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