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 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 // 27.6.2.4  basic_ostream seek members  [lib.ostream.seeks]
  22 // @require@ %-*.tst %-*.txt
  23 // @diff@ %-*.tst %-*.txt
  24
  25 #include <ostream>
  26 #include <istream>
  27 #include <fstream>
  28 #include <testsuite_hooks.h>
  29
  30 const char* s = " lootpack, peanut butter wolf, rob swift, madlib, quasimoto";
  31 const int times = 10;
  32
  33 void write_rewind(std::iostream& stream)
  34 {
  35   bool test __attribute__((unused)) = true;
  36
  37   for (int j = 0; j < times; j++)
  38     {
  39       std::streampos begin = stream.tellp();
  40
  41       for (int i = 0; i < times; ++i)
  42         stream << j << '-' << i << s << '\n';
  43
  44       stream.seekp(begin);
  45     }
  46   VERIFY( stream.good() );
  47 }
  48
  49 void check_contents(std::iostream& stream)
  50 {
  51   bool test __attribute__((unused)) = true;
  52
  53   stream.clear();
  54   stream.seekg(0, std::ios::beg);
  55   int i = 0;
  56   int loop = times * times + 2;
  57   while (i < loop)
  58     {
  59       stream.ignore(80, '\n');
  60       if (stream.good())
  61         ++i;
  62       else
  63         break;
  64     }
  65   VERIFY( i == times );
  66 }
  67
  68 // fstream
  69 // libstdc++/2346
  70 void test02()
  71 {
  72   std::fstream ofstrm;
  73   ofstrm.open("istream_seeks-3.txt", std::ios::out);
  74   if (!ofstrm)
  75     std::abort();
  76   write_rewind(ofstrm);
  77   ofstrm.close();
  78
  79   std::fstream ifstrm;
  80   ifstrm.open("istream_seeks-3.txt", std::ios::in);
  81   check_contents(ifstrm);
  82   ifstrm.close();
  83 }
  84
  85 int main()
  86 {
  87   test02();
  88   return 0;
  89 }