Subversion Repositories scarts

// std::ctype implementation details, GNU version -*- C++ -*-

// Copyright (C) 2001, 2002, 2003, 2004 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.

//

// ISO C++ 14882: 22.2.1.1.2  ctype virtual functions.

//

// Written by Benjamin Kosnik <bkoz@redhat.com>

#include <locale>

#include <bits/c++locale_internal.h>

namespace std

{

  // NB: The other ctype<char> specializations are in src/locale.cc and

  // various /config/os/* files.

  template<>

    ctype_byname<char>::ctype_byname(const char* __s, size_t __refs)

    : ctype<char>(0, false, __refs)

    {

      if (std::strcmp(__s, "C") != 0 && std::strcmp(__s, "POSIX") != 0)

        {

          this->_S_destroy_c_locale(this->_M_c_locale_ctype);

          this->_S_create_c_locale(this->_M_c_locale_ctype, __s);

          this->_M_toupper = this->_M_c_locale_ctype->__ctype_toupper;

          this->_M_tolower = this->_M_c_locale_ctype->__ctype_tolower;

          this->_M_table = this->_M_c_locale_ctype->__ctype_b;

        }

    }

#ifdef _GLIBCXX_USE_WCHAR_T  

  ctype<wchar_t>::__wmask_type

  ctype<wchar_t>::_M_convert_to_wmask(const mask __m) const

  {

    __wmask_type __ret;

    switch (__m)

      {

      case space:

        __ret = __wctype_l("space", _M_c_locale_ctype);

        break;

      case print:

        __ret = __wctype_l("print", _M_c_locale_ctype);

        break;

      case cntrl:

        __ret = __wctype_l("cntrl", _M_c_locale_ctype);

        break;

      case upper:

        __ret = __wctype_l("upper", _M_c_locale_ctype);

        break;

      case lower:

        __ret = __wctype_l("lower", _M_c_locale_ctype);

        break;

      case alpha:

        __ret = __wctype_l("alpha", _M_c_locale_ctype);

        break;

      case digit:

        __ret = __wctype_l("digit", _M_c_locale_ctype);

        break;

      case punct:

        __ret = __wctype_l("punct", _M_c_locale_ctype);

        break;

      case xdigit:

        __ret = __wctype_l("xdigit", _M_c_locale_ctype);

        break;

      case alnum:

        __ret = __wctype_l("alnum", _M_c_locale_ctype);

        break;

      case graph:

        __ret = __wctype_l("graph", _M_c_locale_ctype);

        break;

      default:

        __ret = __wmask_type();

      }

    return __ret;

  }

  wchar_t

  ctype<wchar_t>::do_toupper(wchar_t __c) const

  { return __towupper_l(__c, _M_c_locale_ctype); }

  const wchar_t*

  ctype<wchar_t>::do_toupper(wchar_t* __lo, const wchar_t* __hi) const

  {

    while (__lo < __hi)

      {

        *__lo = __towupper_l(*__lo, _M_c_locale_ctype);

        ++__lo;

      }

    return __hi;

  }

  wchar_t

  ctype<wchar_t>::do_tolower(wchar_t __c) const

  { return __towlower_l(__c, _M_c_locale_ctype); }

  const wchar_t*

  ctype<wchar_t>::do_tolower(wchar_t* __lo, const wchar_t* __hi) const

  {

    while (__lo < __hi)

      {

        *__lo = __towlower_l(*__lo, _M_c_locale_ctype);

        ++__lo;

      }

    return __hi;

  }

  bool

  ctype<wchar_t>::

  do_is(mask __m, wchar_t __c) const

  {

    // The case of __m == ctype_base::space is particularly important,

    // due to its use in many istream functions.  Therefore we deal with

    // it first, exploiting the knowledge that on GNU systems _M_bit[5]

    // is the mask corresponding to ctype_base::space.  NB: an encoding

    // change would not affect correctness!

    bool __ret = false;

    if (__m == _M_bit[5])

      __ret = __iswctype_l(__c, _M_wmask[5], _M_c_locale_ctype);

    else

      {

        // Highest bitmask in ctype_base == 10, but extra in "C"

        // library for blank.

        const size_t __bitmasksize = 11;

        for (size_t __bitcur = 0; __bitcur <= __bitmasksize; ++__bitcur)

          if (__m & _M_bit[__bitcur])

