34d4f0c136
We've built up quite a few links directly to github within the code base. We should instead use `llvm.org/PR<issue-number>` to link to bugs, since that is resilient to the bug tracker changing in the future. This is especially relevant for tests linking to bugs, since they will probably be there for decades to come. A nice side effect is that these links are significantly shorter than the GH links, making them much less of an eyesore. This patch also replaces a few links that linked to the old bugzilla instance on llvm.org.
128 lines
3.2 KiB
C++
128 lines
3.2 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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// TODO(mordante) Investigate
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// UNSUPPORTED: apple-clang
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// <fstream>
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// basic_streambuf<charT, traits>* setbuf(char_type* s, streamsize n) override;
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// This test requires the fix to https://llvm.org/PR60509 in the dylib,
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// which landed in 5afb937d8a30445642ccaf33866ee4cdd0713222.
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// XFAIL: using-built-library-before-llvm-19
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#include <fstream>
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#include <cstddef>
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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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static std::size_t file_size(const char* filename) {
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FILE* f = std::fopen(filename, "rb");
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std::fseek(f, 0, SEEK_END);
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long result = std::ftell(f);
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std::fclose(f);
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return result;
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}
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// Helper class to expose some protected std::basic_filebuf<CharT> members.
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template <class CharT>
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struct filebuf : public std::basic_filebuf<CharT> {
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CharT* base() { return this->pbase(); }
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CharT* ptr() { return this->pptr(); }
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};
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template <class CharT>
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static void buffered_request() {
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filebuf<CharT> buffer;
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CharT b[10] = {0};
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assert(buffer.pubsetbuf(b, 10) == &buffer);
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buffer.open("test.dat", std::ios_base::out);
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buffer.sputc(CharT('a'));
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assert(b[0] == 'a');
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buffer.close();
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assert(file_size<CharT>("test.dat") == 1);
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}
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template <class CharT>
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static void unbuffered_request_before_open() {
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filebuf<CharT> buffer;
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assert(buffer.pubsetbuf(nullptr, 0) == &buffer);
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assert(buffer.base() == nullptr);
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assert(buffer.ptr() == nullptr);
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buffer.open("test.dat", std::ios_base::out);
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assert(buffer.base() == nullptr);
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assert(buffer.ptr() == nullptr);
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buffer.sputc(CharT('a'));
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assert(buffer.base() == nullptr);
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assert(buffer.ptr() == nullptr);
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assert(file_size<CharT>("test.dat") == 1);
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}
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template <class CharT>
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static void unbuffered_request_after_open() {
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filebuf<CharT> buffer;
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buffer.open("test.dat", std::ios_base::out);
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assert(buffer.pubsetbuf(nullptr, 0) == &buffer);
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assert(buffer.base() == nullptr);
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assert(buffer.ptr() == nullptr);
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buffer.sputc(CharT('a'));
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assert(buffer.base() == nullptr);
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assert(buffer.ptr() == nullptr);
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assert(file_size<CharT>("test.dat") == 1);
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}
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template <class CharT>
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static void unbuffered_request_after_open_ate() {
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filebuf<CharT> buffer;
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buffer.open("test.dat", std::ios_base::out | std::ios_base::ate);
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assert(buffer.pubsetbuf(nullptr, 0) == &buffer);
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buffer.sputc(CharT('a'));
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assert(file_size<CharT>("test.dat") <= 1);
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// on libc++ buffering is used by default.
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LIBCPP_ASSERT(file_size<CharT>("test.dat") == 0);
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buffer.close();
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assert(file_size<CharT>("test.dat") == 1);
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}
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template <class CharT>
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static void test() {
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buffered_request<CharT>();
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unbuffered_request_before_open<CharT>();
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unbuffered_request_after_open<CharT>();
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unbuffered_request_after_open_ate<CharT>();
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}
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int main(int, char**) {
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test<char>();
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test<wchar_t>();
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#endif
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return 0;
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}
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