Function esp32_hal::mem::memcmp

#[no_mangle]
pub unsafe extern "C" fn memcmp(
    s1: *const u8, 
    s2: *const u8, 
    n: usize
) -> i32

Compare n-bytes of data from s1 and s2 and returns <0 for s1<s2, 0 for s1=s2 and >0 for s1>s2