Function sbuf_len

freebsd/kern/subr_sbuf.c:849–865

* Return the length of the sbuf data. */

 * Return the length of the sbuf data.
 */
ssize_t
sbuf_len(struct sbuf *s)
{

	assert_sbuf_integrity(s);
	/* don't care if it's finished or not */
	KASSERT(s->s_drain_func == NULL,
	    ("%s makes no sense on sbuf %p with drain", __func__, s));

	if (s->s_error != 0)
		return (-1);

	/* If finished, nulterm is already in len, else add one. */
	if (SBUF_NULINCLUDED(s) && !SBUF_ISFINISHED(s))
		return (s->s_len + 1);
	return (s->s_len);
}

/*
 * Clear an sbuf, free its buffer if necessary.