string/tst-bswap.c

   1 /* Copyright (C) 2000-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <byteswap.h>
  20 #include <stdio.h>
  21
  22 extern unsigned long long int wash (unsigned long long int a);
  23
  24 int
  25 do_test (void)
  26 {
  27   int result = 0;
  28
  29   /* Test the functions with constant arguments.  */
  30   if (bswap_16 (0x1234) != 0x3412)
  31     {
  32       puts ("bswap_16 (constant) flunked");
  33       result = 1;
  34     }
  35   if (bswap_32 (0x12345678) != 0x78563412)
  36     {
  37       puts ("bswap_32 (constant) flunked");
  38       result = 1;
  39     }
  40   if (bswap_64 (0x1234567890abcdefULL) != 0xefcdab9078563412ULL)
  41     {
  42       puts ("bswap_64 (constant) flunked");
  43       result = 1;
  44     }
  45
  46   /* Test the functions with non-constant arguments.  */
  47   if (bswap_16 (wash (0x1234)) != 0x3412)
  48     {
  49       puts ("bswap_16 (non-constant) flunked");
  50       result = 1;
  51     }
  52   if (bswap_32 (wash (0x12345678)) != 0x78563412)
  53     {
  54       puts ("bswap_32 (non-constant) flunked");
  55       result = 1;
  56     }
  57   if (bswap_64 (wash (0x1234567890abcdefULL)) != 0xefcdab9078563412ULL)
  58     {
  59       puts ("bswap_64 (non-constant) flunked");
  60       result = 1;
  61     }
  62
  63   return result;
  64 }
  65
  66
  67 unsigned long long int
  68 wash (unsigned long long int a)
  69 {
  70   /* Do nothing.  This function simply exists to avoid that the compiler
  71      regards the argument to the bswap_*() functions as constant.  */
  72   return a + 0;
  73 }
  74
  75 #include <support/test-driver.c>