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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
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| <span id="611">611</span> |
| <span id="612">612</span> |
| <span id="613">613</span> |
| </pre><pre class="rust "> |
| <span class="doccomment">/*! |
| This crate defines two functions, `memchr` and `memrchr`, which expose a safe interface |
| to the corresponding functions in `libc`. |
| */</span> |
| |
| <span class="attribute">#<span class="op">!</span>[<span class="ident">deny</span>(<span class="ident">missing_docs</span>)]</span> |
| <span class="attribute">#<span class="op">!</span>[<span class="ident">allow</span>(<span class="ident">unused_imports</span>)]</span> |
| |
| <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">libc</span>; |
| |
| <span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">c_void</span>; |
| <span class="kw">use</span> <span class="ident">libc</span>::{<span class="ident">c_int</span>, <span class="ident">size_t</span>}; |
| |
| <span class="kw">const</span> <span class="ident">LO_U64</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0x0101010101010101</span>; |
| <span class="kw">const</span> <span class="ident">HI_U64</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0x8080808080808080</span>; |
| |
| <span class="comment">// use truncation</span> |
| <span class="kw">const</span> <span class="ident">LO_USIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">LO_U64</span> <span class="kw">as</span> <span class="ident">usize</span>; |
| <span class="kw">const</span> <span class="ident">HI_USIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">HI_U64</span> <span class="kw">as</span> <span class="ident">usize</span>; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"32"</span>)]</span> |
| <span class="kw">const</span> <span class="ident">USIZE_BYTES</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">4</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)]</span> |
| <span class="kw">const</span> <span class="ident">USIZE_BYTES</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">8</span>; |
| |
| <span class="doccomment">/// Return `true` if `x` contains any zero byte.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// From *Matters Computational*, J. Arndt</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// "The idea is to subtract one from each of the bytes and then look for</span> |
| <span class="doccomment">/// bytes where the borrow propagated all the way to the most significant</span> |
| <span class="doccomment">/// bit."</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">contains_zero_byte</span>(<span class="ident">x</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="ident">x</span>.<span class="ident">wrapping_sub</span>(<span class="ident">LO_USIZE</span>) <span class="op">&</span> <span class="op">!</span><span class="ident">x</span> <span class="op">&</span> <span class="ident">HI_USIZE</span> <span class="op">!=</span> <span class="number">0</span> |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"32"</span>)]</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">repeat_byte</span>(<span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rep</span> <span class="op">=</span> (<span class="ident">b</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op"><<</span> <span class="number">8</span> <span class="op">|</span> <span class="ident">b</span> <span class="kw">as</span> <span class="ident">usize</span>; |
| <span class="ident">rep</span> <span class="op">=</span> <span class="ident">rep</span> <span class="op"><<</span> <span class="number">16</span> <span class="op">|</span> <span class="ident">rep</span>; |
| <span class="ident">rep</span> |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)]</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">repeat_byte</span>(<span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rep</span> <span class="op">=</span> (<span class="ident">b</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op"><<</span> <span class="number">8</span> <span class="op">|</span> <span class="ident">b</span> <span class="kw">as</span> <span class="ident">usize</span>; |
| <span class="ident">rep</span> <span class="op">=</span> <span class="ident">rep</span> <span class="op"><<</span> <span class="number">16</span> <span class="op">|</span> <span class="ident">rep</span>; |
| <span class="ident">rep</span> <span class="op">=</span> <span class="ident">rep</span> <span class="op"><<</span> <span class="number">32</span> <span class="op">|</span> <span class="ident">rep</span>; |
| <span class="ident">rep</span> |
| } |
| |
| <span class="doccomment">/// A safe interface to `memchr`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Returns the index corresponding to the first occurrence of `needle` in</span> |
| <span class="doccomment">/// `haystack`, or `None` if one is not found.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// memchr reduces to super-optimized machine code at around an order of</span> |
| <span class="doccomment">/// magnitude faster than `haystack.iter().position(|&b| b == needle)`.</span> |
| <span class="doccomment">/// (See benchmarks.)</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This shows how to find the first position of a byte in a byte string.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```rust</span> |
| <span class="doccomment">/// use memchr::memchr;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let haystack = b"the quick brown fox";</span> |
| <span class="doccomment">/// assert_eq!(memchr(b'k', haystack), Some(8));</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span> <span class="comment">// reduces constant overhead</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">memchr</span>(<span class="ident">needle</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="comment">// libc memchr</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"windows"</span>), |
| <span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"32"</span>, |
| <span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>))))]</span> |
