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Provide a single static instance of C++ locale.

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We can't use std::locale::global because all streams imbue it by
default and if it's not 'C' (aka std::locale::classic) then we
must imbue all the streams that we don't want localized, and that's
most of them.

Provides error checking for setting the C++ locale from the environment.
This is necessary both because the environment might have an invalid
locale, which would cause an unhandled exception crash.

On windows std::locale("") can't handle some Microsoft-style locale
strings (e.g. Spanish_Spain) so we use boost::locale's gen("") function
to set the locale--though even that can't handle a Microsoft-style
locale string with an appended charset (e.g. Spanish_Spain.1252) and
that's what glibc's setlocale(LC_ALL, NULL) emits.
This commit is contained in:
John Ralls
2019-01-06 09:52:43 -08:00
parent cee97be8d4
commit b4fedff90e
10 changed files with 139 additions and 8 deletions
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78
libgnucash/core-utils/gnc-locale-utils.cpp Normal file
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/********************************************************************\
* gnc-locale-utils.cpp -- provide a default locale for C++ *
* Copyright (C) 2019 John Ralls <jralls@ceridwen.us *
* *
* 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, contact: *
* *
* Free Software Foundation Voice: +1-617-542-5942 *
* 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652 *
* Boston, MA 02110-1301, USA gnu@gnu.org *
\********************************************************************/
#include <clocale>
#include <boost/locale.hpp>
#include "gnc-locale-utils.hpp"
/* This function addresses two separate problems: First, if we set
* std::locale::global then all streams automagically imbue
* themselves with it and we have to re-imbue all of the backends and
* logging streams with std::locale::classic() so that data and log
* files aren't localized. Second, calling std::locale("") is slow,
* so we want to do it only once. Worse, the standard C++ library in
* Mingw64 chokes on at least some Microsoft-style locale strings
* (e.g. "Spanish_Spain") but libc's setlocale(LC_ALL, NULL) emits
* them even if originally fed a Unix-style locale ("es_ES").
*
* The solution is this function which caches the setlocale() locale
* the first time it's called and which uses a boost::locale
* generator, which does know what to do with (sometimes adjusted)
* Microsoft locale strings.
*/
const std::locale&
gnc_get_locale()
{
static std::locale cached;
static bool tried_already = false;
if (!tried_already)
{
boost::locale::generator gen;
tried_already = true;
try
{
cached = gen("");
}
catch (const std::runtime_error& err)
{
std::string c_locale(setlocale(LC_ALL, nullptr));
std::cerr << "[gnc_get_locale] Failed to create app-default locale from " << c_locale << " because " << err.what() << "\n";
auto dot = c_locale.find(".");
if (dot != std::string::npos)
{
try
{
cached = gen(c_locale.substr(0, dot));
}
catch (std::runtime_error& err2)
{
std::cerr << "[gnc_get_locale] Failed to create app-default locale from " << c_locale << " because " << err.what() << " so using the 'C' locale for C++.\n";
}
}
else
{
std::cerr << "[gnc_get_locale] Using the 'C' locale for C++\n";
}
}
}
return cached;
}