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[] = "seekoff.txt";
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  streamsize 			strmsz_1, strmsz_2;
45
46  int_type c1;
47  int_type c2;
48  int_type c3;
49
50  pos_type pt_1(off_type(-1));
51  pos_type pt_2(off_type(0));
52  off_type off_1 = 0;
53  off_type off_2 = 0;
54
55  // seekoff
56  // pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which)
57  // alters the stream position to off
58
59  // in
60  {
61    constraint_filebuf fb;
62    fb.pubsetbuf(0, 0);
63    fb.open(name_01, ios_base::in);
64    VERIFY( fb.unbuffered() );
65
66    //beg
67    strmsz_1 = fb.in_avail();
68    pt_1 = fb.pubseekoff(2, ios_base::beg);
69    strmsz_2 = fb.in_avail();
70    off_1 = off_type(pt_1);
71    VERIFY( off_1 > 0 );
72    c1 = fb.snextc(); //current in pointer +1
73    VERIFY( c1 == '9' );
74    fb.pubseekoff(3, ios_base::beg);
75    c2 = fb.sputc('\n');  //current in pointer +1
76    fb.pubseekoff(4, ios_base::beg);
77    c3 = fb.sgetc();
78    VERIFY( c2 == traits_type::eof() );
79    VERIFY( c3 == '9' );
80    fb.pubsync();
81    c1 = fb.sgetc();
82    VERIFY( c1 == c3 );
83
84    //cur
85    pt_2 = fb.pubseekoff(2, ios_base::cur);
86    off_2 = off_type(pt_2);
87    VERIFY( (off_2 == (off_1 + 2 + 1 + 1)) );
88    c1 = fb.snextc(); //current in pointer +1
89    VERIFY( c1 == '1' );
90    fb.pubseekoff(0, ios_base::cur);
91    c2 = fb.sputc('x');  //test current out pointer
92    c3 = fb.sputc('\n');
93    VERIFY( c2 == traits_type::eof() );
94    VERIFY( c3 == traits_type::eof() );
95    fb.pubseekoff(0, ios_base::cur);
96    c1 = fb.sgetc();
97    fb.pubsync();
98    c3 = fb.sgetc();
99    VERIFY( c1 == c3 );
100
101    //end
102    pt_2 = fb.pubseekoff(0, ios_base::end);
103    off_1 = off_type(pt_2);
104    VERIFY( off_1 > off_2 ); //weak, but don't know exactly where it ends
105    c3 = fb.sputc('\n');
106    strmsz_1 = fb.sputn("because because because. . .", 28);
107    VERIFY( strmsz_1 == 0 );
108    fb.pubseekoff(-1, ios_base::end);
109    fb.sgetc();
110    c1 = fb.sungetc();
111    // Defect?  retval of sungetc is not necessarily the character ungotten.
112    // So re-get it.
113    c1 = fb.sgetc();
114    fb.pubsync();
115    c3 = fb.sgetc();
116    VERIFY( c1 == c3 );
117    VERIFY( fb.unbuffered() );
118  }
119}
120
121int main()
122{
123  test05();
124  return 0;
125}
126