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 12 // <istream> 13 14 // basic_istream<charT,traits>& read(char_type* s, streamsize n); 15 16 #include <istream> 17 #include <cassert> 18 19 template <class CharT> 20 struct testbuf 21 : public std::basic_streambuf<CharT> 22 { 23 typedef std::basic_string<CharT> string_type; 24 typedef std::basic_streambuf<CharT> base; 25 private: 26 string_type str_; 27 public: 28 29 testbuf() {} 30 testbuf(const string_type& str) 31 : str_(str) 32 { 33 base::setg(const_cast<CharT*>(str_.data()), 34 const_cast<CharT*>(str_.data()), 35 const_cast<CharT*>(str_.data()) + str_.size()); 36 } 37 38 CharT* eback() const {return base::eback();} 39 CharT* gptr() const {return base::gptr();} 40 CharT* egptr() const {return base::egptr();} 41 }; 42 43 int main() 44 { 45 { 46 testbuf<char> sb(" 123456789"); 47 std::istream is(&sb); 48 char s[5]; 49 is.read(s, 5); 50 assert(!is.eof()); 51 assert(!is.fail()); 52 assert(std::string(s, 5) == " 1234"); 53 assert(is.gcount() == 5); 54 is.read(s, 5); 55 assert(!is.eof()); 56 assert(!is.fail()); 57 assert(std::string(s, 5) == "56789"); 58 assert(is.gcount() == 5); 59 is.read(s, 5); 60 assert( is.eof()); 61 assert( is.fail()); 62 assert(is.gcount() == 0); 63 } 64 { 65 testbuf<wchar_t> sb(L" 123456789"); 66 std::wistream is(&sb); 67 wchar_t s[5]; 68 is.read(s, 5); 69 assert(!is.eof()); 70 assert(!is.fail()); 71 assert(std::wstring(s, 5) == L" 1234"); 72 assert(is.gcount() == 5); 73 is.read(s, 5); 74 assert(!is.eof()); 75 assert(!is.fail()); 76 assert(std::wstring(s, 5) == L"56789"); 77 assert(is.gcount() == 5); 78 is.read(s, 5); 79 assert( is.eof()); 80 assert( is.fail()); 81 assert(is.gcount() == 0); 82 } 83 } 84
