ceph/src/boost/libs/log/include/boost/log/detail/snprintf.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   snprintf.hpp
   9  * \author Andrey Semashev
  10  * \date   20.02.2009
  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_DETAIL_SNPRINTF_HPP_INCLUDED_
  17 #define BOOST_LOG_DETAIL_SNPRINTF_HPP_INCLUDED_
  18
  19 #include <stdio.h>
  20 #include <cstddef>
  21 #include <cstdarg>
  22 #include <boost/log/detail/config.hpp>
  23 #ifdef BOOST_LOG_USE_WCHAR_T
  24 #include <wchar.h>
  25 #endif // BOOST_LOG_USE_WCHAR_T
  26 #include <boost/log/detail/header.hpp>
  27
  28 #ifdef BOOST_HAS_PRAGMA_ONCE
  29 #pragma once
  30 #endif
  31
  32 namespace boost {
  33
  34 BOOST_LOG_OPEN_NAMESPACE
  35
  36 namespace aux {
  37
  38 #if defined(_MSC_VER) || (defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR))
  39
  40 // MSVC snprintfs are not conforming but they are good enough for our cases.
  41 // MinGW32, at least the older versions up until gcc 4.7, also provide the non-conforming interface.
  42 inline int vsnprintf(char* buf, std::size_t size, const char* format, std::va_list args)
  43 {
  44     int n = _vsnprintf(buf, size, format, args);
  45     if (static_cast< unsigned int >(n) >= size)
  46     {
  47         n = static_cast< int >(size);
  48         buf[size - 1] = '\0';
  49     }
  50     return n;
  51 }
  52
  53 #   ifdef BOOST_LOG_USE_WCHAR_T
  54 inline int vswprintf(wchar_t* buf, std::size_t size, const wchar_t* format, std::va_list args)
  55 {
  56     int n = _vsnwprintf(buf, size, format, args);
  57     if (static_cast< unsigned int >(n) >= size)
  58     {
  59         n = static_cast< int >(size);
  60         buf[size - 1] = L'\0';
  61     }
  62     return n;
  63 }
  64 #   endif // BOOST_LOG_USE_WCHAR_T
  65
  66 inline int snprintf(char* buf, std::size_t size, const char* format, ...)
  67 {
  68     std::va_list args;
  69     va_start(args, format);
  70     int n = vsnprintf(buf, size, format, args);
  71     va_end(args);
  72     return n;
  73 }
  74
  75 #   ifdef BOOST_LOG_USE_WCHAR_T
  76 inline int swprintf(wchar_t* buf, std::size_t size, const wchar_t* format, ...)
  77 {
  78     std::va_list args;
  79     va_start(args, format);
  80     int n = vswprintf(buf, size, format, args);
  81     va_end(args);
  82     return n;
  83 }
  84 #   endif // BOOST_LOG_USE_WCHAR_T
  85
  86 #else
  87
  88 // Standard-conforming compilers already have the correct snprintfs
  89 using ::snprintf;
  90 using ::vsnprintf;
  91
  92 #   ifdef BOOST_LOG_USE_WCHAR_T
  93 using ::swprintf;
  94 using ::vswprintf;
  95 #   endif // BOOST_LOG_USE_WCHAR_T
  96
  97 #endif
  98
  99 } // namespace aux
 100
 101 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 102
 103 } // namespace boost
 104
 105 #include <boost/log/detail/footer.hpp>
 106
 107 #endif // BOOST_LOG_DETAIL_SNPRINTF_HPP_INCLUDED_