1// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
2
3// Copyright (C) 2001, 2002, 2003, 2009 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
31const char name_01[] = "seekpos-2out.tst"; // file with data in it
32
33void test05()
34{
35  using namespace std;
36  using namespace __gnu_test;
37
38  typedef filebuf::int_type 	int_type;
39  typedef filebuf::pos_type 	pos_type;
40  typedef filebuf::off_type 	off_type;
41  typedef filebuf::traits_type 	traits_type;
42
43  bool test __attribute__((unused)) = true;
44
45  int_type c1;
46  int_type c2;
47  int_type c3;
48
49  pos_type pt_1(off_type(-1));
50  pos_type pt_2(off_type(0));
51  pos_type pt_3;
52  off_type off_1 = 0;
53  off_type off_2 = 0;
54
55  // seekpos
56  // pubseekpos(pos_type sp, ios_base::openmode)
57  // alters the stream position to sp
58
59  // out
60  {
61    constraint_filebuf fb;
62    fb.pubsetbuf(0, 0);
63    fb.open(name_01, ios_base::out);
64    VERIFY( fb.unbuffered() );
65
66    // beg
67    pt_1 = fb.pubseekoff(78, ios_base::beg);
68    off_1 = off_type(pt_1);
69    VERIFY( off_1 > 0 );
70    c1 = fb.snextc(); //current in pointer +1
71    VERIFY( c1 == traits_type::eof() );
72
73    // cur
74    pt_3 = fb.pubseekoff(0, ios_base::cur);
75    fb.pubseekpos(pt_3);
76    c2 = fb.sputc('\n'); //test current out pointer
77    pt_3 = fb.pubseekoff(0, ios_base::cur);
78    fb.pubseekpos(pt_3);
79    c3 = fb.sgetc();
80    fb.pubsync(); //resets pointers
81    pt_2 = fb.pubseekpos(pt_1);
82    off_2 = off_type(pt_2);
83    VERIFY( off_1 == off_2 );
84    c3 = fb.snextc(); //current in pointer +1
85    VERIFY( c2 != c3 );
86    VERIFY( c3 == traits_type::eof() );
87
88    // end
89    pt_1 = fb.pubseekoff(0, ios_base::end);
90    off_1 = off_type(pt_1);
91    VERIFY( off_1 > off_2 );
92    fb.sputn("\nof the wonderful things he does!!\nok", 37);
93    fb.pubsync();
94    VERIFY( fb.unbuffered() );
95    fb.close();
96    VERIFY( !fb.is_open() );
97  }
98}
99
100int main()
101{
102  test05();
103  return 0;
104}
105