63e88f80
 Hu Chunming
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/*
* Copyright Andrey Semashev 2007 - 2015.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
/*!
* \file snprintf.hpp
* \author Andrey Semashev
* \date 20.02.2009
*
* \brief This header is the Boost.Log library implementation, see the library documentation
* at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
*/
#ifndef BOOST_LOG_DETAIL_SNPRINTF_HPP_INCLUDED_
#define BOOST_LOG_DETAIL_SNPRINTF_HPP_INCLUDED_
#include <stdio.h>
#include <cstddef>
#include <cstdarg>
#include <boost/log/detail/config.hpp>
#ifdef BOOST_LOG_USE_WCHAR_T
#include <wchar.h>
#endif // BOOST_LOG_USE_WCHAR_T
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace aux {
#if defined(_MSC_VER) || (defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR))
// MSVC snprintfs are not conforming but they are good enough for our cases.
// MinGW32, at least the older versions up until gcc 4.7, also provide the non-conforming interface.
inline int vsnprintf(char* buf, std::size_t size, const char* format, std::va_list args)
{
int n = _vsnprintf(buf, size, format, args);
if (static_cast< unsigned int >(n) >= size)
{
n = static_cast< int >(size);
buf[size - 1] = '\0';
}
return n;
}
# ifdef BOOST_LOG_USE_WCHAR_T
inline int vswprintf(wchar_t* buf, std::size_t size, const wchar_t* format, std::va_list args)
{
int n = _vsnwprintf(buf, size, format, args);
if (static_cast< unsigned int >(n) >= size)
{
n = static_cast< int >(size);
buf[size - 1] = L'\0';
}
return n;
}
# endif // BOOST_LOG_USE_WCHAR_T
inline int snprintf(char* buf, std::size_t size, const char* format, ...)
{
std::va_list args;
va_start(args, format);
int n = vsnprintf(buf, size, format, args);
va_end(args);
return n;
}
# ifdef BOOST_LOG_USE_WCHAR_T
inline int swprintf(wchar_t* buf, std::size_t size, const wchar_t* format, ...)
{
std::va_list args;
va_start(args, format);
int n = vswprintf(buf, size, format, args);
va_end(args);
return n;
}
# endif // BOOST_LOG_USE_WCHAR_T
#else
// Standard-conforming compilers already have the correct snprintfs
using ::snprintf;
using ::vsnprintf;
# ifdef BOOST_LOG_USE_WCHAR_T
using ::swprintf;
using ::vswprintf;
# endif // BOOST_LOG_USE_WCHAR_T
#endif
} // namespace aux
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_DETAIL_SNPRINTF_HPP_INCLUDED_
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