define DEG_2 15
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#define SEP_2 1
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#define TYPE_3 3 /* x**31 + x**3 + 1 */
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#define BREAK_3 128
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#define DEG_3 31
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#define SEP_3 3
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#define TYPE_4 4 /* x**63 + x + 1 */
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#define BREAK_4 256
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#define DEG_4 63
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#define SEP_4 1
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/*
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* Array versions of the above information to make code run faster --
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* relies on fact that TYPE_i == i.
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*/
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#define MAX_TYPES 5 /* max number of types above */
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/* A full instance of the random(3) generator. */
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struct __random_state {
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uint32_t *rst_fptr;
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uint32_t *rst_rptr;
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uint32_t *rst_state;
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int rst_type;
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int rst_deg;
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int rst_sep;
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uint32_t *rst_end_ptr;
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/* Flexible array member must be last. */
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uint32_t rst_randtbl[];
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};
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struct __random_state *allocatestate(unsigned type);
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int initstate_r(struct __random_state *, unsigned, uint32_t *, size_t);
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long random_r(struct __random_state *);
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void srandom_r(struct __random_state *, unsigned);
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void srandomdev_r(struct __random_state *);
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