system/detail/snprintf.hpp

0001 #ifndef BOOST_SYSTEM_DETAIL_SNPRINTF_HPP_INCLUDED
0002 #define BOOST_SYSTEM_DETAIL_SNPRINTF_HPP_INCLUDED
0003
0004 // Copyright 2018, 2020, 2021 Peter Dimov
0005 //
0006 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0007 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0008 //
0009 // See library home page at http://www.boost.org/libs/system
0010
0011 #include <boost/config.hpp>
0012 #include <cstdio>
0013 #include <cstdarg>
0014
0015 //
0016
0017 namespace boost
0018 {
0019
0020 namespace system
0021 {
0022
0023 namespace detail
0024 {
0025
0026 #if ( defined(_MSC_VER) && _MSC_VER < 1900 ) || ( defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR) )
0027
0028 inline void snprintf( char * buffer, std::size_t len, char const * format, ... )
0029 {
0030 # if defined( BOOST_MSVC )
0031 #  pragma warning( push )
0032 #  pragma warning( disable: 4996 )
0033 # endif
0034
0035     if( len == 0 ) return;
0036
0037     va_list args;
0038     va_start( args, format );
0039
0040     _vsnprintf( buffer, len - 1, format, args );
0041     buffer[ len - 1 ] = 0;
0042
0043     va_end( args );
0044
0045 # if defined( BOOST_MSVC )
0046 #  pragma warning( pop )
0047 # endif
0048 }
0049
0050 #else
0051
0052 #if defined(__GNUC__) && __GNUC__ >= 3
0053 __attribute__((__format__ (__printf__, 3, 4)))
0054 #endif
0055 inline void snprintf( char * buffer, std::size_t len, char const * format, ... )
0056 {
0057     va_list args;
0058     va_start( args, format );
0059
0060     std::vsnprintf( buffer, len, format, args );
0061
0062     va_end( args );
0063 }
0064
0065 #endif
0066
0067 } // namespace detail
0068
0069 } // namespace system
0070
0071 } // namespace boost
0072
0073 #endif // #ifndef BOOST_SYSTEM_DETAIL_SNPRINTF_HPP_INCLUDED