132 lines
4.8 KiB
C++
132 lines
4.8 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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/* Neither C nor C++ pick up a user's preferred locale choice without the
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* application actively taking steps to make this happen.
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*
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* For C: setlocale (LC_ALL, "");
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* For C++ (assuming that the C version was called):
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* std::locale::global (std::locale (setlocale (LC_ALL, 0)));
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*
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* The application needs to make these calls, probably in main().
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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_locale (0)
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{
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/* A LocaleGuard object ensures that the
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* LC_NUMERIC/std::locale::numeric aspect of the C and C++ locales are
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* set to "C" during its lifetime, so that printf/iostreams use a
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* portable format for numeric output (i.e. 1234.5 is always 1234.5 and
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* not sometimes 1234,5, as it would be in fr or de locales)
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*/
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char const * const current_c_locale = setlocale (LC_NUMERIC, 0);
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if (strcmp ("C", current_c_locale) != 0) {
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old_c_locale = strdup (current_c_locale);
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try {
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/* set the C++ global/default locale to whatever we are using
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* now, but with "C" numeric handling.
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*
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* this also sets the C locale, so no additional call to setlocale() is required.
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*/
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std::locale::global (std::locale (old_cpp_locale, "C", std::locale::numeric));
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pre_cpp_locale = std::locale();
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DEBUG_TRACE (DEBUG::Locale, string_compose ("LG: change C & C++ locale from '%1' => %2\n", old_cpp_locale.name(), pre_cpp_locale.name()));
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} catch (...) {
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/* Apple in particular have historically done a
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* terrible job supporting setlocale and even more so
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* with the C++ API. Using any locale other than "C" or
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* "POSIX" will fail, and in the case of the C++ API,
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* will throw an exception. In that case, just try to
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* use setlocale() to reset *only* the numeric aspect
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* of the current locale settings back to "C", which is
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* likely to work everywhere.
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*/
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setlocale (LC_NUMERIC, "C");
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pre_cpp_locale = std::locale();
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DEBUG_TRACE (DEBUG::Locale, string_compose ("LG: C++ locale API failed, change just C locale from '%1' => 'C' (C++ locale is %2)\n", old_c_locale, pre_cpp_locale.name()));
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}
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}
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}
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LocaleGuard::~LocaleGuard ()
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{
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char const * current_c_locale = setlocale (LC_NUMERIC, 0);
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std::locale current_cpp_locale;
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if (current_cpp_locale != pre_cpp_locale) {
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PBD::warning << string_compose ("LocaleGuard: someone (a plugin) changed the C++ locale from\n\t%1\nto\n\t%2\n, expect non-portable session files. Decimal OK ? %2",
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old_cpp_locale.name(), current_cpp_locale.name(),
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(std::use_facet<std::numpunct<char> >(std::locale()).decimal_point() == '.'))
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<< endmsg;
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try {
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/* this resets C & C++ locales */
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std::locale::global (old_cpp_locale);
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DEBUG_TRACE (DEBUG::Locale, string_compose ("LG: restore C & C++ locale: '%1'\n", std::locale().name()));
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} catch (...) {
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/* see comments in the constructor regarding the
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* exception.
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*
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* This should restore restore numeric handling back to
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* the default (which may reflect user
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* preferences). This probably can't fail, because
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* old_c_locale was already in use during the
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* constructor for this object.
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*
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* Still ... Apple ... locale support ... just sayin' ....
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*/
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setlocale (LC_NUMERIC, old_c_locale);
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DEBUG_TRACE (DEBUG::Locale, string_compose ("LG: C++ locale API failed, restore C locale from %1 to\n'%2'\n(C++ is '%3')\n", current_c_locale, old_c_locale, std::locale().name()));
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}
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} else if (old_c_locale && (strcmp (current_c_locale, old_c_locale) != 0)) {
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/* reset only the C locale */
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setlocale (LC_NUMERIC, old_c_locale);
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DEBUG_TRACE (DEBUG::Locale, string_compose ("LG: restore C locale from %1 to\n'%2'\n(C++ is '%3')\n", current_c_locale, old_c_locale, std::locale().name()));
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}
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free (const_cast<char*> (old_c_locale));
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}
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