pcap_statustostr(3pcap) on macOS

The text 3e7c99ebcc31, as macOS 10.14.6, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.

convert a PCAP_ERROR_ or PCAP_WARNING_ value to a string

pcap_statustostr(3pcap) on macOS now