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
83 lines
3.0 KiB
C++
83 lines
3.0 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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// pos_type seekpos(pos_type sp,
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// ios_base::openmode which = ios_base::in | ios_base::out);
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#include <sstream>
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#include <cassert>
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#include "test_macros.h"
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int main(int, char**)
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{
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{
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std::stringbuf sb("0123456789", std::ios_base::in);
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assert(sb.pubseekpos(3, std::ios_base::out) == -1);
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assert(sb.pubseekpos(3, std::ios_base::in | std::ios_base::out) == -1);
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assert(sb.pubseekpos(3, std::ios_base::in) == 3);
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assert(sb.sgetc() == '3');
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}
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{
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std::stringbuf sb("0123456789", std::ios_base::out);
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assert(sb.pubseekpos(3, std::ios_base::in) == -1);
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assert(sb.pubseekpos(3, std::ios_base::out | std::ios_base::in) == -1);
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assert(sb.pubseekpos(3, std::ios_base::out) == 3);
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assert(sb.sputc('a') == 'a');
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assert(sb.str() == "012a456789");
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}
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{
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std::stringbuf sb("0123456789");
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assert(sb.pubseekpos(3, std::ios_base::in) == 3);
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assert(sb.sgetc() == '3');
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assert(sb.pubseekpos(3, std::ios_base::out | std::ios_base::in) == 3);
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assert(sb.sgetc() == '3');
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assert(sb.sputc('a') == 'a');
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assert(sb.str() == "012a456789");
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assert(sb.pubseekpos(3, std::ios_base::out) == 3);
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assert(sb.sputc('3') == '3');
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assert(sb.str() == "0123456789");
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}
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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{
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std::wstringbuf sb(L"0123456789", std::ios_base::in);
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assert(sb.pubseekpos(3, std::ios_base::out) == -1);
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assert(sb.pubseekpos(3, std::ios_base::in | std::ios_base::out) == -1);
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assert(sb.pubseekpos(3, std::ios_base::in) == 3);
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assert(sb.sgetc() == L'3');
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}
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{
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std::wstringbuf sb(L"0123456789", std::ios_base::out);
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assert(sb.pubseekpos(3, std::ios_base::in) == -1);
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assert(sb.pubseekpos(3, std::ios_base::out | std::ios_base::in) == -1);
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assert(sb.pubseekpos(3, std::ios_base::out) == 3);
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assert(sb.sputc(L'a') == L'a');
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assert(sb.str() == L"012a456789");
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}
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{
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std::wstringbuf sb(L"0123456789");
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assert(sb.pubseekpos(3, std::ios_base::in) == 3);
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assert(sb.sgetc() == L'3');
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assert(sb.pubseekpos(3, std::ios_base::out | std::ios_base::in) == 3);
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assert(sb.sgetc() == L'3');
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assert(sb.sputc(L'a') == L'a');
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assert(sb.str() == L"012a456789");
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assert(sb.pubseekpos(3, std::ios_base::out) == 3);
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assert(sb.sputc(L'3') == L'3');
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assert(sb.str() == L"0123456789");
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}
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#endif
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return 0;
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}
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