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<title>Mu - linux/apps/parse-int.mu</title>
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<a href='https://github.com/akkartik/mu/blob/main/linux/apps/parse-int.mu'>https://github.com/akkartik/mu/blob/main/linux/apps/parse-int.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="muComment"># parse a decimal int at the commandline</span>
<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="muComment"># To run:</span>
<span id="L4" class="LineNr"> 4 </span><span class="muComment"># $ ./translate apps/parse-int.mu</span>
<span id="L5" class="LineNr"> 5 </span><span class="muComment"># $ ./a.elf 123</span>
<span id="L6" class="LineNr"> 6 </span><span class="muComment"># $ echo $?</span>
<span id="L7" class="LineNr"> 7 </span><span class="muComment"># 123</span>
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='parse-int.mu.html#L9'>main</a></span> _args: (addr array addr array byte)<span class="PreProc"> -> </span>_/<span class="muRegEbx">ebx</span>: int <span class="Delimiter">{</span>
<span id="L10" class="LineNr">10 </span> <span class="muComment"># if no args, print a message and exit</span>
<span id="L11" class="LineNr">11 </span> <span class="PreProc">var</span> args/<span class="muRegEsi">esi</span>: (addr array addr array byte) <span class="Special"><-</span> copy _args
<span id="L12" class="LineNr">12 </span> <span class="PreProc">var</span> n/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> length args
<span id="L13" class="LineNr">13 </span> compare n, <span class="Constant">1</span>
<span id="L14" class="LineNr">14 </span> <span class="Delimiter">{</span>
<span id="L15" class="LineNr">15 </span> <span class="PreProc">break-if-></span>
<span id="L16" class="LineNr">16 </span> <a href='../405screen.mu.html#L169'>print-string</a> <span class="Constant">0</span>/screen, <span class="Constant">"usage: <a href='parse-int.mu.html#L25'>parse-int</a> <integer>\n"</span>
<span id="L17" class="LineNr">17 </span> <span class="PreProc">return</span> <span class="Constant">1</span>
<span id="L18" class="LineNr">18 </span> <span class="Delimiter">}</span>
<span id="L19" class="LineNr">19 </span> <span class="muComment"># otherwise parse the first arg as an integer</span>
<span id="L20" class="LineNr">20 </span> <span class="PreProc">var</span> in/<span class="muRegEcx">ecx</span>: (addr addr array byte) <span class="Special"><-</span> index args, <span class="Constant">1</span>
<span id="L21" class="LineNr">21 </span> <span class="PreProc">var</span> out/eax: int <span class="Special"><-</span> <a href='parse-int.mu.html#L25'>parse-int</a> *in
<span id="L22" class="LineNr">22 </span> <span class="PreProc">return</span> out
<span id="L23" class="LineNr">23 </span><span class="Delimiter">}</span>
<span id="L24" class="LineNr">24 </span>
<span id="L25" class="LineNr">25 </span><span class="PreProc">fn</span> <span class="muFunction"><a href='parse-int.mu.html#L25'>parse-int</a></span> _in: (addr array byte)<span class="PreProc"> -> </span>_/eax: int <span class="Delimiter">{</span>
<span id="L26" class="LineNr">26 </span> <span class="PreProc">var</span> in/<span class="muRegEsi">esi</span>: (addr array byte) <span class="Special"><-</span> copy _in
<span id="L27" class="LineNr">27 </span> <span class="PreProc">var</span> len/<span class="muRegEdx">edx</span>: int <span class="Special"><-</span> length in
<span id="L28" class="LineNr">28 </span> <span class="PreProc">var</span> i/<span class="muRegEcx">ecx</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L29" class="LineNr">29 </span> <span class="PreProc">var</span> result/<span class="muRegEdi">edi</span>: int <span class="Special"><-</span> copy <span class="Constant">0</span>
<span id="L30" class="LineNr">30 </span> <span class="Delimiter">{</span>
<span id="L31" class="LineNr">31 </span> compare i, len
<span id="L32" class="LineNr">32 </span> <span class="PreProc">break-if->=</span>
<span id="L33" class="LineNr">33 </span> <span class="muComment"># result *= 10</span>
<span id="L34" class="LineNr">34 </span> <span class="PreProc">var</span> ten/eax: int <span class="Special"><-</span> copy <span class="Constant">0xa</span>
<span id="L35" class="LineNr">35 </span> result <span class="Special"><-</span> multiply ten
<span id="L36" class="LineNr">36 </span> <span class="muComment"># c = in[i]</span>
<span id="L37" class="LineNr">37 </span> <span class="PreProc">var</span> tmp/<span class="muRegEbx">ebx</span>: (addr byte) <span class="Special"><-</span> index in, i
<span id="L38" class="LineNr">38 </span> <span class="PreProc">var</span> c/eax: byte <span class="Special"><-</span> copy-byte *tmp
<span id="L39" class="LineNr">39 </span> <span class="muComment">#</span>
<span id="L40" class="LineNr">40 </span> <span class="PreProc">var</span> g/eax: grapheme <span class="Special"><-</span> copy c
<span id="L41" class="LineNr">41 </span> <span class="PreProc">var</span> digit/eax: int <span class="Special"><-</span> <a href='../126write-int-decimal.subx.html#L405'>to-decimal-digit</a> g
<span id="L42" class="LineNr">42 </span> result <span class="Special"><-</span> add digit
<span id="L43" class="LineNr">43 </span> i <span class="Special"><-</span> increment
<span id="L44" class="LineNr">44 </span> <span class="PreProc">loop</span>
<span id="L45" class="LineNr">45 </span> <span class="Delimiter">}</span>
<span id="L46" class="LineNr">46 </span> <span class="PreProc">return</span> result
<span id="L47" class="LineNr">47 </span><span class="Delimiter">}</span>
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