| <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span> <span class="comment">// reduces constant overhead</span> |
| <span class="kw">fn</span> <span class="ident">memchr_specific</span>(<span class="ident">needle</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">memchr</span> <span class="kw">as</span> <span class="ident">libc_memchr</span>; |
| |
| <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="kw">unsafe</span> { |
| <span class="ident">libc_memchr</span>( |
| <span class="ident">haystack</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_void</span>, |
| <span class="ident">needle</span> <span class="kw">as</span> <span class="ident">c_int</span>, |
| <span class="ident">haystack</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>) |
| }; |
| <span class="kw">if</span> <span class="ident">p</span>.<span class="ident">is_null</span>() { |
| <span class="prelude-val">None</span> |
| } <span class="kw">else</span> { |
| <span class="prelude-val">Some</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> (<span class="ident">haystack</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">usize</span>)) |
| } |
| } |
| |
| <span class="comment">// use fallback on windows, since it's faster</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"windows"</span>, |
| <span class="ident">any</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"32"</span>, |
| <span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)))]</span> |
| <span class="kw">fn</span> <span class="ident">memchr_specific</span>(<span class="ident">needle</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="ident">fallback</span>::<span class="ident">memchr</span>(<span class="ident">needle</span>, <span class="ident">haystack</span>) |
| } |
| |
| <span class="ident">memchr_specific</span>(<span class="ident">needle</span>, <span class="ident">haystack</span>) |
| } |
| |
| <span class="doccomment">/// A safe interface to `memrchr`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Returns the index corresponding to the last occurrence of `needle` in</span> |
| <span class="doccomment">/// `haystack`, or `None` if one is not found.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This shows how to find the last position of a byte in a byte string.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```rust</span> |
| <span class="doccomment">/// use memchr::memrchr;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let haystack = b"the quick brown fox";</span> |
| <span class="doccomment">/// assert_eq!(memrchr(b'o', haystack), Some(17));</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span> <span class="comment">// reduces constant overhead</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">memrchr</span>(<span class="ident">needle</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>)]</span> |
| <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span> <span class="comment">// reduces constant overhead</span> |
| <span class="kw">fn</span> <span class="ident">memrchr_specific</span>(<span class="ident">needle</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="comment">// GNU's memrchr() will - unlike memchr() - error if haystack is empty.</span> |
| <span class="kw">if</span> <span class="ident">haystack</span>.<span class="ident">is_empty</span>() {<span class="kw">return</span> <span class="prelude-val">None</span>} |
| <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="kw">unsafe</span> { |
| <span class="ident">libc</span>::<span class="ident">memrchr</span>( |
| <span class="ident">haystack</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_void</span>, |
| <span class="ident">needle</span> <span class="kw">as</span> <span class="ident">c_int</span>, |
| <span class="ident">haystack</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">size_t</span>) |
| }; |
| <span class="kw">if</span> <span class="ident">p</span>.<span class="ident">is_null</span>() { |
| <span class="prelude-val">None</span> |
| } <span class="kw">else</span> { |
| <span class="prelude-val">Some</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> (<span class="ident">haystack</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">usize</span>)) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>), |
| <span class="ident">any</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"32"</span>, <span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)))]</span> |
| <span class="kw">fn</span> <span class="ident">memrchr_specific</span>(<span class="ident">needle</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="ident">fallback</span>::<span class="ident">memrchr</span>(<span class="ident">needle</span>, <span class="ident">haystack</span>) |
| } |
| |
| <span class="comment">// For the rare case of neither 32 bit nor 64-bit platform.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>), |
| <span class="ident">not</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"32"</span>), |
| <span class="ident">not</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)))]</span> |
| <span class="kw">fn</span> <span class="ident">memrchr_specific</span>(<span class="ident">needle</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="ident">haystack</span>.<span class="ident">iter</span>().<span class="ident">rposition</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">needle</span>) |
| } |
| |
| <span class="ident">memrchr_specific</span>(<span class="ident">needle</span>, <span class="ident">haystack</span>) |
| } |
| |
| <span class="doccomment">/// Like `memchr`, but searches for two bytes instead of one.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">memchr2</span>(<span class="ident">needle1</span>: <span class="ident">u8</span>, <span class="ident">needle2</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>; |
| |
| <span class="kw">fn</span> <span class="ident">slow</span>(<span class="ident">b1</span>: <span class="ident">u8</span>, <span class="ident">b2</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="ident">haystack</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">b1</span> <span class="op">||</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">b2</span>) |
