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//===----------------------------------------------------------------------===//
//
// 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://llvm.org/PR14074. 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 "test_macros.h"
#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;
std::fclose(f);
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;
}
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