Function wcschr 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn wcschr(
    ws: *const wchar_t,
    wc: wchar_t,
) -> *mut wchar_t

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/wcschr.html.

Safety

The caller is required to ensure that ws is a valid pointer to a buffer containing at least one nul value. The pointed-to buffer must not be modified for the duration of the call.