kicad/common/locale_io.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 1992-2021 KiCad Developers, see AUTHORS.txt for contributors.
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*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <locale_io.h>
#include <wx/intl.h>
#include <clocale>
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// When reading/writing files, we need to switch to setlocale( LC_NUMERIC, "C" ).
// Works fine to read/write files with floating point numbers.
// We can call setlocale( LC_NUMERIC, "C" ) or wxLocale( "C", "C", "C", false )
// wxWidgets discourage a direct call to setlocale
// However, for us, calling wxLocale( "C", "C", "C", false ) has a unwanted effect:
// The I18N translations are no longer active, because the English dictionary is selected.
// To read files, this is not a major issues, but the result can differ
// from using setlocale(xx, "C").
// Previously, we used only setlocale( LC_NUMERIC, "C" )
//
// Known issues are
// on MSW
// using setlocale( LC_NUMERIC, "C" ) generates an alert message in debug mode,
// and this message ("Decimal separator mismatch") must be disabled.
// But calling wxLocale( "C", "C", "C", false ) works fine
// On unix:
// calling wxLocale( "C", "C", "C", false ) breaks env vars containing non ASCII7 chars.
// these env vars return a empty string from wxGetEnv() in many cases, and if such a
// var must be read after calling wxLocale( "C", "C", "C", false ), it looks like empty
//
// So use wxLocale on Windows and setlocale on unix
// set USE_WXLOCALE 0 to use setlocale, 1 to use wxLocale:
#if defined( _WIN32 )
#define USE_WXLOCALE 1
#else
#define USE_WXLOCALE 0
#endif
// On Windows, when using setlocale, a wx alert is generated
// in some cases (reading a bitmap for instance)
// So we disable alerts during the time a file is read or written
#if !USE_WXLOCALE
#if defined( _WIN32 ) && defined( DEBUG )
// a wxAssertHandler_t function to filter wxWidgets alert messages when reading/writing a file
// when switching the locale to LC_NUMERIC, "C"
// It is used in class LOCALE_IO to hide a useless (in kicad) wxWidgets alert message
void KiAssertFilter( const wxString &file, int line,
const wxString &func, const wxString &cond,
const wxString &msg)
{
if( !msg.Contains( "Decimal separator mismatch" ) )
wxTheApp->OnAssertFailure( file.c_str(), line, func.c_str(), cond.c_str(), msg.c_str() );
}
#endif
#endif
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std::atomic<unsigned int> LOCALE_IO::m_c_count( 0 );
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LOCALE_IO::LOCALE_IO() : m_wxLocale( nullptr )
{
// use thread safe, atomic operation
if( m_c_count++ == 0 )
{
#if USE_WXLOCALE
#define C_LANG "C"
m_wxLocale = new wxLocale( C_LANG, C_LANG, C_LANG, false );
#else
// Store the user locale name, to restore this locale later, in dtor
m_user_locale = setlocale( LC_NUMERIC, nullptr );
#if defined( _WIN32 ) && defined( DEBUG )
// Disable wxWidgets alerts
wxSetAssertHandler( KiAssertFilter );
#endif
// Switch the locale to C locale, to read/write files with fp numbers
setlocale( LC_NUMERIC, "C" );
#endif
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}
}
LOCALE_IO::~LOCALE_IO()
{
// use thread safe, atomic operation
if( --m_c_count == 0 )
{
// revert to the user locale
#if USE_WXLOCALE
delete m_wxLocale; // Deleting m_wxLocale restored previous locale
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m_wxLocale = nullptr;
#else
setlocale( LC_NUMERIC, m_user_locale.c_str() );
#if defined( _WIN32 ) && defined( DEBUG )
// Enable wxWidgets alerts
wxSetDefaultAssertHandler();
#endif
#endif
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}
}