ceph/src/boost/libs/log/src/id_formatting.hpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   id_formatting.hpp
   9  * \author Andrey Semashev
  10  * \date   25.01.2015
  11  *
  12  * \brief  This header is the Boost.Log library implementation, see the library documentation
  13  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
  14  */
  15
  16 #ifndef BOOST_LOG_ID_FORMATTING_HPP_INCLUDED_
  17 #define BOOST_LOG_ID_FORMATTING_HPP_INCLUDED_
  18
  19 #include <boost/log/detail/config.hpp>
  20 #include <cstddef>
  21 #include <boost/log/detail/header.hpp>
  22
  23 namespace boost {
  24
  25 BOOST_LOG_OPEN_NAMESPACE
  26
  27 namespace aux {
  28
  29 // Defined in dump.cpp
  30 extern const char g_hex_char_table[2][16];
  31
  32 template< std::size_t IdSize, typename CharT, typename IdT >
  33 inline void format_id(CharT* buf, std::size_t size, IdT id, bool uppercase) BOOST_NOEXCEPT
  34 {
  35     const char* const char_table = g_hex_char_table[uppercase];
  36
  37     // Input buffer is assumed to be always larger than 2 chars
  38     *buf++ = static_cast< CharT >(char_table[0]);  // '0'
  39     *buf++ = static_cast< CharT >(char_table[10] + ('x' - 'a')); // 'x'
  40
  41     size -= 3; // reserve space for the terminating 0
  42     std::size_t i = 0;
  43     const std::size_t n = (size > (IdSize * 2u)) ? IdSize * 2u : size;
  44     for (std::size_t shift = n * 4u - 4u; i < n; ++i, shift -= 4u)
  45     {
  46         buf[i] = static_cast< CharT >(char_table[(id >> shift) & 15u]);
  47     }
  48
  49     buf[i] = static_cast< CharT >('\0');
  50 }
  51
  52 } // namespace aux
  53
  54 BOOST_LOG_CLOSE_NAMESPACE // namespace log
  55
  56 } // namespace boost
  57
  58 #include <boost/log/detail/footer.hpp>
  59
  60 #endif // BOOST_LOG_ID_FORMATTING_HPP_INCLUDED_
  61