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357 lines
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<ul><li><a href="../inweb/index.html">inweb</a></li>
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<!--Weave of 'Writers and Loggers' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</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></div>
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<p class="purpose">Formatted text output to streams.</p>
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<ul class="toc"><li><a href="2-wal.html#SP1">§1. Registration</a></li><li><a href="2-wal.html#SP6">§6. Writing</a></li><li><a href="2-wal.html#SP7">§7. Abbreviation macros</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Registration. </b>The main function here is modelled on the "minimum <span class="extract"><span class="extract-syntax">printf</span></span>" 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 <span class="extract"><span class="extract-syntax">printf</span></span>, <span class="extract"><span class="extract-syntax">sprintf</span></span>
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and <span class="extract"><span class="extract-syntax">fprintf</span></span> 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="commentary">Traditionally, in the C library, everything in the formatting string is
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literal except for <span class="extract"><span class="extract-syntax">%</span></span> escapes: thus <span class="extract"><span class="extract-syntax">%d</span></span> means "integer goes here", and
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so on. We follow this but allow extra <span class="extract"><span class="extract-syntax">%</span></span> escapes unknown to K&R, and we
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also allow a further family of <span class="extract"><span class="extract-syntax">$</span></span> 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="commentary">Each escape, say <span class="extract"><span class="extract-syntax">%z</span></span>, 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 code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">VACANT_ECAT</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax"> </span><span class="comment-syntax"> unregistered</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">POINTER_ECAT</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span><span class="plain-syntax"> </span><span class="comment-syntax"> data to be printed is a pointer to a structure</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">INTSIZED_ECAT</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span><span class="plain-syntax"> </span><span class="comment-syntax"> data to be printed is or fits into an integer</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">WORDING_ECAT</span><span class="plain-syntax"> </span><span class="constant-syntax">3</span><span class="plain-syntax"> </span><span class="comment-syntax"> data to be printed is a </span><span class="extract"><span class="extract-syntax">wording</span></span><span class="comment-syntax"> structure from inform7</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax"> </span><span class="constant-syntax">4</span><span class="plain-syntax"> </span><span class="comment-syntax"> data must be printed directly by the code below</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>We'll start with <span class="extract"><span class="extract-syntax">%</span></span> escapes, which generalise the familiar <span class="extract"><span class="extract-syntax">printf</span></span>
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escapes such as <span class="extract"><span class="extract-syntax">%d</span></span>. 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 <span class="extract"><span class="extract-syntax">wording</span></span>. 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="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">escapes_registered</span><span class="plain-syntax"> = </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[2][128]; </span><span class="comment-syntax"> one of the </span><span class="extract"><span class="extract-syntax">*_ECAT</span></span><span class="comment-syntax"> values above</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">the_escapes</span><span class="plain-syntax">[2][128]; </span><span class="comment-syntax"> the function to call to implement this</span>
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">writer_function</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *);</span>
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">writer_function_I</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">int</span><span class="plain-syntax">);</span>
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">log_function</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *);</span>
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">log_function_I</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">int</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">WORDS_MODULE</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">writer_function_W</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *, </span><span class="identifier-syntax">wording</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">log_function_W</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="identifier-syntax">wording</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b></p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Writers::log_escape_usage</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">cat</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">cat</span><span class="plain-syntax"> < </span><span class="constant-syntax">2</span><span class="plain-syntax">; </span><span class="identifier-syntax">cat</span><span class="plain-syntax">++) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">alphanum</span><span class="plain-syntax"> = </span><span class="string-syntax">"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Vacant escapes: %s: "</span><span class="plain-syntax">, (</span><span class="identifier-syntax">cat</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)?