strtoul(3) on FreeBSD
The text d2fed1d9d639, as FreeBSD 14.5-RELEASE, FreeBSD 14.4-RELEASE, FreeBSD 14.3-RELEASE, FreeBSD 14.2-RELEASE, FreeBSD 14.1-RELEASE, FreeBSD 14.0-RELEASE shipped it.
convert a string to an unsigned long, unsigned long long, uintmax_t, or u_quad_t integer