/*
 * Copyright 2004-2007, Axel Dörfler, axeld@pinc-software.de
 * Copyright 2010, Oliver Tappe, zooey@hirschkaefer.de
 * All rights reserved. Distributed under the terms of the MIT License.
 */


#include <ctype.h>
#include <locale.h>
#include <strings.h>

#include <ErrnoMaintainer.h>

#include "LocaleBackend.h"
#include "LocaleInternal.h"


using BPrivate::Libroot::gGlobalLocaleBackend;
using BPrivate::Libroot::GetLocalesFromEnvironment;
using BPrivate::Libroot::LocaleBackend;


extern "C" char*
setlocale(int category, const char* locale)
{
        BPrivate::ErrnoMaintainer errnoMaintainer;

        if (category < 0 || category > LC_LAST)
                return NULL;

        if (locale == NULL)
                return const_cast<char*>(getlocalename_l(category, LC_GLOBAL_LOCALE));

        // we may have to invoke SetLocale once for each category, so we use an
        // array to collect the locale per category
        const char* locales[LC_LAST + 1];
        for (int lc = 0; lc <= LC_LAST; lc++)
                locales[lc] = NULL;

        if (*locale == '\0')
                GetLocalesFromEnvironment(category, locales);
        else
                locales[category] = locale;

        if (gGlobalLocaleBackend == NULL) {
                // for any locale other than POSIX/C, we try to activate the ICU
                // backend
                bool needBackend = false;
                for (int lc = 0; lc <= LC_LAST; lc++) {
                        if (locales[lc] != NULL && strcasecmp(locales[lc], "POSIX") != 0
                                        && strcasecmp(locales[lc], "C") != 0) {
                                needBackend = true;
                                break;
                        }
                }
                if (needBackend && LocaleBackend::LoadBackend() != B_OK)
                        return NULL;
        }

        if (gGlobalLocaleBackend != NULL) {
                for (int lc = 0; lc <= LC_LAST; lc++) {
                        if (locales[lc] != NULL) {
                                locale = gGlobalLocaleBackend->SetLocale(lc, locales[lc]);
                                if (lc == LC_ALL) {
                                        // skip the rest, LC_ALL overrides
                                        return const_cast<char*>(locale);
                                }
                        }
                }
                return const_cast<char*>(gGlobalLocaleBackend->SetLocale(category, NULL));
        }

        return const_cast<char*>("POSIX");
}