vendor/bind9/9.8.7vendor/bind9-9.8

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/isc/safe.c b/lib/isc/safe.c
new file mode 100644
index 0000000000000..fd27687188722
--- /dev/null
+++ b/lib/isc/safe.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2013  Internet Systems Consortium, Inc. ("ISC")
+ *
+ * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS.  IN NO EVENT SHALL ISC 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.
+ */
+
+/* $Id$ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <isc/safe.h>
+#include <isc/util.h>
+
+#ifdef _MSC_VER
+#pragma optimize("", off)
+#endif
+
+isc_boolean_t
+isc_safe_memcmp(const void *s1, const void *s2, size_t n) {
+	isc_uint8_t acc = 0;
+
+	if (n != 0U) {
+		const isc_uint8_t *p1 = s1, *p2 = s2;
+
+		do {
+			acc |= *p1++ ^ *p2++;
+		} while (--n != 0U);
+	}
+	return (ISC_TF(acc == 0));
+}