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author: 2015-06-29 20:16:15 +0000
committer: 2015-06-29 20:16:15 +0000
commit: 64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch)
tree: 8c64d6e8be006486d975a651505fbbde61365cd6 /src/memchr
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+    <section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span>
+<span id="2"> 2</span>
+<span id="3"> 3</span>
+<span id="4"> 4</span>
+<span id="5"> 5</span>
+<span id="6"> 6</span>
+<span id="7"> 7</span>
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+<span id="93">93</span>
+<span id="94">94</span>
+<span id="95">95</span>
+</pre><pre class='rust '>
+<span class='doccomment'>/*!
+This crate defines a single function, `memchr`, which exposes a safe interface
+to the corresponding function in `libc`.
+*/</span>
+
+<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>deny</span>(<span class='ident'>missing_docs</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'>funcs</span>::<span class='ident'>c95</span>::<span class='ident'>string</span>;
+<span class='kw'>use</span> <span class='ident'>libc</span>::<span class='ident'>types</span>::<span class='ident'>common</span>::<span class='ident'>c95</span>::<span class='ident'>c_void</span>;
+<span class='kw'>use</span> <span class='ident'>libc</span>::<span class='ident'>types</span>::<span class='ident'>os</span>::<span class='ident'>arch</span>::<span class='ident'>c95</span>::{<span class='ident'>c_int</span>, <span class='ident'>size_t</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(|&amp;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&quot;the quick brown fox&quot;;</span>
+<span class='doccomment'>/// assert_eq!(memchr(b&#39;k&#39;, haystack), Some(8));</span>
+<span class='doccomment'>/// ```</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'>&amp;</span>[<span class='ident'>u8</span>]) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>usize</span><span class='op'>&gt;</span> {
+    <span class='kw'>let</span> <span class='ident'>p</span> <span class='op'>=</span> <span class='kw'>unsafe</span> {
+        <span class='ident'>string</span>::<span class='ident'>memchr</span>(
+            <span class='ident'>haystack</span>.<span class='ident'>as_ptr</span>() <span class='kw'>as</span> <span class='op'>*</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'>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='ident'>super</span>::<span class='ident'>memchr</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&#39;a&#39;</span>, <span class='string'>b&quot;a&quot;</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&#39;a&#39;</span>, <span class='string'>b&quot;aaaa&quot;</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&#39;z&#39;</span>, <span class='string'>b&quot;aaaaz&quot;</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&#39;\x00&#39;</span>, <span class='string'>b&quot;aaaa\x00&quot;</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&#39;z&#39;</span>, <span class='string'>b&quot;aaaa\x00z&quot;</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&#39;a&#39;</span>, <span class='string'>b&quot;&quot;</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&#39;a&#39;</span>, <span class='string'>b&quot;xyz&quot;</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'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+            <span class='ident'>memchr</span>(<span class='ident'>needle</span>, <span class='kw-2'>&amp;</span><span class='ident'>haystack</span>); <span class='boolval'>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'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span>);
+    }
+}
+</pre>
+</section>
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author		2015-06-29 20:16:15 +0000
committer		2015-06-29 20:16:15 +0000
commit	64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch)
tree	8c64d6e8be006486d975a651505fbbde61365cd6 /src/memchr
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