libstdc++-v3/testsuite/21_strings/basic_string/inserters_extractors/char/5.cc

   1 // 1999-07-01 bkoz
   2
   3 // Copyright (C) 1999-2020 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 // 21.3.7.9 inserters and extractors
  21
  22 // NB: This file is predicated on sstreams, istreams, and ostreams
  23 // working, not to mention other major details like char_traits, and
  24 // all of the string class.
  25
  26 // { dg-require-fileio "" }
  27
  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 strings
  34 // based on a bug report libstdc++ 9
  35 // mode == out
  36 void test05(std::size_t size)
  37 {
  38   bool test = true;
  39   const char filename[] = "inserters_extractors-1.txt";
  40   const char fillc = 'f';
  41   std::ofstream ofs(filename);
  42   std::string str(size, fillc);
  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 int main()
  82 {
  83   test05(1);
  84   test05(1000);
  85   test05(10000);
  86   return 0;
  87 }