377 lines
53 KiB
HTML
377 lines
53 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>2/str</title>
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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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<main role="main">
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<!--Weave of '2/wal' 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#2">Chapter 2: Memory, Streams and Collections</a></li><li><b>Writers and Loggers</b></li></ul><p class="purpose">Formatted text output to streams.</p>
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<ul class="toc"><li><a href="#SP1">§1. Registration</a></li><li><a href="#SP6">§6. Writing</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Registration. </b>The main function here is modelled on the "minimum <code class="display"><span class="extract">printf</span></code>" function
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used as an example in Kernighan and Ritchie, Chapter 7, but because it
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prints to streams, it combines the traditional functions <code class="display"><span class="extract">printf</span></code>, <code class="display"><span class="extract">sprintf</span></code>
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and <code class="display"><span class="extract">fprintf</span></code> in one. It also contains a number of doohickeys to provide
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for a wider and extensible range of string interpolations.
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</p>
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<p class="inwebparagraph">Traditionally, in the C library, everything in the formatting string is
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literal except for <code class="display"><span class="extract">%</span></code> escapes: thus <code class="display"><span class="extract">%d</span></code> means "integer goes here", and
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so on. We follow this but allow extra <code class="display"><span class="extract">%</span></code> escapes unknown to K&R, and we
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also allow a further family of <code class="display"><span class="extract">$</span></code> escapes intended for the debugging log
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only; these are restricted to streams flagged as for debugging and generally
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produce guru meditation numbers rather than user-friendly information.
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</p>
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<p class="inwebparagraph">Each escape, say <code class="display"><span class="extract">%z</span></code>, must be "registered" before use, and will be
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given one of the following categories:
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</p>
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<pre class="definitions">
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<span class="definitionkeyword">define</span> <span class="constant">VACANT_ECAT</span><span class="plain"> 0 </span> <span class="comment">unregistered</span>
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<span class="definitionkeyword">define</span> <span class="constant">POINTER_ECAT</span><span class="plain"> 1 </span> <span class="comment">data to be printed is a pointer to a structure</span>
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<span class="definitionkeyword">define</span> <span class="constant">INTSIZED_ECAT</span><span class="plain"> 2 </span> <span class="comment">data to be printed is or fits into an integer</span>
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<span class="definitionkeyword">define</span> <span class="constant">WORDING_ECAT</span><span class="plain"> 3 </span> <span class="comment">data to be printed is a <code class="display"><span class="extract">wording</span></code> structure from inform7</span>
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<span class="definitionkeyword">define</span> <span class="constant">DIRECT_ECAT</span><span class="plain"> 4 </span> <span class="comment">data must be printed directly by the code below</span>
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</pre>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </b>We'll start with <code class="display"><span class="extract">%</span></code> escapes, which generalise the familiar <code class="display"><span class="extract">printf</span></code>
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escapes such as <code class="display"><span class="extract">%d</span></code>. Cumbersomely, we need three sorts of escape: those where
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the variable argument token is a pointer, those where it's essentially an
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integer, and those where it's a structure used only in the Inform 7 compiler
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called a <code class="display"><span class="extract">wording</span></code>. The standard C typechecker can't generalise across these,
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so we have to do everything three times. (And then we have to do all that twice,
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because the loggers don't use format strings.)
