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Add detail/snprintf.hpp

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This commit is contained in:
Peter Dimov
2021-06-13 18:58:50 +03:00
parent a0136e570d
commit 20b8e90dff
6 changed files with 139 additions and 25 deletions
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4
include/boost/system/detail/error_category_impl.hpp
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@ -13,6 +13,7 @@
#include <boost/system/detail/error_category.hpp>
#include <boost/system/detail/error_condition.hpp>
#include <boost/system/detail/error_code.hpp>
#include <boost/system/detail/snprintf.hpp>
#include <boost/config.hpp>
#include <string>
#include <cstring>
@ -83,7 +84,8 @@ inline char const * error_category::message( int ev, char * buffer, std::size_t
#if !defined(BOOST_NO_EXCEPTIONS)
catch( ... )
{
return "Message text unavailable";
detail::snprintf( buffer, len, "No message text available for error %d", ev );
return buffer;
}
#endif
}

70
include/boost/system/detail/snprintf.hpp Normal file
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@ -0,0 +1,70 @@
#ifndef BOOST_SYSTEM_DETAIL_SNPRINTF_HPP_INCLUDED
#define BOOST_SYSTEM_DETAIL_SNPRINTF_HPP_INCLUDED
// Copyright 2018, 2020, 2021 Peter Dimov
//
// 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)
//
// See library home page at http://www.boost.org/libs/system
#include <boost/config.hpp>
#include <cstdio>
#include <cstdarg>
//
namespace boost
{
namespace system
{
namespace detail
{
#if ( defined(_MSC_VER) && _MSC_VER < 1900 ) || ( defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR) )
inline void snprintf( char * buffer, std::size_t len, char const * format, ... )
{
# if defined( BOOST_MSVC )
# pragma warning( push )
# pragma warning( disable: 4996 )
# endif
if( len == 0 ) return;
va_list args;
va_start( args, format );
_vsnprintf( buffer, len - 1, format, args );
buffer[ len - 1 ] = 0;
va_end( args );
# if defined( BOOST_MSVC )
# pragma warning( pop )
# endif
}
#else
inline void snprintf( char * buffer, std::size_t len, char const * format, ... )
{
va_list args;
va_start( args, format );
std::vsnprintf( buffer, len, format, args );
va_end( args );
}
#endif
} // namespace detail
} // namespace system
} // namespace boost
#endif // #ifndef BOOST_SYSTEM_DETAIL_SNPRINTF_HPP_INCLUDED

26
include/boost/system/detail/system_category_message_win32.hpp
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@ -10,6 +10,7 @@
//
// See library home page at http://www.boost.org/libs/system
#include <boost/system/detail/snprintf.hpp>
#include <boost/winapi/error_handling.hpp>
#include <boost/winapi/character_code_conversion.hpp>
#include <boost/winapi/local_memory.hpp>
@ -27,35 +28,12 @@ namespace system
namespace detail
{
#if ( defined(_MSC_VER) && _MSC_VER < 1900 ) || ( defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR) )
inline char const * unknown_message_win32( int ev, char * buffer, std::size_t len )
{
# if defined( BOOST_MSVC )
# pragma warning( push )
# pragma warning( disable: 4996 )
# endif
_snprintf( buffer, len - 1, "Unknown error (%d)", ev );
buffer[ len - 1 ] = 0;
return buffer;
# if defined( BOOST_MSVC )
# pragma warning( pop )
# endif
}
#else
inline char const * unknown_message_win32( int ev, char * buffer, std::size_t len )
{
std::snprintf( buffer, len, "Unknown error (%d)", ev );
detail::snprintf( buffer, len, "Unknown error (%d)", ev );
return buffer;
}
#endif
inline boost::winapi::UINT_ message_cp_win32()
{
#if defined(BOOST_SYSTEM_USE_UTF8)

2
test/CMakeLists.txt
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@ -87,3 +87,5 @@ boost_test(TYPE run SOURCES cygwin_error_test.cpp)
boost_test(TYPE run SOURCES linux_error_test.cpp)
boost_test(TYPE link SOURCES errc_test3.cpp)
boost_test(TYPE run SOURCES snprintf_test.cpp)

2
test/Jamfile.v2
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@ -91,3 +91,5 @@ run cygwin_error_test.cpp ;
run linux_error_test.cpp ;
link errc_test3.cpp ;
run snprintf_test.cpp ;

60
test/snprintf_test.cpp Normal file
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@ -0,0 +1,60 @@
// Copyright 2021 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/system/detail/snprintf.hpp>
#include <boost/core/lightweight_test.hpp>
int main()
{
{
char buffer[ 64 ];
boost::system::detail::snprintf( buffer, sizeof(buffer), "...%s...%d...", "xy", 151 );
BOOST_TEST_CSTR_EQ( buffer, "...xy...151..." );
}
{
char buffer[ 64 ];
boost::system::detail::snprintf( buffer, sizeof(buffer), "...%s...%d...", "xy", 151 );
BOOST_TEST_CSTR_EQ( buffer, "...xy...151..." );
}
{
char buffer[ 15 ];
boost::system::detail::snprintf( buffer, sizeof(buffer), "...%s...%d...", "xy", 151 );
BOOST_TEST_CSTR_EQ( buffer, "...xy...151..." );
}
{
char buffer[ 14 ];
boost::system::detail::snprintf( buffer, sizeof(buffer), "...%s...%d...", "xy", 151 );
BOOST_TEST_CSTR_EQ( buffer, "...xy...151.." );
}
{
char buffer[ 5 ];
boost::system::detail::snprintf( buffer, sizeof(buffer), "...%s...%d...", "xy", 151 );
BOOST_TEST_CSTR_EQ( buffer, "...x" );
}
{
char buffer[ 1 ];
boost::system::detail::snprintf( buffer, sizeof(buffer), "...%s...%d...", "xy", 151 );
BOOST_TEST_CSTR_EQ( buffer, "" );
}
{
char buffer[ 1 ] = { 'Q' };
boost::system::detail::snprintf( buffer, 0, "...%s...%d...", "xy", 151 );
BOOST_TEST_EQ( buffer[0], 'Q' );
}
return boost::report_errors();
}