strtoull(3) on FreeBSD

The text c9dfefddc13e, as FreeBSD 5.3-RELEASE, FreeBSD 5.2.1-RELEASE, FreeBSD 5.2-RELEASE, FreeBSD 5.1-RELEASE, FreeBSD 5.0-RELEASE shipped it.

convert a string to an unsigned long, unsigned long long, uintmax_t, or u_quad_t integer