tests/test-realloc-gnu.c

   1 /* Test of realloc 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 #include <config.h>
  18
  19 /* Specification.  */
  20 #include <stdlib.h>
  21
  22 #include <errno.h>
  23 #include <stdint.h>
  24
  25 #include "macros.h"
  26
  27 int
  28 main (int argc, _GL_UNUSED char **argv)
  29 {
  30   /* Check that realloc (NULL, 0) is not a NULL pointer.  */
  31   void *volatile p = realloc (NULL, 0);
  32   ASSERT (p != NULL);
  33
  34   /* Check that realloc (p, n) fails when p is non-null and n exceeds
  35      PTRDIFF_MAX.  */
  36   if (PTRDIFF_MAX < SIZE_MAX)
  37     {
  38       size_t one = argc != 12345;
  39       p = realloc (p, PTRDIFF_MAX + one);
  40       ASSERT (p == NULL);
  41       /* Avoid a test failure due to glibc bug
  42          <https://sourceware.org/bugzilla/show_bug.cgi?id=27870>.  */
  43       if (!getenv ("MALLOC_CHECK_"))
  44         ASSERT (errno == ENOMEM);
  45     }
  46
  47   free (p);
  48   return test_exit_status;
  49 }