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      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 }
     99