Function index 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn index(
    s: *const c_char,
    c: c_int,
) -> *mut c_char

👎Deprecated

See https://pubs.opengroup.org/onlinepubs/009695399/functions/index.html.

Deprecation

The index() function was marked legacy in the Open Group Base Specifications Issue 6, and removed in Issue 7.