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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="identifier">escapes_registered</span><span class="plain"> = </span><span class="constant">FALSE</span><span class="plain">;</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">escapes_category</span><span class="plain">[2][128]; </span> <span class="comment">one of the <code class="display"><span class="extract">*_ECAT</span></code> values above</span>
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<span class="reserved">void</span><span class="plain"> *</span><span class="identifier">the_escapes</span><span class="plain">[2][128]; </span> <span class="comment">the function to call to implement this</span>
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<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">writer_function</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="reserved">char</span><span class="plain"> *, </span><span class="reserved">void</span><span class="plain"> *);</span>
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<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">writer_function_I</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="reserved">char</span><span class="plain"> *, </span><span class="reserved">int</span><span class="plain">);</span>
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<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">log_function</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="reserved">void</span><span class="plain"> *);</span>
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<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">log_function_I</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="reserved">int</span><span class="plain">);</span>
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<span class="plain">#</span><span class="identifier">ifdef</span><span class="plain"> </span><span class="identifier">WORDING_LOGS_ALLOWED</span>
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<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">writer_function_W</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="reserved">char</span><span class="plain"> *, </span><span class="identifier">wording</span><span class="plain">);</span>
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<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">log_function_W</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="identifier">wording</span><span class="plain">);</span>
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<span class="plain">#</span><span class="identifier">endif</span>
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</pre>
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<p class="inwebparagraph"></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">void</span><span class="plain"> </span><span class="functiontext">Writers::log_escape_usage</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">cat</span><span class="plain"> = 0; </span><span class="identifier">cat</span><span class="plain"> < 2; </span><span class="identifier">cat</span><span class="plain">++) {</span>
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<span class="reserved">char</span><span class="plain"> *</span><span class="identifier">alphanum</span><span class="plain"> = </span><span class="string">"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"</span><span class="plain">;</span>
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<span class="identifier">LOG</span><span class="plain">(</span><span class="string">"Vacant escapes: %s: "</span><span class="plain">, (</span><span class="identifier">cat</span><span class="plain"> == 0)?</span><span class="string">"%"</span><span class="plain">:</span><span class="string">"$"</span><span class="plain">);</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">i</span><span class="plain">=0; </span><span class="identifier">alphanum</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">]; </span><span class="identifier">i</span><span class="plain">++)</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">escapes_category</span><span class="plain">[</span><span class="identifier">cat</span><span class="plain">][(</span><span class="reserved">int</span><span class="plain">) </span><span class="identifier">alphanum</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">]] == </span><span class="constant">VACANT_ECAT</span><span class="plain">)</span>
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<span class="identifier">LOG</span><span class="plain">(</span><span class="string">"%c"</span><span class="plain">, </span><span class="identifier">alphanum</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">]);</span>
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<span class="reserved">else</span>
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<span class="identifier">LOG</span><span class="plain">(</span><span class="string">"."</span><span class="plain">);</span>
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<span class="identifier">LOG</span><span class="plain">(</span><span class="string">"\</span><span class="plain">n</span><span class="string">"</span><span class="plain">);</span>
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<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 Writers::log_escape_usage appears nowhere else.</p>
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<p class="inwebparagraph"><a id="SP4"></a><b>§4. </b>That gives us a number of front doors:
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</p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Writers::register_writer</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">esc</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">f</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="reserved">char</span><span class="plain"> *, </span><span class="reserved">void</span><span class="plain"> *)) {</span>
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<span class="functiontext">Writers::register_writer_p</span><span class="plain">(0, </span><span class="identifier">esc</span><span class="plain">, (</span><span class="reserved">void</span><span class="plain"> *) </span><span class="identifier">f</span><span class="plain">, </span><span class="constant">POINTER_ECAT</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Writers::register_logger</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">esc</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">f</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="reserved">void</span><span class="plain"> *)) {</span>
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<span class="functiontext">Writers::register_writer_p</span><span class="plain">(1, </span><span class="identifier">esc</span><span class="plain">, (</span><span class="reserved">void</span><span class="plain"> *) </span><span class="identifier">f</span><span class="plain">, </span><span class="constant">POINTER_ECAT</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Writers::register_writer_I</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">esc</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">f</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="reserved">char</span><span class="plain"> *, </span><span class="reserved">int</span><span class="plain">)) {</span>
