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

   1 // Copyright (C) 2005, 2009 Free Software Foundation
   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   bool test __attribute__((unused)) = true;
  31
  32   for (int j = 0; j < times; j++)
  33     {
  34       std::streampos begin = stream.tellp();
  35
  36       for (int i = 0; i < times; ++i)
  37         stream << j << L'-' << i << s << L'\n';
  38
  39       stream.seekp(begin);
  40     }
  41   VERIFY( stream.good() );
  42 }
  43
  44 void check_contents(std::wiostream& stream)
  45 {
  46   bool test __attribute__((unused)) = true;
  47
  48   stream.clear();
  49   stream.seekg(0, std::wios::beg);
  50   int i = 0;
  51   int loop = times * times + 2;
  52   while (i < loop)
  53     {
  54       stream.ignore(80, L'\n');
  55       if (stream.good())
  56         ++i;
  57       else
  58         break;
  59     }
  60   VERIFY( i == times );
  61 }
  62
  63 // stringstream
  64 // libstdc++/2346
  65 // N.B. The original testcase was broken, using tellg/seekg in write_rewind.
  66 void test03()
  67 {
  68   std::wstringstream sstrm;
  69
  70   write_rewind(sstrm);
  71   check_contents(sstrm);
  72 }
  73
  74 int main()
  75 {
  76   test03();
  77   return 0;
  78 }