            {

              if (__iswctype_l(__c, _M_wmask[__bitcur], _M_c_locale_ctype))

                {

                  __ret = true;

                  break;

                }

              else if (__m == _M_bit[__bitcur])

                break;

            }

      }

    return __ret;

  }

  const wchar_t*

  ctype<wchar_t>::

  do_is(const wchar_t* __lo, const wchar_t* __hi, mask* __vec) const

  {

    for (; __lo < __hi; ++__vec, ++__lo)

      {

        // Highest bitmask in ctype_base == 10, but extra in "C"

        // library for blank.

        const size_t __bitmasksize = 11;

        mask __m = 0;

        for (size_t __bitcur = 0; __bitcur <= __bitmasksize; ++__bitcur)

          if (__iswctype_l(*__lo, _M_wmask[__bitcur], _M_c_locale_ctype))

            __m |= _M_bit[__bitcur];

        *__vec = __m;

      }

    return __hi;

  }

  const wchar_t*

  ctype<wchar_t>::

  do_scan_is(mask __m, const wchar_t* __lo, const wchar_t* __hi) const

  {

    while (__lo < __hi && !this->do_is(__m, *__lo))

      ++__lo;

    return __lo;

  }

  const wchar_t*

  ctype<wchar_t>::

  do_scan_not(mask __m, const char_type* __lo, const char_type* __hi) const

  {

    while (__lo < __hi && this->do_is(__m, *__lo) != 0)

      ++__lo;

    return __lo;

  }

  wchar_t

  ctype<wchar_t>::

  do_widen(char __c) const

  { return _M_widen[static_cast<unsigned char>(__c)]; }

  const char*

  ctype<wchar_t>::

  do_widen(const char* __lo, const char* __hi, wchar_t* __dest) const

  {

    while (__lo < __hi)

      {

        *__dest = _M_widen[static_cast<unsigned char>(*__lo)];

        ++__lo;

        ++__dest;

      }

    return __hi;

  }

  char

  ctype<wchar_t>::

  do_narrow(wchar_t __wc, char __dfault) const

  {

    if (__wc >= 0 && __wc < 128 && _M_narrow_ok)

      return _M_narrow[__wc];

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)

    __c_locale __old = __uselocale(_M_c_locale_ctype);

#endif

    const int __c = wctob(__wc);

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)

    __uselocale(__old);

#endif

    return (__c == EOF ? __dfault : static_cast<char>(__c));

  }

  const wchar_t*

  ctype<wchar_t>::

  do_narrow(const wchar_t* __lo, const wchar_t* __hi, char __dfault,

            char* __dest) const

  {

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)

    __c_locale __old = __uselocale(_M_c_locale_ctype);

#endif

    if (_M_narrow_ok)

      while (__lo < __hi)

        {

          if (*__lo >= 0 && *__lo < 128)

            *__dest = _M_narrow[*__lo];

          else

            {

              const int __c = wctob(*__lo);

              *__dest = (__c == EOF ? __dfault : static_cast<char>(__c));

            }

          ++__lo;

          ++__dest;

        }

    else

      while (__lo < __hi)

        {

          const int __c = wctob(*__lo);

          *__dest = (__c == EOF ? __dfault : static_cast<char>(__c));

          ++__lo;

          ++__dest;

        }

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)

    __uselocale(__old);

#endif

    return __hi;

  }

  void

  ctype<wchar_t>::_M_initialize_ctype()

  {

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)

    __c_locale __old = __uselocale(_M_c_locale_ctype);

#endif

    wint_t __i;

    for (__i = 0; __i < 128; ++__i)

      {

        const int __c = wctob(__i);

        if (__c == EOF)

          break;

        else

          _M_narrow[__i] = static_cast<char>(__c);

      }

    if (__i == 128)

      _M_narrow_ok = true;

    else

      _M_narrow_ok = false;

    for (size_t __j = 0;

         __j < sizeof(_M_widen) / sizeof(wint_t); ++__j)

      _M_widen[__j] = btowc(__j);

    for (size_t __k = 0; __k <= 11; ++__k)

      {

        _M_bit[__k] = static_cast<mask>(_ISbit(__k));

        _M_wmask[__k] = _M_convert_to_wmask(_M_bit[__k]);

      }

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)

    __uselocale(__old);

#endif

  }

#endif //  _GLIBCXX_USE_WCHAR_T

}