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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/27_io/basic_filebuf/sbumpc/char/1.cc
1 // 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
3 // Copyright (C) 2001, 2002, 2003 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 2, 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 COPYING. If not, write to the Free
18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21 // 27.8.1.4 Overridden virtual functions
24 #include <testsuite_hooks.h>
26 // @require@ %-*.tst %-*.txt
27 // @diff@ %-*.tst %*.txt
29 // NB: This test assumes that _M_buf_size == 40, and not the usual
30 // buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
31 // simulated a bit more readily.
32 // NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
33 const int buffer_size
= 8192;
34 //const int buffer_size = 40;
36 const char name_01
[] = "filebuf_virtuals-1.txt"; // file with data in it
37 const char name_02
[] = "filebuf_virtuals-2.txt"; // empty file, need to create
38 const char name_03
[] = "filebuf_virtuals-3.txt"; // empty file, need to create
40 class derived_filebuf
: public std::filebuf
44 set_size(int_type __size
) { _M_buf_size_opt
= __size
; }
47 derived_filebuf fb_01
; // in
48 derived_filebuf fb_02
; // out
49 derived_filebuf fb_03
; // in | out
51 // Initialize filebufs to be the same size regardless of platform.
54 fb_01
.set_size(buffer_size
);
55 fb_02
.set_size(buffer_size
);
56 fb_03
.set_size(buffer_size
);
59 // Test overloaded virtual functions.
63 typedef filebuf::int_type int_type
;
64 typedef filebuf::traits_type traits_type
;
65 typedef filebuf::pos_type pos_type
;
66 typedef filebuf::off_type off_type
;
67 typedef size_t size_type
;
71 streamsize strmsz_1
, strmsz_2
;
72 streamoff strmof_1
, strmof_2
;
73 int i
= 0, j
= 0, k
= 0;
76 fb_01
.open(name_01
, ios_base::in
);
77 fb_02
.open(name_02
, ios_base::out
| ios_base::trunc
);
78 fb_03
.open(name_03
, ios_base::out
| ios_base::in
| ios_base::trunc
);
79 strmof_1
= fb_01
.in_avail();
80 strmof_2
= fb_02
.in_avail();
81 strmof_1
= fb_03
.in_avail();
84 // if read_cur not avail returns uflow(), else return *read_cur & increment
85 int_type c1
= fb_01
.sbumpc();
86 int_type c2
= fb_02
.sbumpc();
90 int_type c3
= fb_01
.sbumpc();
91 int_type c4
= fb_02
.sbumpc();
93 VERIFY( c1
== c3
); // fluke, both happen to be '/'
95 int_type c5
= fb_03
.sbumpc();
96 VERIFY( c5
== traits_type::eof() );
97 // XXX should do some kind of test to make sure that internal
98 // buffers point to the same thing, to check consistancy.