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<span class="functiontext">Writers::register_writer_p</span><span class="plain">(0, </span><span class="identifier">esc</span><span class="plain">, (</span><span class="reserved">void</span><span class="plain"> *) </span><span class="identifier">f</span><span class="plain">, </span><span class="constant">INTSIZED_ECAT</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Writers::register_logger_I</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">esc</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> (*</span><span class="identifier">f</span><span class="plain">)(</span><span class="reserved">text_stream</span><span class="plain"> *, </span><span class="reserved">int</span><span class="plain">)) {</span>
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<span class="functiontext">Writers::register_writer_p</span><span class="plain">(1, </span><span class="identifier">esc</span><span class="plain">, (</span><span class="reserved">void</span><span class="plain"> *) </span><span class="identifier">f</span><span class="plain">, </span><span class="constant">INTSIZED_ECAT</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="plain">#</span><span class="identifier">ifdef</span><span class="plain"> </span><span class="identifier">WORDING_LOGS_ALLOWED</span>
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<span class="plain">#</span><span class="identifier">define</span><span class="plain"> </span><span class="identifier">Writers::register_writer_W</span><span class="plain">(</span><span class="identifier">esc</span><span class="plain">, </span><span class="identifier">f</span><span class="plain">) </span><span class="functiontext">Writers::register_writer_p</span><span class="plain">(0, </span><span class="identifier">esc</span><span class="plain">, (</span><span class="reserved">void</span><span class="plain"> *) </span><span class="identifier">f</span><span class="plain">, </span><span class="constant">WORDING_ECAT</span><span class="plain">);</span>
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<span class="plain">#</span><span class="identifier">define</span><span class="plain"> </span><span class="identifier">Writers::register_logger_W</span><span class="plain">(</span><span class="identifier">esc</span><span class="plain">, </span><span class="identifier">f</span><span class="plain">) </span><span class="functiontext">Writers::register_writer_p</span><span class="plain">(1, </span><span class="identifier">esc</span><span class="plain">, (</span><span class="reserved">void</span><span class="plain"> *) </span><span class="identifier">f</span><span class="plain">, </span><span class="constant">WORDING_ECAT</span><span class="plain">);</span>
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<span class="plain">#</span><span class="identifier">endif</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Writers::register_writer is used in 1/fnd (<a href="1-fnd.html#SP8_1">§8.1</a>).</p>
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<p class="endnote">The function Writers::register_logger is used in 1/fnd (<a href="1-fnd.html#SP8_3">§8.3</a>).</p>
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<p class="endnote">The function Writers::register_writer_I appears nowhere else.</p>
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<p class="endnote">The function Writers::register_logger_I appears nowhere else.</p>
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<p class="inwebparagraph"><a id="SP5"></a><b>§5. </b>All leading to:
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</p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Writers::register_writer_p</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">set</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">esc</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> *</span><span class="identifier">f</span><span class="plain">, </span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">cat</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">escapes_registered</span><span class="plain"> == </span><span class="constant">FALSE</span><span class="plain">) </span><<span class="cwebmacro">Initialise the table of escapes</span> <span class="cwebmacronumber">5.1</span>><span class="plain">;</span>
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<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">esc</span><span class="plain"> < 0) || (</span><span class="identifier">esc</span><span class="plain"> >= 128) ||</span>
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<span class="plain">((</span><span class="functiontext">Characters::isalpha</span><span class="plain">(</span><span class="identifier">esc</span><span class="plain">) == </span><span class="constant">FALSE</span><span class="plain">) && (</span><span class="functiontext">Characters::isdigit</span><span class="plain">(</span><span class="identifier">esc</span><span class="plain">) == </span><span class="constant">FALSE</span><span class="plain">)))</span>
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<span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"nonalphabetic escape"</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">escapes_category</span><span class="plain">[</span><span class="identifier">set</span><span class="plain">][</span><span class="identifier">esc</span><span class="plain">] != </span><span class="constant">VACANT_ECAT</span><span class="plain">) {</span>
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<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="constant">STDERR</span><span class="plain">, </span><span class="string">"Clashing escape is %s%c\</span><span class="plain">n</span><span class="string">"</span><span class="plain">, (</span><span class="identifier">set</span><span class="plain"> == 0)?</span><span class="string">"%"</span><span class="plain">:</span><span class="string">"$"</span><span class="plain">, </span><span class="identifier">esc</span><span class="plain">);</span>
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<span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"clash of escapes"</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="identifier">escapes_category</span><span class="plain">[</span><span class="identifier">set</span><span class="plain">][</span><span class="identifier">esc</span><span class="plain">] = </span><span class="identifier">cat</span><span class="plain">;</span>
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<span class="identifier">the_escapes</span><span class="plain">[</span><span class="identifier">set</span><span class="plain">][</span><span class="identifier">esc</span><span class="plain">] = </span><span class="identifier">f</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 Writers::register_writer_p is used in <a href="#SP4">§4</a>.</p>
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<p class="inwebparagraph"><a id="SP5_1"></a><b>§5.1. </b>We're going to implement <code class="display"><span class="extract">%d</span></code> and a few others directly, so those are marked
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in the table as being unavailable for registration.
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</p>
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<p class="inwebparagraph">Note that we don't support <code class="display"><span class="extract">%f</span></code> for floats; but we do add our very own <code class="display"><span class="extract">%w</span></code>
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for wide strings.
