Method xsputn

fhstream.cpp:85–112

}

std::streamsize	ofhbuf::xsputn (const char* s, std::streamsize n)
{
	// Use heuristic to decide whether to write directly or just use buffer
	// Write directly only if n >= MIN(4096, available buffer capacity)
	// (this is similar to what basic_filebuf does)

	if (n < std::min<std::streamsize>(4096, epptr() - pptr())) {
		// Not worth it to do a direct write
		return std::streambuf::xsputn(s, n);
	}

	// Before we can do a direct write of this string, we need to flush
	// out the current contents of the buffer.
	if (pbase() != pptr()) {
		overflow(traits_type::eof()); // throws an exception or it succeeds
	}

	// Now we can go ahead and write out the string.
	size_t		bytes_to_write = n;

	while (bytes_to_write > 0) {
		const size_t	bytes_written = write_fun(handle, s, bytes_to_write);
		bytes_to_write -= bytes_written;
		s += bytes_written;
	}

	return n; // Return the total bytes written
}

std::streambuf*	ofhbuf::setbuf (char* s, std::streamsize n)
{