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      1 // Copyright (C) 2000-2022 Free Software Foundation, Inc.
      2 //
      3 // This file is part of the GNU ISO C++ Library.  This library is free
      4 // software; you can redistribute it and/or modify it under the
      5 // terms of the GNU General Public License as published by the
      6 // Free Software Foundation; either version 3, or (at your option)
      7 // any later version.
      8 
      9 // This library is distributed in the hope that it will be useful,
     10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
     11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     12 // GNU General Public License for more details.
     13 
     14 // Under Section 7 of GPL version 3, you are granted additional
     15 // permissions described in the GCC Runtime Library Exception, version
     16 // 3.1, as published by the Free Software Foundation.
     17 
     18 // You should have received a copy of the GNU General Public License and
     19 // a copy of the GCC Runtime Library Exception along with this program;
     20 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     21 // <http://www.gnu.org/licenses/>.
     22 
     23 // Written by Benjamin Kosnik <bkoz (at) redhat.com>
     24 
     25 #include <locale>
     26 
     27 namespace std _GLIBCXX_VISIBILITY(default)
     28 {
     29 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     30 
     31   // Definitions for locale::id of standard facets that are specialized.
     32  locale::id codecvt<char, char, mbstate_t>::id;
     33 
     34 #ifdef _GLIBCXX_USE_WCHAR_T
     35   locale::id codecvt<wchar_t, char, mbstate_t>::id;
     36 #endif
     37 
     38   codecvt<char, char, mbstate_t>::
     39   codecvt(size_t __refs)
     40   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
     41   _M_c_locale_codecvt(_S_get_c_locale())
     42   { }
     43 
     44   codecvt<char, char, mbstate_t>::
     45   codecvt(__c_locale __cloc, size_t __refs)
     46   : __codecvt_abstract_base<char, char, mbstate_t>(__refs),
     47   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
     48   { }
     49 
     50   codecvt<char, char, mbstate_t>::
     51   ~codecvt()
     52   { _S_destroy_c_locale(_M_c_locale_codecvt); }
     53 
     54   codecvt_base::result
     55   codecvt<char, char, mbstate_t>::
     56   do_out(state_type&, const intern_type* __from,
     57 	 const intern_type*, const intern_type*& __from_next,
     58 	 extern_type* __to, extern_type*,
     59 	 extern_type*& __to_next) const
     60   {
     61     // _GLIBCXX_RESOLVE_LIB_DEFECTS
     62     // According to the resolution of DR19, "If returns noconv [...]
     63     // there are no changes to the values in [to, to_limit)."
     64     __from_next = __from;
     65     __to_next = __to;
     66     return noconv;
     67   }
     68 
     69   codecvt_base::result
     70   codecvt<char, char, mbstate_t>::
     71   do_unshift(state_type&, extern_type* __to,
     72              extern_type*, extern_type*& __to_next) const
     73   {
     74     __to_next = __to;
     75     return noconv;
     76   }
     77 
     78   codecvt_base::result
     79   codecvt<char, char, mbstate_t>::
     80   do_in(state_type&, const extern_type* __from,
     81 	const extern_type*, const extern_type*& __from_next,
     82 	intern_type* __to, intern_type*, intern_type*& __to_next) const
     83   {
     84     // _GLIBCXX_RESOLVE_LIB_DEFECTS
     85     // According to the resolution of DR19, "If returns noconv [...]
     86     // there are no changes to the values in [to, to_limit)."
     87     __from_next = __from;
     88     __to_next = __to;
     89     return noconv;
     90   }
     91 
     92   int
     93   codecvt<char, char, mbstate_t>::
     94   do_encoding() const throw()
     95   { return 1; }
     96 
     97   bool
     98   codecvt<char, char, mbstate_t>::
     99   do_always_noconv() const throw()
    100   { return true; }
    101 
    102   int
    103   codecvt<char, char, mbstate_t>::
    104   do_length (state_type&, const extern_type* __from,
    105 	     const extern_type* __end, size_t __max) const
    106   {
    107     size_t __d = static_cast<size_t>(__end - __from);
    108     return std::min(__max, __d);
    109   }
    110 
    111   int
    112   codecvt<char, char, mbstate_t>::
    113   do_max_length() const throw()
    114   { return 1; }
    115 
    116 #ifdef _GLIBCXX_USE_WCHAR_T
    117   // codecvt<wchar_t, char, mbstate_t> required specialization
    118   codecvt<wchar_t, char, mbstate_t>::
    119   codecvt(size_t __refs)
    120   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
    121   _M_c_locale_codecvt(_S_get_c_locale())
    122   { }
    123 
    124   codecvt<wchar_t, char, mbstate_t>::
    125   codecvt(__c_locale __cloc, size_t __refs)
    126   : __codecvt_abstract_base<wchar_t, char, mbstate_t>(__refs),
    127   _M_c_locale_codecvt(_S_clone_c_locale(__cloc))
    128   { }
    129 
    130   codecvt<wchar_t, char, mbstate_t>::
    131   ~codecvt()
    132   { _S_destroy_c_locale(_M_c_locale_codecvt); }
    133 
    134   codecvt_base::result
    135   codecvt<wchar_t, char, mbstate_t>::
    136   do_unshift(state_type&, extern_type* __to,
    137 	     extern_type*, extern_type*& __to_next) const
    138   {
    139     // XXX Probably wrong for stateful encodings
    140     __to_next = __to;
    141     return noconv;
    142   }
    143 
    144   bool
    145   codecvt<wchar_t, char, mbstate_t>::
    146   do_always_noconv() const throw()
    147   { return false; }
    148 #endif //  _GLIBCXX_USE_WCHAR_T
    149 
    150 _GLIBCXX_END_NAMESPACE_VERSION
    151 } // namespace
    152