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<a href='https://github.com/akkartik/mu/blob/main/ex9.mu'>https://github.com/akkartik/mu/blob/main/ex9.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Demo of reading and writing to disk.</span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># Steps for trying it out:</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment"># 1. Translate this example into a disk image code.img.</span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment"># ./translate ex9.mu</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment"># 2. Build a second disk image data.img containing some text.</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment"># dd if=/dev/zero of=data.img count=20160</span>
<span id="L8" class="LineNr"> 8 </span><span class="muComment"># echo 'abc def ghi' |dd of=data.img conv=notrunc</span>
<span id="L9" class="LineNr"> 9 </span><span class="muComment"># 3. Familiarize yourself with how the data disk looks within xxd:</span>
<span id="L10" class="LineNr">10 </span><span class="muComment"># xxd data.img |head</span>
<span id="L11" class="LineNr">11 </span><span class="muComment"># 4. Run in an emulator, either Qemu or Bochs.</span>
<span id="L12" class="LineNr">12 </span><span class="muComment"># qemu-system-i386 -hda code.img -hdb data.img</span>
<span id="L13" class="LineNr">13 </span><span class="muComment"># bochs -f bochsrc.2disks</span>
<span id="L14" class="LineNr">14 </span><span class="muComment"># 5. Exit the emulator.</span>
<span id="L15" class="LineNr">15 </span><span class="muComment"># 6. Notice that the data disk now contains the word count of the original text.</span>
<span id="L16" class="LineNr">16 </span><span class="muComment"># xxd data.img |head</span>
<span id="L17" class="LineNr">17 </span>
<span id="L18" class="LineNr">18 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex9.mu.html#L18'>main</a></span> <a href='500fake-screen.mu.html#L14'>screen</a>: (addr <a href='500fake-screen.mu.html#L14'>screen</a>), keyboard: (addr keyboard), data-disk: (addr disk) <span class="Delimiter">{</span>
<span id="L19" class="LineNr">19 </span> <span class="PreProc">var</span> text-storage: (stream byte <span class="Constant">0x200</span>)
<span id="L20" class="LineNr">20 </span> <span class="PreProc">var</span> text/<span class="Constant">esi</span>: (addr stream byte) <span class="Special"><-</span> address text-storage
<span id="L21" class="LineNr">21 </span> <a href='boot.subx.html#L960'>load-sectors</a> data-disk, <span class="Constant">0</span>/lba, <span class="Constant">1</span>/num-sectors, text
<span id="L22" class="LineNr">22 </span>
<span id="L23" class="LineNr">23 </span> <span class="PreProc">var</span> <a href='ex9.mu.html#L31'>word-count</a>/<span class="Constant">eax</span>: int <span class="Special"><-</span> <a href='ex9.mu.html#L31'>word-count</a> text
<span id="L24" class="LineNr">24 </span>
<span id="L25" class="LineNr">25 </span> <span class="PreProc">var</span> result-storage: (stream byte <span class="Constant">0x10</span>)
<span id="L26" class="LineNr">26 </span> <span class="PreProc">var</span> result/<span class="Constant">edi</span>: (addr stream byte) <span class="Special"><-</span> address result-storage
<span id="L27" class="LineNr">27 </span> <a href='126write-int-decimal.subx.html#L8'>write-int32-decimal</a> result, <a href='ex9.mu.html#L31'>word-count</a>
<span id="L28" class="LineNr">28 </span> <a href='boot.subx.html#L1023'>store-sectors</a> data-disk, <span class="Constant">0</span>/lba, <span class="Constant">1</span>/num-sectors, result
<span id="L29" class="LineNr">29 </span><span class="Delimiter">}</span>
<span id="L30" class="LineNr">30 </span>
<span id="L31" class="LineNr">31 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='ex9.mu.html#L31'>word-count</a></span> in: (addr stream byte)<span class="PreProc"> -> </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
<span id="L32" class="LineNr">32 </span> <span class="PreProc">var</span> result/<span class="Constant">edi</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L33" class="LineNr">33 </span> <span class="Delimiter">{</span>
<span id="L34" class="LineNr">34 </span> <span class="PreProc">var</span> done?/<span class="Constant">eax</span>: boolean <span class="Special"><-</span> <a href='309stream.subx.html#L6'>stream-empty?</a> in
<span id="L35" class="LineNr">35 </span> compare done?, <span class="Constant">0</span>/false
<span id="L36" class="LineNr">36 </span> <span class="PreProc">break-if-!=</span>
<span id="L37" class="LineNr">37 </span> <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="Special"><-</span> <a href='403unicode.mu.html#L92'>read-grapheme</a> in
<span id="L38" class="LineNr">38 </span> <span class="Delimiter">{</span>
<span id="L39" class="LineNr">39 </span> compare g, <span class="Constant">0x20</span>/space
<span id="L40" class="LineNr">40 </span> <span class="PreProc">break-if-!=</span>
<span id="L41" class="LineNr">41 </span> result <span class="Special"><-</span> increment
<span id="L42" class="LineNr">42 </span> <span class="Delimiter">}</span>
<span id="L43" class="LineNr">43 </span> <span class="Delimiter">{</span>
<span id="L44" class="LineNr">44 </span> compare g, <span class="Constant">0xa</span>/newline
<span id="L45" class="LineNr">45 </span> <span class="PreProc">break-if-!=</span>
<span id="L46" class="LineNr">46 </span> result <span class="Special"><-</span> increment
<span id="L47" class="LineNr">47 </span> <span class="Delimiter">}</span>
<span id="L48" class="LineNr">48 </span> <span class="PreProc">loop</span>
<span id="L49" class="LineNr">49 </span> <span class="Delimiter">}</span>
<span id="L50" class="LineNr">50 </span> <span class="PreProc">return</span> result
<span id="L51" class="LineNr">51 </span><span class="Delimiter">}</span>
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