libstdc++-v3/config/locale/gnu/ctype_members.cc

   1 // std::ctype implementation details, GNU version -*- C++ -*-
   2
   3 // Copyright (C) 2001-2019 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 //
  26 // ISO C++ 14882: 22.2.1.1.2  ctype virtual functions.
  27 //
  28
  29 // Written by Benjamin Kosnik <bkoz@redhat.com>
  30
  31 #include <locale>
  32 #include <cstdio>
  33 #include <bits/c++locale_internal.h>
  34
  35 namespace std _GLIBCXX_VISIBILITY(default)
  36 {
  37 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  38
  39   // NB: The other ctype<char> specializations are in src/locale.cc and
  40   // various /config/os/* files.
  41   ctype_byname<char>::ctype_byname(const char* __s, size_t __refs)
  42   : ctype<char>(0, false, __refs)
  43   {
  44     if (std::strcmp(__s, "C") != 0 && std::strcmp(__s, "POSIX") != 0)
  45       {
  46         this->_S_destroy_c_locale(this->_M_c_locale_ctype);
  47         this->_S_create_c_locale(this->_M_c_locale_ctype, __s);
  48         this->_M_toupper = this->_M_c_locale_ctype->__ctype_toupper;
  49         this->_M_tolower = this->_M_c_locale_ctype->__ctype_tolower;
  50         this->_M_table = this->_M_c_locale_ctype->__ctype_b;
  51       }
  52   }
  53
  54   ctype_byname<char>::~ctype_byname()
  55   { }
  56
  57 #ifdef _GLIBCXX_USE_WCHAR_T
  58   ctype<wchar_t>::__wmask_type
  59   ctype<wchar_t>::_M_convert_to_wmask(const mask __m) const throw()
  60   {
  61     __wmask_type __ret;
  62     switch (__m)
  63       {
  64       case space:
  65         __ret = __wctype_l("space", _M_c_locale_ctype);
  66         break;
  67       case print:
  68         __ret = __wctype_l("print", _M_c_locale_ctype);
  69         break;
  70       case cntrl:
  71         __ret = __wctype_l("cntrl", _M_c_locale_ctype);
  72         break;
  73       case upper:
  74         __ret = __wctype_l("upper", _M_c_locale_ctype);
  75         break;
  76       case lower:
  77         __ret = __wctype_l("lower", _M_c_locale_ctype);
  78         break;
  79       case alpha:
  80         __ret = __wctype_l("alpha", _M_c_locale_ctype);
  81         break;
  82       case digit:
  83         __ret = __wctype_l("digit", _M_c_locale_ctype);
  84         break;
  85       case punct:
  86         __ret = __wctype_l("punct", _M_c_locale_ctype);
  87         break;
  88       case xdigit:
  89         __ret = __wctype_l("xdigit", _M_c_locale_ctype);
  90         break;
  91       case alnum:
  92         __ret = __wctype_l("alnum", _M_c_locale_ctype);
  93         break;
  94       case graph:
  95         __ret = __wctype_l("graph", _M_c_locale_ctype);
  96         break;
  97       case blank:
  98         __ret = __wctype_l("blank", _M_c_locale_ctype);
  99         break;
 100       default:
 101         __ret = __wmask_type();
 102       }
 103     return __ret;
 104   }
 105
 106   wchar_t
 107   ctype<wchar_t>::do_toupper(wchar_t __c) const
 108   { return __towupper_l(__c, _M_c_locale_ctype); }
 109
 110   const wchar_t*
 111   ctype<wchar_t>::do_toupper(wchar_t* __lo, const wchar_t* __hi) const
 112   {
 113     while (__lo < __hi)
 114       {
 115         *__lo = __towupper_l(*__lo, _M_c_locale_ctype);
 116         ++__lo;
 117       }
 118     return __hi;
 119   }
 120
 121   wchar_t
 122   ctype<wchar_t>::do_tolower(wchar_t __c) const
 123   { return __towlower_l(__c, _M_c_locale_ctype); }
 124
 125   const wchar_t*
 126   ctype<wchar_t>::do_tolower(wchar_t* __lo, const wchar_t* __hi) const
 127   {
 128     while (__lo < __hi)
 129       {
 130         *__lo = __towlower_l(*__lo, _M_c_locale_ctype);
 131         ++__lo;
 132       }
 133     return __hi;
 134   }
 135
 136   bool
 137   ctype<wchar_t>::
 138   do_is(mask __m, wchar_t __c) const
 139   {
 140     // The case of __m == ctype_base::space is particularly important,
 141     // due to its use in many istream functions.  Therefore we deal with
 142     // it first, exploiting the knowledge that on GNU systems _M_bit[5]
 143     // is the mask corresponding to ctype_base::space.  NB: an encoding
 144     // change would not affect correctness!
