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[] = "seekpos-2io.tst"; // file with data in it
31
32void test05()
33{
34  using namespace std;
35  using namespace __gnu_test;
36
37  typedef filebuf::int_type 	int_type;
38  typedef filebuf::pos_type 	pos_type;
39  typedef filebuf::off_type 	off_type;
40
41  bool test __attribute__((unused)) = true;
42
43  int_type c1;
44  int_type c2;
45  int_type c3;
46
47  pos_type pt_1(off_type(-1));
48  pos_type pt_2(off_type(0));
49  pos_type pt_3;
50  off_type off_1 = 0;
51  off_type off_2 = 0;
52
53  // seekpos
54  // pubseekpos(pos_type sp, ios_base::openmode)
55  // alters the stream position to sp
56
57  // in | out
58  {
59    constraint_filebuf fb;
60    fb.pubsetbuf(0, 0);
61    fb.open(name_01, ios_base::out | ios_base::in);
62    VERIFY( fb.unbuffered() );
63
64    // beg
65    pt_1 = fb.pubseekoff(78, ios_base::beg);
66    off_1 = off_type(pt_1);
67    VERIFY( off_1 > 0 );
68    c1 = fb.snextc(); //current in pointer +1
69    VERIFY( c1 == 't' );
70
71    // cur
72    pt_3 = fb.pubseekoff(0, ios_base::cur);
73    fb.pubseekpos(pt_3);
74    c2 = fb.sputc('\n'); //test current out pointer
75    pt_3 = fb.pubseekoff(0, ios_base::cur);
76    fb.pubseekpos(pt_3);
77    c3 = fb.sgetc();
78    fb.pubsync(); //resets pointers
79    pt_2 = fb.pubseekpos(pt_1);
80    off_2 = off_type(pt_2);
81    VERIFY( off_1 == off_2 );
82    c3 = fb.snextc(); //current in pointer +1
83    VERIFY( c2 == c3 );
84
85    // end
86    pt_1 = fb.pubseekoff(0, ios_base::end);
87    off_1 = off_type(pt_1);
88    VERIFY( off_1 > off_2 );
89    fb.sputn("\nof the wonderful things he does!!\nok", 37);
90    fb.pubsync();
91    VERIFY( fb.unbuffered() );
92    fb.close();
93    VERIFY( !fb.is_open() );
94  }
95}
96
97int main()
98{
99  test05();
100  return 0;
101}
102