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
26 class test_codecvt
27 : public std::codecvt<wchar_t, char, std::mbstate_t>
28 {
29 typedef std::codecvt<wchar_t, char, std::mbstate_t> base;
30 public:
test_codecvt(std::size_t refs=0)31 explicit test_codecvt(std::size_t refs = 0) : base(refs) {}
~test_codecvt()32 ~test_codecvt() {}
33 };
34
main()35 int 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