Function ringbuf_span

lightningd/log.c:109–133

}

static void ringbuf_span(const struct log_book *log,
			 size_t start, size_t len,
			 void **buf1, size_t *buf1len,
			 void **buf2, size_t *buf2len)
{
	size_t size = sizeof(log->ringbuf);
	size_t off  = start % size;
	size_t first = size - off;

	assert(len <= size);

	if (first > len)
		first = len;

	*buf1 = (void *)(log->ringbuf + off);
	*buf1len = first;

	if (first == len) {
		*buf2 = NULL;
		*buf2len = 0;
	} else {
		*buf2 = (void *)log->ringbuf;
		*buf2len = len - first;
	}
}

/* buf1/buf1len & buf2/buf2len -> dest/destlen */
static size_t copy_from(void *dest, size_t destlen,