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

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001-2018 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 // 27.8.1.4 Overridden virtual functions
  21
  22 // { dg-require-fileio "" }
  23
  24 #include <fstream>
  25 #include <testsuite_hooks.h>
  26
  27 const char name_08[] = "filebuf_virtuals-8.txt"; // empty file, need to create
  28
  29 class OverBuf : public std::filebuf
  30 {
  31 public:
  32   int_type pub_overflow(int_type c = traits_type::eof())
  33   { return std::filebuf::overflow(c); }
  34 };
  35
  36 // libstdc++/9988
  37 // filebuf::overflow writes EOF to file
  38 void test15()
  39 {
  40   using namespace std;
  41
  42   OverBuf fb;
  43   fb.open(name_08, ios_base::out | ios_base::trunc);
  44
  45   fb.sputc('a');
  46   fb.pub_overflow('b');
  47   fb.pub_overflow();
  48   fb.sputc('c');
  49   fb.close();
  50
  51   filebuf fbin;
  52   fbin.open(name_08, ios_base::in);
  53   filebuf::int_type c;
  54   c = fbin.sbumpc();
  55   VERIFY( c == 'a' );
  56   c = fbin.sbumpc();
  57   VERIFY( c == 'b' );
  58   c = fbin.sbumpc();
  59   VERIFY( c == 'c' );
  60   c = fbin.sbumpc();
  61   VERIFY( c == filebuf::traits_type::eof() );
  62   fbin.close();
  63 }
  64
  65 int main()
  66 {
  67   test15();
  68   return 0;
  69 }