[ocsp] Fix static string length calculation

Change-Id: I13d6c6f825a9340bfd54462d7d6c9cbd46008dd2

diff --git a/src/manager/service/ocsp.cpp b/src/manager/service/ocsp.cpp
index 60cdb5b..c6cb2fd 100644 (file)
--- a/src/manager/service/ocsp.cpp
+++ b/src/manager/service/ocsp.cpp
@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2014 - 2019 Samsung Electronics Co.
+ *  Copyright (c) 2014-2019 Samsung Electronics Co., Ltd. All rights reserved
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -45,10 +45,16 @@
 namespace CKM {
 
 namespace {
-const char *const HTTP_PREFIX = "http://";
-const size_t HTTP_PREFIX_LEN = sizeof(HTTP_PREFIX) / sizeof(HTTP_PREFIX[0]);
-const char *const HTTPS_PREFIX = "https://";
-const size_t HTTPS_PREFIX_LEN = sizeof(HTTPS_PREFIX) / sizeof(HTTPS_PREFIX[0]);
+template <size_t S>
+constexpr size_t staticStringLen(const char (&)[S]) {
+       static_assert(S, "static string of zero size");
+       return S-1;
+}
+
+const char HTTP_PREFIX[] = "http://";
+const size_t HTTP_PREFIX_LEN = staticStringLen(HTTP_PREFIX);
+const char HTTPS_PREFIX[] = "https://";
+const size_t HTTPS_PREFIX_LEN = staticStringLen(HTTPS_PREFIX);
 
 typedef std::unique_ptr<BIO, std::function<void(BIO *)>> BioUniquePtr;