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// Original implementation taken from rust-memchr. // Copyright 2015 Andrew Gallant, bluss and Nicolas Koch #[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> { crate::sys::memchr::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> { crate::sys::memchr::memrchr(needle, haystack) }