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

   1 // 2000-06-29 bkoz
   2
   3 // Copyright (C) 2000-2024 Free Software Foundation, Inc.
   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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 27.6.2.4  basic_ostream seek members  [lib.ostream.seeks]
  21 // @require@ %-*.tst %-*.txt
  22 // @diff@ %-*.tst %-*.txt
  23
  24 // { dg-require-fileio "" }
  25
  26 #include <ostream>
  27 #include <istream>
  28 #include <fstream>
  29 #include <cstdlib>
  30 #include <testsuite_hooks.h>
  31
  32 const char* s = " lootpack, peanut butter wolf, rob swift, madlib, quasimoto";
  33 const int times = 10;
  34
  35 void write_rewind(std::iostream& stream)
  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   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 // fstream
  67 // libstdc++/2346
  68 void test02()
  69 {
  70   std::fstream ofstrm;
  71   ofstrm.open("istream_seeks-3.txt", std::ios::out);
  72   if (!ofstrm)
  73     std::abort();
  74   write_rewind(ofstrm);
  75   ofstrm.close();
  76
  77   std::fstream ifstrm;
  78   ifstrm.open("istream_seeks-3.txt", std::ios::in);
  79   check_contents(ifstrm);
  80   ifstrm.close();
  81 }
  82
  83 int main()
  84 {
  85   test02();
  86   return 0;
  87 }