1 // 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
3 // Copyright (C) 2001-2013 Free Software Foundation, Inc.
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)
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.
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/>.
20 // 27.8.1.4 Overridden virtual functions
22 // { dg-require-fileio "" }
25 #include <testsuite_hooks.h>
27 // @require@ %-*.tst %-*.txt
28 // @diff@ %-*.tst %*.txt
30 // NB: This test assumes that _M_buf_size == 40, and not the usual
31 // buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
32 // simulated a bit more readily.
33 // NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
34 const int buffer_size = 8192;
35 //const int buffer_size = 40;
37 const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
38 const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
39 const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
41 class derived_filebuf: public std::filebuf
45 set_size(int_type __size) { _M_buf_size = __size; }
48 derived_filebuf fb_01; // in
49 derived_filebuf fb_02; // out
50 derived_filebuf fb_03; // in | out
52 // Initialize filebufs to be the same size regardless of platform.
55 fb_01.set_size(buffer_size);
56 fb_02.set_size(buffer_size);
57 fb_03.set_size(buffer_size);
60 // Test overloaded virtual functions.
63 typedef std::filebuf::int_type int_type;
64 typedef std::filebuf::traits_type traits_type;
65 typedef std::filebuf::pos_type pos_type;
66 typedef std::filebuf::off_type off_type;
67 typedef size_t size_type;
69 bool test __attribute__((unused)) = true;
71 std::streamoff strmof_1, strmof_2;
75 // if a read position is available, return _M_in_end - _M_in_cur.
76 // else return showmanyc.
77 strmof_1 = fb_01.in_avail();
78 strmof_2 = fb_02.in_avail();
79 VERIFY( strmof_1 == -1 );
80 VERIFY( strmof_1 == strmof_2 ); //fail because not open
81 strmof_1 = fb_03.in_avail();
82 VERIFY( strmof_1 == strmof_2 );
83 fb_01.open(name_01, std::ios_base::in);
84 fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
85 fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc);
86 strmof_1 = fb_01.in_avail();
87 strmof_2 = fb_02.in_avail();
88 VERIFY( strmof_1 != strmof_2 );
89 VERIFY( strmof_1 >= 0 );
90 VERIFY( strmof_2 == -1 ); // empty file
91 strmof_1 = fb_03.in_avail();
92 VERIFY( strmof_1 == 0 ); // empty file