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 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // 27.8.1.4 Overridden virtual functions
  22
  23 #include <fstream>
  24 #include <locale>
  25 #include <string>
  26 #include <testsuite_hooks.h>
  27
  28 // Check that basic_filebuf::underflow() handles
  29 // codecvt::always_noconv() == false and codecvt::in() == noconv.
  30 class NoconvCvt : public std::codecvt<char, char, std::mbstate_t>
  31 {
  32 protected:
  33   virtual bool
  34   do_always_noconv() const throw()
  35   { return false; }
  36
  37   virtual result
  38   do_in(state_type&, const char* from, const char*, const char*& from_next,
  39         char* to, char*, char*& to_next)
  40   {
  41     from_next = from;
  42     to_next = to;
  43     return noconv;
  44   }
  45 };
  46
  47 void test01()
  48 {
  49   using namespace std;
  50   bool test __attribute__((unused)) = true;
  51   const char* name = "filebuf_virtuals-1.txt";
  52
  53   string str;
  54   filebuf fb;
  55   filebuf::int_type c1;
  56
  57   if (fb.open(name, ios_base::in))
  58     {
  59       while ((c1 = fb.sbumpc()) != EOF)
  60         str.push_back(filebuf::traits_type::to_char_type(c1));
  61       fb.close();
  62     }
  63
  64   locale loc(locale::classic(), new NoconvCvt);
  65   fb.pubimbue(loc);
  66
  67   if (fb.open(name, ios_base::in))
  68     {
  69       for (string::iterator i = str.begin(); i != str.end(); ++i)
  70         {
  71           c1 = fb.sbumpc();
  72           VERIFY( c1 != filebuf::traits_type::eof() );
  73           VERIFY( c1 == filebuf::traits_type::to_int_type(*i) );
  74         }
  75       VERIFY( fb.sgetc() == filebuf::traits_type::eof() );
  76       fb.close();
  77     }
  78 }
  79
  80 int main()
  81 {
  82   test01();
  83   return 0;
  84 }