| Howard Hinnant | 3e51952 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| Howard Hinnant | 5b08a8a | 2010-05-11 21:36:01 +0000 | [diff] [blame^] | 3 | // The LLVM Compiler Infrastructure |
| Howard Hinnant | 3e51952 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | // <fstream> |
| 11 | |
| 12 | // int_type underflow(); |
| 13 | |
| 14 | // This test is not entirely portable |
| 15 | |
| 16 | #include <fstream> |
| 17 | #include <cassert> |
| 18 | |
| 19 | template <class CharT> |
| 20 | struct test_buf |
| 21 | : public std::basic_filebuf<CharT> |
| 22 | { |
| 23 | typedef std::basic_filebuf<CharT> base; |
| 24 | typedef typename base::char_type char_type; |
| 25 | typedef typename base::int_type int_type; |
| 26 | |
| 27 | char_type* eback() const {return base::eback();} |
| 28 | char_type* gptr() const {return base::gptr();} |
| 29 | char_type* egptr() const {return base::egptr();} |
| 30 | void gbump(int n) {base::gbump(n);} |
| 31 | |
| 32 | virtual int_type underflow() {return base::underflow();} |
| 33 | }; |
| 34 | |
| 35 | int main() |
| 36 | { |
| 37 | { |
| 38 | test_buf<char> f; |
| 39 | assert(f.open("underflow.dat", std::ios_base::in) != 0); |
| 40 | assert(f.is_open()); |
| 41 | assert(f.eback() == 0); |
| 42 | assert(f.gptr() == 0); |
| 43 | assert(f.egptr() == 0); |
| 44 | assert(f.underflow() == '1'); |
| 45 | assert(f.eback() != 0); |
| 46 | assert(f.eback() == f.gptr()); |
| 47 | assert(*f.gptr() == '1'); |
| 48 | assert(f.egptr() - f.eback() == 9); |
| 49 | } |
| 50 | { |
| 51 | test_buf<char> f; |
| 52 | assert(f.open("underflow.dat", std::ios_base::in) != 0); |
| 53 | assert(f.pubsetbuf(0, 0)); |
| 54 | assert(f.is_open()); |
| 55 | assert(f.eback() == 0); |
| 56 | assert(f.gptr() == 0); |
| 57 | assert(f.egptr() == 0); |
| 58 | assert(f.underflow() == '1'); |
| 59 | assert(f.eback() != 0); |
| 60 | assert(f.eback() == f.gptr()); |
| 61 | assert(*f.gptr() == '1'); |
| 62 | assert(f.egptr() - f.eback() == 8); |
| 63 | f.gbump(8); |
| 64 | assert(f.sgetc() == '9'); |
| 65 | assert(f.eback()[0] == '5'); |
| 66 | assert(f.eback()[1] == '6'); |
| 67 | assert(f.eback()[2] == '7'); |
| 68 | assert(f.eback()[3] == '8'); |
| 69 | assert(f.gptr() - f.eback() == 4); |
| 70 | assert(*f.gptr() == '9'); |
| 71 | assert(f.egptr() - f.gptr() == 1); |
| 72 | } |
| 73 | { |
| 74 | test_buf<wchar_t> f; |
| 75 | assert(f.open("underflow.dat", std::ios_base::in) != 0); |
| 76 | assert(f.is_open()); |
| 77 | assert(f.eback() == 0); |
| 78 | assert(f.gptr() == 0); |
| 79 | assert(f.egptr() == 0); |
| 80 | assert(f.underflow() == L'1'); |
| 81 | assert(f.eback() != 0); |
| 82 | assert(f.eback() == f.gptr()); |
| 83 | assert(*f.gptr() == L'1'); |
| 84 | assert(f.egptr() - f.eback() == 9); |
| 85 | } |
| 86 | { |
| 87 | test_buf<wchar_t> f; |
| 88 | assert(f.pubsetbuf(0, 0)); |
| 89 | assert(f.open("underflow.dat", std::ios_base::in) != 0); |
| 90 | assert(f.is_open()); |
| 91 | assert(f.eback() == 0); |
| 92 | assert(f.gptr() == 0); |
| 93 | assert(f.egptr() == 0); |
| 94 | assert(f.underflow() == L'1'); |
| 95 | assert(f.eback() != 0); |
| 96 | assert(f.eback() == f.gptr()); |
| 97 | assert(*f.gptr() == L'1'); |
| 98 | assert(f.egptr() - f.eback() == 8); |
| 99 | f.gbump(8); |
| 100 | assert(f.sgetc() == L'9'); |
| 101 | assert(f.eback()[0] == L'5'); |
| 102 | assert(f.eback()[1] == L'6'); |
| 103 | assert(f.eback()[2] == L'7'); |
| 104 | assert(f.eback()[3] == L'8'); |
| 105 | assert(f.gptr() - f.eback() == 4); |
| 106 | assert(*f.gptr() == L'9'); |
| 107 | assert(f.egptr() - f.gptr() == 1); |
| 108 | } |
| 109 | { |
| 110 | test_buf<wchar_t> f; |
| 111 | f.pubimbue(std::locale("en_US.UTF-8")); |
| 112 | assert(f.open("underflow_utf8.dat", std::ios_base::in) != 0); |
| 113 | assert(f.is_open()); |
| 114 | assert(f.sbumpc() == 0x4E51); |
| 115 | assert(f.sbumpc() == 0x4E52); |
| 116 | assert(f.sbumpc() == 0x4E53); |
| 117 | assert(f.sbumpc() == -1); |
| 118 | } |
| 119 | } |