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_lib=x86_64-apple-darwin11 11 // XFAIL: with_system_lib=x86_64-apple-darwin12 12 13 // <istream> 14 15 // basic_istream<charT,traits>& read(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 30 testbuf() {} 31 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 39 CharT* eback() const {return base::eback();} 40 CharT* gptr() const {return base::gptr();} 41 CharT* egptr() const {return base::egptr();} 42 }; 43 44 int main() 45 { 46 { 47 testbuf<char> sb(" 123456789"); 48 std::istream is(&sb); 49 char s[5]; 50 is.read(s, 5); 51 assert(!is.eof()); 52 assert(!is.fail()); 53 assert(std::string(s, 5) == " 1234"); 54 assert(is.gcount() == 5); 55 is.read(s, 5); 56 assert(!is.eof()); 57 assert(!is.fail()); 58 assert(std::string(s, 5) == "56789"); 59 assert(is.gcount() == 5); 60 is.read(s, 5); 61 assert( is.eof()); 62 assert( is.fail()); 63 assert(is.gcount() == 0); 64 } 65 { 66 testbuf<wchar_t> sb(L" 123456789"); 67 std::wistream is(&sb); 68 wchar_t s[5]; 69 is.read(s, 5); 70 assert(!is.eof()); 71 assert(!is.fail()); 72 assert(std::wstring(s, 5) == L" 1234"); 73 assert(is.gcount() == 5); 74 is.read(s, 5); 75 assert(!is.eof()); 76 assert(!is.fail()); 77 assert(std::wstring(s, 5) == L"56789"); 78 assert(is.gcount() == 5); 79 is.read(s, 5); 80 assert( is.eof()); 81 assert( is.fail()); 82 assert(is.gcount() == 0); 83 } 84 } 85
