string/tst-bswap.c

   1 /* Copyright (C) 2000-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <byteswap.h>
  19 #include <stdio.h>
  20
  21 extern unsigned long long int wash (unsigned long long int a);
  22
  23 int
  24 do_test (void)
  25 {
  26   int result = 0;
  27
  28   /* Test the functions with constant arguments.  */
  29   if (bswap_16 (0x1234) != 0x3412)
  30     {
  31       puts ("bswap_16 (constant) flunked");
  32       result = 1;
  33     }
  34   if (bswap_32 (0x12345678) != 0x78563412)
  35     {
  36       puts ("bswap_32 (constant) flunked");
  37       result = 1;
  38     }
  39   if (bswap_64 (0x1234567890abcdefULL) != 0xefcdab9078563412ULL)
  40     {
  41       puts ("bswap_64 (constant) flunked");
  42       result = 1;
  43     }
  44
  45   /* Test the functions with non-constant arguments.  */
  46   if (bswap_16 (wash (0x1234)) != 0x3412)
  47     {
  48       puts ("bswap_16 (non-constant) flunked");
  49       result = 1;
  50     }
  51   if (bswap_32 (wash (0x12345678)) != 0x78563412)
  52     {
  53       puts ("bswap_32 (non-constant) flunked");
  54       result = 1;
  55     }
  56   if (bswap_64 (wash (0x1234567890abcdefULL)) != 0xefcdab9078563412ULL)
  57     {
  58       puts ("bswap_64 (non-constant) flunked");
  59       result = 1;
  60     }
  61
  62   return result;
  63 }
  64
  65
  66 unsigned long long int
  67 wash (unsigned long long int a)
  68 {
  69   /* Do nothing.  This function simply exists to avoid that the compiler
  70      regards the argument to the bswap_*() functions as constant.  */
  71   return a + 0;
  72 }
  73
  74 #include <support/test-driver.c>