</span><span class="string-syntax">"%"</span><span class="plain-syntax">:</span><span class="string-syntax">"$"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">alphanum</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++)</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[</span><span class="identifier-syntax">cat</span><span class="plain-syntax">][(</span><span class="reserved-syntax">int</span><span class="plain-syntax">) </span><span class="identifier-syntax">alphanum</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]] == </span><span class="constant-syntax">VACANT_ECAT</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"%c"</span><span class="plain-syntax">, </span><span class="identifier-syntax">alphanum</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">]);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>That gives us a number of front doors:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Writers::register_writer</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">Writers::register_writer</span></span>:<br/>Foundation Module - <a href="1-fm.html#SP8_1">§8.1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *)) {</span>
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<span class="plain-syntax"> </span><a href="2-wal.html#SP5" class="function-link"><span class="function-syntax">Writers::register_writer_p</span></a><span class="plain-syntax">(0, </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="constant-syntax">POINTER_ECAT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Writers::register_logger</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">Writers::register_logger</span></span>:<br/><a href="2-wal.html#SP7">§7</a><br/>Foundation Module - <a href="1-fm.html#SP8_3">§8.3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *)) {</span>
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<span class="plain-syntax"> </span><a href="2-wal.html#SP5" class="function-link"><span class="function-syntax">Writers::register_writer_p</span></a><span class="plain-syntax">(1, </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="constant-syntax">POINTER_ECAT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Writers::register_writer_I</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">int</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><a href="2-wal.html#SP5" class="function-link"><span class="function-syntax">Writers::register_writer_p</span></a><span class="plain-syntax">(0, </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="constant-syntax">INTSIZED_ECAT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Writers::register_logger_I</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">Writers::register_logger_I</span></span>:<br/><a href="2-wal.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *, </span><span class="reserved-syntax">int</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><a href="2-wal.html#SP5" class="function-link"><span class="function-syntax">Writers::register_writer_p</span></a><span class="plain-syntax">(1, </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="constant-syntax">INTSIZED_ECAT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="plain-syntax">#</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">WORDS_MODULE</span>
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<span class="plain-syntax">#</span><span class="identifier-syntax">define</span><span class="plain-syntax"> </span><span class="identifier-syntax">Writers::register_writer_W</span><span class="plain-syntax">(</span><span class="identifier-syntax">esc</span><span class="plain-syntax">, </span><span class="identifier-syntax">f</span><span class="plain-syntax">) </span><a href="2-wal.html#SP5" class="function-link"><span class="function-syntax">Writers::register_writer_p</span></a><span class="plain-syntax">(0, </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="constant-syntax">WORDING_ECAT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">#</span><span class="identifier-syntax">define</span><span class="plain-syntax"> </span><span class="identifier-syntax">Writers::register_logger_W</span><span class="plain-syntax">(</span><span class="identifier-syntax">esc</span><span class="plain-syntax">, </span><span class="identifier-syntax">f</span><span class="plain-syntax">) </span><a href="2-wal.html#SP5" class="function-link"><span class="function-syntax">Writers::register_writer_p</span></a><span class="plain-syntax">(1, </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, (</span><span class="reserved-syntax">void</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="constant-syntax">WORDING_ECAT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">#</span><span class="identifier-syntax">endif</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>All leading to:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Writers::register_writer_p</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">Writers::register_writer_p</span></span>:<br/><a href="2-wal.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">set</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">esc</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">f</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">cat</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">escapes_registered</span><span class="plain-syntax"> == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">) </span><span class="named-paragraph-container code-font"><a href="2-wal.html#SP5_1" class="named-paragraph-link"><span class="named-paragraph">Initialise the table of escapes</span><span class="named-paragraph-number">5.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">esc</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">esc</span><span class="plain-syntax"> >= </span><span class="constant-syntax">128</span><span class="plain-syntax">) ||</span>
