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 // <streambuf>
11 
12 // template <class charT, class traits = char_traits<charT> >
13 // class basic_streambuf;
14 
15 // int_type sputc(char_type c);
16 
17 #include <streambuf>
18 #include <cassert>
19 
20 int overflow_called = 0;
21 
22 struct test
23     : public std::basic_streambuf<char>
24 {
25     typedef std::basic_streambuf<char> base;
26 
testtest27     test() {}
28 
setgtest29     void setg(char* gbeg, char* gnext, char* gend)
30     {
31         base::setg(gbeg, gnext, gend);
32     }
setptest33     void setp(char* pbeg, char* pend)
34     {
35         base::setp(pbeg, pend);
36     }
37 
38 protected:
overflowtest39     int_type overflow(int_type c = traits_type::eof())
40     {
41         ++overflow_called;
42         return 'a';
43     }
44 };
45 
main()46 int main()
47 {
48     {
49         test t;
50         assert(overflow_called == 0);
51         assert(t.sputc('A') == 'a');
52         assert(overflow_called == 1);
53         char out[3] = {0};
54         t.setp(out, out+sizeof(out));
55         assert(t.sputc('A') == 'A');
56         assert(overflow_called == 1);
57         assert(out[0] == 'A');
58         assert(t.sputc('B') == 'B');
59         assert(overflow_called == 1);
60         assert(out[0] == 'A');
61         assert(out[1] == 'B');
62     }
63 }
64