common/include/test-ispowerof2.c

   1 /* nbdkit
   2  * Copyright Red Hat
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <config.h>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <stdint.h>
  38 #include <string.h>
  39 #undef NDEBUG /* Keep test strong even for nbdkit built without assertions */
  40 #include <assert.h>
  41
  42 #include "ispowerof2.h"
  43
  44 int
  45 main (void)
  46 {
  47   uint64_t i;
  48
  49   assert (! is_power_of_2 (0));
  50
  51   /* is_power_of_2 is only defined for unsigned long type, which is
  52    * 32 bit on 32 bit platforms.  We need to store i in a 64 bit type
  53    * so the loops don't wrap around.
  54    */
  55   for (i = 1; i <= 0x80000000; i <<= 1)
  56     assert (is_power_of_2 (i));
  57
  58   for (i = 4; i <= 0x80000000; i <<= 1)
  59     assert (! is_power_of_2 (i-1));
  60
  61   /* Check log_2_bits on some known values. */
  62   assert (log_2_bits (1) == 0);
  63   assert (log_2_bits (512) == 9);
  64   assert (log_2_bits (4096) == 12);
  65   assert (log_2_bits (0x80000000) == 31);
  66 #if SIZEOF_LONG == 8
  67   assert (log_2_bits (0x100000000) == 32);
  68   assert (log_2_bits (0x8000000000000000) == 63);
  69 #endif
  70
  71   exit (EXIT_SUCCESS);
  72 }