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[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 27_io / basic_filebuf / seekoff / wchar_t / 4.cc
1 // { dg-require-fileio "" }
2
3 // Copyright (C) 2010-2020 Free Software Foundation, Inc.
4 //
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)
9 // any later version.
10
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.
15
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/>.
19
20 // 27.8.1.4 Overridden virtual functions
21
22 #include <fstream>
23 #include <cwchar>
24 #include <cstring>
25 #include <testsuite_hooks.h>
26
27 void test01()
28 {
29 using namespace std;
30
31 typedef wfilebuf::pos_type pos_type;
32 const char name[] = "tmp_seekoff-4.tst";
33
34 const size_t size = 12;
35 wchar_t buf[size];
36 streamsize n;
37
38 wfilebuf fb;
39 fb.open(name, ios_base::in | ios_base::out | ios_base::trunc);
40
41 n = fb.sputn(L"abcd", 4);
42 VERIFY( n == 4 );
43
44 fb.pubseekoff(0, ios_base::beg);
45 n = fb.sgetn(buf, 3);
46 VERIFY( n == 3 );
47 VERIFY( !wmemcmp(buf, L"abc", 3) );
48
49 // Check read => write without pubseekoff(0, ios_base::cur)
50
51 n = fb.sputn(L"ef", 2);
52 VERIFY( n == 2 );
53
54 fb.pubseekoff(0, ios_base::beg);
55
56 n = fb.sgetn(buf, size);
57 VERIFY( n == 5 );
58 VERIFY( !wmemcmp(buf, L"abcef", 5) );
59
60 fb.pubseekoff(0, ios_base::beg);
61 n = fb.sputn(L"gh", 2);
62 VERIFY( n == 2 );
63
64 // Check write => read without pubseekoff(0, ios_base::cur)
65
66 n = fb.sgetn( buf, 3 );
67 VERIFY( !memcmp(buf, L"cef", 3) );
68
69 n = fb.sputn(L"ijkl", 4);
70 VERIFY( n == 4 );
71
72 fb.pubseekoff(0, ios_base::beg);
73 n = fb.sgetn(buf, 2);
74 VERIFY( n == 2 );
75 VERIFY( !wmemcmp(buf, L"gh", 2) );
76
77 fb.pubseekoff(0, ios_base::end);
78 n = fb.sputn(L"mno", 3);
79 VERIFY( n == 3 );
80
81 fb.pubseekoff(0, ios_base::beg);
82 n = fb.sgetn(buf, size);
83 VERIFY( n == 12 );
84 VERIFY( !wmemcmp(buf, L"ghcefijklmno", 12) );
85
86 fb.close();
87 }
88
89 int main()
90 {
91 test01();
92 return 0;
93 }