libstdc++-v3/testsuite/27_io/basic_istream/ignore/wchar_t/3.cc

   1 // Copyright (C) 2004-2018 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 // 27.6.1.3 unformatted input functions
  19 // @require@ %-*.tst %-*.txt
  20 // @diff@ %-*.tst %-*.txt
  21
  22 #include <istream>
  23 #include <fstream>
  24 #include <limits>
  25 #include <testsuite_hooks.h>
  26
  27 // istream& ignore(streamsize n)
  28 void
  29 test01()
  30 {
  31   using namespace std;
  32
  33   const char filename[] ="istream_unformatted-1.txt";
  34   ios_base::iostate state1, state2;
  35
  36   wifstream ifstrm;
  37   ifstrm.open(filename);
  38
  39   state1 = ifstrm.rdstate();
  40   VERIFY( state1 == ios_base::goodbit );
  41   VERIFY( ifstrm.peek() == L'1' );
  42   state2 = ifstrm.rdstate();
  43   VERIFY( state1 == state2 );
  44
  45   state1 = ifstrm.rdstate();
  46   ifstrm.ignore(1);
  47   VERIFY( ifstrm.gcount() == 1 );
  48   state2 = ifstrm.rdstate();
  49   VERIFY( state1 == state2 );
  50   VERIFY( ifstrm.peek() == L'2' );
  51
  52   state1 = ifstrm.rdstate();
  53   ifstrm.ignore(10);
  54   VERIFY( ifstrm.gcount() == 10 );
  55   state2 = ifstrm.rdstate();
  56   VERIFY( state1 == state2 );
  57   VERIFY( ifstrm.peek() == L'1' );
  58
  59   state1 = ifstrm.rdstate();
  60   ifstrm.ignore(100);
  61   VERIFY( ifstrm.gcount() == 100 );
  62   state2 = ifstrm.rdstate();
  63   VERIFY( state1 == state2 );
  64   VERIFY( ifstrm.peek() == L'2' );
  65
  66   state1 = ifstrm.rdstate();
  67   ifstrm.ignore(1000);
  68   VERIFY( ifstrm.gcount() == 1000 );
  69   state2 = ifstrm.rdstate();
  70   VERIFY( state1 == state2 );
  71   VERIFY( ifstrm.peek() == L'1' );
  72
  73   state1 = ifstrm.rdstate();
  74   ifstrm.ignore(10000);
  75   VERIFY( ifstrm.gcount() == 10000 );
  76   state2 = ifstrm.rdstate();
  77   VERIFY( state1 == state2 );
  78   VERIFY( ifstrm.peek() == L'2' );
  79
  80   state1 = ifstrm.rdstate();
  81   ifstrm.ignore(numeric_limits<streamsize>::max());
  82   VERIFY( ifstrm.gcount() == 5389 );
  83   state2 = ifstrm.rdstate();
  84   VERIFY( state1 != state2 );
  85   VERIFY( state2 == ios_base::eofbit );
  86 }
  87
  88 int
  89 main()
  90 {
  91   test01();
  92   return 0;
  93 }