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/* gmp_randinit_lc_2exp (state, a, c, m2exp) -- Initialize random
state STATE for a linear congruential generator with multiplier A,
adder C, and modulus 2 ^ M2EXP.
Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include "gmp.h"
#include "gmp-impl.h"
void
#if __STDC__
gmp_randinit_lc_2exp (gmp_randstate_t rstate,
mpz_t a,
unsigned long int c,
unsigned long int m2exp)
#else
gmp_randinit_lc_2exp (rstate, a, c, m2exp)
gmp_randstate_t rstate;
mpz_t a;
unsigned long int c;
unsigned long int m2exp;
#endif
{
mpz_init_set_ui (rstate->seed, 1);
_mpz_realloc (rstate->seed, m2exp / BITS_PER_MP_LIMB
+ (m2exp % BITS_PER_MP_LIMB != 0));
/* Allocate algorithm specific data. */
rstate->algdata.lc = (__gmp_randata_lc *)
(*_mp_allocate_func) (sizeof (__gmp_randata_lc));
mpz_init_set (rstate->algdata.lc->a, a);
rstate->algdata.lc->c = c;
/* Cover weird case where m2exp is 0, which means that m is used
instead of m2exp. */
if (m2exp == 0)
mpz_init_set_ui (rstate->algdata.lc->m, 0);
rstate->algdata.lc->m2exp = m2exp;
rstate->alg = GMP_RAND_ALG_LC;
}
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