libstdc++-v3/config/os/generic/ctype_inline.h

   1 // Locale support -*- C++ -*-
   2
   3 // Copyright (C) 2000-2018 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 /** @file bits/ctype_inline.h
  26  *  This is an internal header file, included by other library headers.
  27  *  Do not attempt to use it directly. @headername{locale}
  28  */
  29
  30 //
  31 // ISO C++ 14882: 22.1  Locales
  32 //
  33
  34 // ctype bits to be inlined go here. Non-inlinable (ie virtual do_*)
  35 // functions go in ctype.cc
  36
  37 // The following definitions are portable, but insanely slow. If one
  38 // cares at all about performance, then specialized ctype
  39 // functionality should be added for the native os in question: see
  40 // the config/os/bits/ctype_*.h files.
  41
  42 // Constructing a synthetic "C" table should be seriously considered...
  43
  44 namespace std _GLIBCXX_VISIBILITY(default)
  45 {
  46 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  47
  48   bool
  49   ctype<char>::
  50   is(mask __m, char __c) const
  51   {
  52     if (_M_table)
  53       return _M_table[static_cast<unsigned char>(__c)] & __m;
  54     else
  55       {
  56         bool __ret = false;
  57         const size_t __bitmasksize = 15;
  58         size_t __bitcur = 0; // Lowest bitmask in ctype_base == 0
  59         for (; __bitcur <= __bitmasksize; ++__bitcur)
  60           {
  61             const mask __bit = static_cast<mask>(1 << __bitcur);
  62             if (__m & __bit)
  63               {
  64                 bool __testis;
  65                 switch (__bit)
  66                   {
  67                   case space:
  68                     __testis = isspace(__c);
  69                     break;
  70                   case print:
  71                     __testis = isprint(__c);
  72                     break;
  73                   case cntrl:
  74                     __testis = iscntrl(__c);
  75                     break;
  76                   case upper:
  77                     __testis = isupper(__c);
  78                     break;
  79                   case lower:
  80                     __testis = islower(__c);
  81                     break;
  82                   case alpha:
  83                     __testis = isalpha(__c);
  84                     break;
  85                   case digit:
  86                     __testis = isdigit(__c);
  87                     break;
  88                   case punct:
  89                     __testis = ispunct(__c);
  90                     break;
  91                   case xdigit:
  92                     __testis = isxdigit(__c);
  93                     break;
  94                   case alnum:
  95                     __testis = isalnum(__c);
  96                     break;
  97                   case graph:
  98                     __testis = isgraph(__c);
  99                     break;
 100 #ifdef _GLIBCXX_USE_C99_CTYPE_TR1
 101                   case blank:
 102                     __testis = isblank(__c);
 103                     break;
 104 #endif
 105                   default:
 106                     __testis = false;
 107                     break;
 108                   }
 109                 __ret |= __testis;
 110               }
 111           }
 112         return __ret;
 113       }
 114   }
 115
 116   const char*
 117   ctype<char>::
 118   is(const char* __low, const char* __high, mask* __vec) const
 119   {
 120     if (_M_table)
 121       while (__low < __high)
 122         *__vec++ = _M_table[static_cast<unsigned char>(*__low++)];
 123     else
 124       {
 125         // Highest bitmask in ctype_base == 11.
 126         const size_t __bitmasksize = 15;
 127         for (;__low < __high; ++__vec, ++__low)
 128           {
 129             mask __m = 0;
 130             // Lowest bitmask in ctype_base == 0
 131             size_t __i = 0;
 132             for (;__i <= __bitmasksize; ++__i)
 133               {
 134                 const mask __bit = static_cast<mask>(1 << __i);
 135                 if (this->is(__bit, *__low))
 136                   __m |= __bit;
 137               }
 138             *__vec = __m;
 139           }
 140       }
 141     return __high;
 142   }
 143
 144   const char*
 145   ctype<char>::
 146   scan_is(mask __m, const char* __low, const char* __high) const
 147   {
 148     if (_M_table)
 149       while (__low < __high
 150              && !(_M_table[static_cast<unsigned char>(*__low)] & __m))
 151         ++__low;
 152     else
 153       while (__low < __high && !this->is(__m, *__low))
 154         ++__low;
 155     return __low;
 156   }
 157
 158   const char*
 159   ctype<char>::
 160   scan_not(mask __m, const char* __low, const char* __high) const
 161   {
 162     if (_M_table)
 163       while (__low < __high
 164              && (_M_table[static_cast<unsigned char>(*__low)] & __m) != 0)
 165         ++__low;
 166     else
 167       while (__low < __high && this->is(__m, *__low) != 0)
 168         ++__low;
 169     return __low;
 170   }
 171
 172 _GLIBCXX_END_NAMESPACE_VERSION
 173 } // namespace