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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../extensions.html">Kits</a></li><li><a href="index.html">Architecture16Kit</a></li><li><b>File Input Output Template</b></li></ul></div>
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<p class="purpose">Access to external files.</p>
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<ul class="toc"><li><a href="S-fio.html#SP1">§1. API</a></li><li><a href="S-fio.html#SP2">§2. Errors</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. API. </b>The 16-bit architecture does not allow for any external file I/O at all,
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so these functions essentially refuse to do anything. Note that <span class="extract"><span class="extract-syntax">FileIO_GetC</span></span>
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returns end-of-file at all times, thus treating all files as if empty.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax">[ </span><span class="identifier-syntax">FileIO_Exists</span><span class="plain-syntax"> </span><span class="identifier-syntax">extf</span><span class="plain-syntax">; </span><span class="reserved-syntax">rfalse</span><span class="plain-syntax">; ];</span>
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<span class="plain-syntax">[ </span><span class="identifier-syntax">FileIO_Ready</span><span class="plain-syntax"> </span><span class="identifier-syntax">extf</span><span class="plain-syntax">; </span><span class="reserved-syntax">rfalse</span><span class="plain-syntax">; ];</span>
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<span class="plain-syntax">[ </span><span class="identifier-syntax">FileIO_GetC</span><span class="plain-syntax"> </span><span class="identifier-syntax">extf</span><span class="plain-syntax">; </span><span class="reserved-syntax">return</span><span class="plain-syntax"> -1; ];</span>
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<span class="plain-syntax">[ </span><span class="identifier-syntax">FileIO_PutTable</span><span class="plain-syntax"> </span><span class="identifier-syntax">extf</span><span class="plain-syntax"> </span><span class="identifier-syntax">tab</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FileIO_Error</span><span class="plain-syntax">(</span><span class="identifier-syntax">extf</span><span class="plain-syntax">, </span><span class="string-syntax">"external files cannot be used in the Z-machine"</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">FileIO_MarkReady</span><span class="plain-syntax"> </span><span class="identifier-syntax">extf</span><span class="plain-syntax"> </span><span class="identifier-syntax">status</span><span class="plain-syntax">; </span><span class="identifier-syntax">FileIO_PutTable</span><span class="plain-syntax">(</span><span class="identifier-syntax">extf</span><span class="plain-syntax">); ];</span>
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<span class="plain-syntax">[ </span><span class="identifier-syntax">FileIO_GetTable</span><span class="plain-syntax"> </span><span class="identifier-syntax">extf</span><span class="plain-syntax"> </span><span class="identifier-syntax">tab</span><span class="plain-syntax">; </span><span class="identifier-syntax">FileIO_PutTable</span><span class="plain-syntax">(</span><span class="identifier-syntax">extf</span><span class="plain-syntax">); ];</span>
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<span class="plain-syntax">[ </span><span class="identifier-syntax">FileIO_PrintContents</span><span class="plain-syntax"> </span><span class="identifier-syntax">extf</span><span class="plain-syntax">; </span><span class="identifier-syntax">FileIO_PutTable</span><span class="plain-syntax">(</span><span class="identifier-syntax">extf</span><span class="plain-syntax">); ];</span>
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<span class="plain-syntax">[ </span><span class="identifier-syntax">FileIO_PutContents</span><span class="plain-syntax"> </span><span class="identifier-syntax">extf</span><span class="plain-syntax">; </span><span class="identifier-syntax">FileIO_PutTable</span><span class="plain-syntax">(</span><span class="identifier-syntax">extf</span><span class="plain-syntax">); ];</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. Errors. </b>This could be used for I/O errors of all kinds, but in fact we only need one:
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see above.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax">[ </span><span class="identifier-syntax">FileIO_Error</span><span class="plain-syntax"> </span><span class="identifier-syntax">extf</span><span class="plain-syntax"> </span><span class="identifier-syntax">err_text</span><span class="plain-syntax"> </span><span class="identifier-syntax">struc</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">extf</span><span class="plain-syntax"> < </span><span class="constant-syntax">1</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">extf</span><span class="plain-syntax"> > </span><span class="identifier-syntax">NO_EXTERNAL_FILES</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">print</span><span class="plain-syntax"> </span><span class="string-syntax">"^*** Error on unknown file: "</span><span class="plain-syntax">, (</span><span class="reserved-syntax">string</span><span class="plain-syntax">) </span><span class="identifier-syntax">err_text</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">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">struc</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TableOfExternalFiles</span><span class="plain-syntax">--></span><span class="identifier-syntax">extf</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">print</span><span class="plain-syntax"> </span><span class="string-syntax">"^*** Error on file '"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> (</span><span class="reserved-syntax">string</span><span class="plain-syntax">) </span><span class="identifier-syntax">struc</span><span class="plain-syntax">--></span><span class="identifier-syntax">AUXF_FILENAME</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">string</span><span class="plain-syntax">) </span><span class="identifier-syntax">err_text</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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">RunTimeProblem</span><span class="plain-syntax">(</span><span class="identifier-syntax">RTP_FILEIOERROR</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">];</span>
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</pre>
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