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 // <sstream>
10 
11 // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
12 // class basic_stringbuf
13 
14 // pos_type seekpos(pos_type sp,
15 //                  ios_base::openmode which = ios_base::in | ios_base::out);
16 
17 #include <sstream>
18 #include <cassert>
19 
20 #include "test_macros.h"
21 
22 int main(int, char**)
23 {
24     {
25         std::stringbuf sb("0123456789", std::ios_base::in);
26         assert(sb.pubseekpos(3, std::ios_base::out) == -1);
27         assert(sb.pubseekpos(3, std::ios_base::in | std::ios_base::out) == -1);
28         assert(sb.pubseekpos(3, std::ios_base::in) == 3);
29         assert(sb.sgetc() == '3');
30     }
31     {
32         std::stringbuf sb("0123456789", std::ios_base::out);
33         assert(sb.pubseekpos(3, std::ios_base::in) == -1);
34         assert(sb.pubseekpos(3, std::ios_base::out | std::ios_base::in) == -1);
35         assert(sb.pubseekpos(3, std::ios_base::out) == 3);
36         assert(sb.sputc('a') == 'a');
37         assert(sb.str() == "012a456789");
38     }
39     {
40         std::stringbuf sb("0123456789");
41         assert(sb.pubseekpos(3, std::ios_base::in) == 3);
42         assert(sb.sgetc() == '3');
43         assert(sb.pubseekpos(3, std::ios_base::out | std::ios_base::in) == 3);
44         assert(sb.sgetc() == '3');
45         assert(sb.sputc('a') == 'a');
46         assert(sb.str() == "012a456789");
47         assert(sb.pubseekpos(3, std::ios_base::out) == 3);
48         assert(sb.sputc('3') == '3');
49         assert(sb.str() == "0123456789");
50     }
51     {
52         std::wstringbuf sb(L"0123456789", std::ios_base::in);
53         assert(sb.pubseekpos(3, std::ios_base::out) == -1);
54         assert(sb.pubseekpos(3, std::ios_base::in | std::ios_base::out) == -1);
55         assert(sb.pubseekpos(3, std::ios_base::in) == 3);
56         assert(sb.sgetc() == L'3');
57     }
58     {
59         std::wstringbuf sb(L"0123456789", std::ios_base::out);
60         assert(sb.pubseekpos(3, std::ios_base::in) == -1);
61         assert(sb.pubseekpos(3, std::ios_base::out | std::ios_base::in) == -1);
62         assert(sb.pubseekpos(3, std::ios_base::out) == 3);
63         assert(sb.sputc(L'a') == L'a');
64         assert(sb.str() == L"012a456789");
65     }
66     {
67         std::wstringbuf sb(L"0123456789");
68         assert(sb.pubseekpos(3, std::ios_base::in) == 3);
69         assert(sb.sgetc() == L'3');
70         assert(sb.pubseekpos(3, std::ios_base::out | std::ios_base::in) == 3);
71         assert(sb.sgetc() == L'3');
72         assert(sb.sputc(L'a') == L'a');
73         assert(sb.str() == L"012a456789");
74         assert(sb.pubseekpos(3, std::ios_base::out) == 3);
75         assert(sb.sputc(L'3') == L'3');
76         assert(sb.str() == L"0123456789");
77     }
78 
79   return 0;
80 }
81