1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
// { dg-require-fileio "" }
// Copyright (C) 2010 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// 27.8.1.4 Overridden virtual functions
#include <fstream>
#include <cstring>
#include <testsuite_hooks.h>
void test01()
{
using namespace std;
bool test __attribute__((unused)) = true;
typedef filebuf::pos_type pos_type;
const char name[] = "tmp_seekoff-4.tst";
const size_t size = 12;
char buf[size];
streamsize n;
filebuf fb;
fb.open(name, ios_base::in | ios_base::out | ios_base::trunc);
n = fb.sputn("abcd", 4);
VERIFY( n == 4 );
fb.pubseekoff(0, ios_base::beg);
n = fb.sgetn(buf, 3);
VERIFY( n == 3 );
VERIFY( !memcmp(buf, "abc", 3) );
// Check read => write without pubseekoff(0, ios_base::cur)
n = fb.sputn("ef", 2);
VERIFY( n == 2 );
fb.pubseekoff(0, ios_base::beg);
n = fb.sgetn(buf, size);
VERIFY( n == 5 );
VERIFY( !memcmp(buf, "abcef", 5) );
fb.pubseekoff(0, ios_base::beg);
n = fb.sputn("gh", 2);
VERIFY( n == 2 );
// Check write => read without pubseekoff(0, ios_base::cur)
n = fb.sgetn( buf, 3 );
VERIFY( !memcmp(buf, "cef", 3) );
n = fb.sputn("ijkl", 4);
VERIFY( n == 4 );
fb.pubseekoff(0, ios_base::beg);
n = fb.sgetn(buf, 2);
VERIFY( n == 2 );
VERIFY( !memcmp(buf, "gh", 2) );
fb.pubseekoff(0, ios_base::end);
n = fb.sputn("mno", 3);
VERIFY( n == 3 );
fb.pubseekoff(0, ios_base::beg);
n = fb.sgetn(buf, size);
VERIFY( n == 12 );
VERIFY( !memcmp(buf, "ghcefijklmno", 12) );
fb.close();
}
int main()
{
test01();
return 0;
}
|