| } |
| |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">haystack</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">haystack</span>.<span class="ident">as_ptr</span>(); |
| <span class="kw">let</span> <span class="ident">align</span> <span class="op">=</span> (<span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">&</span> (<span class="ident">USIZE_BYTES</span> <span class="op">-</span> <span class="number">1</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="kw">if</span> <span class="ident">align</span> <span class="op">></span> <span class="number">0</span> { |
| <span class="ident">i</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">USIZE_BYTES</span> <span class="op">-</span> <span class="ident">align</span>, <span class="ident">len</span>); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">found</span>) <span class="op">=</span> <span class="ident">slow</span>(<span class="ident">needle1</span>, <span class="ident">needle2</span>, <span class="kw-2">&</span><span class="ident">haystack</span>[..<span class="ident">i</span>]) { |
| <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">found</span>); |
| } |
| } |
| <span class="kw">let</span> <span class="ident">repeated_b1</span> <span class="op">=</span> <span class="ident">repeat_byte</span>(<span class="ident">needle1</span>); |
| <span class="kw">let</span> <span class="ident">repeated_b2</span> <span class="op">=</span> <span class="ident">repeat_byte</span>(<span class="ident">needle2</span>); |
| <span class="kw">if</span> <span class="ident">len</span> <span class="op">>=</span> <span class="ident">USIZE_BYTES</span> { |
| <span class="kw">while</span> <span class="ident">i</span> <span class="op"><=</span> <span class="ident">len</span> <span class="op">-</span> <span class="ident">USIZE_BYTES</span> { |
| <span class="kw">unsafe</span> { |
| <span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="kw-2">*</span>(<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span>); |
| <span class="kw">let</span> <span class="ident">found_ub1</span> <span class="op">=</span> <span class="ident">contains_zero_byte</span>(<span class="ident">u</span> <span class="op">^</span> <span class="ident">repeated_b1</span>); |
| <span class="kw">let</span> <span class="ident">found_ub2</span> <span class="op">=</span> <span class="ident">contains_zero_byte</span>(<span class="ident">u</span> <span class="op">^</span> <span class="ident">repeated_b2</span>); |
| <span class="kw">if</span> <span class="ident">found_ub1</span> <span class="op">||</span> <span class="ident">found_ub2</span> { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="ident">i</span> <span class="op">+=</span> <span class="ident">USIZE_BYTES</span>; |
| } |
| } |
| <span class="ident">slow</span>(<span class="ident">needle1</span>, <span class="ident">needle2</span>, <span class="kw-2">&</span><span class="ident">haystack</span>[<span class="ident">i</span>..]).<span class="ident">map</span>(<span class="op">|</span><span class="ident">pos</span><span class="op">|</span> <span class="ident">i</span> <span class="op">+</span> <span class="ident">pos</span>) |
| } |
| |
| <span class="doccomment">/// Like `memchr`, but searches for three bytes instead of one.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">memchr3</span>( |
| <span class="ident">needle1</span>: <span class="ident">u8</span>, |
| <span class="ident">needle2</span>: <span class="ident">u8</span>, |
| <span class="ident">needle3</span>: <span class="ident">u8</span>, |
| <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>], |
| ) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>; |
| |
| <span class="kw">fn</span> <span class="ident">slow</span>(<span class="ident">b1</span>: <span class="ident">u8</span>, <span class="ident">b2</span>: <span class="ident">u8</span>, <span class="ident">b3</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="ident">haystack</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">b1</span> <span class="op">||</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">b2</span> <span class="op">||</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">b3</span>) |
| } |
| |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">haystack</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">haystack</span>.<span class="ident">as_ptr</span>(); |
| <span class="kw">let</span> <span class="ident">align</span> <span class="op">=</span> (<span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">&</span> (<span class="ident">USIZE_BYTES</span> <span class="op">-</span> <span class="number">1</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>; |
| <span class="kw">if</span> <span class="ident">align</span> <span class="op">></span> <span class="number">0</span> { |
| <span class="ident">i</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">USIZE_BYTES</span> <span class="op">-</span> <span class="ident">align</span>, <span class="ident">len</span>); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">found</span>) <span class="op">=</span> <span class="ident">slow</span>(<span class="ident">needle1</span>, <span class="ident">needle2</span>, <span class="ident">needle3</span>, <span class="kw-2">&</span><span class="ident">haystack</span>[..<span class="ident">i</span>]) { |
| <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">found</span>); |
| } |
| } |
| <span class="kw">let</span> <span class="ident">repeated_b1</span> <span class="op">=</span> <span class="ident">repeat_byte</span>(<span class="ident">needle1</span>); |
| <span class="kw">let</span> <span class="ident">repeated_b2</span> <span class="op">=</span> <span class="ident">repeat_byte</span>(<span class="ident">needle2</span>); |
| <span class="kw">let</span> <span class="ident">repeated_b3</span> <span class="op">=</span> <span class="ident">repeat_byte</span>(<span class="ident">needle3</span>); |
| <span class="kw">if</span> <span class="ident">len</span> <span class="op">>=</span> <span class="ident">USIZE_BYTES</span> { |
