old-autovect-branch/libstdc++-v3/testsuite/27_io/basic_ostream/seekp/char/2346-sstream.cc

   1 // 2000-06-29 bkoz
   2
   3 // Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation
   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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 27.6.2.4  basic_ostream seek members  [lib.ostream.seeks]
  22
  23 #include <ostream>
  24 #include <istream>
  25 #include <sstream>
  26 #include <testsuite_hooks.h>
  27
  28 const char* s = " lootpack, peanut butter wolf, rob swift, madlib, quasimoto";
  29 const int times = 10;
  30
  31 void write_rewind(std::iostream& stream)
  32 {
  33   bool test __attribute__((unused)) = true;
  34
  35   for (int j = 0; j < times; j++)
  36     {
  37       std::streampos begin = stream.tellp();
  38
  39       for (int i = 0; i < times; ++i)
  40         stream << j << '-' << i << s << '\n';
  41
  42       stream.seekp(begin);
  43     }
  44   VERIFY( stream.good() );
  45 }
  46
  47 void check_contents(std::iostream& stream)
  48 {
  49   bool test __attribute__((unused)) = true;
  50
  51   stream.clear();
  52   stream.seekg(0, std::ios::beg);
  53   int i = 0;
  54   int loop = times * times + 2;
  55   while (i < loop)
  56     {
  57       stream.ignore(80, '\n');
  58       if (stream.good())
  59         ++i;
  60       else
  61         break;
  62     }
  63   VERIFY( i == times );
  64 }
  65
  66 // stringstream
  67 // libstdc++/2346
  68 // N.B. The original testcase was broken, using tellg/seekg in write_rewind.
  69 void test03()
  70 {
  71   std::stringstream sstrm;
  72
  73   write_rewind(sstrm);
  74   check_contents(sstrm);
  75 }
  76
  77 int main()
  78 {
  79   test03();
  80   return 0;
  81 }