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<pre id='vimCodeElement'>
<span class="Comment"># Wrappers around file-system primitives that take a 'filesystem' object and</span>
<span class="Comment"># are thus easier to test.</span>
<span class="muData">container</span> filesystem [
<span class="Delimiter">{</span>data: (address table (address array character) (address array character))<span class="Delimiter">}</span>
]
<span class="muRecipe">def</span> start-reading fs:address:filesystem, filename:address:array:character<span class="muRecipe"> -> </span>contents:address:source:character [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
x:number/file<span class="Special"> <- </span>$open-file-for-reading filename
contents:address:source:character, sink:address:sink:character<span class="Special"> <- </span>new-channel <span class="Constant">30</span>
$print <span class="Constant">[sink: ]</span>, sink, <span class="Constant">10/newline</span>
chan:address:channel:character<span class="Special"> <- </span>get *sink, <span class="Constant">chan:offset</span>
$print <span class="Constant">[chan in start-reading: ]</span>, chan, <span class="Constant">10/newline</span>
start-running transmit x, sink
]
<span class="muRecipe">def</span> transmit file:number, sink:address:sink:character<span class="muRecipe"> -> </span>file:number, sink:address:sink:character [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
c:character<span class="Special"> <- </span>$read-from-file file
<span class="muControl">break-unless</span> c
sink<span class="Special"> <- </span>write sink, c
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
$print <span class="Constant">[closing chan after reading file]</span>, <span class="Constant">10/newline</span>
sink<span class="Special"> <- </span>close sink
$print <span class="Constant">[returning from 'transmit']</span>, <span class="Constant">10/newline</span>
]
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