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+/* Test of realloc function.
+ Copyright (C) 2010-2022 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include <stdlib.h>
+
+#include <errno.h>
+#include <stdint.h>
+
+#include "macros.h"
+
+int
+main (int argc, char **argv)
+{
+ /* Check that realloc (NULL, 0) is not a NULL pointer. */
+ void *volatile p = realloc (NULL, 0);
+ ASSERT (p != NULL);
+
+ /* Check that realloc (p, n) fails when p is non-null and n exceeds
+ PTRDIFF_MAX. */
+ if (PTRDIFF_MAX < SIZE_MAX)
+ {
+ size_t one = argc != 12345;
+ p = realloc (p, PTRDIFF_MAX + one);
+ ASSERT (p == NULL);
+ /* Avoid a test failure due to glibc bug
+ <https://sourceware.org/bugzilla/show_bug.cgi?id=27870>. */
+ if (!getenv ("MALLOC_CHECK_"))
+ ASSERT (errno == ENOMEM);
+ }
+
+ free (p);
+ return 0;
+}