evbuffer_expand(struct evbuffer *buf, size_t datlen)
{
	size_t need = buf->misalign + buf->off + datlen;

	/* If we can fit all the data, then we don't have to do anything */
	if (buf->totallen >= need)
		return (0);

	/*
	 * If the misalignment fulfills our data needs, we just force an
	 * alignment to happen.  Afterwards, we have enough space.
	 */
	if (buf->misalign >= datlen) {
		evbuffer_align(buf);
	} else {
		void *newbuf;
		size_t length = buf->totallen;

		if (length < 256)
			length = 256;
		while (length < need)
			length <<= 1;

		if (buf->orig_buffer != buf->buffer)
			evbuffer_align(buf);
		if ((newbuf = realloc(buf->buffer, length)) == NULL)
			return (-1);

		buf->orig_buffer = buf->buffer = newbuf;
		buf->totallen = length;
	}

	return (0);
}
Unknown