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diff --git a/lib/util/memrchr.c b/lib/util/memrchr.c
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+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2007, 2010-2014
+ * Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#ifndef HAVE_MEMRCHR
+
+#include <sys/types.h>
+
+#include "sudo_compat.h"
+
+/*
+ * Reverse memchr()
+ * Find the last occurrence of 'c' in the buffer 's' of size 'n'.
+ */
+void *
+sudo_memrchr(const void *s, int c, size_t n)
+{
+ const unsigned char *cp;
+
+ if (n != 0) {
+ cp = (unsigned char *)s + n;
+ do {
+ if (*(--cp) == (unsigned char)c)
+ return (void *)cp;
+ } while (--n != 0);
+ }
+ return (void *)0;
+}
+#endif /* HAVE_MEMRCHR */