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[] = "seekoff.txt";
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  typedef filebuf::traits_type 	traits_type;
41
42  bool test __attribute__((unused)) = true;
43  streamsize 			strmsz_1, strmsz_2;
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  off_type off_1 = 0;
52  off_type off_2 = 0;
53
54  // seekoff
55  // pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which)
56  // alters the stream position to off
57
58  // in
59  {
60    constraint_filebuf fb;
61    fb.pubsetbuf(0, 0);
62    fb.open(name_01, ios_base::in);
63    VERIFY( fb.unbuffered() );
64
65    //beg
66    strmsz_1 = fb.in_avail();
67    pt_1 = fb.pubseekoff(2, ios_base::beg);
68    strmsz_2 = fb.in_avail();
69    off_1 = off_type(pt_1);
70    VERIFY( off_1 > 0 );
71    c1 = fb.snextc(); //current in pointer +1
72    VERIFY( c1 == '9' );
73    fb.pubseekoff(3, ios_base::beg);
74    c2 = fb.sputc('\n');  //current in pointer +1
75    fb.pubseekoff(4, ios_base::beg);
76    c3 = fb.sgetc();
77    VERIFY( c2 == traits_type::eof() );
78    VERIFY( c3 == '9' );
79    fb.pubsync();
80    c1 = fb.sgetc();
81    VERIFY( c1 == c3 );
82
83    //cur
84    pt_2 = fb.pubseekoff(2, ios_base::cur);
85    off_2 = off_type(pt_2);
86    VERIFY( (off_2 == (off_1 + 2 + 1 + 1)) );
87    c1 = fb.snextc(); //current in pointer +1
88    VERIFY( c1 == '1' );
89    fb.pubseekoff(0, ios_base::cur);
90    c2 = fb.sputc('x');  //test current out pointer
91    c3 = fb.sputc('\n');
92    VERIFY( c2 == traits_type::eof() );
93    VERIFY( c3 == traits_type::eof() );
94    fb.pubseekoff(0, ios_base::cur);
95    c1 = fb.sgetc();
96    fb.pubsync();
97    c3 = fb.sgetc();
98    VERIFY( c1 == c3 );
99
100    //end
101    pt_2 = fb.pubseekoff(0, ios_base::end);
102    off_1 = off_type(pt_2);
103    VERIFY( off_1 > off_2 ); //weak, but don't know exactly where it ends
104    c3 = fb.sputc('\n');
105    strmsz_1 = fb.sputn("because because because. . .", 28);
106    VERIFY( strmsz_1 == 0 );
107    fb.pubseekoff(-1, ios_base::end);
108    fb.sgetc();
109    c1 = fb.sungetc();
110    // Defect?  retval of sungetc is not necessarily the character ungotten.
111    // So re-get it.
112    c1 = fb.sgetc();
113    fb.pubsync();
114    c3 = fb.sgetc();
115    VERIFY( c1 == c3 );
116    VERIFY( fb.unbuffered() );
117  }
118}
119
120int main()
121{
122  test05();
123  return 0;
124}
125