kc3-lang/gnulib/tests/test-random.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• tests/test-random.c

• /* Test random.
     Copyright (C) 2008-2023 Free Software Foundation, Inc.
  
     This program 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.
  
     This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  #include <stdlib.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (srandom, void, (unsigned int));
  SIGNATURE_CHECK (initstate, char *, (unsigned int, char *, size_t));
  SIGNATURE_CHECK (setstate, char *, (char *));
  SIGNATURE_CHECK (random, long, (void));
  
  #include <time.h>
  
  #include "macros.h"
  
  int
  main ()
  {
    char buf[128];
    unsigned int i;
    unsigned int n_big = 0;
  
    initstate (time (NULL), buf, sizeof buf);
    for (i = 0; i < 1000; i++)
      {
        long r = random ();
        ASSERT (0 <= r);
        if (RAND_MAX / 2 < r)
          ++n_big;
      }
  
    /* Fail if none of the numbers were larger than RAND_MAX / 2.  */
    return !n_big;
  }
  

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