string/test-ffs.c

   1 /* Copyright (C) 1994-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
   4      On-Line Applications Research Corporation.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 int
  25 main (void)
  26 {
  27   int failures = 0;
  28   int i;
  29
  30   auto void try (const char *name, long long int param, int value,
  31                  int expected);
  32
  33   void try (const char *name, long long int param, int value, int expected)
  34     {
  35       if (value != expected)
  36         {
  37           printf ("%s(%#llx) expected %d got %d\n",
  38                   name, param, expected, value);
  39           ++failures;
  40         }
  41       else
  42         printf ("%s(%#llx) as expected %d\n", name, param, value);
  43     }
  44
  45 #define TEST(fct, type) \
  46   try (#fct, 0, fct ((type) 0), 0);                                           \
  47   for (i=0 ; i < 8 * sizeof (type); i++)                                      \
  48     try (#fct, 1ll << i, fct (((type) 1) << i), i + 1);                       \
  49   for (i=0 ; i < 8 * sizeof (type) ; i++)                                     \
  50     try (#fct, (~((type) 0) >> i) << i, fct ((~((type) 0) >> i) << i), i + 1);\
  51   try (#fct, 0x80008000, fct ((type) 0x80008000), 16)
  52
  53   TEST (ffs, int);
  54   TEST (ffsl, long int);
  55   TEST (ffsll, long long int);
  56
  57   if (failures)
  58     printf ("Test FAILED!  %d failure%s.\n", failures, &"s"[failures == 1]);
  59   else
  60     puts ("Test succeeded.");
  61
  62   return failures;
  63 }