1  /* Test the Mersenne Twister random number generator.
       2  
       3  Copyright 2002 Free Software Foundation, Inc.
       4  
       5  This file is part of the GNU MP Library test suite.
       6  
       7  The GNU MP Library test suite is free software; you can redistribute it
       8  and/or modify it under the terms of the GNU General Public License as
       9  published by the Free Software Foundation; either version 3 of the License,
      10  or (at your option) any later version.
      11  
      12  The GNU MP Library test suite is distributed in the hope that it will be
      13  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
      14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
      15  Public License for more details.
      16  
      17  You should have received a copy of the GNU General Public License along with
      18  the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
      19  
      20  #include <stdio.h>
      21  #include "gmp-impl.h"
      22  #include "tests.h"
      23  
      24  #ifndef TRUE
      25  #define TRUE (1)
      26  #endif
      27  #ifndef FALSE
      28  #define FALSE (0)
      29  #endif
      30  
      31  /* Test that the sequence without seeding equals the sequence with the
      32     default seed.  */
      33  int
      34  chk_default_seed (void)
      35  {
      36    gmp_randstate_t r1, r2;
      37    mpz_t a, b;
      38    int i;
      39    int ok = TRUE;
      40  
      41    mpz_init2 (a, 19936L);
      42    mpz_init2 (b, 19936L);
      43  
      44    gmp_randinit_mt (r1);
      45    gmp_randinit_mt (r2);
      46    gmp_randseed_ui (r2, 5489L); /* Must match DEFAULT_SEED in randmt.c */
      47    for (i = 0; i < 3; i++)
      48      {
      49        /* Extract one whole buffer per iteration.  */
      50        mpz_urandomb (a, r1, 19936L);
      51        mpz_urandomb (b, r2, 19936L);
      52        if (mpz_cmp (a, b) != 0)
      53  	{
      54  	  ok = FALSE;
      55  	  printf ("Default seed fails in iteration %d\n", i);
      56  	  break;
      57  	}
      58      }
      59    gmp_randclear (r1);
      60    gmp_randclear (r2);
      61  
      62    mpz_clear (a);
      63    mpz_clear (b);
      64    return ok;
      65  }
      66  
      67  int
      68  main (int argc, char *argv[])
      69  {
      70    int ok;
      71  
      72    tests_start ();
      73  
      74    ok = chk_default_seed ();
      75  
      76    tests_end ();
      77  
      78    if (ok)
      79      return 0; /* pass */
      80    else
      81      return 1; /* fail */
      82  }