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 // XFAIL: with_system_cxx_lib=macosx10.7
11 // XFAIL: with_system_cxx_lib=macosx10.8
12
13 // <istream>
14
15 // streamsize readsome(char_type* s, streamsize n);
16
17 #include <istream>
18 #include <cassert>
19
20 template <class CharT>
21 struct testbuf
22 : public std::basic_streambuf<CharT>
23 {
24 typedef std::basic_string<CharT> string_type;
25 typedef std::basic_streambuf<CharT> base;
26 private:
27 string_type str_;
28 public:
29
testbuftestbuf30 testbuf() {}
testbuftestbuf31 testbuf(const string_type& str)
32 : str_(str)
33 {
34 base::setg(const_cast<CharT*>(str_.data()),
35 const_cast<CharT*>(str_.data()),
36 const_cast<CharT*>(str_.data()) + str_.size());
37 }
38
ebacktestbuf39 CharT* eback() const {return base::eback();}
gptrtestbuf40 CharT* gptr() const {return base::gptr();}
egptrtestbuf41 CharT* egptr() const {return base::egptr();}
42 };
43
main()44 int main()
45 {
46 {
47 testbuf<char> sb(" 1234567890");
48 std::istream is(&sb);
49 char s[5];
50 assert(is.readsome(s, 5) == 5);
51 assert(!is.eof());
52 assert(!is.fail());
53 assert(std::string(s, 5) == " 1234");
54 assert(is.gcount() == 5);
55 is.readsome(s, 5);
56 assert(!is.eof());
57 assert(!is.fail());
58 assert(std::string(s, 5) == "56789");
59 assert(is.gcount() == 5);
60 is.readsome(s, 5);
61 assert(!is.eof());
62 assert(!is.fail());
63 assert(is.gcount() == 1);
64 assert(std::string(s, 1) == "0");
65 assert(is.readsome(s, 5) == 0);
66 }
67 {
68 testbuf<wchar_t> sb(L" 1234567890");
69 std::wistream is(&sb);
70 wchar_t s[5];
71 assert(is.readsome(s, 5) == 5);
72 assert(!is.eof());
73 assert(!is.fail());
74 assert(std::wstring(s, 5) == L" 1234");
75 assert(is.gcount() == 5);
76 is.readsome(s, 5);
77 assert(!is.eof());
78 assert(!is.fail());
79 assert(std::wstring(s, 5) == L"56789");
80 assert(is.gcount() == 5);
81 is.readsome(s, 5);
82 assert(!is.eof());
83 assert(!is.fail());
84 assert(is.gcount() == 1);
85 assert(std::wstring(s, 1) == L"0");
86 assert(is.readsome(s, 5) == 0);
87 }
88 }
89