| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <streambuf> |
| |
| // template <class charT, class traits = char_traits<charT> > |
| // class basic_streambuf; |
| |
| // streamsize xsputn(const char_type* s, streamsize n); |
| |
| // Test https://bugs.llvm.org/show_bug.cgi?id=14074. The bug is really inside |
| // basic_streambuf, but I can't seem to reproduce without going through one |
| // of its derived classes. |
| |
| #include <cassert> |
| #include <cstddef> |
| #include <cstdio> |
| #include <fstream> |
| #include <sstream> |
| #include <string> |
| #include "platform_support.h" |
| |
| |
| // Count the number of bytes in a file -- make sure to use only functionality |
| // provided by the C library to avoid relying on the C++ library, which we're |
| // trying to test. |
| static std::size_t count_bytes(char const* filename) { |
| std::FILE* f = std::fopen(filename, "rb"); |
| std::size_t count = 0; |
| while (std::fgetc(f) != EOF) |
| ++count; |
| return count; |
| } |
| |
| int main(int, char**) { |
| { |
| // with basic_stringbuf |
| std::basic_stringbuf<char> buf; |
| std::streamsize sz = buf.sputn("\xFF", 1); |
| assert(sz == 1); |
| assert(buf.str().size() == 1); |
| } |
| { |
| // with basic_filebuf |
| std::string temp = get_temp_file_name(); |
| { |
| std::basic_filebuf<char> buf; |
| buf.open(temp.c_str(), std::ios_base::out); |
| std::streamsize sz = buf.sputn("\xFF", 1); |
| assert(sz == 1); |
| } |
| assert(count_bytes(temp.c_str()) == 1); |
| std::remove(temp.c_str()); |
| } |
| |
| return 0; |
| } |