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/*
Copyright (C) 2012 Paul Davis
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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <locale.h>
#include "pbd/locale_guard.h"
#include "pbd/error.h"
using namespace PBD;
/* The initial C++ locale is "C" regardless of the user's preferred locale.
* The C locale from setlocale() matches the user's preferred locale
*
* Setting the C++ locale will change the C locale, but not the other way 'round.
* and some plugin may change either behind our back.
*/
LocaleGuard::LocaleGuard ()
: old_c (0)
{
char* actual = setlocale (LC_NUMERIC, NULL);
if (strcmp ("C", actual)) {
/* purpose of LocaleGuard is to make sure we're using "C" for
the numeric locale during its lifetime, so make it so.
*/
old_c = strdup (actual);
/* this changes both C++ and C locale */
std::locale::global (std::locale (std::locale::classic(), "C", std::locale::numeric));
}
if (old_cpp != std::locale::classic ()) {
PBD::error << "LocaleGuard: initial C++ locale is not 'C'. Expect non-portable session files.\n";
}
}
LocaleGuard::~LocaleGuard ()
{
char* actual = setlocale (LC_NUMERIC, NULL);
std::locale current;
if (current != old_cpp) {
/* the C++ locale should always be "C", that's the default
* at application start, and ardour never changes it to
* anything but "C".
*
* if it's not: some plugin meddled with it.
*/
if (old_cpp != std::locale::classic ()) {
PBD::error << "LocaleGuard: someone (a plugin) changed the C++ locale, expect non-portable session files.\n";
}
std::locale::global (old_cpp);
}
if (old_c && strcmp (old_c, actual)) {
setlocale (LC_NUMERIC, old_c);
}
free (old_c);
}
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