| <span class="kw">while</span> <span class="ident">i</span> <span class="op"><=</span> <span class="ident">len</span> <span class="op">-</span> <span class="ident">USIZE_BYTES</span> { |
| <span class="kw">unsafe</span> { |
| <span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="kw-2">*</span>(<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span>); |
| <span class="kw">let</span> <span class="ident">found_ub1</span> <span class="op">=</span> <span class="ident">contains_zero_byte</span>(<span class="ident">u</span> <span class="op">^</span> <span class="ident">repeated_b1</span>); |
| <span class="kw">let</span> <span class="ident">found_ub2</span> <span class="op">=</span> <span class="ident">contains_zero_byte</span>(<span class="ident">u</span> <span class="op">^</span> <span class="ident">repeated_b2</span>); |
| <span class="kw">let</span> <span class="ident">found_ub3</span> <span class="op">=</span> <span class="ident">contains_zero_byte</span>(<span class="ident">u</span> <span class="op">^</span> <span class="ident">repeated_b3</span>); |
| <span class="kw">if</span> <span class="ident">found_ub1</span> <span class="op">||</span> <span class="ident">found_ub2</span> <span class="op">||</span> <span class="ident">found_ub3</span> { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="ident">i</span> <span class="op">+=</span> <span class="ident">USIZE_BYTES</span>; |
| } |
| } |
| <span class="ident">slow</span>(<span class="ident">needle1</span>, <span class="ident">needle2</span>, <span class="ident">needle3</span>, <span class="kw-2">&</span><span class="ident">haystack</span>[<span class="ident">i</span>..]).<span class="ident">map</span>(<span class="op">|</span><span class="ident">pos</span><span class="op">|</span> <span class="ident">i</span> <span class="op">+</span> <span class="ident">pos</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>), |
| <span class="ident">any</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"32"</span>, <span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)))]</span> |
| <span class="kw">mod</span> <span class="ident">fallback</span> { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>; |
| <span class="kw">use</span> <span class="kw">super</span>::{ |
| <span class="ident">LO_U64</span>, <span class="ident">HI_U64</span>, <span class="ident">LO_USIZE</span>, <span class="ident">HI_USIZE</span>, <span class="ident">USIZE_BYTES</span>, |
| <span class="ident">contains_zero_byte</span>, <span class="ident">repeat_byte</span>, |
| }; |
| |
| <span class="doccomment">/// Return the first index matching the byte `a` in `text`.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">memchr</span>(<span class="ident">x</span>: <span class="ident">u8</span>, <span class="ident">text</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="comment">// Scan for a single byte value by reading two `usize` words at a time.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Split `text` in three parts</span> |
| <span class="comment">// - unaligned inital part, before the first word aligned address in text</span> |
| <span class="comment">// - body, scan by 2 words at a time</span> |
| <span class="comment">// - the last remaining part, < 2 word size</span> |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">as_ptr</span>(); |
| |
| <span class="comment">// search up to an aligned boundary</span> |
| <span class="kw">let</span> <span class="ident">align</span> <span class="op">=</span> (<span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">&</span> (<span class="ident">USIZE_BYTES</span> <span class="op">-</span> <span class="number">1</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">offset</span>; |
| <span class="kw">if</span> <span class="ident">align</span> <span class="op">></span> <span class="number">0</span> { |
| <span class="ident">offset</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">USIZE_BYTES</span> <span class="op">-</span> <span class="ident">align</span>, <span class="ident">len</span>); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">index</span>) <span class="op">=</span> <span class="ident">text</span>[..<span class="ident">offset</span>].<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">elt</span> <span class="op">==</span> <span class="ident">x</span>) { |
| <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">index</span>); |
| } |
| } <span class="kw">else</span> { |
| <span class="ident">offset</span> <span class="op">=</span> <span class="number">0</span>; |
| } |
| |
| <span class="comment">// search the body of the text</span> |
| <span class="kw">let</span> <span class="ident">repeated_x</span> <span class="op">=</span> <span class="ident">repeat_byte</span>(<span class="ident">x</span>); |
| |
| <span class="kw">if</span> <span class="ident">len</span> <span class="op">>=</span> <span class="number">2</span> <span class="op">*</span> <span class="ident">USIZE_BYTES</span> { |
| <span class="kw">while</span> <span class="ident">offset</span> <span class="op"><=</span> <span class="ident">len</span> <span class="op">-</span> <span class="number">2</span> <span class="op">*</span> <span class="ident">USIZE_BYTES</span> { |
| <span class="kw">unsafe</span> { |
| <span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="kw-2">*</span>(<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="ident">offset</span> <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span>); |
| <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="kw-2">*</span>(<span class="ident">ptr</span>.<span class="ident">offset</span>((<span class="ident">offset</span> <span class="op">+</span> <span class="ident">USIZE_BYTES</span>) <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span>); |
| |
| <span class="comment">// break if there is a matching byte</span> |
| <span class="kw">let</span> <span class="ident">zu</span> <span class="op">=</span> <span class="ident">contains_zero_byte</span>(<span class="ident">u</span> <span class="op">^</span> <span class="ident">repeated_x</span>); |
