1#![allow(dead_code)]
2
3pub fn memchr(n1: u8, haystack: &[u8]) -> Option<usize> {
4 haystack
5 .iter()
6 .position(|&b| b == n1)
7}
8
9pub fn memchr2(n1: u8, n2: u8, haystack: &[u8]) -> Option<usize> {
10 haystack
11 .iter()
12 .position(|&b| b == n1 || b == n2)
13}
14
15pub fn memchr3(n1: u8, n2: u8, n3: u8, haystack: &[u8]) -> Option<usize> {
16 haystack
17 .iter()
18 .position(|&b| b == n1 || b == n2 || b == n3)
19}
20
21pub fn memrchr(n1: u8, haystack: &[u8]) -> Option<usize> {
22 haystack
23 .iter()
24 .rposition(|&b| b == n1)
25}
26
27pub fn memrchr2(n1: u8, n2: u8, haystack: &[u8]) -> Option<usize> {
28 haystack
29 .iter()
30 .rposition(|&b| b == n1 || b == n2)
31}
32
33pub fn memrchr3(n1: u8, n2: u8, n3: u8, haystack: &[u8]) -> Option<usize> {
34 haystack
35 .iter()
36 .rposition(|&b| b == n1 || b == n2 || b == n3)
37}