80 lines
4.5 KiB
HTML
80 lines
4.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>Wide Strings</title>
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<meta name="viewport" content="width=device-width initial-scale=1">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta http-equiv="Content-Language" content="en-gb">
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<link href="../inweb.css" rel="stylesheet" rev="stylesheet" type="text/css">
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</head>
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<body>
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<nav role="navigation">
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<h1><a href="../webs.html">Sources</a></h1>
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<ul>
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<li><a href="../inweb/index.html">inweb</a></li>
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</ul>
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<h2>Foundation</h2>
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<ul>
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<li><a href="../foundation-module/index.html">foundation-module</a></li>
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<li><a href="../foundation-test/index.html">foundation-test</a></li>
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</ul>
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</nav>
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<main role="main">
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<!--Weave of 'Wide Strings' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">Source</a></li><li><a href="index.html">foundation</a></li><li><a href="index.html#4">Chapter 4: Text Handling</a></li><li><b>Wide Strings</b></li></ul><p class="purpose">A minimal library for handling wide C strings.</p>
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. </b>By "wide string", we mean an array of <code class="display"><span class="extract">wchar_t</span></code>. A pointer to this type
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is what is returned by an L-literal in ANSI C, such as <code class="display"><span class="extract">L"look, I'm wide"</span></code>.
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A wide string is essentially a C string but with characters stored in full
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words instead of bytes. The character values should be Unicode code points.
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</p>
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<p class="inwebparagraph">We will do as little as possible with wide strings, and the following
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wrappers simply abstract the standard C library's handling.
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</p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Wide::len</span><span class="plain">(</span><span class="identifier">wchar_t</span><span class="plain"> *</span><span class="identifier">p</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain">) </span><span class="identifier">wcslen</span><span class="plain">(</span><span class="identifier">p</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Wide::len is used in 4/taa (<a href="4-taa.html#SP2_3">§2.3</a>).</p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </b>On the rare occasions when we need to sort alphabetically we'll also call:
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</p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Wide::cmp</span><span class="plain">(</span><span class="identifier">wchar_t</span><span class="plain"> *</span><span class="identifier">A</span><span class="plain">, </span><span class="identifier">wchar_t</span><span class="plain"> *</span><span class="identifier">B</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">wcscmp</span><span class="plain">(</span><span class="identifier">A</span><span class="plain">, </span><span class="identifier">B</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Wide::cmp is used in 5/htm (<a href="5-htm.html#SP21">§21</a>).</p>
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<p class="inwebparagraph"><a id="SP3"></a><b>§3. </b></p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">Wide::atoi</span><span class="plain">(</span><span class="identifier">wchar_t</span><span class="plain"> *</span><span class="identifier">p</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain">) </span><span class="identifier">wcstol</span><span class="plain">(</span><span class="identifier">p</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">, </span><span class="constant">10</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Wide::atoi appears nowhere else.</p>
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<hr class="tocbar">
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<ul class="toc"><li><a href="4-cst.html">Back to 'C Strings'</a></li><li><a href="4-sm.html">Continue with 'String Manipulation'</a></li></ul><hr class="tocbar">
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<!--End of weave-->
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</main>
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</body>
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</html>
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