| // Original implementation taken from rust-memchr. |
| // Copyright 2015 Andrew Gallant, bluss and Nicolas Koch |
| |
| use crate::sys::memchr as sys; |
| |
| #[cfg(test)] |
| mod tests; |
| |
| /// A safe interface to `memchr`. |
| /// |
| /// Returns the index corresponding to the first occurrence of `needle` in |
| /// `haystack`, or `None` if one is not found. |
| /// |
| /// memchr reduces to super-optimized machine code at around an order of |
| /// magnitude faster than `haystack.iter().position(|&b| b == needle)`. |
| /// (See benchmarks.) |
| /// |
| /// # Examples |
| /// |
| /// This shows how to find the first position of a byte in a byte string. |
| /// |
| /// ```ignore (cannot-doctest-private-modules) |
| /// use memchr::memchr; |
| /// |
| /// let haystack = b"the quick brown fox"; |
| /// assert_eq!(memchr(b'k', haystack), Some(8)); |
| /// ``` |
| #[inline] |
| pub fn memchr(needle: u8, haystack: &[u8]) -> Option<usize> { |
| sys::memchr(needle, haystack) |
| } |
| |
| /// A safe interface to `memrchr`. |
| /// |
| /// Returns the index corresponding to the last occurrence of `needle` in |
| /// `haystack`, or `None` if one is not found. |
| /// |
| /// # Examples |
| /// |
| /// This shows how to find the last position of a byte in a byte string. |
| /// |
| /// ```ignore (cannot-doctest-private-modules) |
| /// use memchr::memrchr; |
| /// |
| /// let haystack = b"the quick brown fox"; |
| /// assert_eq!(memrchr(b'o', haystack), Some(17)); |
| /// ``` |
| #[inline] |
| pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> { |
| sys::memrchr(needle, haystack) |
| } |