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</p>
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<p class="macrodefinition"><code class="display">
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<<span class="cwebmacrodefn">Initialise the table of escapes</span> <span class="cwebmacronumber">5.1</span>> =
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</code></p>
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<pre class="displaydefn">
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<span class="identifier">escapes_registered</span><span class="plain"> = </span><span class="constant">TRUE</span><span class="plain">;</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">e</span><span class="plain">=0; </span><span class="identifier">e</span><span class="plain"><2; </span><span class="identifier">e</span><span class="plain">++)</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">i</span><span class="plain">=0; </span><span class="identifier">i</span><span class="plain"><128; </span><span class="identifier">i</span><span class="plain">++) {</span>
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<span class="identifier">the_escapes</span><span class="plain">[</span><span class="identifier">e</span><span class="plain">][</span><span class="identifier">i</span><span class="plain">] = </span><span class="identifier">NULL</span><span class="plain">; </span><span class="identifier">escapes_category</span><span class="plain">[</span><span class="identifier">e</span><span class="plain">][</span><span class="identifier">i</span><span class="plain">] = </span><span class="constant">VACANT_ECAT</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="identifier">escapes_category</span><span class="plain">[0][</span><span class="character">'c'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
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<span class="identifier">escapes_category</span><span class="plain">[0][</span><span class="character">'d'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
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<span class="identifier">escapes_category</span><span class="plain">[0][</span><span class="character">'g'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
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<span class="identifier">escapes_category</span><span class="plain">[0][</span><span class="character">'i'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
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<span class="identifier">escapes_category</span><span class="plain">[0][</span><span class="character">'s'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
|
|
<span class="identifier">escapes_category</span><span class="plain">[0][</span><span class="character">'w'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
|
|
<span class="identifier">escapes_category</span><span class="plain">[0][</span><span class="character">'x'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
|
|
<span class="identifier">escapes_category</span><span class="plain">[0][</span><span class="character">'%'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
|
|
<span class="identifier">escapes_category</span><span class="plain">[0][</span><span class="character">'$'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
|
|
<span class="identifier">escapes_category</span><span class="plain">[1][</span><span class="character">'%'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
|
|
<span class="identifier">escapes_category</span><span class="plain">[1][</span><span class="character">'$'</span><span class="plain">] = </span><span class="constant">DIRECT_ECAT</span><span class="plain">;</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="#SP5">§5</a>.</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP6"></a><b>§6. Writing. </b>We can finally get on with that formatted-print function we've all been
|
|
waiting for:
|
|
</p>
|
|
|
|
|
|
<pre class="display">
|
|
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Writers::printf</span><span class="plain">(</span><span class="reserved">text_stream</span><span class="plain"> *</span><span class="identifier">stream</span><span class="plain">, </span><span class="reserved">char</span><span class="plain"> *</span><span class="identifier">fmt</span><span class="plain">, ...) {</span>
|
|
<span class="identifier">va_list</span><span class="plain"> </span><span class="identifier">ap</span><span class="plain">; </span> <span class="comment">the variable argument list signified by the dots</span>
|
|
<span class="reserved">char</span><span class="plain"> *</span><span class="identifier">p</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stream</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain">;</span>
|
|
<span class="identifier">va_start</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="identifier">fmt</span><span class="plain">); </span> <span class="comment">macro to begin variable argument processing</span>
|
|
<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">p</span><span class="plain"> = </span><span class="identifier">fmt</span><span class="plain">; *</span><span class="identifier">p</span><span class="plain">; </span><span class="identifier">p</span><span class="plain">++) {</span>
|
|
<span class="reserved">switch</span><span class="plain"> (*</span><span class="identifier">p</span><span class="plain">) {</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="character">'%'</span><span class="plain">: {</span>
