curs_getcchar(3x) on macOS
The text ec6dda816d23, as macOS 13.5, macOS 13.4, macOS 13.3, macOS 13.2, macOS 13.1, macOS 13.0, macOS 12.5, macOS 12.4, macOS 12.3, macOS 12.2, macOS 12.1, macOS 12.0.1 shipped it.
Get a wide character string and rendition from a cchar_t or set a cchar_t from a wide-character string