gdb/unittests/basic_string_view/inserters/char/2.cc

   1
   2 // Copyright (C) 2013-2023 Free Software Foundation, Inc.
   3 //
   4 // This file is part of the GNU ISO C++ Library.  This library is free
   5 // software; you can redistribute it and/or modify it under the
   6 // terms of the GNU General Public License as published by the
   7 // Free Software Foundation; either version 3, or (at your option)
   8 // any later version.
   9
  10 // This library is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License along
  16 // with this library; see the file COPYING3.  If not see
  17 // <http://www.gnu.org/licenses/>.
  18
  19 // inserters
  20
  21 // NB: This file is predicated on sstreams, ostreams
  22 // working, not to mention other major details like char_traits, and
  23 // all of the string_view class.
  24
  25 // { dg-options "-std=gnu++17" }
  26 // { dg-require-fileio "" }
  27
  28 namespace inserters_2 {
  29
  30 // testing basic_filebuf::xsputn via stress testing with large string_views
  31 // based on a bug report libstdc++ 9
  32 // mode == out
  33 static void
  34 test05 (std::size_t size)
  35 {
  36   bool test ATTRIBUTE_UNUSED = true;
  37
  38   const char filename[] = "inserters_extractors-2.txt";
  39   const char fillc = 'f';
  40   std::ofstream ofs(filename);
  41   std::string str(size, fillc);
  42   gdb::string_view strv{str};
  43
  44   // sanity checks
  45   VERIFY( str.size() == size );
  46   VERIFY( ofs.good() );
  47
  48   // stress test
  49   ofs << str << std::endl;
  50   if (!ofs.good())
  51     test = false;
  52
  53   ofs << str << std::endl;
  54   if (!ofs.good())
  55     test = false;
  56
  57   VERIFY( str.size() == size );
  58   VERIFY( ofs.good() );
  59
  60   ofs.close();
  61
  62   // sanity check on the written file
  63   std::ifstream ifs(filename);
  64   std::size_t count = 0;
  65   char c;
  66   while (count <= (2 * size) + 4)
  67     {
  68       ifs >> c;
  69       if (ifs.good() && c == fillc)
  70         {
  71           ++count;
  72           c = '0';
  73         }
  74       else
  75         break;
  76     }
  77
  78   VERIFY( count == 2 * size );
  79 }
  80
  81 static int
  82 main ()
  83 {
  84   test05(1);
  85   test05(1000);
  86   test05(10000);
  87
  88   return 0;
  89 }
  90
  91 } // namespace inserters_2