/*
 *          Copyright Andrey Semashev 2007 - 2013.
 * 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/libs/log/doc/log.html.
 */

#ifndef BOOST_LOG_DETAIL_SNPRINTF_HPP_INCLUDED_
#define BOOST_LOG_DETAIL_SNPRINTF_HPP_INCLUDED_

#include <cstdio>
#include <cstdarg>
#include <boost/log/detail/config.hpp>
#ifdef BOOST_LOG_USE_WCHAR_T
#include <cwchar>
#endif // BOOST_LOG_USE_WCHAR_T
#include <boost/log/detail/header.hpp>

#ifdef BOOST_LOG_HAS_PRAGMA_ONCE
#pragma once
#endif

namespace boost {

BOOST_LOG_OPEN_NAMESPACE

namespace aux {

#if !defined(_MSC_VER)

// 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

#else // !defined(_MSC_VER)

#   if _MSC_VER >= 1400

// MSVC 2005 and later provide the safe-CRT implementation of the conforming snprintf
inline int vsnprintf(char* buf, std::size_t size, const char* format, std::va_list args)
{
    return ::vsprintf_s(buf, size, format, args);
}

#       ifdef BOOST_LOG_USE_WCHAR_T
inline int vswprintf(wchar_t* buf, std::size_t size, const wchar_t* format, std::va_list args)
{
    return ::vswprintf_s(buf, size, format, args);
}
#       endif // BOOST_LOG_USE_WCHAR_T

#   else // _MSC_VER >= 1400

// MSVC prior to 2005 had a non-conforming extension _vsnprintf, that sometimes did not put a terminating '\0'
inline int vsnprintf(char* buf, std::size_t size, const char* format, std::va_list args)
{
    register int n = _vsnprintf(buf, size - 1, format, args);
    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)
{
    register int n = _vsnwprintf(buf, size - 1, format, args);
    buf[size - 1] = L'\0';
    return n;
}
#       endif // BOOST_LOG_USE_WCHAR_T

#   endif // _MSC_VER >= 1400

inline int snprintf(char* buf, std::size_t size, const char* format, ...)
{
    std::va_list args;
    va_start(args, format);
    register 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);
    register int n = vswprintf(buf, size, format, args);
    va_end(args);
    return n;
}
#   endif // BOOST_LOG_USE_WCHAR_T

#endif // !defined(_MSC_VER)

} // namespace aux

BOOST_LOG_CLOSE_NAMESPACE // namespace log

} // namespace boost

#include <boost/log/detail/footer.hpp>

#endif // BOOST_LOG_DETAIL_SNPRINTF_HPP_INCLUDED_
