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

   1 // Copyright (C) 2004-2020 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 // 27.6.1.3 unformatted input functions
  19 // @require@ %-*.tst %-*.txt
  20 // @diff@ %-*.tst %-*.txt
  21
  22 // { dg-require-fileio "" }
  23
  24 #include <istream>
  25 #include <fstream>
  26 #include <limits>
  27 #include <testsuite_hooks.h>
  28
  29 // istream& ignore(streamsize n)
  30 void
  31 test01()
  32 {
  33   using namespace std;
  34
  35   const char filename[] ="istream_unformatted-1.txt";
  36   ios_base::iostate state1, state2;
  37
  38   wifstream ifstrm;
  39   ifstrm.open(filename);
  40
  41   state1 = ifstrm.rdstate();
  42   VERIFY( state1 == ios_base::goodbit );
  43   VERIFY( ifstrm.peek() == L'1' );
  44   state2 = ifstrm.rdstate();
  45   VERIFY( state1 == state2 );
  46
  47   state1 = ifstrm.rdstate();
  48   ifstrm.ignore(1);
  49   VERIFY( ifstrm.gcount() == 1 );
  50   state2 = ifstrm.rdstate();
  51   VERIFY( state1 == state2 );
  52   VERIFY( ifstrm.peek() == L'2' );
  53
  54   state1 = ifstrm.rdstate();
  55   ifstrm.ignore(10);
  56   VERIFY( ifstrm.gcount() == 10 );
  57   state2 = ifstrm.rdstate();
  58   VERIFY( state1 == state2 );
  59   VERIFY( ifstrm.peek() == L'1' );
  60
  61   state1 = ifstrm.rdstate();
  62   ifstrm.ignore(100);
  63   VERIFY( ifstrm.gcount() == 100 );
  64   state2 = ifstrm.rdstate();
  65   VERIFY( state1 == state2 );
  66   VERIFY( ifstrm.peek() == L'2' );
  67
  68   state1 = ifstrm.rdstate();
  69   ifstrm.ignore(1000);
  70   VERIFY( ifstrm.gcount() == 1000 );
  71   state2 = ifstrm.rdstate();
  72   VERIFY( state1 == state2 );
  73   VERIFY( ifstrm.peek() == L'1' );
  74
  75   state1 = ifstrm.rdstate();
  76   ifstrm.ignore(10000);
  77   VERIFY( ifstrm.gcount() == 10000 );
  78   state2 = ifstrm.rdstate();
  79   VERIFY( state1 == state2 );
  80   VERIFY( ifstrm.peek() == L'2' );
  81
  82   state1 = ifstrm.rdstate();
  83   ifstrm.ignore(numeric_limits<streamsize>::max());
  84   VERIFY( ifstrm.gcount() == 5389 );
  85   state2 = ifstrm.rdstate();
  86   VERIFY( state1 != state2 );
  87   VERIFY( state2 == ios_base::eofbit );
  88 }
  89
  90 int
  91 main()
  92 {
  93   test01();
  94   return 0;
  95 }