|
|
<span class="plain-syntax"> ((</span><a href="4-chr.html#SP1" class="function-link"><span class="function-syntax">Characters::isalpha</span></a><span class="plain-syntax">((</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax">) </span><span class="identifier-syntax">esc</span><span class="plain-syntax">) == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><a href="4-chr.html#SP1" class="function-link"><span class="function-syntax">Characters::isdigit</span></a><span class="plain-syntax">((</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax">) </span><span class="identifier-syntax">esc</span><span class="plain-syntax">) == </span><span class="constant-syntax">FALSE</span><span class="plain-syntax">)))</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"nonalphabetic escape"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[</span><span class="identifier-syntax">set</span><span class="plain-syntax">][</span><span class="identifier-syntax">esc</span><span class="plain-syntax">] != </span><span class="constant-syntax">VACANT_ECAT</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="constant-syntax">STDERR</span><span class="plain-syntax">, </span><span class="string-syntax">"Clashing escape is %s%c\n"</span><span class="plain-syntax">, (</span><span class="identifier-syntax">set</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">)?</span><span class="string-syntax">"%"</span><span class="plain-syntax">:</span><span class="string-syntax">"$"</span><span class="plain-syntax">, </span><span class="identifier-syntax">esc</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"clash of escapes"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[</span><span class="identifier-syntax">set</span><span class="plain-syntax">][</span><span class="identifier-syntax">esc</span><span class="plain-syntax">] = </span><span class="identifier-syntax">cat</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">the_escapes</span><span class="plain-syntax">[</span><span class="identifier-syntax">set</span><span class="plain-syntax">][</span><span class="identifier-syntax">esc</span><span class="plain-syntax">] = </span><span class="identifier-syntax">f</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5_1" class="paragraph-anchor"></a><b>§5.1. </b>We're going to implement <span class="extract"><span class="extract-syntax">%d</span></span> and a few others directly, so those are marked
|
|
in the table as being unavailable for registration.
|
|
</p>
|
|
|
|
<p class="commentary">Note that we don't support <span class="extract"><span class="extract-syntax">%f</span></span> for floats; but we do add our very own <span class="extract"><span class="extract-syntax">%w</span></span>
|
|
for wide strings.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Initialise the table of escapes</span><span class="named-paragraph-number">5.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_registered</span><span class="plain-syntax"> = </span><span class="constant-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">e</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">e</span><span class="plain-syntax"><2; </span><span class="identifier-syntax">e</span><span class="plain-syntax">++)</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><128; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">the_escapes</span><span class="plain-syntax">[</span><span class="identifier-syntax">e</span><span class="plain-syntax">][</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[</span><span class="identifier-syntax">e</span><span class="plain-syntax">][</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><span class="constant-syntax">VACANT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[0][</span><span class="character-syntax">'c'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[0][</span><span class="character-syntax">'d'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[0][</span><span class="character-syntax">'g'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[0][</span><span class="character-syntax">'i'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[0][</span><span class="character-syntax">'s'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[0][</span><span class="character-syntax">'w'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[0][</span><span class="character-syntax">'x'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[0][</span><span class="character-syntax">'%'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[0][</span><span class="character-syntax">'$'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[1][</span><span class="character-syntax">'%'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[1][</span><span class="character-syntax">'$'</span><span class="plain-syntax">] = </span><span class="constant-syntax">DIRECT_ECAT</span><span class="plain-syntax">;</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-wal.html#SP5">§5</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. Writing. </b>We can finally get on with that formatted-print function we've all been
|
|
waiting for:
