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