 145     bool __ret = false;
 146     if (__m == _M_bit[5])
 147       __ret = __iswctype_l(__c, _M_wmask[5], _M_c_locale_ctype);
 148     else
 149       {
 150         // Highest bitmask in ctype_base == 11
 151         const size_t __bitmasksize = 11;
 152         for (size_t __bitcur = 0; __bitcur <= __bitmasksize; ++__bitcur)
 153           if (__m & _M_bit[__bitcur])
 154             {
 155               if (__iswctype_l(__c, _M_wmask[__bitcur], _M_c_locale_ctype))
 156                 {
 157                   __ret = true;
 158                   break;
 159                 }
 160               else if (__m == _M_bit[__bitcur])
 161                 break;
 162             }
 163       }
 164     return __ret;
 165   }
 166
 167   const wchar_t*
 168   ctype<wchar_t>::
 169   do_is(const wchar_t* __lo, const wchar_t* __hi, mask* __vec) const
 170   {
 171     for (; __lo < __hi; ++__vec, ++__lo)
 172       {
 173         // Highest bitmask in ctype_base == 11
 174         const size_t __bitmasksize = 11;
 175         mask __m = 0;
 176         for (size_t __bitcur = 0; __bitcur <= __bitmasksize; ++__bitcur)
 177           if (__iswctype_l(*__lo, _M_wmask[__bitcur], _M_c_locale_ctype))
 178             __m |= _M_bit[__bitcur];
 179         *__vec = __m;
 180       }
 181     return __hi;
 182   }
 183
 184   const wchar_t*
 185   ctype<wchar_t>::
 186   do_scan_is(mask __m, const wchar_t* __lo, const wchar_t* __hi) const
 187   {
 188     while (__lo < __hi && !this->do_is(__m, *__lo))
 189       ++__lo;
 190     return __lo;
 191   }
 192
 193   const wchar_t*
 194   ctype<wchar_t>::
 195   do_scan_not(mask __m, const char_type* __lo, const char_type* __hi) const
 196   {
 197     while (__lo < __hi && this->do_is(__m, *__lo) != 0)
 198       ++__lo;
 199     return __lo;
 200   }
 201
 202   wchar_t
 203   ctype<wchar_t>::
 204   do_widen(char __c) const
 205   { return _M_widen[static_cast<unsigned char>(__c)]; }
 206
 207   const char*
 208   ctype<wchar_t>::
 209   do_widen(const char* __lo, const char* __hi, wchar_t* __dest) const
 210   {
 211     while (__lo < __hi)
 212       {
 213         *__dest = _M_widen[static_cast<unsigned char>(*__lo)];
 214         ++__lo;
 215         ++__dest;
 216       }
 217     return __hi;
 218   }
 219
 220   char
 221   ctype<wchar_t>::
 222   do_narrow(wchar_t __wc, char __dfault) const
 223   {
 224     if (__wc >= 0 && __wc < 128 && _M_narrow_ok)
 225       return _M_narrow[__wc];
 226 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
 227     __c_locale __old = __uselocale(_M_c_locale_ctype);
 228 #endif
 229     const int __c = wctob(__wc);
 230 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
 231     __uselocale(__old);
 232 #endif
 233     return (__c == EOF ? __dfault : static_cast<char>(__c));
 234   }
 235
 236   const wchar_t*
 237   ctype<wchar_t>::
 238   do_narrow(const wchar_t* __lo, const wchar_t* __hi, char __dfault,
 239             char* __dest) const
 240   {
 241 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
 242     __c_locale __old = __uselocale(_M_c_locale_ctype);
 243 #endif
 244     if (_M_narrow_ok)
 245       while (__lo < __hi)
 246         {
 247           if (*__lo >= 0 && *__lo < 128)
 248             *__dest = _M_narrow[*__lo];
 249           else
 250             {
 251               const int __c = wctob(*__lo);
 252               *__dest = (__c == EOF ? __dfault : static_cast<char>(__c));
 253             }
 254           ++__lo;
 255           ++__dest;
 256         }
 257     else
 258       while (__lo < __hi)
 259         {
 260           const int __c = wctob(*__lo);
 261           *__dest = (__c == EOF ? __dfault : static_cast<char>(__c));
 262           ++__lo;
 263           ++__dest;
 264         }
 265 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
 266     __uselocale(__old);
 267 #endif
 268     return __hi;
 269   }
 270
 271   void
 272   ctype<wchar_t>::_M_initialize_ctype() throw()
 273   {
 274 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
 275     __c_locale __old = __uselocale(_M_c_locale_ctype);
 276 #endif
 277     wint_t __i;
 278     for (__i = 0; __i < 128; ++__i)
 279       {
 280         const int __c = wctob(__i);
 281         if (__c == EOF)
 282           break;
 283         else
 284           _M_narrow[__i] = static_cast<char>(__c);
 285       }
 286     if (__i == 128)
 287       _M_narrow_ok = true;
 288     else
 289       _M_narrow_ok = false;
 290     for (size_t __j = 0;
 291          __j < sizeof(_M_widen) / sizeof(wint_t); ++__j)
 292       _M_widen[__j] = btowc(__j);
 293
 294     for (size_t __k = 0; __k <= 11; ++__k)
 295       {
 296         _M_bit[__k] = static_cast<mask>(_ISbit(__k));
 297         _M_wmask[__k] = _M_convert_to_wmask(_M_bit[__k]);
 298       }
 299 #if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
 300     __uselocale(__old);
 301 #endif
 302   }
 303 #endif //  _GLIBCXX_USE_WCHAR_T
 304
 305 _GLIBCXX_END_NAMESPACE_VERSION
 306 } // namespace