tests/test-malloc-gnu.c

   1 /* Test of malloc function.
   2    Copyright (C) 2010-2025 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 /* Work around clang bug
  28    <https://github.com/llvm/llvm-project/issues/114772>.  */
  29 void *(*volatile my_malloc) (size_t) = malloc;
  30 #undef malloc
  31 #define malloc my_malloc
  32
  33 int
  34 main (int argc, _GL_UNUSED char **argv)
  35 {
  36   /* Check that malloc (0) is not a NULL pointer.  */
  37   void *p = malloc (0);
  38   ASSERT (p != NULL);
  39   free (p);
  40
  41   /* Check that malloc (n) fails when n exceeds PTRDIFF_MAX.  */
  42   if (PTRDIFF_MAX < SIZE_MAX)
  43     {
  44       size_t one = argc != 12345;
  45       p = malloc (PTRDIFF_MAX + one);
  46       ASSERT (p == NULL);
  47       ASSERT (errno == ENOMEM);
  48     }
  49
  50   return test_exit_status;
  51 }