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#include <fstream>
24#include <testsuite_hooks.h>
25#include <testsuite_io.h>
26
27// @require@ %-*.tst %-*.txt
28// @diff@ %-*.tst %*.txt
29
30const char name_01[] = "tmp_sungetc_2io.tst"; // empty file, need to create
31
32void test01()
33{
34  using namespace std;
35  using namespace __gnu_test;
36
37  typedef filebuf::int_type 	int_type;
38  typedef filebuf::traits_type 	traits_type;
39  typedef size_t 		size_type;
40
41  bool test __attribute__((unused)) = true;
42  streamsize 			strmsz_1, strmsz_2;
43  int_type 			c1, c2, c3;
44
45  // int_type sungetc()
46  // if in_cur not avail, return pbackfail(), else decrement and
47  // return to_int_type(*gptr())
48
49  // in | out
50  {
51    constraint_filebuf fb_01;
52    fb_01.pubsetbuf(0, 0);
53    fb_01.open(name_01, ios_base::out | ios_base::in | ios_base::trunc);
54    VERIFY( fb_01.unbuffered() );
55    fb_01.sputc('u');
56    fb_01.sputc('v');
57    fb_01.pubseekoff(-1, std::ios_base::end);
58    c3 = fb_01.sbumpc();
59    strmsz_1 = fb_01.in_avail();
60    c2 = fb_01.sungetc();
61    strmsz_2 = fb_01.in_avail();
62    VERIFY( c2 == 'v' ); //  VERIFY( c2 != traits_type::eof() );
63    VERIFY( strmsz_1 + 1 == strmsz_2 );
64    //test for _in_cur == _in_end
65    fb_01.pubseekoff(0, std::ios_base::end);
66    strmsz_1 = fb_01.in_avail(); // -1 cuz at the end
67    c1 = fb_01.sgetc();
68    c2 = fb_01.sungetc();
69    strmsz_2 = fb_01.in_avail(); // 1
70    c3 = fb_01.sgetc();
71    VERIFY( c1 != c2 );
72    VERIFY( strmsz_2 != strmsz_1 );
73    VERIFY( strmsz_2 == 1 );
74    VERIFY( fb_01.unbuffered() );
75  }
76}
77
78int main()
79{
80  test01();
81  return 0;
82}
83