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Writers::printf</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">Writers::printf</span></span>:<br/>Streams - <a href="2-str.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">stream</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">fmt</span><span class="plain-syntax">, ...) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">va_list</span><span class="plain-syntax"> </span><span class="identifier-syntax">ap</span><span class="plain-syntax">; </span><span class="comment-syntax"> the variable argument list signified by the dots</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">p</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">stream</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">va_start</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">fmt</span><span class="plain-syntax">); </span><span class="comment-syntax"> macro to begin variable argument processing</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="identifier-syntax">p</span><span class="plain-syntax"> = </span><span class="identifier-syntax">fmt</span><span class="plain-syntax">; *</span><span class="identifier-syntax">p</span><span class="plain-syntax">; </span><span class="identifier-syntax">p</span><span class="plain-syntax">++) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">p</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'%'</span><span class="plain-syntax">: {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">set</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="named-paragraph-container code-font"><a href="2-wal.html#SP6_1" class="named-paragraph-link"><span class="named-paragraph">Deal with escape sequences</span><span class="named-paragraph-number">6.1</span></a></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'$'</span><span class="plain-syntax">: {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">set</span><span class="plain-syntax"> = </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">stream</span><span class="plain-syntax">-></span><span class="element-syntax">stream_flags</span><span class="plain-syntax">) & </span><span class="constant-syntax">USES_LOG_ESCAPES_STRF</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-wal.html#SP6_1" class="named-paragraph-link"><span class="named-paragraph">Deal with escape sequences</span><span class="named-paragraph-number">6.1</span></a></span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(</span><span class="character-syntax">'$'</span><span class="plain-syntax">, </span><span class="identifier-syntax">stream</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'"'</span><span class="plain-syntax">:</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">stream</span><span class="plain-syntax">-></span><span class="element-syntax">stream_flags</span><span class="plain-syntax"> & </span><span class="constant-syntax">USES_I6_ESCAPES_STRF</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(</span><span class="character-syntax">'~'</span><span class="plain-syntax">, </span><span class="identifier-syntax">stream</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(*</span><span class="identifier-syntax">p</span><span class="plain-syntax">, </span><span class="identifier-syntax">stream</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'\n'</span><span class="plain-syntax">:</span>
|
|
<span class="plain-syntax"> </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(*</span><span class="identifier-syntax">p</span><span class="plain-syntax">, </span><span class="identifier-syntax">stream</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span><span class="plain-syntax"> </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(*</span><span class="identifier-syntax">p</span><span class="plain-syntax">, </span><span class="identifier-syntax">stream</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">va_end</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">); </span><span class="comment-syntax"> macro to end variable argument processing</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6_1" class="paragraph-anchor"></a><b>§6.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Deal with escape sequences</span><span class="named-paragraph-number">6.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">[8];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">esc_number</span><span class="plain-syntax"> = </span><span class="character-syntax">' '</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">++] = *(</span><span class="identifier-syntax">p</span><span class="plain-syntax">++);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (*</span><span class="identifier-syntax">p</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">++] = *</span><span class="identifier-syntax">p</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">islower</span><span class="plain-syntax">(*</span><span class="identifier-syntax">p</span><span class="plain-syntax">)) || (</span><span class="identifier-syntax">isupper</span><span class="plain-syntax">(*</span><span class="identifier-syntax">p</span><span class="plain-syntax">)) || ((</span><span class="identifier-syntax">set</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">isdigit</span><span class="plain-syntax">(*</span><span class="identifier-syntax">p</span><span class="plain-syntax">))) ||</span>
|
|
