libstdc++-v3/testsuite/27_io/basic_filebuf/sputbackc/char/2-out.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001-2023 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 #include <testsuite_io.h>
  27
  28 // @require@ %-*.tst %-*.txt
  29 // @diff@ %-*.tst %*.txt
  30
  31 const char name_01[] = "tmp_sputbackc_2out.tst"; // empty file, need to create
  32
  33 // Test overloaded virtual functions.
  34 void test01()
  35 {
  36   using namespace std;
  37   using namespace __gnu_test;
  38   typedef std::filebuf::int_type        int_type;
  39   typedef filebuf::traits_type          traits_type;
  40
  41   int_type                      c1, c2;
  42
  43   // int_type sputbackc(char_type c)
  44   // if in_cur not avail || ! traits::eq(c, gptr() [-1]), return pbfail
  45   // otherwise decrements in_cur and returns *gptr()
  46
  47   // out
  48   {
  49     constraint_filebuf fb_01; // out
  50     fb_01.pubsetbuf(0, 0);
  51     fb_01.open(name_01, ios::out | ios::trunc);
  52     VERIFY( fb_01.unbuffered() );
  53     VERIFY( !fb_01.read_position() );
  54     c1 = fb_01.sgetc();
  55     VERIFY( c1 == traits_type::eof() );
  56     c2 = fb_01.sputbackc('a');
  57     VERIFY( c2 == traits_type::eof() );
  58     fb_01.sbumpc();
  59     c1 = fb_01.sbumpc();
  60     c2 = fb_01.sputbackc('a');
  61     VERIFY( c1 == c2 );
  62     VERIFY( fb_01.unbuffered() );
  63     VERIFY( !fb_01.read_position() );
  64   }
  65 }
  66
  67 int main()
  68 {
  69   test01();
  70   return 0;
  71 }