Merge pull request #234 from google/FF0F89A9FFB90668CB5E5C968FD01756

(AUTOMATIC) opensource update

Author: battre

cpp/src/validating_util.cc

@@ -84,8 +84,8 @@ bool UnwrapHeader(const char* header_prefix,
 void ValidatingUtil::Wrap(time_t timestamp, std::string* data) {
   assert(data != nullptr);
   char timestamp_string[2 + 3 * sizeof timestamp];
-  int size =
-      std::sprintf(timestamp_string, "%ld", static_cast<long>(timestamp));
+  int size = std::snprintf(timestamp_string, sizeof(timestamp_string), "%ld",
+                           static_cast<long>(timestamp));
   assert(size > 0);
   assert(size < sizeof timestamp_string);
   (void)size;