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

   1 // Copyright (C) 2005-2021 Free Software Foundation, Inc.
   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 // { dg-require-fileio "" }
  19
  20 // 27.6.2.4  basic_ostream seek members  [lib.ostream.seeks]
  21 // @require@ %-*.tst %-*.txt
  22 // @diff@ %-*.tst %-*.txt
  23
  24 #include <ostream>
  25 #include <istream>
  26 #include <fstream>
  27 #include <cstdlib>
  28 #include <testsuite_hooks.h>
  29
  30 const wchar_t* s = L" lootpack, peanut butter wolf, rob swift, madlib, quasimoto";
  31 const int times = 10;
  32
  33 void write_rewind(std::wiostream& stream)
  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 << L'-' << i << s << L'\n';
  41
  42       stream.seekp(begin);
  43     }
  44   VERIFY( stream.good() );
  45 }
  46
  47 void check_contents(std::wiostream& stream)
  48 {
  49   stream.clear();
  50   stream.seekg(0, std::wios::beg);
  51   int i = 0;
  52   int loop = times * times + 2;
  53   while (i < loop)
  54     {
  55       stream.ignore(80, L'\n');
  56       if (stream.good())
  57         ++i;
  58       else
  59         break;
  60     }
  61   VERIFY( i == times );
  62 }
  63
  64 // fstream
  65 // libstdc++/2346
  66 void test02()
  67 {
  68   std::wfstream ofstrm;
  69   ofstrm.open("wistream_seeks-3.txt", std::wios::out);
  70   if (!ofstrm)
  71     std::abort();
  72   write_rewind(ofstrm);
  73   ofstrm.close();
  74
  75   std::wfstream ifstrm;
  76   ifstrm.open("wistream_seeks-3.txt", std::wios::in);
  77   check_contents(ifstrm);
  78   ifstrm.close();
  79 }
  80
  81 int main()
  82 {
  83   test02();
  84   return 0;
  85 }