libstdc++-v3/testsuite/27_io/basic_filebuf/sungetc/char/2-in.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001-2013 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 // { dg-require-fileio "" }
  23
  24 #include <fstream>
  25 #include <testsuite_hooks.h>
  26 #include <testsuite_io.h>
  27
  28 // @require@ %-*.tst %-*.txt
  29 // @diff@ %-*.tst %*.txt
  30
  31 const char name_01[] = "sgetc.txt"; // file with data in it
  32
  33 // Test overloaded virtual functions.
  34 void test01()
  35 {
  36   using namespace std;
  37   using namespace __gnu_test;
  38   typedef std::filebuf::int_type        int_type;
  39   typedef filebuf::traits_type          traits_type;
  40
  41   bool test __attribute__((unused)) = true;
  42   int_type                              c1, c2, c3;
  43
  44   // int_type sungetc()
  45   // if in_cur not avail, return pbackfail(), else decrement and
  46   // return to_int_type(*gptr())
  47
  48   // in
  49   {
  50     constraint_filebuf fb_01;
  51     fb_01.pubsetbuf(0, 0);
  52     fb_01.open(name_01, ios::in);
  53     VERIFY( fb_01.unbuffered() );
  54     c1 = fb_01.sbumpc();
  55     VERIFY( c1 == '/' );
  56     c2 = fb_01.sungetc();
  57     VERIFY( c2 == c1 );
  58     c3 = fb_01.sgetc();
  59     VERIFY( c3 == c2 );
  60     fb_01.pubseekoff(2, ios_base::beg, ios_base::in);
  61     c1 = fb_01.sgetc();
  62     VERIFY( c1 == ' ' );
  63     c2 = fb_01.sungetc();
  64     VERIFY( c2 == traits_type::not_eof(traits_type::eof()) );
  65     VERIFY( fb_01.unbuffered() );
  66   }
  67 }
  68
  69 int main()
  70 {
  71   test01();
  72   return 0;
  73 }