third_party/gmp/tests/rand/t-mt.c

/* Test the Mersenne Twister random number generator.

Copyright 2002 Free Software Foundation, Inc.

This file is part of the GNU MP Library test suite.

The GNU MP Library test suite is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.

The GNU MP Library test suite 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 General
Public License for more details.

You should have received a copy of the GNU General Public License along with
the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */

#include <stdio.h>
#include "gmp-impl.h"
#include "tests.h"

#ifndef TRUE
#define TRUE (1)
#endif
#ifndef FALSE
#define FALSE (0)
#endif

/* Test that the sequence without seeding equals the sequence with the
   default seed.  */
int
chk_default_seed (void)
{
  gmp_randstate_t r1, r2;
  mpz_t a, b;
  int i;
  int ok = TRUE;

  mpz_init2 (a, 19936L);
  mpz_init2 (b, 19936L);

  gmp_randinit_mt (r1);
  gmp_randinit_mt (r2);
  gmp_randseed_ui (r2, 5489L); /* Must match DEFAULT_SEED in randmt.c */
  for (i = 0; i < 3; i++)
    {
      /* Extract one whole buffer per iteration.  */
      mpz_urandomb (a, r1, 19936L);
      mpz_urandomb (b, r2, 19936L);
      if (mpz_cmp (a, b) != 0)
	{
	  ok = FALSE;
	  printf ("Default seed fails in iteration %d\n", i);
	  break;
	}
    }
  gmp_randclear (r1);
  gmp_randclear (r2);

  mpz_clear (a);
  mpz_clear (b);
  return ok;
}

int
main (int argc, char *argv[])
{
  int ok;

  tests_start ();

  ok = chk_default_seed ();

  tests_end ();

  if (ok)
    return 0; /* pass */
  else
    return 1; /* fail */
}