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

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• Hash : 1602f0af
  Author :
  Date : 2012-01-01T10:04:58
  

  maint: update all copyright year number ranges
  
  Run "make update-copyright".
  

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• tests/test-ffsl.c

• /*
   * Copyright (C) 2011-2012 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 <http://www.gnu.org/licenses/>.  */
  
  /* Written by Eric Blake.  */
  #include <config.h>
  
  #include <string.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (ffsl, int, (long int));
  
  #include <limits.h>
  
  #include "macros.h"
  
  #define NBITS (sizeof (long int) * CHAR_BIT)
  
  static int
  naive (long int i)
  {
    unsigned long int j;
    for (j = 0; j < NBITS; j++)
      if (i & (1UL << j))
        return j + 1;
    return 0;
  }
  
  int
  main (int argc, char *argv[])
  {
    long int x;
    int i;
  
    for (i = -128; i <= 128; i++)
      ASSERT (ffsl (i) == naive (i));
    for (i = 0; i < NBITS; i++)
      {
        ASSERT (ffsl (1UL << i) == naive (1UL << i));
        ASSERT (ffsl (1UL << i) == i + 1);
        ASSERT (ffsl (-1UL << i) == i + 1);
      }
    for (i = 0; i < NBITS - 1; i++)
      {
        ASSERT (ffsl (3UL << i) == i + 1);
        ASSERT (ffsl (-3UL << i) == i + 1);
      }
    for (i = 0; i < NBITS - 2; i++)
      {
        ASSERT (ffsl (5UL << i) == i + 1);
        ASSERT (ffsl (-5UL << i) == i + 1);
        ASSERT (ffsl (7UL << i) == i + 1);
        ASSERT (ffsl (-7UL << i) == i + 1);
      }
    return 0;
  }
  

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