libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/1.cc

   1 // 2003-05-03  Petur Runolfsson  <peturr02@ru.is>
   2
   3 // Copyright (C) 2003, 2009 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 27.8.1.4 Overridden virtual functions
  21
  22 #include <fstream>
  23 #include <locale>
  24 #include <string>
  25 #include <testsuite_hooks.h>
  26
  27 // Check that basic_filebuf::underflow() handles
  28 // codecvt::always_noconv() == false and codecvt::in() == noconv.
  29 class NoconvCvt : public std::codecvt<char, char, std::mbstate_t>
  30 {
  31 protected:
  32   virtual bool
  33   do_always_noconv() const throw()
  34   { return false; }
  35
  36   virtual result
  37   do_in(state_type&, const char* from, const char*, const char*& from_next,
  38         char* to, char*, char*& to_next)
  39   {
  40     from_next = from;
  41     to_next = to;
  42     return noconv;
  43   }
  44 };
  45
  46 void test01()
  47 {
  48   using namespace std;
  49   bool test __attribute__((unused)) = true;
  50   const char* name = "filebuf_virtuals-1.txt";
  51
  52   string str;
  53   filebuf fb;
  54   filebuf::int_type c1;
  55
  56   if (fb.open(name, ios_base::in))
  57     {
  58       while ((c1 = fb.sbumpc()) != EOF)
  59         str.push_back(filebuf::traits_type::to_char_type(c1));
  60       fb.close();
  61     }
  62
  63   locale loc(locale::classic(), new NoconvCvt);
  64   fb.pubimbue(loc);
  65
  66   if (fb.open(name, ios_base::in))
  67     {
  68       for (string::iterator i = str.begin(); i != str.end(); ++i)
  69         {
  70           c1 = fb.sbumpc();
  71           VERIFY( c1 != filebuf::traits_type::eof() );
  72           VERIFY( c1 == filebuf::traits_type::to_int_type(*i) );
  73         }
  74       VERIFY( fb.sgetc() == filebuf::traits_type::eof() );
  75       fb.close();
  76     }
  77 }
  78
  79 int main()
  80 {
  81   test01();
  82   return 0;
  83 }