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<a href='https://github.com/akkartik/mu/blob/main/linux/advent2017/1a.mu'>https://github.com/akkartik/mu/blob/main/linux/advent2017/1a.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Advent of code 2017, problem 1a</span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment"># <a href="https://adventofcode.com/2017/day/1">https://adventofcode.com/2017/day/1</a></span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment">#</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment"># Mu solution by Sumeet Agarwal and Kartik Agaram</span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment"># <a href="https://archive.org/details/2021-06-02-akkartik-sumeet">https://archive.org/details/2021-06-02-akkartik-sumeet</a></span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment">#</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment"># To build on Linux:</span>
<span id="L8" class="LineNr"> 8 </span><span class="muComment"># $ git clone <a href="https://github.com/akkartik/mu">https://github.com/akkartik/mu</a></span>
<span id="L9" class="LineNr"> 9 </span><span class="muComment"># $ cd mu/linux</span>
<span id="L10" class="LineNr">10 </span><span class="muComment"># $ ./translate advent2017/1a.mu # emits a.elf</span>
<span id="L11" class="LineNr">11 </span><span class="muComment"># To run on Linux:</span>
<span id="L12" class="LineNr">12 </span><span class="muComment"># Download <a href="https://adventofcode.com/2017/day/1/input">https://adventofcode.com/2017/day/1/input</a></span>
<span id="L13" class="LineNr">13 </span><span class="muComment"># $ ./a.elf < input</span>
<span id="L14" class="LineNr">14 </span><span class="muComment"># Type in the number returned at <a href="https://adventofcode.com/2017/day/1">https://adventofcode.com/2017/day/1</a></span>
<span id="L15" class="LineNr">15 </span>
<span id="L16" class="LineNr">16 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='1a.mu.html#L16'>main</a></span><span class="PreProc"> -> </span>_/<span class="muRegEbx">ebx</span>: int <span class="Delimiter">{</span>
<span id="L17" class="LineNr">17 </span> <span class="PreProc">var</span> input_stream: (stream byte <span class="Constant">0x8000</span>)
<span id="L18" class="LineNr">18 </span> <span class="PreProc">var</span> input_stream_addr/<span class="muRegEsi">esi</span>: (addr stream byte) <span class="Special"><-</span> address input_stream
<span id="L19" class="LineNr">19 </span>
<span id="L20" class="LineNr">20 </span> <span class="PreProc">var</span> sum/<span class="muRegEdi">edi</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L21" class="LineNr">21 </span> <a href='../305keyboard.subx.html#L158'>read-line-from-real-keyboard</a> input_stream_addr
<span id="L22" class="LineNr">22 </span>
<span id="L23" class="LineNr">23 </span> <span class="PreProc">var</span> temp/eax: int <span class="Special"><-</span> <a href='1a.mu.html#L60'>read_digit</a> input_stream_addr
<span id="L24" class="LineNr">24 </span> <span class="PreProc">var</span> first_digit/<span class="muRegEbx">ebx</span>: int <span class="Special"><-</span> copy temp
<span id="L25" class="LineNr">25 </span> <span class="PreProc">var</span> this_digit/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> copy temp
<span id="L26" class="LineNr">26 </span>
<span id="L27" class="LineNr">27 </span> <span class="Delimiter">{</span>
<span id="L28" class="LineNr">28 </span> <span class="PreProc">var</span> done?/eax: boolean <span class="Special"><-</span> <a href='../309stream.subx.html#L6'>stream-empty?</a> input_stream_addr
<span id="L29" class="LineNr">29 </span> compare done?, <span class="Constant">1</span>
<span id="L30" class="LineNr">30 </span> <span class="PreProc">break-if-=</span>
<span id="L31" class="LineNr">31 </span>
<span id="L32" class="LineNr">32 </span> <span class="PreProc">var</span> next_digit/eax: int <span class="Special"><-</span> <a href='1a.mu.html#L60'>read_digit</a> input_stream_addr
<span id="L33" class="LineNr">33 </span> <span class="muComment"># hacky newline check</span>
<span id="L34" class="LineNr">34 </span> compare next_digit, <span class="Constant">0</span>
<span id="L35" class="LineNr">35 </span> <span class="PreProc">break-if-<</span>
<span id="L36" class="LineNr">36 </span>
<span id="L37" class="LineNr">37 </span> <span class="Delimiter">{</span>
<span id="L38" class="LineNr">38 </span> compare this_digit, next_digit
<span id="L39" class="LineNr">39 </span> <span class="PreProc">break-if-!=</span>
<span id="L40" class="LineNr">40 </span> sum <span class="Special"><-</span> add this_digit
<span id="L41" class="LineNr">41 </span> <span class="Delimiter">}</span>
<span id="L42" class="LineNr">42 </span>
<span id="L43" class="LineNr">43 </span> this_digit <span class="Special"><-</span> copy next_digit
<span id="L44" class="LineNr">44 </span>
<span id="L45" class="LineNr">45 </span> <span class="PreProc">loop</span>
<span id="L46" class="LineNr">46 </span> <span class="Delimiter">}</span>
<span id="L47" class="LineNr">47 </span>
<span id="L48" class="LineNr">48 </span> <span class="muComment"># the last iteration will need to compare the last number to the first</span>
<span id="L49" class="LineNr">49 </span> <span class="Delimiter">{</span>
<span id="L50" class="LineNr">50 </span> compare this_digit, first_digit
<span id="L51" class="LineNr">51 </span> <span class="PreProc">break-if-!=</span>
<span id="L52" class="LineNr">52 </span> sum <span class="Special"><-</span> add this_digit
<span id="L53" class="LineNr">53 </span> <span class="Delimiter">}</span>
<span id="L54" class="LineNr">54 </span>
<span id="L55" class="LineNr">55 </span> <a href='../405screen.mu.html#L484'>print-int32-decimal</a> <span class="Constant">0</span>, sum
<span id="L56" class="LineNr">56 </span>
<span id="L57" class="LineNr">57 </span> <span class="PreProc">return</span> <span class="Constant">0</span>/ok
<span id="L58" class="LineNr">58 </span><span class="Delimiter">}</span>
<span id="L59" class="LineNr">59 </span>
<span id="L60" class="LineNr">60 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='1a.mu.html#L60'>read_digit</a></span> input_stream_addr: (addr stream byte)<span class="PreProc"> -> </span>_/eax: int <span class="Delimiter">{</span>
<span id="L61" class="LineNr">61 </span> <span class="PreProc">var</span> next_digit/eax: byte <span class="Special"><-</span> <a href='../112read-byte.subx.html#L273'>read-byte</a> input_stream_addr
<span id="L62" class="LineNr">62 </span> next_digit <span class="Special"><-</span> subtract <span class="Constant">0x30</span>
<span id="L63" class="LineNr">63 </span> <span class="PreProc">var</span> next_digit/eax: int <span class="Special"><-</span> copy next_digit
<span id="L64" class="LineNr">64 </span> <span class="PreProc">return</span> next_digit
<span id="L65" class="LineNr">65 </span><span class="Delimiter">}</span>
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