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// Copyright (c) 2016, Novartis Institutes for BioMedical Research Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Novartis Institutes for BioMedical Research Inc.
// nor the names of its contributors may be used to endorse or promote
// products derived from this software without specific prior written
// permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
#if defined(__CYGWIN__) && !defined(_GNU_SOURCE)
// -std=c++11 turns off recent POSIX features!
#define _GNU_SOURCE
#endif
#include "LocaleSwitcher.h"
#include <string>
// LocaleSwitcher Dependencies
#include <clocale>
#ifdef __APPLE__
#include <xlocale.h>
#endif
#ifdef __CYGWIN__
#include <locale.h>
#endif
#ifdef RDK_THREADSAFE_SSS
#include <thread>
#endif
namespace RDKit {
namespace Utils {
namespace detail {
// Implementation of LocaleSwitcher
// The locale switcher has state to indicate how many times
// it has been used (in a thread if thread safe RDKIT)
const static int CurrentState = 0; // return current state
const static int SwitchLocale = 1; // indicate we are now switched to "C"
const static int ResetLocale = -1; // return to previous locale (not "C")
// Returns how many LocaleSwitches we have gone down.
// Such as
// void foo() { LocaleSwitcher switch; }
// void bar() { LocaleSwitcher switch; foo(); }
//
// Implementations are free to not switch the locale if the locale
// is already in "C", but this is implementation defined.
// When Recurse(CurrentState) == 0 we are in the "global" locale,
// or at least at the top locale that isn't "C".
//
static int recurseLocale(int state) {
#ifndef RDK_THREADSAFE_SSS
static int recursion = 0;
if (state == SwitchLocale)
recursion++;
else if (state == ResetLocale)
recursion--;
return recursion;
#else
static thread_local int recursion = 0;
if (state == SwitchLocale)
recursion++;
else if (state == ResetLocale)
recursion--;
return recursion;
#endif
}
// allows an RAII-like approach to ensuring the locale is temporarily "C"
// instead of whatever we started in.
class LocaleSwitcherImpl {
public:
#ifdef _WIN32
LocaleSwitcherImpl() {
if (!recurseLocale(CurrentState)) {
#ifdef RDK_THREADSAFE_SSS
_configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
old_locale = ::setlocale(LC_ALL, nullptr);
::setlocale(LC_ALL, "C"); // thread safe on windows
#else
std::setlocale(LC_ALL, "C");
#endif // RDK_THREADSAFE_SSS
recurseLocale(SwitchLocale);
switched = true;
}
}
~LocaleSwitcherImpl() {
if (switched) {
#ifdef RDK_THREADSAFE_SSS
::setlocale(LC_ALL, old_locale.c_str());
#else
std::setlocale(LC_ALL, old_locale.c_str()); // back to last (global?) locale
#endif // RDK_THREADSAFE_SSS
recurseLocale(ResetLocale);
}
}
public:
bool switched = false;
std::string old_locale;
#else // _WIN32
locale_t loc; // current "C" locale
locale_t old_loc; // locale we came frome
LocaleSwitcherImpl() : old_locale(setlocale(LC_ALL, nullptr)) {
// set locale for this thread
if (!recurseLocale(CurrentState) && old_locale != "C") {
recurseLocale(SwitchLocale);
old_loc = uselocale(nullptr);
loc = newlocale(LC_ALL_MASK, "C", (locale_t) nullptr);
uselocale(loc);
// Don't free "C" or "GLOBAL" Locales
} else
old_locale = "C"; // prevents recursion
}
~LocaleSwitcherImpl() {
if (old_locale != "C") {
uselocale(old_loc);
freelocale(loc);
recurseLocale(ResetLocale);
}
}
public:
std::string old_locale;
#endif // _WIN32
};
}
// allows an RAII-like approach to ensuring the locale is temporarily "C"
// instead of whatever we started in.
LocaleSwitcher::LocaleSwitcher() : impl(new detail::LocaleSwitcherImpl) {}
LocaleSwitcher::~LocaleSwitcher() { delete impl; }
}
}
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