libstdc++-v3/testsuite/27_io/basic_ostream/seekp/wchar_t/2346-sstream.cc

   1 // Copyright (C) 2005-2024 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 // 27.6.2.4  basic_ostream seek members  [lib.ostream.seeks]
  19
  20 #include <ostream>
  21 #include <istream>
  22 #include <sstream>
  23 #include <testsuite_hooks.h>
  24
  25 const wchar_t* s = L" lootpack, peanut butter wolf, rob swift, madlib, quasimoto";
  26 const int times = 10;
  27
  28 void write_rewind(std::wiostream& stream)
  29 {
  30   for (int j = 0; j < times; j++)
  31     {
  32       std::streampos begin = stream.tellp();
  33
  34       for (int i = 0; i < times; ++i)
  35         stream << j << L'-' << i << s << L'\n';
  36
  37       stream.seekp(begin);
  38     }
  39   VERIFY( stream.good() );
  40 }
  41
  42 void check_contents(std::wiostream& stream)
  43 {
  44   stream.clear();
  45   stream.seekg(0, std::wios::beg);
  46   int i = 0;
  47   int loop = times * times + 2;
  48   while (i < loop)
  49     {
  50       stream.ignore(80, L'\n');
  51       if (stream.good())
  52         ++i;
  53       else
  54         break;
  55     }
  56   VERIFY( i == times );
  57 }
  58
  59 // stringstream
  60 // libstdc++/2346
  61 // N.B. The original testcase was broken, using tellg/seekg in write_rewind.
  62 void test03()
  63 {
  64   std::wstringstream sstrm;
  65
  66   write_rewind(sstrm);
  67   check_contents(sstrm);
  68 }
  69
  70 int main()
  71 {
  72   test03();
  73   return 0;
  74 }