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.txt"; // 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  // in
60  {
61    constraint_filebuf fb;
62    fb.open(name_01, ios_base::in);
63    VERIFY( !fb.write_position() );
64
65    // beg
66    pt_1 = fb.pubseekoff(78, ios_base::beg);
67    off_1 = off_type(pt_1);
68    VERIFY( off_1 > 0 );
69    c1 = fb.snextc(); //current in pointer +1
70    VERIFY( c1 == 't' );
71
72    // cur
73    pt_3 = fb.pubseekoff(0, ios_base::cur);
74    fb.pubseekpos(pt_3);
75    c2 = fb.sputc('\n'); //test current out pointer
76    pt_3 = fb.pubseekoff(0, ios_base::cur);
77    fb.pubseekpos(pt_3);
78    c3 = fb.sgetc();
79    fb.pubsync(); //resets pointers
80    pt_2 = fb.pubseekpos(pt_1);
81    off_2 = off_type(pt_2);
82    VERIFY( off_1 == off_2 );
83    c3 = fb.snextc(); //current in pointer +1
84    VERIFY( c2 == traits_type::eof() );
85    VERIFY( c2 != c3 );
86
87    // end
88    pt_1 = fb.pubseekoff(0, ios_base::end);
89    off_1 = off_type(pt_1);
90    VERIFY( off_1 > off_2 );
91    fb.sputn("\nof the wonderful things he does!!\nok", 37);
92    fb.pubsync();
93    VERIFY( !fb.write_position() );
94    fb.close();
95    VERIFY( !fb.is_open() );
96  }
97}
98
99int main()
100{
101  test05();
102  return 0;
103}
104