libstdc++-v3/testsuite/27_io/basic_filebuf/in_avail/char/9701-3.cc

   1 // Copyright (C) 2003-2015 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 // 27.5.2.2.3 Get area
  19
  20 // { dg-require-fileio "" }
  21
  22 #include <fstream>
  23 #include <testsuite_hooks.h>
  24
  25 class Derived_fbuf : public std::filebuf
  26 {
  27 public:
  28   const char_type* pub_egptr() const
  29   { return egptr(); }
  30
  31   const char_type* pub_gptr() const
  32   { return gptr(); }
  33 };
  34
  35 // libstdc++/9701 (in_avail)
  36 void test01()
  37 {
  38   using namespace std;
  39   bool test __attribute__((unused)) = true;
  40   const char* name = "tmp_file1";
  41
  42   Derived_fbuf df2;
  43   df2.open(name, ios_base::in | ios_base::out | ios_base::trunc);
  44
  45   df2.sputn("Comomoc", 7);
  46
  47   df2.pubseekoff(0, ios_base::beg);
  48   df2.sbumpc();
  49   df2.sputbackc('t');
  50
  51   VERIFY( df2.pub_gptr() < df2.pub_egptr() );
  52   VERIFY( df2.in_avail() == df2.pub_egptr() - df2.pub_gptr() );
  53 }
  54
  55 int
  56 main()
  57 {
  58   test01();
  59   return 0;
  60 }