1#![allow(dead_code)]
2
3pub fn memchr(n1: u8, haystack: &[u8]) -> Option<usize> {
4    haystack.iter().position(|&b| b == n1)
5}
6
7pub fn memchr2(n1: u8, n2: u8, haystack: &[u8]) -> Option<usize> {
8    haystack.iter().position(|&b| b == n1 || b == n2)
9}
10
11pub fn memchr3(n1: u8, n2: u8, n3: u8, haystack: &[u8]) -> Option<usize> {
12    haystack.iter().position(|&b| b == n1 || b == n2 || b == n3)
13}
14
15pub fn memrchr(n1: u8, haystack: &[u8]) -> Option<usize> {
16    haystack.iter().rposition(|&b| b == n1)
17}
18
19pub fn memrchr2(n1: u8, n2: u8, haystack: &[u8]) -> Option<usize> {
20    haystack.iter().rposition(|&b| b == n1 || b == n2)
21}
22
23pub fn memrchr3(n1: u8, n2: u8, n3: u8, haystack: &[u8]) -> Option<usize> {
24    haystack.iter().rposition(|&b| b == n1 || b == n2 || b == n3)
25}
26