1  /* Test for sizeinbase function.
       2  
       3  Copyright 2014 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  
      21  #include <stdlib.h>
      22  #include <stdio.h>
      23  
      24  #include "gmp-impl.h"
      25  #include "tests.h"
      26  
      27  /* Exponents up to 2^SIZE_LOG */
      28  #ifndef SIZE_LOG
      29  #define SIZE_LOG 13
      30  #endif
      31  
      32  #ifndef COUNT
      33  #define COUNT 30
      34  #endif
      35  
      36  #define MAX_N (1<<SIZE_LOG)
      37  
      38  int
      39  main (int argc, char **argv)
      40  {
      41    mp_limb_t a;
      42    mp_ptr pp, scratch;
      43    mp_limb_t max_b;
      44    int count = COUNT;
      45    int test;
      46    gmp_randstate_ptr rands;
      47    TMP_DECL;
      48  
      49    TESTS_REPS (count, argv, argc);
      50  
      51    tests_start ();
      52    TMP_MARK;
      53    rands = RANDS;
      54  
      55    pp = TMP_ALLOC_LIMBS (MAX_N);
      56    scratch = TMP_ALLOC_LIMBS (MAX_N);
      57    max_b = numberof (mp_bases);
      58  
      59    ASSERT_ALWAYS (max_b > 62);
      60    ASSERT_ALWAYS (max_b < GMP_NUMB_MAX);
      61  
      62    for (a = 2; a < max_b; ++a)
      63      for (test = 0; test < count; ++test)
      64        {
      65  	mp_size_t pn;
      66  	mp_limb_t exp;
      67  	mp_bitcnt_t res;
      68  
      69  	exp = gmp_urandomm_ui (rands, MAX_N);
      70  
      71  	pn = mpn_pow_1 (pp, &a, 1, exp, scratch);
      72  
      73  	res = mpn_sizeinbase (pp, pn, a) - 1;
      74  
      75  	if ((res < exp) || (res > exp + 1))
      76  	  {
      77  	    printf ("ERROR in test %d, base = %d, exp = %d, res = %d\n",
      78  		    test, (int) a, (int) exp, (int) res);
      79  	    abort();
      80  	  }
      81  
      82  	mpn_sub_1 (pp, pp, pn, CNST_LIMB(1));
      83  	pn -= pp[pn-1] == 0;
      84  
      85  	res = mpn_sizeinbase (pp, pn, a);
      86  
      87  	if ((res < exp) || (res - 1 > exp))
      88  	  {
      89  	    printf ("ERROR in -1 test %d, base = %d, exp = %d, res = %d\n",
      90  		    test, (int) a, (int) exp, (int) res);
      91  	    abort();
      92  	  }
      93        }
      94  
      95    TMP_FREE;
      96    tests_end ();
      97    return 0;
      98  }