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## print out a (global variable) string to stdout

var size : int = 14
var x : (array character) = "hello, world!"

fn main [
  call write 1/stdout, x, size
  call exit, 0
]

fn write fd : int, x : (address array byte), size : int [
  EBX <- copy fd
  ECX <- copy x
  EDX <- copy size
  EAX <- copy 4/write
  syscall
]

fn exit x : int [
  code/EBX <- copy x
  code/EAX <- copy 1/exit
  syscall
]
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<a href='https://github.com/akkartik/mu/blob/main/linux/advent2020/5b.mu'>https://github.com/akkartik/mu/blob/main/linux/advent2020/5b.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># <a href="https://adventofcode.com/2020/day/5">https://adventofcode.com/2020/day/5</a></span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># To run (on Linux):</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment">#   $ git clone <a href="https://github.com/akkartik/mu">https://github.com/akkartik/mu</a></span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment">#   $ cd mu</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment">#   $ ./translate advent2020/5b.mu</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment">#   $ ./a.elf &lt; input</span>
<span id="L8" class="LineNr"> 8 </span><span class="muComment">#</span>
<span id="L9" class="LineNr"> 9 </span><span class="muComment"># You'll need to register to download the 'input' file for yourself.</span>
<span id="L10" class="LineNr">10 </span>
<span id="L11" class="LineNr">11 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='5b.mu.html#L11'>main</a></span><span class="PreProc"> -&gt; </span>_/<span class="Constant">ebx</span>: int <span class="Delimiter">{</span>
<span id="L12" class="LineNr">12 </span>  <span class="PreProc">var</span> pass-storage: (array int <span class="Constant">0x400</span>)  <span class="muComment"># 1k ints</span>
<span id="L13" class="LineNr">13 </span>  <span class="PreProc">var</span> pass/<span class="Constant">esi</span>: (addr array int) <span class="Special">&lt;-</span> address pass-storage
<span id="L14" class="LineNr">14 </span>  <span class="muComment"># phase 1: populate pass array</span>
<span id="L15" class="LineNr">15 </span>  <span class="PreProc">var</span> line-storage: (stream byte <span class="Constant">0x10</span>)  <span class="muComment"># 16 bytes is enough</span>
<span id="L16" class="LineNr">16 </span>  <span class="PreProc">var</span> line/<span class="Constant">edx</span>: (addr stream byte) <span class="Special">&lt;-</span> address line-storage
<span id="L17" class="LineNr">17 </span>  <span class="Delimiter">{</span>
<span id="L18" class="LineNr">18 </span>    <span class="muComment"># read line from stdin</span>
<span id="L19" class="LineNr">19 </span>    <a href='../106stream.subx.html#L17'>clear-stream</a> line
<span id="L20" class="LineNr">20 </span>    <a href='../305keyboard.subx.html#L158'>read-line-from-real-keyboard</a> line
<span id="L21" class="LineNr">21 </span>    <span class="muComment"># if line is empty (not even a newline), quit</span>
<span id="L22" class="LineNr">22 </span>    <span class="PreProc">var</span> done?/<span class="Constant">eax</span>: boolean <span class="Special">&lt;-</span> <a href='../309stream.subx.html#L6'>stream-empty?</a> line
<span id="L23" class="LineNr">23 </span>    compare done?, <span class="Constant">0</span>/false
<span id="L24" class="LineNr">24 </span>    <span class="PreProc">break-if-!=</span>
<span id="L25" class="LineNr">25 </span>    <span class="muComment"># process line</span>
<span id="L26" class="LineNr">26 </span>    <span class="PreProc">var</span> seat-id/<span class="Constant">eax</span>: int <span class="Special">&lt;-</span> <a href='5b.mu.html#L57'>convert-from-binary</a> line
<span id="L27" class="LineNr">27 </span>    <span class="PreProc">var</span> dest/<span class="Constant">eax</span>: (addr int) <span class="Special">&lt;-</span> index pass, seat-id
<span id="L28" class="LineNr">28 </span>    copy-to *dest, <span class="Constant">1</span>
<span id="L29" class="LineNr">29 </span>    <span class="PreProc">loop</span>
<span id="L30" class="LineNr">30 </span>  <span class="Delimiter">}</span>
<span id="L31" class="LineNr">31 </span>  <span class="muComment"># phase 2: skip empty seats</span>
<span id="L32" class="LineNr">32 </span>  <span class="PreProc">var</span> i/<span class="Constant">eax</span>: int <span class="Special">&lt;-</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>    compare i, <span class="Constant">0x400</span>
<span id="L35" class="LineNr">35 </span>    <span class="PreProc">break-if-&gt;=</span>
<span id="L36" class="LineNr">36 </span>    <span class="PreProc">var</span> src/<span class="Constant">ecx</span>: (addr int) <span class="Special">&lt;-</span> index pass, i
