libstdc++-v3/testsuite/27_io/basic_filebuf/imbue/12206.cc

   1 // Copyright (C) 2003-2020 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 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 27.8.1.4 Overridden virtual functions
  19
  20 #include <fstream>
  21
  22 typedef unsigned char Char;
  23
  24 namespace std
  25 {
  26   template <>
  27   class codecvt<Char, char, mbstate_t> :
  28     public locale::facet, public codecvt_base
  29   {
  30   public:
  31     typedef Char intern_type;
  32     typedef char extern_type;
  33     typedef mbstate_t state_type;
  34
  35     explicit codecvt(size_t refs = 0)
  36       : locale::facet(refs) { }
  37     result out(mbstate_t& state, const Char* from,
  38                const Char* from_end, const Char*& from_next,
  39                char* to, char* to_limit, char*& to_next) const
  40     {
  41       return do_out(state, from, from_end, from_next,
  42                     to, to_limit, to_next);
  43     }
  44     result in(mbstate_t& state, const char* from,
  45               const char* from_end, const char*& from_next,
  46               Char* to, Char* to_limit, Char*& to_next) const
  47     {
  48       return do_in(state, from, from_end, from_next,
  49                    to, to_limit, to_next);
  50     }
  51     result unshift(mbstate_t& state, char* to, char* to_end,
  52                    char*& to_next) const
  53     { return do_unshift(state, to, to_end, to_next); }
  54     int length(mbstate_t& state, const char* from,
  55                const char* from_end, size_t max) const
  56     { return do_length(state, from, from_end, max); }
  57     int encoding() const throw()
  58     { return do_encoding(); }
  59     bool always_noconv() const throw()
  60     { return do_always_noconv(); }
  61     int max_length() const throw()
  62     { return do_max_length(); }
  63
  64     static locale::id id;
  65
  66   protected:
  67     virtual result do_out(mbstate_t&, const Char*,
  68                           const Char*,
  69                           const Char*&, char*,
  70                           char*, char*&) const
  71     { return ok; }
  72     virtual result do_in(mbstate_t&, const char*,
  73                          const char*,
  74                          const char*&, Char*,
  75                          Char*, Char*&) const
  76     { return ok; }
  77     virtual result do_unshift(mbstate_t&, char*, char*,
  78                               char*&) const
  79     { return noconv; }
  80     virtual int do_length(mbstate_t&, const char*,
  81                           const char*, size_t) const
  82     { return 1; }
  83     virtual int do_encoding() const throw()
  84     { return 1; }
  85     virtual bool do_always_noconv() const throw()
  86     { return false; }
  87     virtual int do_max_length() const throw()
  88     { return 1; }
  89   };
  90
  91   locale::id codecvt<Char, char, mbstate_t>::id;
  92 }
  93
  94 // libstdc++/12206
  95 void test01()
  96 {
  97   using namespace std;
  98
  99   locale loc(locale::classic(),
 100              new codecvt<Char, char, std::mbstate_t>);
 101   locale::global(loc);
 102
 103   basic_filebuf<Char, char_traits<Char> > fb;
 104
 105   loc = locale::classic();
 106   locale::global(loc);
 107   fb.pubimbue(loc);
 108
 109   fb.open("tmp_12206", ios_base::out);
 110   try
 111     {
 112       fb.pubseekoff(0, ios_base::cur);
 113     }
 114   catch (std::exception&)
 115     {
 116     }
 117   fb.close();
 118 }
 119
 120 int main()
 121 {
 122   test01();
 123   return 0;
 124 }