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 // <streambuf>
10 
11 // template <class charT, class traits = char_traits<charT> >
12 // class basic_streambuf;
13 
14 // int_type sputc(char_type c);
15 
16 #include <streambuf>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 
21 int overflow_called = 0;
22 
23 struct test
24     : public std::basic_streambuf<char>
25 {
26     typedef std::basic_streambuf<char> base;
27 
28     test() {}
29 
30     void setg(char* gbeg, char* gnext, char* gend)
31     {
32         base::setg(gbeg, gnext, gend);
33     }
34     void setp(char* pbeg, char* pend)
35     {
36         base::setp(pbeg, pend);
37     }
38 
39 protected:
40     int_type overflow(int_type = traits_type::eof())
41     {
42         ++overflow_called;
43         return 'a';
44     }
45 };
46 
47 int main(int, char**)
48 {
49     {
50         test t;
51         assert(overflow_called == 0);
52         assert(t.sputc('A') == 'a');
53         assert(overflow_called == 1);
54         char out[3] = {0};
55         t.setp(out, out+sizeof(out));
56         assert(t.sputc('A') == 'A');
57         assert(overflow_called == 1);
58         assert(out[0] == 'A');
59         assert(t.sputc('B') == 'B');
60         assert(overflow_called == 1);
61         assert(out[0] == 'A');
62         assert(out[1] == 'B');
63     }
64 
65   return 0;
66 }
67