memx 0.2.2

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

#[test]
fn test_memrmem_empty_haystack() {
    let haystack = [];
    let needle = *b"a";
    assert_eq!(test_memrmem(&haystack, &needle), None);
}

#[test]
fn test_memrmem_empty_needle() {
    let haystack = *b"abc";
    let needle = [];
    assert_eq!(test_memrmem(&haystack, &needle), Some(3));
}

#[test]
fn test_memrmem_needle_longer_than_haystack() {
    let haystack = *b"ab";
    let needle = *b"abc";
    assert_eq!(test_memrmem(&haystack, &needle), None);
}

#[test]
fn test_memrmem_needle_at_start() {
    let haystack = *b"abcd";
    let needle = *b"ab";
    assert_eq!(test_memrmem(&haystack, &needle), Some(0));
}

#[test]
fn test_memrmem_needle_at_middle() {
    let haystack = *b"abcd";
    let needle = *b"bc";
    assert_eq!(test_memrmem(&haystack, &needle), Some(1));
}

#[test]
fn test_memrmem_needle_at_end() {
    let haystack = *b"abcd";
    let needle = *b"cd";
    assert_eq!(test_memrmem(&haystack, &needle), Some(2));
}

#[test]
fn test_memrmem_needle_not_found() {
    let haystack = *b"abcd";
    let needle = *b"xy";
    assert_eq!(test_memrmem(&haystack, &needle), None);
}

#[test]
fn test_memrmem_multiple_occurrences() {
    let haystack = *b"ababc";
    let needle = *b"ab";
    assert_eq!(test_memrmem(&haystack, &needle), Some(2));
}

#[test]
fn test_memrmem_long_buffers() {
    let haystack = [0; 1024];
    let needle = [1; 16];
    let mut long_haystack = haystack.to_vec();
    long_haystack[500..516].copy_from_slice(&needle);
    assert_eq!(test_memrmem(&long_haystack, &needle), Some(500));
}

#[test]
fn test_memrmem_long_buffers_not_found() {
    let haystack = [0; 1024];
    let needle = [1; 16];
    assert_eq!(test_memrmem(&haystack, &needle), None);
}