| <span class="kw">let</span> <span class="ident">zv</span> <span class="op">=</span> <span class="ident">contains_zero_byte</span>(<span class="ident">v</span> <span class="op">^</span> <span class="ident">repeated_x</span>); |
| <span class="kw">if</span> <span class="ident">zu</span> <span class="op">||</span> <span class="ident">zv</span> { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="ident">offset</span> <span class="op">+=</span> <span class="ident">USIZE_BYTES</span> <span class="op">*</span> <span class="number">2</span>; |
| } |
| } |
| |
| <span class="comment">// find the byte after the point the body loop stopped</span> |
| <span class="ident">text</span>[<span class="ident">offset</span>..].<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">elt</span> <span class="op">==</span> <span class="ident">x</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">offset</span> <span class="op">+</span> <span class="ident">i</span>) |
| } |
| |
| <span class="doccomment">/// Return the last index matching the byte `a` in `text`.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">memrchr</span>(<span class="ident">x</span>: <span class="ident">u8</span>, <span class="ident">text</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { |
| <span class="comment">// Scan for a single byte value by reading two `usize` words at a time.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Split `text` in three parts</span> |
| <span class="comment">// - unaligned tail, after the last word aligned address in text</span> |
| <span class="comment">// - body, scan by 2 words at a time</span> |
| <span class="comment">// - the first remaining bytes, < 2 word size</span> |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">len</span>(); |
| <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">text</span>.<span class="ident">as_ptr</span>(); |
| |
| <span class="comment">// search to an aligned boundary</span> |
| <span class="kw">let</span> <span class="ident">end_align</span> <span class="op">=</span> (<span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="ident">len</span>) <span class="op">&</span> (<span class="ident">USIZE_BYTES</span> <span class="op">-</span> <span class="number">1</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">offset</span>; |
| <span class="kw">if</span> <span class="ident">end_align</span> <span class="op">></span> <span class="number">0</span> { |
| <span class="ident">offset</span> <span class="op">=</span> <span class="ident">len</span> <span class="op">-</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">USIZE_BYTES</span> <span class="op">-</span> <span class="ident">end_align</span>, <span class="ident">len</span>); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">index</span>) <span class="op">=</span> <span class="ident">text</span>[<span class="ident">offset</span>..].<span class="ident">iter</span>().<span class="ident">rposition</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">elt</span> <span class="op">==</span> <span class="ident">x</span>) { |
| <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">offset</span> <span class="op">+</span> <span class="ident">index</span>); |
| } |
| } <span class="kw">else</span> { |
| <span class="ident">offset</span> <span class="op">=</span> <span class="ident">len</span>; |
| } |
| |
| <span class="comment">// search the body of the text</span> |
| <span class="kw">let</span> <span class="ident">repeated_x</span> <span class="op">=</span> <span class="ident">repeat_byte</span>(<span class="ident">x</span>); |
| |
| <span class="kw">while</span> <span class="ident">offset</span> <span class="op">>=</span> <span class="number">2</span> <span class="op">*</span> <span class="ident">USIZE_BYTES</span> { |
| <span class="kw">unsafe</span> { |
| <span class="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="kw-2">*</span>(<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="ident">offset</span> <span class="kw">as</span> <span class="ident">isize</span> <span class="op">-</span> <span class="number">2</span> <span class="op">*</span> <span class="ident">USIZE_BYTES</span> <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span>); |
| <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="kw-2">*</span>(<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="ident">offset</span> <span class="kw">as</span> <span class="ident">isize</span> <span class="op">-</span> <span class="ident">USIZE_BYTES</span> <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span>); |
| |
| <span class="comment">// break if there is a matching byte</span> |
| <span class="kw">let</span> <span class="ident">zu</span> <span class="op">=</span> <span class="ident">contains_zero_byte</span>(<span class="ident">u</span> <span class="op">^</span> <span class="ident">repeated_x</span>); |
| <span class="kw">let</span> <span class="ident">zv</span> <span class="op">=</span> <span class="ident">contains_zero_byte</span>(<span class="ident">v</span> <span class="op">^</span> <span class="ident">repeated_x</span>); |
| <span class="kw">if</span> <span class="ident">zu</span> <span class="op">||</span> <span class="ident">zv</span> { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="ident">offset</span> <span class="op">-=</span> <span class="number">2</span> <span class="op">*</span> <span class="ident">USIZE_BYTES</span>; |
| } |
| |
| <span class="comment">// find the byte before the point the body loop stopped</span> |
| <span class="ident">text</span>[..<span class="ident">offset</span>].<span class="ident">iter</span>().<span class="ident">rposition</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">elt</span> <span class="op">==</span> <span class="ident">x</span>) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">tests</span> { |
| <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">quickcheck</span>; |
| |
