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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
125 lines
3.8 KiB
C++
125 lines
3.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// REQUIRES: locale.en_US.UTF-8
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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 <cstddef>
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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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typedef std::char_traits<wchar_t> Traits;
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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() == static_cast<Traits::int_type>(-1));
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}
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}
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