tests/test-byteswap.c

   1 /* Test of <byteswap.h> substitute.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <byteswap.h>
  22 #include <stdint.h>
  23
  24 #include "macros.h"
  25
  26 /* Test bswap functions with constant values.  */
  27 static void
  28 test_bswap_constant (void)
  29 {
  30   ASSERT (bswap_16 (UINT16_C (0x1234)) == UINT16_C (0x3412));
  31   ASSERT (bswap_32 (UINT32_C (0x12345678)) == UINT32_C (0x78563412));
  32 #ifdef UINT_LEAST64_MAX
  33   ASSERT (bswap_64 (UINT64_C (0x1234567890ABCDEF))
  34           == UINT64_C (0xEFCDAB9078563412));
  35 #endif
  36 }
  37
  38 /* Test that the bswap functions evaluate their arguments once.  */
  39 static void
  40 test_bswap_eval_once (void)
  41 {
  42   uint_least16_t value_1 = 0;
  43   ASSERT (bswap_16 (value_1++) == 0);
  44   ASSERT (value_1 == 1);
  45
  46   uint_least32_t value_2 = 0;
  47   ASSERT (bswap_32 (value_2++) == 0);
  48   ASSERT (value_2 == 1);
  49
  50 #ifdef UINT_LEAST64_MAX
  51   uint_least64_t value_3 = 0;
  52   ASSERT (bswap_64 (value_3++) == 0);
  53   ASSERT (value_3 == 1);
  54 #endif
  55 }
  56
  57 /* Test that the bswap functions accept floating-point arguments.  */
  58 static void
  59 test_bswap_double (void)
  60 {
  61   ASSERT (bswap_16 (0.0) == 0);
  62   ASSERT (bswap_32 (0.0) == 0);
  63 #ifdef UINT_LEAST64_MAX
  64   ASSERT (bswap_64 (0.0) == 0);
  65 #endif
  66 }
  67
  68 int
  69 main (void)
  70 {
  71   test_bswap_constant ();
  72   test_bswap_eval_once ();
  73   test_bswap_double ();
  74
  75   return test_exit_status;
  76 }