| <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">memchr</span>, <span class="ident">memrchr</span>, <span class="ident">memchr2</span>, <span class="ident">memchr3</span>}; |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_one</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr</span>(<span class="string">b'a'</span>, <span class="string">b"a"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_begin</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr</span>(<span class="string">b'a'</span>, <span class="string">b"aaaa"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_end</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr</span>(<span class="string">b'z'</span>, <span class="string">b"aaaaz"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_nul</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr</span>(<span class="string">b'\x00'</span>, <span class="string">b"aaaa\x00"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_past_nul</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">5</span>), <span class="ident">memchr</span>(<span class="string">b'z'</span>, <span class="string">b"aaaa\x00z"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">no_match_empty</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memchr</span>(<span class="string">b'a'</span>, <span class="string">b""</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">no_match</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memchr</span>(<span class="string">b'a'</span>, <span class="string">b"xyz"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">qc_never_fail</span>() { |
| <span class="kw">fn</span> <span class="ident">prop</span>(<span class="ident">needle</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="ident">memchr</span>(<span class="ident">needle</span>, <span class="kw-2">&</span><span class="ident">haystack</span>); <span class="bool-val">true</span> |
| } |
| <span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">prop</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">u8</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_one_reversed</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memrchr</span>(<span class="string">b'a'</span>, <span class="string">b"a"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_begin_reversed</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">3</span>), <span class="ident">memrchr</span>(<span class="string">b'a'</span>, <span class="string">b"aaaa"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_end_reversed</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memrchr</span>(<span class="string">b'z'</span>, <span class="string">b"zaaaa"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_nul_reversed</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memrchr</span>(<span class="string">b'\x00'</span>, <span class="string">b"aaaa\x00"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">matches_past_nul_reversed</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memrchr</span>(<span class="string">b'z'</span>, <span class="string">b"z\x00aaaa"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">no_match_empty_reversed</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memrchr</span>(<span class="string">b'a'</span>, <span class="string">b""</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">no_match_reversed</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memrchr</span>(<span class="string">b'a'</span>, <span class="string">b"xyz"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">qc_never_fail_reversed</span>() { |
| <span class="kw">fn</span> <span class="ident">prop</span>(<span class="ident">needle</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="ident">memrchr</span>(<span class="ident">needle</span>, <span class="kw-2">&</span><span class="ident">haystack</span>); <span class="bool-val">true</span> |
| } |
| <span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">prop</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">u8</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr2_matches_one</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr2</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b"a"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr2</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b"b"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr2</span>(<span class="string">b'b'</span>, <span class="string">b'a'</span>, <span class="string">b"a"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr2</span>(<span class="string">b'b'</span>, <span class="string">b'a'</span>, <span class="string">b"b"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr2_matches_begin</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr2</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b"aaaa"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr2</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b"bbbb"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr2_matches_end</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr2</span>(<span class="string">b'z'</span>, <span class="string">b'y'</span>, <span class="string">b"aaaaz"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr2</span>(<span class="string">b'z'</span>, <span class="string">b'y'</span>, <span class="string">b"aaaay"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr2_matches_nul</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr2</span>(<span class="string">b'\x00'</span>, <span class="string">b'z'</span>, <span class="string">b"aaaa\x00"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr2</span>(<span class="string">b'z'</span>, <span class="string">b'\x00'</span>, <span class="string">b"aaaa\x00"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr2_matches_past_nul</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">5</span>), <span class="ident">memchr2</span>(<span class="string">b'z'</span>, <span class="string">b'y'</span>, <span class="string">b"aaaa\x00z"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">5</span>), <span class="ident">memchr2</span>(<span class="string">b'y'</span>, <span class="string">b'z'</span>, <span class="string">b"aaaa\x00z"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr2_no_match_empty</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memchr2</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b""</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memchr2</span>(<span class="string">b'b'</span>, <span class="string">b'a'</span>, <span class="string">b""</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr2_no_match</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memchr2</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b"xyz"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">qc_never_fail_memchr2</span>() { |