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">set</span><span class="plain"> = 0; </span><<span class="cwebmacro">Deal with escape sequences</span> <span class="cwebmacronumber">6.1</span>><span class="plain">;</span>
|
|
<span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="character">'$'</span><span class="plain">: {</span>
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">set</span><span class="plain"> = 1;</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">stream</span><span class="plain">-</span><span class="element">>stream_flags</span><span class="plain">) & </span><span class="constant">USES_LOG_ESCAPES_STRF</span><span class="plain">)</span>
|
|
<<span class="cwebmacro">Deal with escape sequences</span> <span class="cwebmacronumber">6.1</span>>
|
|
<span class="reserved">else</span><span class="plain"> </span><span class="functiontext">Streams::putc</span><span class="plain">(</span><span class="character">'$'</span><span class="plain">, </span><span class="identifier">stream</span><span class="plain">);</span>
|
|
<span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="character">'"'</span><span class="plain">:</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stream</span><span class="plain">-</span><span class="element">>stream_flags</span><span class="plain"> & </span><span class="constant">USES_I6_ESCAPES_STRF</span><span class="plain">)</span>
|
|
<span class="functiontext">Streams::putc</span><span class="plain">(</span><span class="character">'~'</span><span class="plain">, </span><span class="identifier">stream</span><span class="plain">);</span>
|
|
<span class="reserved">else</span><span class="plain"> </span><span class="functiontext">Streams::putc</span><span class="plain">(*</span><span class="identifier">p</span><span class="plain">, </span><span class="identifier">stream</span><span class="plain">);</span>
|
|
<span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="character">'\</span><span class="plain">n</span><span class="character">'</span><span class="plain">:</span>
|
|
<span class="functiontext">Streams::putc</span><span class="plain">(*</span><span class="identifier">p</span><span class="plain">, </span><span class="identifier">stream</span><span class="plain">);</span>
|
|
<span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="reserved">default</span><span class="plain">: </span><span class="functiontext">Streams::putc</span><span class="plain">(*</span><span class="identifier">p</span><span class="plain">, </span><span class="identifier">stream</span><span class="plain">); </span><span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">}</span>
|
|
<span class="identifier">va_end</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">); </span> <span class="comment">macro to end variable argument processing</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">The function Writers::printf is used in 2/str (<a href="2-str.html#SP3">§3</a>).</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP6_1"></a><b>§6.1. </b><code class="display">
|
|
<<span class="cwebmacrodefn">Deal with escape sequences</span> <span class="cwebmacronumber">6.1</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="reserved">char</span><span class="plain"> </span><span class="identifier">format_string</span><span class="plain">[8];</span>
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">esc_number</span><span class="plain"> = </span><span class="character">' '</span><span class="plain">;</span>
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">i</span><span class="plain"> = 0;</span>
|
|
<span class="identifier">format_string</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">++] = *(</span><span class="identifier">p</span><span class="plain">++);</span>
|
|
<span class="reserved">while</span><span class="plain"> (*</span><span class="identifier">p</span><span class="plain">) {</span>
|
|
<span class="identifier">format_string</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">++] = *</span><span class="identifier">p</span><span class="plain">;</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">islower</span><span class="plain">(*</span><span class="identifier">p</span><span class="plain">)) || (</span><span class="identifier">isupper</span><span class="plain">(*</span><span class="identifier">p</span><span class="plain">)) || ((</span><span class="identifier">set</span><span class="plain"> == 1) && (</span><span class="identifier">isdigit</span><span class="plain">(*</span><span class="identifier">p</span><span class="plain">))) ||</span>
|
|
<span class="plain">(*</span><span class="identifier">p</span><span class="plain"> == </span><span class="character">'%'</span><span class="plain">)) </span><span class="identifier">esc_number</span><span class="plain"> = (</span><span class="reserved">int</span><span class="plain">) *</span><span class="identifier">p</span><span class="plain">;</span>
|
|
<span class="identifier">p</span><span class="plain">++;</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">esc_number</span><span class="plain"> != </span><span class="character">' '</span><span class="plain">) || (</span><span class="identifier">i</span><span class="plain">==6)) </span><span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="identifier">format_string</span><span class="plain">[</span><span class="identifier">i</span><span class="plain">] = 0; </span><span class="identifier">p</span><span class="plain">--;</span>
|
|
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">esc_number</span><span class="plain"><0) || (</span><span class="identifier">esc_number</span><span class="plain"> > 255)) </span><span class="identifier">esc_number</span><span class="plain"> = 0;</span>
