/*
 * Copyright (C) 2007-2008 Free Software Foundation
 *
 * 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 <http://www.gnu.org/licenses/>.  */

/* Written by Ben Pfaff.  */

#include <config.h>

#include "count-one-bits.h"

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>

#define ASSERT(expr)                                            \
  do                                                            \
    {                                                           \
      if (!(expr))                                              \
        {                                                       \
          fprintf (stderr, "%s:%d: assertion \"%s\" failed\n",  \
                   __FILE__, __LINE__, #expr);                  \
          fflush (stderr);                                      \
          abort ();                                             \
        }                                                       \
    }                                                           \
  while (0)

#define UINT_BIT (sizeof (unsigned int) * CHAR_BIT)
#define ULONG_BIT (sizeof (unsigned long int) * CHAR_BIT)
#define ULLONG_BIT (sizeof (unsigned long long int) * CHAR_BIT)

#ifndef ULLONG_MAX
# define HALF (1ULL << (sizeof (unsigned long long int) * CHAR_BIT - 1))
# define ULLONG_MAX (HALF - 1 + HALF)
#endif

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

#define TEST_COUNT_ONE_BITS(FUNC, TYPE, BITS, MAX, ONE) \
  ASSERT (FUNC (0) == 0);                               \
  for (i = 0; i < BITS; i++)                            \
    {                                                   \
      ASSERT (FUNC (ONE << i) == 1);                    \
      for (j = i + 1; j < BITS; j++)                    \
        ASSERT (FUNC ((ONE << i) | (ONE << j)) == 2);   \
    }                                                   \
  for (i = 0; i < 1000; i++)                            \
    {                                                   \
      TYPE value = rand () ^ (rand () << 31 << 1);      \
      int count = 0;                                    \
      for (j = 0; j < BITS; j++)                        \
        count += (value & (ONE << j)) != 0;             \
      ASSERT (count == FUNC (value));                   \
    }                                                   \
  ASSERT (FUNC (MAX) == BITS);

  TEST_COUNT_ONE_BITS (count_one_bits, unsigned int, UINT_BIT, UINT_MAX, 1U);
  TEST_COUNT_ONE_BITS (count_one_bits_l, unsigned long int,
                       ULONG_BIT, ULONG_MAX, 1UL);
#ifdef HAVE_UNSIGNED_LONG_LONG_INT
  TEST_COUNT_ONE_BITS (count_one_bits_ll,
                       unsigned long long int, ULLONG_BIT, ULLONG_MAX, 1ULL);
#endif

  return 0;
}