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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
// Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// 27.8.1.4 Overridden virtual functions
#include <fstream>
#include <testsuite_hooks.h>
// @require@ %-*.tst %-*.txt
// @diff@ %-*.tst %*.txt
// NB: This test assumes that _M_buf_size == 40, and not the usual
// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
// simulated a bit more readily.
// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
const int buffer_size = 8192;
//const int buffer_size = 40;
const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
class derived_filebuf: public std::filebuf
{
public:
void
set_size(int_type __size) { _M_buf_size = __size; }
};
derived_filebuf fb_03; // in | out
// Initialize filebufs to be the same size regardless of platform.
void test03()
{
fb_03.set_size(buffer_size);
}
// Test overloaded virtual functions.
void test05()
{
using namespace std;
typedef filebuf::int_type int_type;
typedef filebuf::traits_type traits_type;
typedef filebuf::pos_type pos_type;
typedef filebuf::off_type off_type;
typedef size_t size_type;
bool test = true;
filebuf f_tmp;
streamsize strmsz_1, strmsz_2;
streamoff strmof_1, strmof_2;
int i = 0, j = 0, k = 0;
fb_03.open(name_01, ios_base::out | ios_base::in);
int_type c1;
int_type c2;
int_type c3;
// seekpos
// pubseekpos(pos_type sp, ios_base::openmode)
// alters the stream position to sp
pos_type pt_1(off_type(-1));
pos_type pt_2(off_type(0));
off_type off_1 = 0;
off_type off_2 = 0;
//IN|OUT
//beg
pt_1 = fb_03.pubseekoff(78, ios_base::beg);
off_1 = pt_1;
VERIFY( off_1 > 0 );
c1 = fb_03.snextc(); //current in pointer +1
VERIFY( c1 == 't' );
c2 = fb_03.sputc('\n'); //test current out pointer
c3 = fb_03.sgetc();
fb_03.pubsync(); //resets pointers
pt_2 = fb_03.pubseekpos(pt_1);
off_2 = pt_2;
VERIFY( off_1 == off_2 );
c3 = fb_03.snextc(); //current in pointer +1
VERIFY( c2 == c3 );
pt_1 = fb_03.pubseekoff(0, ios_base::end);
off_1 = pt_1;
VERIFY( off_1 > off_2 );
fb_03.sputn("\nof the wonderful things he does!!\nok", 37);
fb_03.pubsync();
// IN
// OUT
// VIRTUALS (indirectly tested)
// underflow
// if read position avail, returns *gptr()
// pbackfail(int_type c)
// put c back into input sequence
// overflow
// appends c to output seq
// NB Have to close these suckers. . .
// filebuf_type* close()
fb_03.close();
VERIFY( !fb_03.is_open() );
}
main()
{
test03();
test05();
return 0;
}
|
