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authorKartik Agaram <vc@akkartik.com>2021-03-23 17:31:08 -0700
committerKartik Agaram <vc@akkartik.com>2021-03-23 17:31:08 -0700
commit3350c34a74844e21ea69077e01efff3bae64bdcd (patch)
treefa06ba58542297d1cff6b78958d4547a40a25d21 /html/linux/parse-int.mu.html
parent62a244211024a8367332541c571621883c05bcce (diff)
downloadmu-3350c34a74844e21ea69077e01efff3bae64bdcd.tar.gz
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - linux/parse-int.mu</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
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+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/linux/parse-int.mu'>https://github.com/akkartik/mu/blob/main/linux/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 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"> -&gt; </span>_/<span class="Constant">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="Constant">esi</span>: (addr array addr array byte) <span class="Special">&lt;-</span> copy _args
+<span id="L12" class="LineNr">12 </span>  <span class="PreProc">var</span> n/<span class="Constant">ecx</span>: int <span class="Special">&lt;-</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-&gt;</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">&quot;usage: <a href='parse-int.mu.html#L25'>parse-int</a> &lt;integer&gt;\n&quot;</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="Constant">ecx</span>: (addr addr array byte) <span class="Special">&lt;-</span> index args, <span class="Constant">1</span>
+<span id="L21" class="LineNr">21 </span>  <span class="PreProc">var</span> out/<span class="Constant">eax</span>: int <span class="Special">&lt;-</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"> -&gt; </span>_/<span class="Constant">eax</span>: int <span class="Delimiter">{</span>
+<span id="L26" class="LineNr">26 </span>  <span class="PreProc">var</span> in/<span class="Constant">esi</span>: (addr array byte) <span class="Special">&lt;-</span> copy _in
+<span id="L27" class="LineNr">27 </span>  <span class="PreProc">var</span> len/<span class="Constant">edx</span>: int <span class="Special">&lt;-</span> length in
+<span id="L28" class="LineNr">28 </span>  <span class="PreProc">var</span> i/<span class="Constant">ecx</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">0</span>
+<span id="L29" class="LineNr">29 </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="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-&gt;=</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/<span class="Constant">eax</span>: int <span class="Special">&lt;-</span> copy <span class="Constant">0xa</span>
+<span id="L35" class="LineNr">35 </span>    result <span class="Special">&lt;-</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="Constant">ebx</span>: (addr byte) <span class="Special">&lt;-</span> index in, i
+<span id="L38" class="LineNr">38 </span>    <span class="PreProc">var</span> c/<span class="Constant">eax</span>: byte <span class="Special">&lt;-</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/<span class="Constant">eax</span>: grapheme <span class="Special">&lt;-</span> copy c
+<span id="L41" class="LineNr">41 </span>    <span class="PreProc">var</span> digit/<span class="Constant">eax</span>: int <span class="Special">&lt;-</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">&lt;-</span> add digit
+<span id="L43" class="LineNr">43 </span>    i <span class="Special">&lt;-</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>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->