memx 0.2.0

memory functions like libc memcmp(), memchr(), memmem(), memcpy(), memset()
Documentation 
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/**/

#[test]
fn test_memrchr_empty_buffer() {
    let buf = [];
    assert_eq!(test_memrchr(&buf, b'a'), None);
}

#[test]
fn test_memrchr_single_element_found() {
    let buf = [b'a'];
    assert_eq!(test_memrchr(&buf, b'a'), Some(0));
}

#[test]
fn test_memrchr_single_element_not_found() {
    let buf = [b'b'];
    assert_eq!(test_memrchr(&buf, b'a'), None);
}

#[test]
fn test_memrchr_needle_at_start() {
    let buf = [b'a', b'b', b'c'];
    assert_eq!(test_memrchr(&buf, b'a'), Some(0));
}

#[test]
fn test_memrchr_needle_at_middle() {
    let buf = [b'a', b'b', b'c'];
    assert_eq!(test_memrchr(&buf, b'b'), Some(1));
}

#[test]
fn test_memrchr_needle_at_end() {
    let buf = [b'a', b'b', b'c'];
    assert_eq!(test_memrchr(&buf, b'c'), Some(2));
}

#[test]
fn test_memrchr_needle_not_found() {
    let buf = [b'a', b'b', b'c'];
    assert_eq!(test_memrchr(&buf, b'd'), None);
}

#[test]
fn test_memrchr_multiple_occurrences() {
    let buf = [b'a', b'b', b'a', b'c', b'a'];
    assert_eq!(test_memrchr(&buf, b'a'), Some(4));
}

#[test]
fn test_memrchr_long_buffer() {
    let buf = [0; 1024];
    let mut expected_idx = None;
    let mut long_buf = buf.to_vec();
    for (i, item) in long_buf.iter_mut().enumerate().take(1024) {
        if i == 512 {
            *item = b'x';
            expected_idx = Some(i);
        }
    }
    assert_eq!(test_memrchr(&long_buf, b'x'), expected_idx);
}

#[test]
fn test_memrchr_long_buffer_not_found() {
    let buf = [0; 1024];
    assert_eq!(test_memrchr(&buf, b'x'), None);
}