<span id="L37" class="LineNr">37 </span>    compare *src, <span class="Constant">0</span>
<span id="L38" class="LineNr">38 </span>    <span class="PreProc">break-if-!=</span>
<span id="L39" class="LineNr">39 </span>    i <span class="Special">&lt;-</span> increment
<span id="L40" class="LineNr">40 </span>    <span class="PreProc">loop</span>
<span id="L41" class="LineNr">41 </span>  <span class="Delimiter">}</span>
<span id="L42" class="LineNr">42 </span>  <span class="muComment"># phase 3: skip non-empty seats</span>
<span id="L43" class="LineNr">43 </span>  <span class="Delimiter">{</span>
<span id="L44" class="LineNr">44 </span>    compare i, <span class="Constant">0x400</span>
<span id="L45" class="LineNr">45 </span>    <span class="PreProc">break-if-&gt;=</span>
<span id="L46" class="LineNr">46 </span>    <span class="PreProc">var</span> src/<span class="Constant">ecx</span>: (addr int) <span class="Special">&lt;-</span> index pass, i
<span id="L47" class="LineNr">47 </span>    compare *src, <span class="Constant">0</span>
<span id="L48" class="LineNr">48 </span>    <span class="PreProc">break-if-=</span>
<span id="L49" class="LineNr">49 </span>    i <span class="Special">&lt;-</span> increment
<span id="L50" class="LineNr">50 </span>    <span class="PreProc">loop</span>
<span id="L51" class="LineNr">51 </span>  <span class="Delimiter">}</span>
<span id="L52" class="LineNr">52 </span>  <a href='../405screen.mu.html#L484'>print-int32-decimal</a> <span class="Constant">0</span>, i
<span id="L53" class="LineNr">53 </span>  <a href='../405screen.mu.html#L169'>print-string</a> <span class="Constant">0</span>, <span class="Constant">&quot;\n&quot;</span>
<span id="L54" class="LineNr">54 </span>  <span class="PreProc">return</span> <span class="Constant">0</span>
<span id="L55" class="LineNr">55 </span><span class="Delimiter">}</span>
<span id="L56" class="LineNr">56 </span>
<span id="L57" class="LineNr">57 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='5b.mu.html#L57'>convert-from-binary</a></span> in: (addr stream byte)<span class="PreProc"> -&gt; </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
<span id="L58" class="LineNr">58 </span>  <span class="PreProc">var</span> result/<span class="Constant">edi</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">0</span>
<span id="L59" class="LineNr">59 </span>  <span class="PreProc">var</span> i/<span class="Constant">ecx</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">9</span>  <span class="muComment"># loop counter and also exponent</span>
<span id="L60" class="LineNr">60 </span>  <span class="Delimiter">{</span>
<span id="L61" class="LineNr">61 </span>    compare i, <span class="Constant">0</span>
<span id="L62" class="LineNr">62 </span>    <span class="PreProc">break-if-&lt;</span>
<span id="L63" class="LineNr">63 </span>    <span class="PreProc">var</span> c/<span class="Constant">eax</span>: byte <span class="Special">&lt;-</span> <a href='../112read-byte.subx.html#L273'>read-byte</a> in
<span id="L64" class="LineNr">64 </span>    <span class="PreProc">var</span> bit/<span class="Constant">edx</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">0</span>
<span id="L65" class="LineNr">65 </span>    <span class="Delimiter">{</span>
<span id="L66" class="LineNr">66 </span>      compare c, <span class="Constant">0x42</span>/B
<span id="L67" class="LineNr">67 </span>      <span class="PreProc">break-if-!=</span>
<span id="L68" class="LineNr">68 </span>      bit <span class="Special">&lt;-</span> copy <span class="Constant">1</span>
<span id="L69" class="LineNr">69 </span>    <span class="Delimiter">}</span>
<span id="L70" class="LineNr">70 </span>    <span class="Delimiter">{</span>
<span id="L71" class="LineNr">71 </span>      compare c, <span class="Constant">0x52</span>/R
<span id="L72" class="LineNr">72 </span>      <span class="PreProc">break-if-!=</span>
<span id="L73" class="LineNr">73 </span>      bit <span class="Special">&lt;-</span> copy <span class="Constant">1</span>
<span id="L74" class="LineNr">74 </span>    <span class="Delimiter">}</span>
<span id="L75" class="LineNr">75 </span>    <span class="PreProc">var</span> bit-value/<span class="Constant">eax</span>: int <span class="Special">&lt;-</span> <a href='../406int32.mu.html#L5'>repeated-shift-left</a> bit, i
<span id="L76" class="LineNr">76 </span>    result <span class="Special">&lt;-</span> add bit-value
<span id="L77" class="LineNr">77 </span>    i <span class="Special">&lt;-</span> decrement
<span id="L78" class="LineNr">78 </span>    <span class="PreProc">loop</span>
<span id="L79" class="LineNr">79 </span>  <span class="Delimiter">}</span>
<span id="L80" class="LineNr">80 </span>  <span class="PreProc">return</span> result
<span id="L81" class="LineNr">81 </span><span class="Delimiter">}</span>
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