string/test-ffs.c

   1 /* Copyright (C) 1994 Free Software Foundation, Inc.
   2    Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
   3      On-Line Applications Research Corporation.
   4
   5 This file is part of the GNU C Library.
   6
   7 The GNU C Library is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Library General Public License as
   9 published by the Free Software Foundation; either version 2 of the
  10 License, or (at your option) any later version.
  11
  12 The GNU C Library is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 Library General Public License for more details.
  16
  17 You should have received a copy of the GNU Library General Public
  18 License along with the GNU C Library; see the file COPYING.LIB.  If
  19 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  20 Cambridge, MA 02139, USA.  */
  21
  22 #include <ansidecl.h>
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26
  27 int
  28 DEFUN(main, (argc, argv),
  29       int argc AND char **argv)
  30 {
  31   int failures = 0;
  32   int i;
  33   void try (int value, int expected)
  34     {
  35       if (ffs (value) != expected)
  36         {
  37           fprintf (stderr, "%#x expected %d got %d\n",
  38                    value, expected, ffs (value));
  39           ++failures;
  40         }
  41     }
  42
  43   try (0, 0);
  44   for (i=0 ; i<32 ; i++)
  45     try (1<<i, i+1);
  46   for (i=0 ; i<32 ; i++)
  47     try ((~0 >> i) << i, i+1);
  48   try (0x80008000, 16);
  49
  50   if (failures)
  51     printf ("Test FAILED!  %d failure%s.\n", failures, &"s"[failures == 1]);
  52   else
  53     puts ("Test succeeded.");
  54
  55   exit (failures);
  56 }