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 // REQUIRES: locale.en_US.UTF-8 11 12 // <fstream> 13 14 // int_type underflow(); 15 16 // This test is not entirely portable 17 18 #include <fstream> 19 #include <cstddef> 20 #include <cassert> 21 22 #include "platform_support.h" // locale name macros 23 24 template <class CharT> 25 struct test_buf 26 : public std::basic_filebuf<CharT> 27 { 28 typedef std::basic_filebuf<CharT> base; 29 typedef typename base::char_type char_type; 30 typedef typename base::int_type int_type; 31 32 char_type* eback() const {return base::eback();} 33 char_type* gptr() const {return base::gptr();} 34 char_type* egptr() const {return base::egptr();} 35 void gbump(int n) {base::gbump(n);} 36 37 virtual int_type underflow() {return base::underflow();} 38 }; 39 40 int main() 41 { 42 { 43 test_buf<char> f; 44 assert(f.open("underflow.dat", std::ios_base::in) != 0); 45 assert(f.is_open()); 46 assert(f.eback() == 0); 47 assert(f.gptr() == 0); 48 assert(f.egptr() == 0); 49 assert(f.underflow() == '1'); 50 assert(f.eback() != 0); 51 assert(f.eback() == f.gptr()); 52 assert(*f.gptr() == '1'); 53 assert(f.egptr() - f.eback() == 9); 54 } 55 { 56 test_buf<char> f; 57 assert(f.open("underflow.dat", std::ios_base::in) != 0); 58 assert(f.pubsetbuf(0, 0)); 59 assert(f.is_open()); 60 assert(f.eback() == 0); 61 assert(f.gptr() == 0); 62 assert(f.egptr() == 0); 63 assert(f.underflow() == '1'); 64 assert(f.eback() != 0); 65 assert(f.eback() == f.gptr()); 66 assert(*f.gptr() == '1'); 67 assert(f.egptr() - f.eback() == 8); 68 f.gbump(8); 69 assert(f.sgetc() == '9'); 70 assert(f.eback()[0] == '5'); 71 assert(f.eback()[1] == '6'); 72 assert(f.eback()[2] == '7'); 73 assert(f.eback()[3] == '8'); 74 assert(f.gptr() - f.eback() == 4); 75 assert(*f.gptr() == '9'); 76 assert(f.egptr() - f.gptr() == 1); 77 } 78 { 79 test_buf<wchar_t> f; 80 assert(f.open("underflow.dat", std::ios_base::in) != 0); 81 assert(f.is_open()); 82 assert(f.eback() == 0); 83 assert(f.gptr() == 0); 84 assert(f.egptr() == 0); 85 assert(f.underflow() == L'1'); 86 assert(f.eback() != 0); 87 assert(f.eback() == f.gptr()); 88 assert(*f.gptr() == L'1'); 89 assert(f.egptr() - f.eback() == 9); 90 } 91 { 92 test_buf<wchar_t> f; 93 assert(f.pubsetbuf(0, 0)); 94 assert(f.open("underflow.dat", std::ios_base::in) != 0); 95 assert(f.is_open()); 96 assert(f.eback() == 0); 97 assert(f.gptr() == 0); 98 assert(f.egptr() == 0); 99 assert(f.underflow() == L'1'); 100 assert(f.eback() != 0); 101 assert(f.eback() == f.gptr()); 102 assert(*f.gptr() == L'1'); 103 assert(f.egptr() - f.eback() == 8); 104 f.gbump(8); 105 assert(f.sgetc() == L'9'); 106 assert(f.eback()[0] == L'5'); 107 assert(f.eback()[1] == L'6'); 108 assert(f.eback()[2] == L'7'); 109 assert(f.eback()[3] == L'8'); 110 assert(f.gptr() - f.eback() == 4); 111 assert(*f.gptr() == L'9'); 112 assert(f.egptr() - f.gptr() == 1); 113 } 114 { 115 typedef std::char_traits<wchar_t> Traits; 116 test_buf<wchar_t> f; 117 f.pubimbue(std::locale(LOCALE_en_US_UTF_8)); 118 assert(f.open("underflow_utf8.dat", std::ios_base::in) != 0); 119 assert(f.is_open()); 120 assert(f.sbumpc() == 0x4E51); 121 assert(f.sbumpc() == 0x4E52); 122 assert(f.sbumpc() == 0x4E53); 123 assert(f.sbumpc() == static_cast<Traits::int_type>(-1)); 124 } 125 } 126
