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-2io.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
42  bool test __attribute__((unused)) = true;
43
44  int_type c1;
45  int_type c2;
46  int_type c3;
47
48  pos_type pt_1(off_type(-1));
49  pos_type pt_2(off_type(0));
50  pos_type pt_3;
51  off_type off_1 = 0;
52  off_type off_2 = 0;
53
54  // seekpos
55  // pubseekpos(pos_type sp, ios_base::openmode)
56  // alters the stream position to sp
57
58  // in | out
59  {
60    constraint_filebuf fb;
61    fb.pubsetbuf(0, 0);
62    fb.open(name_01, ios_base::out | ios_base::in);
63    VERIFY( fb.unbuffered() );
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 == c3 );
85
86    // end
87    pt_1 = fb.pubseekoff(0, ios_base::end);
88    off_1 = off_type(pt_1);
89    VERIFY( off_1 > off_2 );
90    fb.sputn("\nof the wonderful things he does!!\nok", 37);
91    fb.pubsync();
92    VERIFY( fb.unbuffered() );
93    fb.close();
94    VERIFY( !fb.is_open() );
95  }
96}
97
98int main()
99{
100  test05();
101  return 0;
102}
103