1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <streambuf>
10
11// template <class charT, class traits = char_traits<charT> >
12// class basic_streambuf;
13
14// streamsize xsputn(const char_type* s, streamsize n);
15
16// Test https://llvm.org/PR14074. The bug is really inside
17// basic_streambuf, but I can't seem to reproduce without going through one
18// of its derived classes.
19
20// UNSUPPORTED: no-filesystem
21
22#include <cassert>
23#include <cstddef>
24#include <cstdio>
25#include <fstream>
26#include <sstream>
27#include <string>
28#include "test_macros.h"
29#include "platform_support.h"
30
31
32// Count the number of bytes in a file -- make sure to use only functionality
33// provided by the C library to avoid relying on the C++ library, which we're
34// trying to test.
35static std::size_t count_bytes(char const* filename) {
36 std::FILE* f = std::fopen(filename: filename, modes: "rb");
37 std::size_t count = 0;
38 while (std::fgetc(stream: f) != EOF)
39 ++count;
40 std::fclose(stream: f);
41 return count;
42}
43
44int main(int, char**) {
45 {
46 // with basic_stringbuf
47 std::basic_stringbuf<char> buf;
48 std::streamsize sz = buf.sputn(s: "\xFF", n: 1);
49 assert(sz == 1);
50 assert(buf.str().size() == 1);
51 }
52 {
53 // with basic_filebuf
54 std::string temp = get_temp_file_name();
55 {
56 std::basic_filebuf<char> buf;
57 buf.open(s: temp.c_str(), mode: std::ios_base::out);
58 std::streamsize sz = buf.sputn(s: "\xFF", n: 1);
59 assert(sz == 1);
60 }
61 assert(count_bytes(temp.c_str()) == 1);
62 std::remove(filename: temp.c_str());
63 }
64
65 return 0;
66}
67

source code of libcxx/test/std/input.output/stream.buffers/streambuf/streambuf.virtuals/streambuf.virt.put/xsputn.PR14074.pass.cpp