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