gcc/libstdc++-v3/include/bits/locale_classes.tcc

// Locale support -*- C++ -*-

// Copyright (C) 2007 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library 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, or (at your option)
// any later version.

// This library 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 library; see the file COPYING.  If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

/** @file locale_classes.tcc
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

//
// ISO C++ 14882: 22.1  Locales
//

#ifndef _LOCALE_CLASSES_TCC
#define _LOCALE_CLASSES_TCC 1

#pragma GCC system_header

_GLIBCXX_BEGIN_NAMESPACE(std)

  template<typename _Facet>
    locale::locale(const locale& __other, _Facet* __f)
    {
      _M_impl = new _Impl(*__other._M_impl, 1);

      try
	{ _M_impl->_M_install_facet(&_Facet::id, __f); }
      catch(...)
	{
	  _M_impl->_M_remove_reference();
	  __throw_exception_again;
	}
      delete [] _M_impl->_M_names[0];
      _M_impl->_M_names[0] = 0;   // Unnamed.
    }

  template<typename _Facet>
    locale
    locale::combine(const locale& __other) const
    {
      _Impl* __tmp = new _Impl(*_M_impl, 1);
      try
	{
	  __tmp->_M_replace_facet(__other._M_impl, &_Facet::id);
	}
      catch(...)
	{
	  __tmp->_M_remove_reference();
	  __throw_exception_again;
	}
      return locale(__tmp);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    bool
    locale::operator()(const basic_string<_CharT, _Traits, _Alloc>& __s1,
                       const basic_string<_CharT, _Traits, _Alloc>& __s2) const
    {
      typedef std::collate<_CharT> __collate_type;
      const __collate_type& __collate = use_facet<__collate_type>(*this);
      return (__collate.compare(__s1.data(), __s1.data() + __s1.length(),
				__s2.data(), __s2.data() + __s2.length()) < 0);
    }


  // Generic version does nothing.
  template<typename _CharT>
    int
    collate<_CharT>::_M_compare(const _CharT*, const _CharT*) const
    { return 0; }

  // Generic version does nothing.
  template<typename _CharT>
    size_t
    collate<_CharT>::_M_transform(_CharT*, const _CharT*, size_t) const
    { return 0; }

  template<typename _CharT>
    int
    collate<_CharT>::
    do_compare(const _CharT* __lo1, const _CharT* __hi1,
	       const _CharT* __lo2, const _CharT* __hi2) const
    {
      // strcoll assumes zero-terminated strings so we make a copy
      // and then put a zero at the end.
      const string_type __one(__lo1, __hi1);
      const string_type __two(__lo2, __hi2);

      const _CharT* __p = __one.c_str();
      const _CharT* __pend = __one.data() + __one.length();
      const _CharT* __q = __two.c_str();
      const _CharT* __qend = __two.data() + __two.length();

      // strcoll stops when it sees a nul character so we break
      // the strings into zero-terminated substrings and pass those
      // to strcoll.
      for (;;)
	{
	  const int __res = _M_compare(__p, __q);
	  if (__res)
	    return __res;

	  __p += char_traits<_CharT>::length(__p);
	  __q += char_traits<_CharT>::length(__q);
	  if (__p == __pend && __q == __qend)
	    return 0;
	  else if (__p == __pend)
	    return -1;
	  else if (__q == __qend)
	    return 1;

	  __p++;
	  __q++;
	}
    }

  template<typename _CharT>
    typename collate<_CharT>::string_type
    collate<_CharT>::
    do_transform(const _CharT* __lo, const _CharT* __hi) const
    {
      string_type __ret;

      // strxfrm assumes zero-terminated strings so we make a copy
      const string_type __str(__lo, __hi);

      const _CharT* __p = __str.c_str();
      const _CharT* __pend = __str.data() + __str.length();

      size_t __len = (__hi - __lo) * 2;

      _CharT* __c = new _CharT[__len];

      try
	{
	  // strxfrm stops when it sees a nul character so we break
	  // the string into zero-terminated substrings and pass those
	  // to strxfrm.
	  for (;;)
	    {
	      // First try a buffer perhaps big enough.
	      size_t __res = _M_transform(__c, __p, __len);
	      // If the buffer was not large enough, try again with the
	      // correct size.
	      if (__res >= __len)
		{
		  __len = __res + 1;
		  delete [] __c, __c = 0;
		  __c = new _CharT[__len];
		  __res = _M_transform(__c, __p, __len);
		}

	      __ret.append(__c, __res);
	      __p += char_traits<_CharT>::length(__p);
	      if (__p == __pend)
		break;

	      __p++;
	      __ret.push_back(_CharT());
	    }
	}
      catch(...)
	{
	  delete [] __c;
	  __throw_exception_again;
	}

      delete [] __c;

      return __ret;
    }

  template<typename _CharT>
    long
    collate<_CharT>::
    do_hash(const _CharT* __lo, const _CharT* __hi) const
    {
      unsigned long __val = 0;
      for (; __lo < __hi; ++__lo)
	__val =
	  *__lo + ((__val << 7)
		   | (__val >> (__gnu_cxx::__numeric_traits<unsigned long>::
				__digits - 7)));
      return static_cast<long>(__val);
    }

  // Inhibit implicit instantiations for required instantiations,
  // which are defined via explicit instantiations elsewhere.
  // NB: This syntax is a GNU extension.
#if _GLIBCXX_EXTERN_TEMPLATE
  extern template class collate<char>;
  extern template class collate_byname<char>;

  extern template
    const collate<char>&
    use_facet<collate<char> >(const locale&);

  extern template
    bool
    has_facet<collate<char> >(const locale&);

#ifdef _GLIBCXX_USE_WCHAR_T
  extern template class collate<wchar_t>;
  extern template class collate_byname<wchar_t>;

  extern template
    const collate<wchar_t>&
    use_facet<collate<wchar_t> >(const locale&);

  extern template
    bool
    has_facet<collate<wchar_t> >(const locale&);
#endif
#endif

_GLIBCXX_END_NAMESPACE

#endif