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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/27_io/basic_filebuf/sputbackc/char/2-io.cc
1 // 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
3 // Copyright (C) 2001-2020 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_sputbackc_2io.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
;
45 // int_type sputbackc(char_type c)
46 // if in_cur not avail || ! traits::eq(c, gptr() [-1]), return pbfail
47 // otherwise decrements in_cur and returns *gptr()
51 constraint_filebuf fb_01
;
52 fb_01
.pubsetbuf(0, 0);
53 fb_01
.open(name_01
, ios_base::out
| ios_base::in
| ios_base::trunc
);
54 VERIFY( fb_01
.unbuffered() );
55 strmsz_1
= fb_01
.sputn("racadabras", 10);//"abracadabras or what?"
56 strmsz_2
= fb_01
.sputn(", i wanna reach out and", 10);
57 fb_01
.pubseekoff(0, std::ios_base::cur
);
58 c1
= fb_01
.sgetc(); // -1
59 c2
= fb_01
.sputbackc('z');
60 strmsz_2
= fb_01
.in_avail();
64 VERIFY( 1 == strmsz_2
);
65 //test for _in_cur == _in_beg
66 // fb_01._M_out_beg = "bd23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZracada" etc
67 fb_01
.pubseekoff(10, std::ios_base::beg
);
69 fb_01
.pubseekoff(0, std::ios_base::cur
);
70 strmsz_1
= fb_01
.in_avail();
73 c2
= fb_01
.sputbackc('z');
74 strmsz_2
= fb_01
.in_avail();
80 // test for replacing char with identical one
82 fb_01
.pubseekoff(0, std::ios_base::cur
);
86 fb_01
.pubseekoff(0, std::ios_base::end
);
87 strmsz_1
= fb_01
.in_avail();
88 c2
= fb_01
.sputbackc('a');
89 strmsz_2
= fb_01
.in_avail();
92 VERIFY( strmsz_1
+ 1 == strmsz_2
);
93 VERIFY( fb_01
.unbuffered() );