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-rw-r--r--tests/realloc.c63
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+/* realloc() function that is glibc compatible.
+
+ Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2022 Free Software
+ Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file 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 Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* written by Jim Meyering and Bruno Haible */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#include <errno.h>
+
+#include "xalloc-oversized.h"
+
+/* Call the system's realloc below. This file does not define
+ _GL_USE_STDLIB_ALLOC because it needs Gnulib's malloc if present. */
+#undef realloc
+
+/* Change the size of an allocated block of memory P to N bytes,
+ with error checking. If P is NULL, use malloc. Otherwise if N is zero,
+ free P and return NULL. */
+
+void *
+rpl_realloc (void *p, size_t n)
+{
+ if (p == NULL)
+ return malloc (n);
+
+ if (n == 0)
+ {
+ free (p);
+ return NULL;
+ }
+
+ if (xalloc_oversized (n, 1))
+ {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ void *result = realloc (p, n);
+
+#if !HAVE_MALLOC_POSIX
+ if (result == NULL)
+ errno = ENOMEM;
+#endif
+
+ return result;
+}