<span class="plain-syntax"> (*</span><span class="identifier-syntax">p</span><span class="plain-syntax"> == </span><span class="character-syntax">'%'</span><span class="plain-syntax">)) </span><span class="identifier-syntax">esc_number</span><span class="plain-syntax"> = (</span><span class="reserved-syntax">int</span><span class="plain-syntax">) *</span><span class="identifier-syntax">p</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">p</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax"> != </span><span class="character-syntax">' '</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">i</span><span class="plain-syntax">==6)) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">[</span><span class="identifier-syntax">i</span><span class="plain-syntax">] = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">p</span><span class="plain-syntax">--;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax"><0) || (</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax"> > </span><span class="constant-syntax">255</span><span class="plain-syntax">)) </span><span class="identifier-syntax">esc_number</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">escapes_category</span><span class="plain-syntax">[</span><span class="identifier-syntax">set</span><span class="plain-syntax">][</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax">]) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">POINTER_ECAT:</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">set</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">writer_function</span><span class="plain-syntax"> </span><span class="identifier-syntax">f</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">writer_function</span><span class="plain-syntax">) </span><span class="identifier-syntax">the_escapes</span><span class="plain-syntax">[0][</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *);</span>
|
|
<span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="identifier-syntax">stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">+1, </span><span class="identifier-syntax">q</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">log_function</span><span class="plain-syntax"> </span><span class="identifier-syntax">f</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">log_function</span><span class="plain-syntax">) </span><span class="identifier-syntax">the_escapes</span><span class="plain-syntax">[1][</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">q</span><span class="plain-syntax"> = </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *);</span>
|
|
<span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="identifier-syntax">stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">q</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">INTSIZED_ECAT:</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">set</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">writer_function_I</span><span class="plain-syntax"> </span><span class="identifier-syntax">f</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">writer_function_I</span><span class="plain-syntax">) </span><span class="identifier-syntax">the_escapes</span><span class="plain-syntax">[0][</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="identifier-syntax">stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">+1, </span><span class="identifier-syntax">N</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">log_function_I</span><span class="plain-syntax"> </span><span class="identifier-syntax">f</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">log_function_I</span><span class="plain-syntax">) </span><span class="identifier-syntax">the_escapes</span><span class="plain-syntax">[1][</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">N</span><span class="plain-syntax"> = </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="identifier-syntax">stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">WORDING_ECAT:</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">WORDS_MODULE</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">set</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">writer_function_W</span><span class="plain-syntax"> </span><span class="identifier-syntax">f</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">writer_function_W</span><span class="plain-syntax">) </span><span class="identifier-syntax">the_escapes</span><span class="plain-syntax">[0][</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="identifier-syntax">stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">+1, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">log_function_W</span><span class="plain-syntax"> </span><span class="identifier-syntax">f</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">log_function_W</span><span class="plain-syntax">) </span><span class="identifier-syntax">the_escapes</span><span class="plain-syntax">[1][</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax">];</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">wording</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> (*</span><span class="identifier-syntax">f</span><span class="plain-syntax">)(</span><span class="identifier-syntax">stream</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">DIRECT_ECAT:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-wal.html#SP6_1_1" class="named-paragraph-link"><span class="named-paragraph">Implement this using the original printf</span><span class="named-paragraph-number">6.1.1</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">VACANT_ECAT:</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="constant-syntax">STDERR</span><span class="plain-syntax">, </span><span class="string-syntax">"*** Bad WRITE escape: <%s> ***\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"Unknown string escape"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-wal.html#SP6">§6</a> (twice).</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6_1_1" class="paragraph-anchor"></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 <span class="extract"><span class="extract-syntax">printf</span></span> 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 <span class="extract"><span class="extract-syntax">sprintf</span></span>
|
|
or <span class="extract"><span class="extract-syntax">fprintf</span></span>.
|
|
</p>
|
|
|
|
<p class="commentary">Thus an escape like <span class="extract"><span class="extract-syntax">%04d</span></span> is handled by the standard C library, but not
|
|
<span class="extract"><span class="extract-syntax">%s</span></span>, 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 <span class="extract"><span class="extract-syntax">%s</span></span> does not.
