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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/27_io/basic_filebuf/sungetc/char/1-io.cc
1 // 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
3 // Copyright (C) 2001-2019 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>
26 #include <testsuite_io.h>
28 // @require@ %-*.tst %-*.txt
29 // @diff@ %-*.tst %*.txt
31 const char name_01
[] = "tmp_sungetc_1io.tst"; // empty file, need to create
36 using namespace __gnu_test
;
38 typedef filebuf::int_type int_type
;
39 typedef filebuf::traits_type traits_type
;
40 typedef size_t size_type
;
42 streamsize strmsz_1
, strmsz_2
;
46 // if in_cur not avail, return pbackfail(), else decrement and
47 // return to_int_type(*gptr())
51 constraint_filebuf fb_01
;
52 fb_01
.open(name_01
, ios_base::out
| ios_base::in
| ios_base::trunc
);
53 VERIFY( !fb_01
.write_position() );
54 VERIFY( !fb_01
.read_position() );
57 fb_01
.pubseekoff(-1, std::ios_base::end
);
59 strmsz_1
= fb_01
.in_avail();
61 strmsz_2
= fb_01
.in_avail();
62 VERIFY( c2
== 'v' ); // VERIFY( c2 != traits_type::eof() );
63 VERIFY( strmsz_1
+ 1 == strmsz_2
);
64 //test for _in_cur == _in_end
65 fb_01
.pubseekoff(0, std::ios_base::end
);
66 strmsz_1
= fb_01
.in_avail(); // -1 cuz at the end
69 strmsz_2
= fb_01
.in_avail(); // 1
72 VERIFY( strmsz_2
!= strmsz_1
);
73 VERIFY( strmsz_2
== 1 );
74 VERIFY( !fb_01
.write_position() );
75 VERIFY( fb_01
.read_position() );