Function m_getptr

freebsd/kern/uipc_mbuf.c:1255–1278

* Return a pointer to mbuf/offset of location in mbuf chain. */

 * Return a pointer to mbuf/offset of location in mbuf chain.
 */
struct mbuf *
m_getptr(struct mbuf *m, int loc, int *off)
{

	while (loc >= 0) {
		/* Normal end of search. */
		if (m->m_len > loc) {
			*off = loc;
			return (m);
		} else {
			loc -= m->m_len;
			if (m->m_next == NULL) {
				if (loc == 0) {
					/* Point at the end of valid data. */
					*off = m->m_len;
					return (m);
				}
				return (NULL);
			}
			m = m->m_next;
		}
	}
	return (NULL);
}

#pragma GCC diagnostic ignored "-Wformat"
#pragma GCC diagnostic ignored "-Wformat-extra-args"