text: // Copyright (c) 2009-2014 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #if defined(HAVE_CONFIG_H)
  #include "config/rubik-config.h"
  #endif
  
  #include <cstring>
  
  #if HAVE_DECL_STRNLEN == 0
  size_t strnlen( const char *start, size_t max_len)
  {
      const char *end = (const char *)memchr(start, '\0', max_len);
  
      return end ? (size_t)(end - start) : max_len;
  }
  #endif // HAVE_DECL_STRNLEN