| <span class="kw">fn</span> <span class="ident">prop</span>(<span class="ident">needle1</span>: <span class="ident">u8</span>, <span class="ident">needle2</span>: <span class="ident">u8</span>, <span class="ident">haystack</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="ident">memchr2</span>(<span class="ident">needle1</span>, <span class="ident">needle2</span>, <span class="kw-2">&</span><span class="ident">haystack</span>); <span class="bool-val">true</span> |
| } |
| <span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">prop</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">u8</span>, <span class="ident">u8</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr3_matches_one</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr3</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b'c'</span>, <span class="string">b"a"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr3</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b'c'</span>, <span class="string">b"b"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr3</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b'c'</span>, <span class="string">b"c"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr3_matches_begin</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr3</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b'c'</span>, <span class="string">b"aaaa"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr3</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b'c'</span>, <span class="string">b"bbbb"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memchr3</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b'c'</span>, <span class="string">b"cccc"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr3_matches_end</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr3</span>(<span class="string">b'z'</span>, <span class="string">b'y'</span>, <span class="string">b'x'</span>, <span class="string">b"aaaaz"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr3</span>(<span class="string">b'z'</span>, <span class="string">b'y'</span>, <span class="string">b'x'</span>, <span class="string">b"aaaay"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr3</span>(<span class="string">b'z'</span>, <span class="string">b'y'</span>, <span class="string">b'x'</span>, <span class="string">b"aaaax"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr3_matches_nul</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr3</span>(<span class="string">b'\x00'</span>, <span class="string">b'z'</span>, <span class="string">b'y'</span>, <span class="string">b"aaaa\x00"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr3</span>(<span class="string">b'z'</span>, <span class="string">b'\x00'</span>, <span class="string">b'y'</span>, <span class="string">b"aaaa\x00"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">memchr3</span>(<span class="string">b'z'</span>, <span class="string">b'y'</span>, <span class="string">b'\x00'</span>, <span class="string">b"aaaa\x00"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr3_matches_past_nul</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">5</span>), <span class="ident">memchr3</span>(<span class="string">b'z'</span>, <span class="string">b'y'</span>, <span class="string">b'x'</span>, <span class="string">b"aaaa\x00z"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">5</span>), <span class="ident">memchr3</span>(<span class="string">b'y'</span>, <span class="string">b'z'</span>, <span class="string">b'x'</span>, <span class="string">b"aaaa\x00z"</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">5</span>), <span class="ident">memchr3</span>(<span class="string">b'y'</span>, <span class="string">b'x'</span>, <span class="string">b'z'</span>, <span class="string">b"aaaa\x00z"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr3_no_match_empty</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memchr3</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b'c'</span>, <span class="string">b""</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memchr3</span>(<span class="string">b'b'</span>, <span class="string">b'a'</span>, <span class="string">b'c'</span>, <span class="string">b""</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memchr3</span>(<span class="string">b'c'</span>, <span class="string">b'b'</span>, <span class="string">b'a'</span>, <span class="string">b""</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">memchr3_no_match</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">memchr3</span>(<span class="string">b'a'</span>, <span class="string">b'b'</span>, <span class="string">b'c'</span>, <span class="string">b"xyz"</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">qc_never_fail_memchr3</span>() { |
| <span class="kw">fn</span> <span class="ident">prop</span>( |
| <span class="ident">needle1</span>: <span class="ident">u8</span>, |
| <span class="ident">needle2</span>: <span class="ident">u8</span>, |
| <span class="ident">needle3</span>: <span class="ident">u8</span>, |
| <span class="ident">haystack</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, |
| ) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="ident">memchr3</span>(<span class="ident">needle1</span>, <span class="ident">needle2</span>, <span class="ident">needle3</span>, <span class="kw-2">&</span><span class="ident">haystack</span>); <span class="bool-val">true</span> |
| } |
| <span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">prop</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">u8</span>, <span class="ident">u8</span>, <span class="ident">u8</span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">qc_correct_memchr</span>() { |
