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f4c1258d56
Some embedded platforms do not wish to support the C library functionality for handling wchar_t because they have no use for it. It makes sense for libc++ to work properly on those platforms, so this commit adds a carve-out of functionality for wchar_t. Unfortunately, unlike some other carve-outs (e.g. random device), this patch touches several parts of the library. However, despite the wide impact of this patch, I still think it is important to support this configuration since it makes it much simpler to port libc++ to some embedded platforms. Differential Revision: https://reviews.llvm.org/D111265
103 lines
3.7 KiB
C++
103 lines
3.7 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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// <sstream>
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// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
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// class basic_stringbuf
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// int_type pbackfail(int_type c = traits::eof());
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#include <sstream>
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#include <cassert>
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#include "test_macros.h"
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template <class CharT>
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struct testbuf
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: public std::basic_stringbuf<CharT>
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{
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typedef std::basic_stringbuf<CharT> base;
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explicit testbuf(const std::basic_string<CharT>& str,
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std::ios_base::openmode which = std::ios_base::in | std::ios_base::out)
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: base(str, which) {}
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typename base::int_type
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pbackfail(typename base::int_type c = base::traits_type::eof())
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{return base::pbackfail(c);}
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void pbump(int n) {base::pbump(n);}
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};
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int main(int, char**)
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{
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// sanity check
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{
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testbuf<char> tb("");
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tb.pbackfail();
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}
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{
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testbuf<char> sb("123", std::ios_base::in);
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assert(sb.sgetc() == '1');
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assert(sb.snextc() == '2');
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assert(sb.snextc() == '3');
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assert(sb.sgetc() == '3');
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assert(sb.snextc() == std::char_traits<char>::eof());
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assert(sb.pbackfail('3') == '3');
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assert(sb.pbackfail('3') == std::char_traits<char>::eof());
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assert(sb.pbackfail('2') == '2');
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assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof());
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assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof());
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assert(sb.str() == "123");
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}
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{
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testbuf<char> sb("123");
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assert(sb.sgetc() == '1');
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assert(sb.snextc() == '2');
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assert(sb.snextc() == '3');
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assert(sb.sgetc() == '3');
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assert(sb.snextc() == std::char_traits<char>::eof());
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assert(sb.pbackfail('3') == '3');
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assert(sb.pbackfail('3') == '3');
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assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof());
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assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof());
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assert(sb.str() == "133");
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}
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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{
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testbuf<wchar_t> sb(L"123", std::ios_base::in);
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assert(sb.sgetc() == L'1');
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assert(sb.snextc() == L'2');
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assert(sb.snextc() == L'3');
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assert(sb.sgetc() == L'3');
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assert(sb.snextc() == std::char_traits<wchar_t>::eof());
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assert(sb.pbackfail(L'3') == L'3');
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assert(sb.pbackfail(L'3') == std::char_traits<wchar_t>::eof());
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assert(sb.pbackfail(L'2') == L'2');
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assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof());
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assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof());
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assert(sb.str() == L"123");
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}
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{
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testbuf<wchar_t> sb(L"123");
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assert(sb.sgetc() == L'1');
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assert(sb.snextc() == L'2');
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assert(sb.snextc() == L'3');
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assert(sb.sgetc() == L'3');
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assert(sb.snextc() == std::char_traits<wchar_t>::eof());
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assert(sb.pbackfail(L'3') == L'3');
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assert(sb.pbackfail(L'3') == L'3');
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assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof());
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assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof());
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assert(sb.str() == L"133");
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}
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#endif
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return 0;
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}
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