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Annotation of OpenXM_contrib/gmp/randlc2x.c, Revision 1.1.1.2

1.1       maekawa     1: /* gmp_randinit_lc_2exp (state, a, c, m2exp) -- Initialize random
                      2:    state STATE for a linear congruential generator with multiplier A,
                      3:    adder C, and modulus 2 ^ M2EXP.
                      4:
1.1.1.2 ! ohara       5: Copyright 2000, 2002 Free Software Foundation, Inc.
1.1       maekawa     6:
                      7: This file is part of the GNU MP Library.
                      8:
                      9: The GNU MP Library is free software; you can redistribute it and/or modify
                     10: it under the terms of the GNU Lesser General Public License as published by
                     11: the Free Software Foundation; either version 2.1 of the License, or (at your
                     12: option) any later version.
                     13:
                     14: The GNU MP Library is distributed in the hope that it will be useful, but
                     15: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     16: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     17: License for more details.
                     18:
                     19: You should have received a copy of the GNU Lesser General Public License
                     20: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     21: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     22: MA 02111-1307, USA. */
                     23:
                     24: #include "gmp.h"
                     25: #include "gmp-impl.h"
                     26:
                     27: void
                     28: gmp_randinit_lc_2exp (gmp_randstate_t rstate,
1.1.1.2 ! ohara      29:                      mpz_srcptr a,
1.1       maekawa    30:                      unsigned long int c,
                     31:                      unsigned long int m2exp)
                     32: {
1.1.1.2 ! ohara      33:   mpz_init_set_ui (rstate->_mp_seed, 1);
        !            34:   _mpz_realloc (rstate->_mp_seed, (m2exp + GMP_NUMB_BITS - 1) / GMP_NUMB_BITS);
1.1       maekawa    35:
                     36:   /* Allocate algorithm specific data. */
1.1.1.2 ! ohara      37:   rstate->_mp_algdata._mp_lc = (__gmp_randata_lc *)
        !            38:     (*__gmp_allocate_func) (sizeof (__gmp_randata_lc));
1.1       maekawa    39:
1.1.1.2 ! ohara      40:   mpz_init_set (rstate->_mp_algdata._mp_lc->_mp_a, a);
        !            41:   rstate->_mp_algdata._mp_lc->_mp_c = c;
1.1       maekawa    42:
                     43:   /* Cover weird case where m2exp is 0, which means that m is used
                     44:      instead of m2exp.  */
                     45:   if (m2exp == 0)
1.1.1.2 ! ohara      46:     mpz_init_set_ui (rstate->_mp_algdata._mp_lc->_mp_m, 0);
        !            47:   rstate->_mp_algdata._mp_lc->_mp_m2exp = m2exp;
1.1       maekawa    48:
1.1.1.2 ! ohara      49:   rstate->_mp_alg = GMP_RAND_ALG_LC;
1.1       maekawa    50: }