tests/test-reallocarray.c

   1 /* Test of reallocarray 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 "signature.h"
  26 SIGNATURE_CHECK (reallocarray, void *, (void *, size_t, size_t));
  27
  28 #include "macros.h"
  29
  30 int
  31 main ()
  32 {
  33   /* Check that reallocarray fails when requested to allocate a block
  34      of memory larger than PTRDIFF_MAX or SIZE_MAX bytes.  */
  35   for (size_t n = 2; n != 0; n <<= 1)
  36     {
  37       void *volatile p = NULL;
  38
  39       if (PTRDIFF_MAX / n + 1 <= SIZE_MAX)
  40         {
  41           p = reallocarray (p, PTRDIFF_MAX / n + 1, n);
  42           ASSERT (p == NULL);
  43           ASSERT (errno == ENOMEM);
  44         }
  45
  46       p = reallocarray (p, SIZE_MAX / n + 1, n);
  47       ASSERT (p == NULL);
  48       ASSERT (errno == ENOMEM
  49               || errno == EOVERFLOW /* NetBSD */);
  50
  51       /* Reallocarray should not crash with zero sizes.  */
  52       p = reallocarray (p, 0, n);
  53       p = reallocarray (p, n, 0);
  54       free (p);
  55     }
  56
  57   return test_exit_status;
  58 }