libstdc++-v3/testsuite/experimental/string_view/inserters/char/2.cc

   1 // Copyright (C) 2013-2021 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 // inserters
  19
  20 // NB: This file is predicated on sstreams, ostreams
  21 // working, not to mention other major details like char_traits, and
  22 // all of the string_view class.
  23
  24 // { dg-do run { target c++14 } }
  25 // { dg-require-fileio "" }
  26
  27 #include <experimental/string_view>
  28 #include <string>
  29 #include <fstream>
  30 #include <iostream>
  31 #include <testsuite_hooks.h>
  32
  33 // testing basic_filebuf::xsputn via stress testing with large string_views
  34 // based on a bug report libstdc++ 9
  35 // mode == out
  36 void
  37 test05(std::size_t size)
  38 {
  39   const char filename[] = "inserters_extractors-2.txt";
  40   const char fillc = 'f';
  41   std::ofstream ofs(filename);
  42   std::string str(size, fillc);
  43   std::experimental::string_view strv{str};
  44
  45   // sanity checks
  46   VERIFY( str.size() == size );
  47   VERIFY( ofs.good() );
  48
  49   // stress test
  50   ofs << str << std::endl;
  51   if (!ofs.good())
  52     VERIFY( false );
  53
  54   ofs << str << std::endl;
  55   if (!ofs.good())
  56     VERIFY( false );
  57
  58   VERIFY( str.size() == size );
  59   VERIFY( ofs.good() );
  60
  61   ofs.close();
  62
  63   // sanity check on the written file
  64   std::ifstream ifs(filename);
  65   std::size_t count = 0;
  66   char c;
  67   while (count <= (2 * size) + 4)
  68     {
  69       ifs >> c;
  70       if (ifs.good() && c == fillc)
  71         {
  72           ++count;
  73           c = '0';
  74         }
  75       else
  76         break;
  77     }
  78
  79   VERIFY( count == 2 * size );
  80 }
  81
  82 int
  83 main()
  84 {
  85   test05(1);
  86   test05(1000);
  87   test05(10000);
  88
  89   return 0;
  90 }