|
|
<span class="reserved">switch</span><span class="plain"> (</span><span class="identifier">escapes_category</span><span class="plain">[</span><span class="identifier">set</span><span class="plain">][</span><span class="identifier">esc_number</span><span class="plain">]) {</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="constant">POINTER_ECAT</span><span class="plain">: {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">set</span><span class="plain"> == 0) {</span>
|
|
<span class="identifier">writer_function</span><span class="plain"> </span><span class="identifier">f</span><span class="plain"> = (</span><span class="identifier">writer_function</span><span class="plain">) </span><span class="identifier">the_escapes</span><span class="plain">[0][</span><span class="identifier">esc_number</span><span class="plain">];</span>
|
|
<span class="reserved">void</span><span class="plain"> *</span><span class="identifier">q</span><span class="plain"> = </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> *);</span>
|
|
<span class="plain">(*</span><span class="identifier">f</span><span class="plain">)(</span><span class="identifier">stream</span><span class="plain">, </span><span class="identifier">format_string</span><span class="plain">+1, </span><span class="identifier">q</span><span class="plain">);</span>
|
|
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
|
|
<span class="identifier">log_function</span><span class="plain"> </span><span class="identifier">f</span><span class="plain"> = (</span><span class="identifier">log_function</span><span class="plain">) </span><span class="identifier">the_escapes</span><span class="plain">[1][</span><span class="identifier">esc_number</span><span class="plain">];</span>
|
|
<span class="reserved">void</span><span class="plain"> *</span><span class="identifier">q</span><span class="plain"> = </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="reserved">void</span><span class="plain"> *);</span>
|
|
<span class="plain">(*</span><span class="identifier">f</span><span class="plain">)(</span><span class="identifier">stream</span><span class="plain">, </span><span class="identifier">q</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="constant">INTSIZED_ECAT</span><span class="plain">: {</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">set</span><span class="plain"> == 0) {</span>
|
|
<span class="identifier">writer_function_I</span><span class="plain"> </span><span class="identifier">f</span><span class="plain"> = (</span><span class="identifier">writer_function_I</span><span class="plain">) </span><span class="identifier">the_escapes</span><span class="plain">[0][</span><span class="identifier">esc_number</span><span class="plain">];</span>
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">N</span><span class="plain"> = </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="reserved">int</span><span class="plain">);</span>
|
|
<span class="plain">(*</span><span class="identifier">f</span><span class="plain">)(</span><span class="identifier">stream</span><span class="plain">, </span><span class="identifier">format_string</span><span class="plain">+1, </span><span class="identifier">N</span><span class="plain">);</span>
|
|
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
|
|
<span class="identifier">log_function_I</span><span class="plain"> </span><span class="identifier">f</span><span class="plain"> = (</span><span class="identifier">log_function_I</span><span class="plain">) </span><span class="identifier">the_escapes</span><span class="plain">[1][</span><span class="identifier">esc_number</span><span class="plain">];</span>
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">N</span><span class="plain"> = </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="reserved">int</span><span class="plain">);</span>
|
|
<span class="plain">(*</span><span class="identifier">f</span><span class="plain">)(</span><span class="identifier">stream</span><span class="plain">, </span><span class="identifier">N</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="constant">WORDING_ECAT</span><span class="plain">: {</span>
|
|
<span class="plain">#</span><span class="identifier">ifdef</span><span class="plain"> </span><span class="identifier">WORDING_LOGS_ALLOWED</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">set</span><span class="plain"> == 0) {</span>
|
|
<span class="identifier">writer_function_W</span><span class="plain"> </span><span class="identifier">f</span><span class="plain"> = (</span><span class="identifier">writer_function_W</span><span class="plain">) </span><span class="identifier">the_escapes</span><span class="plain">[0][</span><span class="identifier">esc_number</span><span class="plain">];</span>
|
|
<span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain"> = </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="identifier">wording</span><span class="plain">);</span>
|
|
<span class="plain">(*</span><span class="identifier">f</span><span class="plain">)(</span><span class="identifier">stream</span><span class="plain">, </span><span class="identifier">format_string</span><span class="plain">+1, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> {</span>
|
|
<span class="identifier">log_function_W</span><span class="plain"> </span><span class="identifier">f</span><span class="plain"> = (</span><span class="identifier">log_function_W</span><span class="plain">) </span><span class="identifier">the_escapes</span><span class="plain">[1][</span><span class="identifier">esc_number</span><span class="plain">];</span>
