1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <locale>
10
11// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_WSTRING_CONVERT
12
13// wbuffer_convert<Codecvt, Elem, Tr>
14
15// pos_type seekoff(off_type off, ios_base::seekdir way,
16// ios_base::openmode which = ios_base::in | ios_base::out);
17// pos_type seekpos(pos_type sp,
18// ios_base::openmode which = ios_base::in | ios_base::out);
19
20// This test is not entirely portable
21
22// XFAIL: no-wide-characters
23
24// TODO: Avoid using <fstream> in this test.
25// XFAIL: no-filesystem
26
27#include <locale>
28#include <codecvt>
29#include <fstream>
30#include <cassert>
31
32class test_codecvt
33 : public std::codecvt<wchar_t, char, std::mbstate_t>
34{
35 typedef std::codecvt<wchar_t, char, std::mbstate_t> base;
36public:
37 explicit test_codecvt(std::size_t refs = 0) : base(refs) {}
38 ~test_codecvt() {}
39};
40
41int main(int, char**)
42{
43 {
44 wchar_t buf[10];
45 typedef std::wbuffer_convert<test_codecvt> test_buf;
46 typedef test_buf::pos_type pos_type;
47 std::fstream bs("seekoff.dat", std::ios::trunc | std::ios::in
48 | std::ios::out);
49 test_buf f(bs.rdbuf());
50 f.pubsetbuf(s: buf, n: sizeof(buf)/sizeof(buf[0]));
51 f.sputn(s: L"abcdefghijklmnopqrstuvwxyz", n: 26);
52 assert(buf[0] == L'v');
53 pos_type p = f.pubseekoff(off: -15, way: std::ios_base::cur);
54 assert(p == 11);
55 assert(f.sgetc() == L'l');
56 f.pubseekoff(off: 0, way: std::ios_base::beg);
57 assert(f.sgetc() == L'a');
58 f.pubseekoff(off: -1, way: std::ios_base::end);
59 assert(f.sgetc() == L'z');
60 assert(f.pubseekpos(p) == p);
61 assert(f.sgetc() == L'l');
62 }
63 std::remove(filename: "seekoff.dat");
64
65 return 0;
66}
67

source code of libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp