| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <fstream> |
| |
| // int_type underflow(); |
| |
| // This test is not entirely portable |
| |
| #include <fstream> |
| #include <cassert> |
| |
| #include "platform_support.h" // locale name macros |
| |
| template <class CharT> |
| struct test_buf |
| : public std::basic_filebuf<CharT> |
| { |
| typedef std::basic_filebuf<CharT> base; |
| typedef typename base::char_type char_type; |
| typedef typename base::int_type int_type; |
| |
| char_type* eback() const {return base::eback();} |
| char_type* gptr() const {return base::gptr();} |
| char_type* egptr() const {return base::egptr();} |
| void gbump(int n) {base::gbump(n);} |
| |
| virtual int_type underflow() {return base::underflow();} |
| }; |
| |
| int main() |
| { |
| { |
| test_buf<char> f; |
| assert(f.open("underflow.dat", std::ios_base::in) != 0); |
| assert(f.is_open()); |
| assert(f.eback() == 0); |
| assert(f.gptr() == 0); |
| assert(f.egptr() == 0); |
| assert(f.underflow() == '1'); |
| assert(f.eback() != 0); |
| assert(f.eback() == f.gptr()); |
| assert(*f.gptr() == '1'); |
| assert(f.egptr() - f.eback() == 9); |
| } |
| { |
| test_buf<char> f; |
| assert(f.open("underflow.dat", std::ios_base::in) != 0); |
| assert(f.pubsetbuf(0, 0)); |
| assert(f.is_open()); |
| assert(f.eback() == 0); |
| assert(f.gptr() == 0); |
| assert(f.egptr() == 0); |
| assert(f.underflow() == '1'); |
| assert(f.eback() != 0); |
| assert(f.eback() == f.gptr()); |
| assert(*f.gptr() == '1'); |
| assert(f.egptr() - f.eback() == 8); |
| f.gbump(8); |
| assert(f.sgetc() == '9'); |
| assert(f.eback()[0] == '5'); |
| assert(f.eback()[1] == '6'); |
| assert(f.eback()[2] == '7'); |
| assert(f.eback()[3] == '8'); |
| assert(f.gptr() - f.eback() == 4); |
| assert(*f.gptr() == '9'); |
| assert(f.egptr() - f.gptr() == 1); |
| } |
| { |
| test_buf<wchar_t> f; |
| assert(f.open("underflow.dat", std::ios_base::in) != 0); |
| assert(f.is_open()); |
| assert(f.eback() == 0); |
| assert(f.gptr() == 0); |
| assert(f.egptr() == 0); |
| assert(f.underflow() == L'1'); |
| assert(f.eback() != 0); |
| assert(f.eback() == f.gptr()); |
| assert(*f.gptr() == L'1'); |
| assert(f.egptr() - f.eback() == 9); |
| } |
| { |
| test_buf<wchar_t> f; |
| assert(f.pubsetbuf(0, 0)); |
| assert(f.open("underflow.dat", std::ios_base::in) != 0); |
| assert(f.is_open()); |
| assert(f.eback() == 0); |
| assert(f.gptr() == 0); |
| assert(f.egptr() == 0); |
| assert(f.underflow() == L'1'); |
| assert(f.eback() != 0); |
| assert(f.eback() == f.gptr()); |
| assert(*f.gptr() == L'1'); |
| assert(f.egptr() - f.eback() == 8); |
| f.gbump(8); |
| assert(f.sgetc() == L'9'); |
| assert(f.eback()[0] == L'5'); |
| assert(f.eback()[1] == L'6'); |
| assert(f.eback()[2] == L'7'); |
| assert(f.eback()[3] == L'8'); |
| assert(f.gptr() - f.eback() == 4); |
| assert(*f.gptr() == L'9'); |
| assert(f.egptr() - f.gptr() == 1); |
| } |
| { |
| test_buf<wchar_t> f; |
| f.pubimbue(std::locale(LOCALE_en_US_UTF_8)); |
| assert(f.open("underflow_utf8.dat", std::ios_base::in) != 0); |
| assert(f.is_open()); |
| assert(f.sbumpc() == 0x4E51); |
| assert(f.sbumpc() == 0x4E52); |
| assert(f.sbumpc() == 0x4E53); |
| assert(f.sbumpc() == -1); |
| } |
| } |