|
|
<span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain"> = </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="identifier">wording</span><span class="plain">);</span>
|
|
<span class="plain">(*</span><span class="identifier">f</span><span class="plain">)(</span><span class="identifier">stream</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
|
|
<span class="plain">}</span>
|
|
<span class="plain">#</span><span class="identifier">endif</span>
|
|
<span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="constant">DIRECT_ECAT</span><span class="plain">: </span><<span class="cwebmacro">Implement this using the original printf</span> <span class="cwebmacronumber">6.1.1</span>><span class="plain">; </span><span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="constant">VACANT_ECAT</span><span class="plain">:</span>
|
|
<span class="identifier">WRITE_TO</span><span class="plain">(</span><span class="constant">STDERR</span><span class="plain">, </span><span class="string">"*** Bad WRITE escape: <%s> ***\</span><span class="plain">n</span><span class="string">"</span><span class="plain">, </span><span class="identifier">format_string</span><span class="plain">);</span>
|
|
<span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"Unknown string escape"</span><span class="plain">);</span>
|
|
<span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
</pre>
|
|
|
|
<p class="inwebparagraph"></p>
|
|
|
|
<p class="endnote">This code is used in <a href="#SP6">§6</a> (twice).</p>
|
|
|
|
<p class="inwebparagraph"><a id="SP6_1_1"></a><b>§6.1.1. </b>Here the traditional C library helps us out with the difficult ones to get
|
|
right. We don't trouble to check that correct <code class="display"><span class="extract">printf</span></code> escapes have been used:
|
|
instead, we pass anything in the form of a percentage sign, followed by
|
|
up to four nonalphabetic modifying characters, followed by an alphabetic
|
|
category character for numerical printing, straight through to <code class="display"><span class="extract">sprintf</span></code>
|
|
or <code class="display"><span class="extract">fprintf</span></code>.
|
|
</p>
|
|
|
|
<p class="inwebparagraph">Thus an escape like <code class="display"><span class="extract">%04d</span></code> is handled by the standard C library, but not
|
|
<code class="display"><span class="extract">%s</span></code>, which we handle directly. That's for two reasons: first, we want to
|
|
be careful to prevent overruns of memory streams; second, we need to ensure
|
|
that the correct encoding is used when writing to disc. The numerical
|
|
escapes involve only characters whose representation is the same in all our
|
|
file encodings, but expanding <code class="display"><span class="extract">%s</span></code> does not.
|
|
</p>
|
|
|
|
|
|
<p class="macrodefinition"><code class="display">
|
|
<<span class="cwebmacrodefn">Implement this using the original printf</span> <span class="cwebmacronumber">6.1.1</span>> =
|
|
</code></p>
|
|
|
|
|
|
<pre class="displaydefn">
|
|
<span class="plain">#</span><span class="identifier">pragma</span><span class="plain"> </span><span class="identifier">clang</span><span class="plain"> </span><span class="identifier">diagnostic</span><span class="plain"> </span><span class="identifier">push</span>
|
|
<span class="plain">#</span><span class="identifier">pragma</span><span class="plain"> </span><span class="identifier">clang</span><span class="plain"> </span><span class="identifier">diagnostic</span><span class="plain"> </span><span class="identifier">ignored</span><span class="plain"> </span><span class="string">"-Wformat-nonliteral"</span>
|
|
<span class="reserved">switch</span><span class="plain"> (</span><span class="identifier">esc_number</span><span class="plain">) {</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="character">'c'</span><span class="plain">: </span><span class="reserved">case</span><span class="plain"> </span><span class="character">'d'</span><span class="plain">: </span><span class="reserved">case</span><span class="plain"> </span><span class="character">'i'</span><span class="plain">: </span><span class="reserved">case</span><span class="plain"> </span><span class="character">'x'</span><span class="plain">: { </span> <span class="comment"><code class="display"><span class="extract">char</span></code> is promoted to <code class="display"><span class="extract">int</span></code> in variable arguments</span>
|
|
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">ival</span><span class="plain"> = </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="reserved">int</span><span class="plain">);</span>
|
|
<span class="reserved">char</span><span class="plain"> </span><span class="identifier">temp</span><span class="plain">[256];</span>
|
|
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">snprintf</span><span class="plain">(</span><span class="identifier">temp</span><span class="plain">, 255, </span><span class="identifier">format_string</span><span class="plain">, </span><span class="identifier">ival</span><span class="plain">) >= 255) </span><span class="identifier">strcpy</span><span class="plain">(</span><span class="identifier">temp</span><span class="plain">, </span><span class="string">"?"</span><span class="plain">);</span>
|
|