| <span class="kw">fn</span> <span class="ident">prop</span>(<span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">offset</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="comment">// test all pointer alignments</span> |
| <span class="kw">let</span> <span class="ident">uoffset</span> <span class="op">=</span> (<span class="ident">offset</span> <span class="op">&</span> <span class="number">0xF</span>) <span class="kw">as</span> <span class="ident">usize</span>; |
| <span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">uoffset</span> <span class="op"><=</span> <span class="ident">v</span>.<span class="ident">len</span>() { |
| <span class="kw-2">&</span><span class="ident">v</span>[<span class="ident">uoffset</span>..] |
| } <span class="kw">else</span> { |
| <span class="kw-2">&</span><span class="ident">v</span>[..] |
| }; |
| <span class="kw">for</span> <span class="ident">byte</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">256u32</span> { |
| <span class="kw">let</span> <span class="ident">byte</span> <span class="op">=</span> <span class="ident">byte</span> <span class="kw">as</span> <span class="ident">u8</span>; |
| <span class="kw">if</span> <span class="ident">memchr</span>(<span class="ident">byte</span>, <span class="kw-2">&</span><span class="ident">data</span>) <span class="op">!=</span> <span class="ident">data</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">elt</span> <span class="op">==</span> <span class="ident">byte</span>) { |
| <span class="kw">return</span> <span class="bool-val">false</span>; |
| } |
| } |
| <span class="bool-val">true</span> |
| } |
| <span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">prop</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">qc_correct_memrchr</span>() { |
| <span class="kw">fn</span> <span class="ident">prop</span>(<span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">offset</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="comment">// test all pointer alignments</span> |
| <span class="kw">let</span> <span class="ident">uoffset</span> <span class="op">=</span> (<span class="ident">offset</span> <span class="op">&</span> <span class="number">0xF</span>) <span class="kw">as</span> <span class="ident">usize</span>; |
| <span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">uoffset</span> <span class="op"><=</span> <span class="ident">v</span>.<span class="ident">len</span>() { |
| <span class="kw-2">&</span><span class="ident">v</span>[<span class="ident">uoffset</span>..] |
| } <span class="kw">else</span> { |
| <span class="kw-2">&</span><span class="ident">v</span>[..] |
| }; |
| <span class="kw">for</span> <span class="ident">byte</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">256u32</span> { |
| <span class="kw">let</span> <span class="ident">byte</span> <span class="op">=</span> <span class="ident">byte</span> <span class="kw">as</span> <span class="ident">u8</span>; |
| <span class="kw">if</span> <span class="ident">memrchr</span>(<span class="ident">byte</span>, <span class="kw-2">&</span><span class="ident">data</span>) <span class="op">!=</span> <span class="ident">data</span>.<span class="ident">iter</span>().<span class="ident">rposition</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">elt</span> <span class="op">==</span> <span class="ident">byte</span>) { |
| <span class="kw">return</span> <span class="bool-val">false</span>; |
| } |
| } |
| <span class="bool-val">true</span> |
| } |
| <span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">prop</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">qc_correct_memchr2</span>() { |
| <span class="kw">fn</span> <span class="ident">prop</span>(<span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">offset</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="comment">// test all pointer alignments</span> |
| <span class="kw">let</span> <span class="ident">uoffset</span> <span class="op">=</span> (<span class="ident">offset</span> <span class="op">&</span> <span class="number">0xF</span>) <span class="kw">as</span> <span class="ident">usize</span>; |
| <span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">uoffset</span> <span class="op"><=</span> <span class="ident">v</span>.<span class="ident">len</span>() { |
| <span class="kw-2">&</span><span class="ident">v</span>[<span class="ident">uoffset</span>..] |
| } <span class="kw">else</span> { |
| <span class="kw-2">&</span><span class="ident">v</span>[..] |
| }; |
| <span class="kw">for</span> <span class="ident">b1</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">256u32</span> { |
| <span class="kw">for</span> <span class="ident">b2</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">256u32</span> { |
| <span class="kw">let</span> (<span class="ident">b1</span>, <span class="ident">b2</span>) <span class="op">=</span> (<span class="ident">b1</span> <span class="kw">as</span> <span class="ident">u8</span>, <span class="ident">b2</span> <span class="kw">as</span> <span class="ident">u8</span>); |
| <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> |
| <span class="ident">data</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">b1</span> <span class="op">||</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">b2</span>); |
| <span class="kw">let</span> <span class="ident">got</span> <span class="op">=</span> <span class="ident">memchr2</span>(<span class="ident">b1</span>, <span class="ident">b2</span>, <span class="kw-2">&</span><span class="ident">data</span>); |
| <span class="kw">if</span> <span class="ident">expected</span> <span class="op">!=</span> <span class="ident">got</span> { |
| <span class="kw">return</span> <span class="bool-val">false</span>; |
| } |
| } |
| } |
| <span class="bool-val">true</span> |
| } |
| <span class="ident">quickcheck</span>::<span class="ident">quickcheck</span>(<span class="ident">prop</span> <span class="kw">as</span> <span class="kw">fn</span>(<span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>, <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">bool</span>); |
| } |
| } |
| </pre> |
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