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

   1 // Locale support -*- C++ -*-
   2
   3 // Copyright (C) 2000, 2003 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 2, 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  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   bool
  45   ctype<char>::
  46   is(mask __m, char __c) const
  47   {
  48     if (_M_table)
  49       return _M_table[static_cast<unsigned char>(__c)] & __m;
  50     else
  51       {
  52         bool __ret = false;
  53         const size_t __bitmasksize = 15;
  54         size_t __bitcur = 0; // Lowest bitmask in ctype_base == 0
  55         for (; __bitcur <= __bitmasksize; ++__bitcur)
  56           {
  57             const mask __bit = static_cast<mask>(1 << __bitcur);
  58             if (__m & __bit)
  59               {
  60                 bool __testis;
  61                 switch (__bit)
  62                   {
  63                   case space:
  64                     __testis = isspace(__c);
  65                     break;
  66                   case print:
  67                     __testis = isprint(__c);
  68                     break;
  69                   case cntrl:
  70                     __testis = iscntrl(__c);
  71                     break;
  72                   case upper:
  73                     __testis = isupper(__c);
  74                     break;
  75                   case lower:
  76                     __testis = islower(__c);
  77                     break;
  78                   case alpha:
  79                     __testis = isalpha(__c);
  80                     break;
  81                   case digit:
  82                     __testis = isdigit(__c);
  83                     break;
  84                   case punct:
  85                     __testis = ispunct(__c);
  86                     break;
  87                   case xdigit:
  88                     __testis = isxdigit(__c);
  89                     break;
  90                   case alnum:
  91                     __testis = isalnum(__c);
  92                     break;
  93                   case graph:
  94                     __testis = isgraph(__c);
  95                     break;
  96                   default:
  97                     __testis = false;
  98                     break;
  99                   }
 100                 __ret |= __testis;
 101               }
 102           }
 103         return __ret;
 104       }
 105   }
 106
 107   const char*
 108   ctype<char>::
 109   is(const char* __low, const char* __high, mask* __vec) const
 110   {
 111     if (_M_table)
 112       while (__low < __high)
 113         *__vec++ = _M_table[static_cast<unsigned char>(*__low++)];
 114     else
 115       {
 116         // Highest bitmask in ctype_base == 10.
 117         const size_t __bitmasksize = 15;
 118         for (;__low < __high; ++__vec, ++__low)
 119           {
 120             mask __m = 0;
 121             // Lowest bitmask in ctype_base == 0
 122             size_t __i = 0;
 123             for (;__i <= __bitmasksize; ++__i)
 124               {
 125                 const mask __bit = static_cast<mask>(1 << __i);
 126                 if (this->is(__bit, *__low))
 127                   __m |= __bit;
 128               }
 129             *__vec = __m;
 130           }
 131       }
 132     return __high;
 133   }
 134
 135   const char*
 136   ctype<char>::
 137   scan_is(mask __m, const char* __low, const char* __high) const
 138   {
 139     if (_M_table)
 140       while (__low < __high
 141              && !(_M_table[static_cast<unsigned char>(*__low)] & __m))
 142         ++__low;
 143     else
 144       while (__low < __high && !this->is(__m, *__low))
 145         ++__low;
 146     return __low;
 147   }
 148
 149   const char*
 150   ctype<char>::
 151   scan_not(mask __m, const char* __low, const char* __high) const
 152   {
 153     if (_M_table)
 154       while (__low < __high
 155              && (_M_table[static_cast<unsigned char>(*__low)] & __m) != 0)
 156         ++__low;
 157     else
 158       while (__low < __high && this->is(__m, *__low) != 0)
 159         ++__low;
 160     return __low;
 161   }