libstdc++-v3/testsuite/27_io/basic_istream/seekg/char/2346-fstream.cc

   1 // 2000-06-29 bkoz
   2
   3 // Copyright (C) 2000, 2001, 2002, 2003 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // 27.6.1.3 unformatted input functions
  22 // NB: ostream has a particular "seeks" category. Adopt this for istreams too.
  23 // @require@ %-*.tst %-*.txt
  24 // @diff@ %-*.tst %-*.txt
  25
  26 #include <istream>
  27 #include <sstream>
  28 #include <fstream>
  29 #include <testsuite_hooks.h>
  30
  31 const char* s = " lootpack, peanut butter wolf, rob swift, madlib, quasimoto";
  32 const int times = 10;
  33
  34 void write_rewind(std::iostream& stream)
  35 {
  36   for (int j = 0; j < times; j++)
  37     {
  38       bool test __attribute__((unused)) = true;
  39       std::streampos begin = stream.tellg();
  40
  41       for (int i = 0; i < times; ++i)
  42         stream << j << '-' << i << s << '\n';
  43
  44       stream.seekg(begin);
  45       std::streampos end = stream.tellg();
  46       std::streampos badpos = std::streampos(std::streambuf::off_type(-1));
  47     }
  48 }
  49
  50 void check_contents(std::iostream& stream)
  51 {
  52   bool test __attribute__((unused)) = true;
  53
  54   stream.clear();
  55   stream.seekg(0, std::ios::beg);
  56   int i = 0;
  57   int loop = times * times + 2;
  58   while (i < loop)
  59     {
  60       stream.ignore(80, '\n');
  61       if (stream.good())
  62         ++i;
  63       else
  64         break;
  65     }
  66   VERIFY( i == times );
  67 }
  68
  69 // fstream
  70 // libstdc++/2346
  71 void test02()
  72 {
  73   std::fstream ofstrm;
  74   ofstrm.open("istream_seeks-3.txt", std::ios::out);
  75   if (!ofstrm)
  76     std::abort();
  77   write_rewind(ofstrm);
  78   ofstrm.close();
  79
  80   std::fstream ifstrm;
  81   ifstrm.open("istream_seeks-3.txt", std::ios::in);
  82   check_contents(ifstrm);
  83   ifstrm.close();
  84 }
  85
  86 int main()
  87 {
  88   test02();
  89   return 0;
  90 }