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-rw-r--r--tests/test-reallocarray.c58
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diff --git a/tests/test-reallocarray.c b/tests/test-reallocarray.c
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+/* Test of reallocarray 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 "signature.h"
+SIGNATURE_CHECK (reallocarray, void *, (void *, size_t, size_t));
+
+#include "macros.h"
+
+int
+main ()
+{
+ /* Check that reallocarray fails when requested to allocate a block
+ of memory larger than PTRDIFF_MAX or SIZE_MAX bytes. */
+ for (size_t n = 2; n != 0; n <<= 1)
+ {
+ void *volatile p = NULL;
+
+ if (PTRDIFF_MAX / n + 1 <= SIZE_MAX)
+ {
+ p = reallocarray (p, PTRDIFF_MAX / n + 1, n);
+ ASSERT (p == NULL);
+ ASSERT (errno == ENOMEM);
+ }
+
+ p = reallocarray (p, SIZE_MAX / n + 1, n);
+ ASSERT (p == NULL);
+ ASSERT (errno == ENOMEM
+ || errno == EOVERFLOW /* NetBSD */);
+
+ /* Reallocarray should not crash with zero sizes. */
+ p = reallocarray (p, 0, n);
+ p = reallocarray (p, n, 0);
+ free (p);
+ }
+
+ return 0;
+}