tests/test-wcsncat.c

   1 /* Test of wcsncat() function.
   2    Copyright (C) 2010-2024 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>, 2024.  */
  18
  19 #include <config.h>
  20
  21 /* Specification.  */
  22 #include <wchar.h>
  23
  24 #include <stddef.h>
  25
  26 #include "macros.h"
  27
  28 /* Test the library, not the compiler+library.  */
  29 static wchar_t *
  30 lib_wcsncat (wchar_t *ws1, wchar_t const *ws2, size_t n)
  31 {
  32   return wcsncat (ws1, ws2, n);
  33 }
  34 static wchar_t *(*volatile volatile_wcsncat) (wchar_t *, wchar_t const *,
  35                                               size_t)
  36   = lib_wcsncat;
  37 #undef wcsncat
  38 #define wcsncat volatile_wcsncat
  39
  40 int
  41 main ()
  42 {
  43   /* Test zero-length operations on NULL pointers, allowed by
  44      <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3322.pdf>.  */
  45
  46 #if 0 /* I think this is invalid, per ISO C 23 § 7.31.4.3.2.  */
  47   ASSERT (wcsncat (NULL, L"x", 0) == NULL);
  48 #endif
  49
  50   {
  51     wchar_t y[2] = { L'x', 0 };
  52     ASSERT (wcsncat (y, NULL, 0) == y);
  53   }
  54
  55   return test_exit_status;
  56 }