libstdc++-v3/testsuite/27_io/basic_ostream/seekp/char/2346-fstream.cc

   1 // 2000-06-29 bkoz
   2
   3 // Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
   4 // Free Software Foundation
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20 // USA.
  21
  22 // 27.6.2.4  basic_ostream seek members  [lib.ostream.seeks]
  23 // @require@ %-*.tst %-*.txt
  24 // @diff@ %-*.tst %-*.txt
  25
  26 // { dg-require-fileio "" }
  27
  28 #include <ostream>
  29 #include <istream>
  30 #include <fstream>
  31 #include <cstdlib>
  32 #include <testsuite_hooks.h>
  33
  34 const char* s = " lootpack, peanut butter wolf, rob swift, madlib, quasimoto";
  35 const int times = 10;
  36
  37 void write_rewind(std::iostream& stream)
  38 {
  39   bool test __attribute__((unused)) = true;
  40
  41   for (int j = 0; j < times; j++)
  42     {
  43       std::streampos begin = stream.tellp();
  44
  45       for (int i = 0; i < times; ++i)
  46         stream << j << '-' << i << s << '\n';
  47
  48       stream.seekp(begin);
  49     }
  50   VERIFY( stream.good() );
  51 }
  52
  53 void check_contents(std::iostream& stream)
  54 {
  55   bool test __attribute__((unused)) = true;
  56
  57   stream.clear();
  58   stream.seekg(0, std::ios::beg);
  59   int i = 0;
  60   int loop = times * times + 2;
  61   while (i < loop)
  62     {
  63       stream.ignore(80, '\n');
  64       if (stream.good())
  65         ++i;
  66       else
  67         break;
  68     }
  69   VERIFY( i == times );
  70 }
  71
  72 // fstream
  73 // libstdc++/2346
  74 void test02()
  75 {
  76   std::fstream ofstrm;
  77   ofstrm.open("istream_seeks-3.txt", std::ios::out);
  78   if (!ofstrm)
  79     std::abort();
  80   write_rewind(ofstrm);
  81   ofstrm.close();
  82
  83   std::fstream ifstrm;
  84   ifstrm.open("istream_seeks-3.txt", std::ios::in);
  85   check_contents(ifstrm);
  86   ifstrm.close();
  87 }
  88
  89 int main()
  90 {
  91   test02();
  92   return 0;
  93 }