libstdc++-v3/testsuite/27_io/basic_filebuf/overflow/char/9988.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001, 2002, 2003 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 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 27.8.1.4 Overridden virtual functions
  22
  23 // { dg-require-fileio "" }
  24
  25 #include <fstream>
  26 #include <testsuite_hooks.h>
  27
  28 const char name_08[] = "filebuf_virtuals-8.txt"; // empty file, need to create
  29
  30 class OverBuf : public std::filebuf
  31 {
  32 public:
  33   int_type pub_overflow(int_type c = traits_type::eof())
  34   { return std::filebuf::overflow(c); }
  35 };
  36
  37 // libstdc++/9988
  38 // filebuf::overflow writes EOF to file
  39 void test15()
  40 {
  41   using namespace std;
  42   bool test __attribute__((unused)) = true;
  43
  44   OverBuf fb;
  45   fb.open(name_08, ios_base::out | ios_base::trunc);
  46
  47   fb.sputc('a');
  48   fb.pub_overflow('b');
  49   fb.pub_overflow();
  50   fb.sputc('c');
  51   fb.close();
  52
  53   filebuf fbin;
  54   fbin.open(name_08, ios_base::in);
  55   filebuf::int_type c;
  56   c = fbin.sbumpc();
  57   VERIFY( c == 'a' );
  58   c = fbin.sbumpc();
  59   VERIFY( c == 'b' );
  60   c = fbin.sbumpc();
  61   VERIFY( c == 'c' );
  62   c = fbin.sbumpc();
  63   VERIFY( c == filebuf::traits_type::eof() );
  64   fbin.close();
  65 }
  66
  67 int main()
  68 {
  69   test15();
  70   return 0;
  71 }