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Implement this using the original printf</span><span class="named-paragraph-number">6.1.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">pragma</span><span class="plain-syntax"> </span><span class="identifier-syntax">clang</span><span class="plain-syntax"> </span><span class="identifier-syntax">diagnostic</span><span class="plain-syntax"> </span><span class="identifier-syntax">push</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">pragma</span><span class="plain-syntax"> </span><span class="identifier-syntax">clang</span><span class="plain-syntax"> </span><span class="identifier-syntax">diagnostic</span><span class="plain-syntax"> </span><span class="identifier-syntax">ignored</span><span class="plain-syntax"> </span><span class="string-syntax">"-Wformat-nonliteral"</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">esc_number</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'c'</span><span class="plain-syntax">: </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'d'</span><span class="plain-syntax">: </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'i'</span><span class="plain-syntax">: </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'x'</span><span class="plain-syntax">: { </span><span class="comment-syntax"> </span><span class="extract"><span class="extract-syntax">char</span></span><span class="comment-syntax"> is promoted to </span><span class="extract"><span class="extract-syntax">int</span></span><span class="comment-syntax"> in variable arguments</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ival</span><span class="plain-syntax"> = </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> </span><span class="identifier-syntax">temp</span><span class="plain-syntax">[256];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="constant-syntax">PLATFORM_SNPRINTF</span><span class="plain-syntax">(</span><span class="identifier-syntax">temp</span><span class="plain-syntax">, </span><span class="constant-syntax">255</span><span class="plain-syntax">, </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">, </span><span class="identifier-syntax">ival</span><span class="plain-syntax">) >= </span><span class="constant-syntax">255</span><span class="plain-syntax">) </span><span class="identifier-syntax">strcpy</span><span class="plain-syntax">(</span><span class="identifier-syntax">temp</span><span class="plain-syntax">, </span><span class="string-syntax">"?"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">temp</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">]; </span><span class="identifier-syntax">j</span><span class="plain-syntax">++) </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">temp</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">], </span><span class="identifier-syntax">stream</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'g'</span><span class="plain-syntax">: {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">double</span><span class="plain-syntax"> </span><span class="identifier-syntax">dval</span><span class="plain-syntax"> = </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">double</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> </span><span class="identifier-syntax">temp</span><span class="plain-syntax">[256];</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="constant-syntax">PLATFORM_SNPRINTF</span><span class="plain-syntax">(</span><span class="identifier-syntax">temp</span><span class="plain-syntax">, </span><span class="constant-syntax">255</span><span class="plain-syntax">, </span><span class="identifier-syntax">format_string</span><span class="plain-syntax">, </span><span class="identifier-syntax">dval</span><span class="plain-syntax">) >= </span><span class="constant-syntax">255</span><span class="plain-syntax">) </span><span class="identifier-syntax">strcpy</span><span class="plain-syntax">(</span><span class="identifier-syntax">temp</span><span class="plain-syntax">, </span><span class="string-syntax">"?"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">temp</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">]; </span><span class="identifier-syntax">j</span><span class="plain-syntax">++) </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">temp</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">], </span><span class="identifier-syntax">stream</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'s'</span><span class="plain-syntax">:</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sval</span><span class="plain-syntax"> = </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *); *</span><span class="identifier-syntax">sval</span><span class="plain-syntax">; </span><span class="identifier-syntax">sval</span><span class="plain-syntax">++) </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(*</span><span class="identifier-syntax">sval</span><span class="plain-syntax">, </span><span class="identifier-syntax">stream</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'w'</span><span class="plain-syntax">: {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">W</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *) </span><span class="identifier-syntax">va_arg</span><span class="plain-syntax">(</span><span class="identifier-syntax">ap</span><span class="plain-syntax">, </span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">j</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">W</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">]; </span><span class="identifier-syntax">j</span><span class="plain-syntax">++) </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">[</span><span class="identifier-syntax">j</span><span class="plain-syntax">], </span><span class="identifier-syntax">stream</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'%'</span><span class="plain-syntax">: </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(</span><span class="character-syntax">'%'</span><span class="plain-syntax">, </span><span class="identifier-syntax">stream</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="character-syntax">'$'</span><span class="plain-syntax">: </span><a href="2-str.html#SP35" class="function-link"><span class="function-syntax">Streams::putc</span></a><span class="plain-syntax">(</span><span class="character-syntax">'$'</span><span class="plain-syntax">, </span><span class="identifier-syntax">stream</span><span class="plain-syntax">); </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> #</span><span class="identifier-syntax">pragma</span><span class="plain-syntax"> </span><span class="identifier-syntax">clang</span><span class="plain-syntax"> </span><span class="identifier-syntax">diagnostic</span><span class="plain-syntax"> </span><span class="identifier-syntax">pop</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-wal.html#SP6_1">§6.1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. Abbreviation macros. </b>The following proved convenient for Inform, at any rate.
