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

   1 // 2004-06-20  Paolo Carlini  <pcarlini@suse.de>
   2
   3 // Copyright (C) 2004-2024 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 // 27.6.1.3 unformatted input functions
  21 // @require@ %-*.tst %-*.txt
  22 // @diff@ %-*.tst %-*.txt
  23
  24 // { dg-require-fileio "" }
  25
  26 #include <istream>
  27 #include <fstream>
  28 #include <limits>
  29 #include <testsuite_hooks.h>
  30
  31 // istream& ignore(streamsize n)
  32 void
  33 test01()
  34 {
  35   using namespace std;
  36
  37   const char filename[] ="istream_unformatted-1.txt";
  38   ios_base::iostate state1, state2;
  39
  40   ifstream ifstrm;
  41   ifstrm.open(filename);
  42
  43   state1 = ifstrm.rdstate();
  44   VERIFY( state1 == ios_base::goodbit );
  45   VERIFY( ifstrm.peek() == '1' );
  46   state2 = ifstrm.rdstate();
  47   VERIFY( state1 == state2 );
  48
  49   state1 = ifstrm.rdstate();
  50   ifstrm.ignore(1);
  51   VERIFY( ifstrm.gcount() == 1 );
  52   state2 = ifstrm.rdstate();
  53   VERIFY( state1 == state2 );
  54   VERIFY( ifstrm.peek() == '2' );
  55
  56   state1 = ifstrm.rdstate();
  57   ifstrm.ignore(10);
  58   VERIFY( ifstrm.gcount() == 10 );
  59   state2 = ifstrm.rdstate();
  60   VERIFY( state1 == state2 );
  61   VERIFY( ifstrm.peek() == '1' );
  62
  63   state1 = ifstrm.rdstate();
  64   ifstrm.ignore(100);
  65   VERIFY( ifstrm.gcount() == 100 );
  66   state2 = ifstrm.rdstate();
  67   VERIFY( state1 == state2 );
  68   VERIFY( ifstrm.peek() == '2' );
  69
  70   state1 = ifstrm.rdstate();
  71   ifstrm.ignore(1000);
  72   VERIFY( ifstrm.gcount() == 1000 );
  73   state2 = ifstrm.rdstate();
  74   VERIFY( state1 == state2 );
  75   VERIFY( ifstrm.peek() == '1' );
  76
  77   state1 = ifstrm.rdstate();
  78   ifstrm.ignore(10000);
  79   VERIFY( ifstrm.gcount() == 10000 );
  80   state2 = ifstrm.rdstate();
  81   VERIFY( state1 == state2 );
  82   VERIFY( ifstrm.peek() == '2' );
  83
  84   state1 = ifstrm.rdstate();
  85   ifstrm.ignore(numeric_limits<streamsize>::max());
  86   VERIFY( ifstrm.gcount() == 5389 );
  87   state2 = ifstrm.rdstate();
  88   VERIFY( state1 != state2 );
  89   VERIFY( state2 == ios_base::eofbit );
  90 }
  91
  92 int
  93 main()
  94 {
  95   test01();
  96   return 0;
  97 }