83 lines
2.9 KiB
C++
83 lines
2.9 KiB
C++
/*
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Copyright (C) 2012 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <locale.h>
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#include "pbd/compose.h"
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#include "pbd/debug.h"
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#include "pbd/error.h"
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#include "pbd/locale_guard.h"
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using namespace PBD;
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/* The initial C++ locale is "C" regardless of the user's preferred locale.
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* The C locale from setlocale() matches the user's preferred locale
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*
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* Setting the C++ locale will change the C locale, but not the other way 'round.
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* and some plugin may change either behind our back.
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*/
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LocaleGuard::LocaleGuard ()
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: old_c (0)
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{
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char* actual = setlocale (LC_NUMERIC, NULL);
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if (strcmp ("C", actual)) {
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DEBUG_TRACE (DEBUG::Locale, string_compose ("LG: change locale from '%1' to 'C'\n", actual));
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/* purpose of LocaleGuard is to make sure we're using "C" for
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the numeric locale during its lifetime, so make it so.
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*/
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old_c = strdup (actual);
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/* this changes both C++ and C locale */
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std::locale::global (std::locale (std::locale::classic(), "C", std::locale::numeric));
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}
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if (old_cpp != std::locale::classic ()) {
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PBD::error << "LocaleGuard: initial C++ locale is not 'C'. Expect non-portable session files.\n";
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DEBUG_TRACE (DEBUG::Locale, "LG: initial C++ locale is not 'C'. Expect non-portable session files.\n");
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}
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}
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LocaleGuard::~LocaleGuard ()
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{
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char* actual = setlocale (LC_NUMERIC, NULL);
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std::locale current;
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if (current != old_cpp) {
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/* the C++ locale should always be "C", that's the default
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* at application start, and ardour never changes it to
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* anything but "C".
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*
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* if it's not: some plugin meddled with it.
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*/
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if (old_cpp != std::locale::classic ()) {
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PBD::error << "LocaleGuard: someone (a plugin) changed the C++ locale, expect non-portable session files.\n";
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DEBUG_TRACE (DEBUG::Locale, "LG: someone (a plugin) changed the C++ locale, expect non-portable session files.\n");
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}
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std::locale::global (old_cpp);
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DEBUG_TRACE (DEBUG::Locale, string_compose ("LG: restore C++ locale: '%1'\n", old_cpp.name ()));
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}
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if (old_c && strcmp (old_c, actual)) {
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setlocale (LC_NUMERIC, old_c);
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DEBUG_TRACE (DEBUG::Locale, string_compose ("LG: restore C locale: '%1'\n", old_c));
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}
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free (old_c);
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}
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