|
|
</p>
|
|
|
|
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">REGISTER_WRITER</span><span class="plain-syntax">(</span><span class="identifier-syntax">c</span><span class="plain-syntax">, </span><span class="identifier-syntax">f</span><span class="plain-syntax">) </span><a href="2-wal.html#SP4" class="function-link"><span class="function-syntax">Writers::register_logger</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">c</span><span class="plain-syntax">, &</span><span class="identifier-syntax">f</span><span class="plain-syntax">##</span><span class="identifier-syntax">_writer</span><span class="plain-syntax">);</span>
|
|
<span class="definition-keyword">define</span> <span class="identifier-syntax">COMPILE_WRITER</span><span class="plain-syntax">(</span><span class="identifier-syntax">t</span><span class="plain-syntax">, </span><span class="identifier-syntax">f</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="identifier-syntax">f</span><span class="plain-syntax">##</span><span class="identifier-syntax">_writer</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">format</span><span class="plain-syntax">, </span><span class="reserved-syntax">void</span><span class="plain-syntax"> *</span><span class="identifier-syntax">obj</span><span class="plain-syntax">) { </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">SDL</span><span class="plain-syntax"> = </span><span class="identifier-syntax">DL</span><span class="plain-syntax">; </span><span class="identifier-syntax">DL</span><span class="plain-syntax"> = </span><span class="identifier-syntax">format</span><span class="plain-syntax">; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">DL</span><span class="plain-syntax">) </span><span class="identifier-syntax">f</span><span class="plain-syntax">((</span><span class="identifier-syntax">t</span><span class="plain-syntax">) </span><span class="identifier-syntax">obj</span><span class="plain-syntax">); </span><span class="identifier-syntax">DL</span><span class="plain-syntax"> = </span><span class="identifier-syntax">SDL</span><span class="plain-syntax">; }</span>
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<span class="definition-keyword">define</span> <span class="identifier-syntax">REGISTER_WRITER_I</span><span class="plain-syntax">(</span><span class="identifier-syntax">c</span><span class="plain-syntax">, </span><span class="identifier-syntax">f</span><span class="plain-syntax">) </span><a href="2-wal.html#SP4" class="function-link"><span class="function-syntax">Writers::register_logger_I</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">c</span><span class="plain-syntax">, &</span><span class="identifier-syntax">f</span><span class="plain-syntax">##</span><span class="identifier-syntax">_writer</span><span class="plain-syntax">);</span>
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<span class="definition-keyword">define</span> <span class="identifier-syntax">COMPILE_WRITER_I</span><span class="plain-syntax">(</span><span class="identifier-syntax">t</span><span class="plain-syntax">, </span><span class="identifier-syntax">f</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="identifier-syntax">f</span><span class="plain-syntax">##</span><span class="identifier-syntax">_writer</span><span class="plain-syntax">(</span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">format</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="plain-syntax">) { </span><span class="reserved-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">SDL</span><span class="plain-syntax"> = </span><span class="identifier-syntax">DL</span><span class="plain-syntax">; </span><span class="identifier-syntax">DL</span><span class="plain-syntax"> = </span><span class="identifier-syntax">format</span><span class="plain-syntax">; </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">DL</span><span class="plain-syntax">) </span><span class="identifier-syntax">f</span><span class="plain-syntax">((</span><span class="identifier-syntax">t</span><span class="plain-syntax">) </span><span class="identifier-syntax">I</span><span class="plain-syntax">); </span><span class="identifier-syntax">DL</span><span class="plain-syntax"> = </span><span class="identifier-syntax">SDL</span><span class="plain-syntax">; }</span>
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