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">j</span><span class="plain"> = 0; </span><span class="identifier">temp</span><span class="plain">[</span><span class="identifier">j</span><span class="plain">]; </span><span class="identifier">j</span><span class="plain">++) </span><span class="functiontext">Streams::putc</span><span class="plain">(</span><span class="identifier">temp</span><span class="plain">[</span><span class="identifier">j</span><span class="plain">], </span><span class="identifier">stream</span><span class="plain">);</span>
|
|
<span class="reserved">break</span><span class="plain">;</span>
|
|
<span class="plain">}</span>
|
|
<span class="reserved">case</span><span class="plain"> </span><span class="character">'g'</span><span class="plain">: {</span>
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<span class="reserved">double</span><span class="plain"> </span><span class="identifier">dval</span><span class="plain"> = </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="reserved">double</span><span class="plain">);</span>
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<span class="reserved">char</span><span class="plain"> </span><span class="identifier">temp</span><span class="plain">[256];</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">snprintf</span><span class="plain">(</span><span class="identifier">temp</span><span class="plain">, 255, </span><span class="identifier">format_string</span><span class="plain">, </span><span class="identifier">dval</span><span class="plain">) >= 255) </span><span class="identifier">strcpy</span><span class="plain">(</span><span class="identifier">temp</span><span class="plain">, </span><span class="string">"?"</span><span class="plain">);</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">j</span><span class="plain"> = 0; </span><span class="identifier">temp</span><span class="plain">[</span><span class="identifier">j</span><span class="plain">]; </span><span class="identifier">j</span><span class="plain">++) </span><span class="functiontext">Streams::putc</span><span class="plain">(</span><span class="identifier">temp</span><span class="plain">[</span><span class="identifier">j</span><span class="plain">], </span><span class="identifier">stream</span><span class="plain">);</span>
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<span class="reserved">break</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="reserved">case</span><span class="plain"> </span><span class="character">'s'</span><span class="plain">:</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">char</span><span class="plain"> *</span><span class="identifier">sval</span><span class="plain"> = </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="reserved">char</span><span class="plain"> *); *</span><span class="identifier">sval</span><span class="plain">; </span><span class="identifier">sval</span><span class="plain">++) </span><span class="functiontext">Streams::putc</span><span class="plain">(*</span><span class="identifier">sval</span><span class="plain">, </span><span class="identifier">stream</span><span class="plain">);</span>
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<span class="reserved">break</span><span class="plain">;</span>
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<span class="reserved">case</span><span class="plain"> </span><span class="character">'w'</span><span class="plain">: {</span>
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<span class="identifier">wchar_t</span><span class="plain"> *</span><span class="identifier">W</span><span class="plain"> = (</span><span class="identifier">wchar_t</span><span class="plain"> *) </span><span class="identifier">va_arg</span><span class="plain">(</span><span class="identifier">ap</span><span class="plain">, </span><span class="identifier">wchar_t</span><span class="plain"> *);</span>
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<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">j</span><span class="plain"> = 0; </span><span class="identifier">W</span><span class="plain">[</span><span class="identifier">j</span><span class="plain">]; </span><span class="identifier">j</span><span class="plain">++) </span><span class="functiontext">Streams::putc</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">[</span><span class="identifier">j</span><span class="plain">], </span><span class="identifier">stream</span><span class="plain">);</span>
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<span class="reserved">break</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="reserved">case</span><span class="plain"> </span><span class="character">'%'</span><span class="plain">: </span><span class="functiontext">Streams::putc</span><span class="plain">(</span><span class="character">'%'</span><span class="plain">, </span><span class="identifier">stream</span><span class="plain">); </span><span class="reserved">break</span><span class="plain">;</span>
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<span class="reserved">case</span><span class="plain"> </span><span class="character">'$'</span><span class="plain">: </span><span class="functiontext">Streams::putc</span><span class="plain">(</span><span class="character">'$'</span><span class="plain">, </span><span class="identifier">stream</span><span class="plain">); </span><span class="reserved">break</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="plain">#</span><span class="identifier">pragma</span><span class="plain"> </span><span class="identifier">clang</span><span class="plain"> </span><span class="identifier">diagnostic</span><span class="plain"> </span><span class="identifier">pop</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">This code is used in <a href="#SP6_1">§6.1</a>.</p>
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