1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <locale>
11
12// wbuffer_convert<Codecvt, Elem, Tr>
13
14// pos_type seekoff(off_type off, ios_base::seekdir way,
15//                  ios_base::openmode which = ios_base::in | ios_base::out);
16// pos_type seekpos(pos_type sp,
17//                  ios_base::openmode which = ios_base::in | ios_base::out);
18
19// This test is not entirely portable
20
21#include <locale>
22#include <codecvt>
23#include <fstream>
24#include <cassert>
25
26class test_codecvt
27    : public std::codecvt<wchar_t, char, std::mbstate_t>
28{
29    typedef std::codecvt<wchar_t, char, std::mbstate_t> base;
30public:
31    explicit test_codecvt(std::size_t refs = 0) : base(refs) {}
32    ~test_codecvt() {}
33};
34
35int main()
36{
37    {
38        wchar_t buf[10];
39        typedef std::wbuffer_convert<test_codecvt> test_buf;
40        typedef test_buf::pos_type pos_type;
41        std::fstream bs("seekoff.dat", std::ios::trunc | std::ios::in
42                                                       | std::ios::out);
43        test_buf f(bs.rdbuf());
44        f.pubsetbuf(buf, sizeof(buf)/sizeof(buf[0]));
45        f.sputn(L"abcdefghijklmnopqrstuvwxyz", 26);
46        assert(buf[0] == L'v');
47        pos_type p = f.pubseekoff(-15, std::ios_base::cur);
48        assert(p == 11);
49        assert(f.sgetc() == L'l');
50        f.pubseekoff(0, std::ios_base::beg);
51        assert(f.sgetc() == L'a');
52        f.pubseekoff(-1, std::ios_base::end);
53        assert(f.sgetc() == L'z');
54        assert(f.pubseekpos(p) == p);
55        assert(f.sgetc() == L'l');
56    }
57    std::remove("seekoff.dat");
58}
59