windows-nt/Source/XPSP1/NT/base/crts/crtw32/stdcpp/locale0.cpp

// locale0 -- class locale basic member functions
#include <climits>
#include <locale>
#include <xdebug>

struct _Fac_node
	{	// node for lazy facet recording
	_Fac_node(_Fac_node *_Nextarg, std::locale::facet *_Facptrarg)
		: _Next(_Nextarg), _Facptr(_Facptrarg)
		{	// construct a node with value
		}

	~_Fac_node()
		{	// destroy a facet
		_DELETE_CRT(_Facptr->_Decref());
		}

	_Fac_node *_Next;
	std::locale::facet *_Facptr;
	};

static _Fac_node *_Fac_head = 0;

_C_STD_BEGIN
_EXTERN_C
void __cdecl _Fac_tidy()
	{	// destroy lazy facets
	std::_Lockit lock(_LOCK_LOCALE);	// prevent double delete
	for (; _Fac_head != 0; )
		{	// destroy a lazy facet node
		_Fac_node *nodeptr = _Fac_head;
		_Fac_head = nodeptr->_Next;
		_DELETE_CRT(nodeptr);
		}
	}

void __cdecl _Deletegloballocale(void *ptr)
	{	// delete a global locale reference
	std::locale::_Locimp *locptr = *(std::locale::_Locimp **)ptr;
	if (locptr != 0)
		_DELETE_CRT(locptr->_Decref());
	}

static std::locale::_Locimp *global_locale = 0;	// pointer to current locale

static void __cdecl tidy_global()
	{	// delete static global locale reference
	std::_Lockit lock(_LOCK_LOCALE);	// prevent double delete
	_Deletegloballocale(&global_locale);
	}

std::locale::_Locimp *__cdecl _Getgloballocale()
	{	// return pointer to current locale
	return (global_locale);
	}

void __cdecl _Setgloballocale(void *ptr)
	{	// alter pointer to current locale
	static bool registered = false;

	if (!registered)
		{	// register cleanup first time
		registered = true;
		::_Atexit(&tidy_global);
		}
	global_locale = (std::locale::_Locimp *)ptr;
	}
_END_EXTERN_C
_C_STD_END

_STD_BEGIN

 #pragma warning(disable: 4786)

static locale classic_locale(_Noinit);	// "C" locale object, uninitialized
locale::_Locimp *locale::_Locimp::_Clocptr = 0;	// pointer to classic_locale
int locale::id::_Id_cnt = 0;	// unique id counter for facets

_TEMPLATE_STAT const size_t ctype<char>::table_size =
	1 << CHAR_BIT;	// size of ctype mapping table, typically 256

locale::locale() _THROW0()
	: _Ptr(_Init())
	{	// construct from current locale
	::_Getgloballocale()->_Incref();
	}

const locale& __cdecl locale::classic()
	{	// get reference to "C" locale
	_Init();
	return (classic_locale);
	}

locale __cdecl locale::empty()
	{	// make empty transparent locale
	_Init();
	return (locale(_NEW_CRT _Locimp(true)));
	}

const locale::facet *locale::_Getfacet(size_t id) const
	{	// look up a facet in locale object
	const facet *facptr = id < _Ptr->_Facetcount
		? _Ptr->_Facetvec[id] : 0;	// null if id off end
	if (facptr != 0 || !_Ptr->_Xparent)
		return (facptr);	// found facet or not transparent, return pointer
	else
		{	// look in current locale
		locale::_Locimp *_Ptr = ::_Getgloballocale();
		return (id < _Ptr->_Facetcount
			? _Ptr->_Facetvec[id]	// get from current locale
			: 0);	// no entry in current locale
		}
	}

bool locale::operator==(const locale& loc) const
	{	// compare locales for equality
	return (_Ptr == loc._Ptr
		|| name().compare("*") != 0 && name().compare(loc.name()) == 0);
	}

locale::_Locimp *__cdecl locale::_Init()
	{	// setup global and "C" locales
	locale::_Locimp *_Ptr = ::_Getgloballocale();
	if (_Ptr == 0)
		{	// lock and test again
		_Lockit lock(_LOCK_LOCALE);	// prevent double initialization

		_Ptr = ::_Getgloballocale();
		if (_Ptr == 0)
			{	// create new locales
			::_Setgloballocale(_Ptr = _NEW_CRT _Locimp);
			_Ptr->_Catmask = all;	// set current locale to "C"
			_Ptr->_Name = "C";

			_Locimp::_Clocptr = _Ptr;	// set classic to match
			_Locimp::_Clocptr->_Incref();
			new (&classic_locale) locale(_Locimp::_Clocptr);
			}
		}
	return (_Ptr);
	}

void locale::facet::_Register()
	{	// queue up lazy facet for destruction
	if (_Fac_head == 0)
		::_Atexit(&_Fac_tidy);
	
	_Fac_head = _NEW_CRT _Fac_node(_Fac_head, this);
	}

locale::_Locimp::_Locimp(bool transparent)
	: locale::facet(1), _Facetvec(0), _Facetcount(0),
		_Catmask(none), _Xparent(transparent), _Name("*")
	{	// construct an empty _Locimp
	}

locale::_Locimp::~_Locimp()
	{	// destruct a _Locimp
	_Lockit lock(_LOCK_LOCALE);	// prevent double delete
	for (size_t count = _Facetcount; 0 < count; )
		if (_Facetvec[--count] != 0)
			_DELETE_CRT(_Facetvec[count]->_Decref());
	free(_Facetvec);
	}

_Locinfo::_Locinfo(const char *locname)
	: _Lock(_LOCK_LOCALE)
	{	// switch to a named locale
	_Oldlocname = setlocale(LC_ALL, 0);
	_Newlocname = locname == 0
		|| (locname = setlocale(LC_ALL, locname)) == 0
			? "*" : locname;
	}

_Locinfo::~_Locinfo()
	{	// destroy a _Locinfo object, revert locale
	if (0 < _Oldlocname.size())
		setlocale(LC_ALL, _Oldlocname.c_str());
	}
_STD_END

/*
* Copyright (c) 1992-2001 by P.J. Plauger.  ALL RIGHTS RESERVED.
 * Consult your license regarding permissions and restrictions.
 V3.10:0009 */