regex/find_byte.rs
1/// Searches for the given needle in the given haystack.
2///
3/// If the perf-literal feature is enabled, then this uses the super optimized
4/// memchr crate. Otherwise, it uses the naive byte-at-a-time implementation.
5pub(crate) fn find_byte(needle: u8, haystack: &[u8]) -> Option<usize> {
6 #[cfg(not(feature = "perf-literal"))]
7 fn imp(needle: u8, haystack: &[u8]) -> Option<usize> {
8 haystack.iter().position(|&b| b == needle)
9 }
10
11 #[cfg(feature = "perf-literal")]
12 fn imp(needle: u8, haystack: &[u8]) -> Option<usize> {
13 memchr::memchr(needle, haystack)
14 }
15
16 imp(needle, haystack)
17}