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<a href='https://github.com/akkartik/mu/blob/master/304screen.subx'>https://github.com/akkartik/mu/blob/master/304screen.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="subxComment"># Primitives for screen control.</span>
<span id="L2" class="LineNr">  2 </span><span class="subxComment"># Require Linux and a modern terminal.</span>
<span id="L3" class="LineNr">  3 </span>
<span id="L4" class="LineNr">  4 </span>== code
<span id="L5" class="LineNr">  5 </span>
<span id="L6" class="LineNr">  6 </span><span class="subxFunction">enable-screen-grid-mode</span>:
<span id="L7" class="LineNr">  7 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L8" class="LineNr">  8 </span>    55/push-ebp
<span id="L9" class="LineNr">  9 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L10" class="LineNr"> 10 </span>    <span class="subxComment">#</span>
<span id="L11" class="LineNr"> 11 </span>    (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L12" class="LineNr"> 12 </span>    (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span>)
<span id="L13" class="LineNr"> 13 </span>    <span class="subxComment"># switch to second screen buffer</span>
<span id="L14" class="LineNr"> 14 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L15" class="LineNr"> 15 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[?1049h&quot;</span>)
<span id="L16" class="LineNr"> 16 </span>    <span class="subxComment">#</span>
<span id="L17" class="LineNr"> 17 </span>    (<a href='304screen.subx.html#L75'>clear-real-screen</a>)
<span id="L18" class="LineNr"> 18 </span><span class="Constant">$enable-screen-grid-mode:end</span>:
<span id="L19" class="LineNr"> 19 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L20" class="LineNr"> 20 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L21" class="LineNr"> 21 </span>    5d/pop-to-ebp
<span id="L22" class="LineNr"> 22 </span>    c3/return
<span id="L23" class="LineNr"> 23 </span>
<span id="L24" class="LineNr"> 24 </span><span class="subxFunction">enable-screen-type-mode</span>:
<span id="L25" class="LineNr"> 25 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L26" class="LineNr"> 26 </span>    55/push-ebp
<span id="L27" class="LineNr"> 27 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L28" class="LineNr"> 28 </span>    <span class="subxComment"># switch to first screen buffer</span>
<span id="L29" class="LineNr"> 29 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L30" class="LineNr"> 30 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[?1049l&quot;</span>)
<span id="L31" class="LineNr"> 31 </span><span class="Constant">$enable-screen-type-mode:end</span>:
<span id="L32" class="LineNr"> 32 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L33" class="LineNr"> 33 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L34" class="LineNr"> 34 </span>    5d/pop-to-ebp
<span id="L35" class="LineNr"> 35 </span>    c3/return
<span id="L36" class="LineNr"> 36 </span>
<span id="L37" class="LineNr"> 37 </span><span class="subxFunction">real-screen-size</span>:  <span class="subxComment"># -&gt; nrows/eax: int, ncols/ecx: int</span>
<span id="L38" class="LineNr"> 38 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L39" class="LineNr"> 39 </span>    55/push-ebp
<span id="L40" class="LineNr"> 40 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L41" class="LineNr"> 41 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L42" class="LineNr"> 42 </span>    52/push-edx
<span id="L43" class="LineNr"> 43 </span>    53/push-ebx
<span id="L44" class="LineNr"> 44 </span>    56/push-esi
<span id="L45" class="LineNr"> 45 </span>    57/push-edi
<span id="L46" class="LineNr"> 46 </span>    <span class="subxComment">#</span>
<span id="L47" class="LineNr"> 47 </span>    (<a href='304screen.subx.html#L424'>_maybe-open-terminal</a>)
<span id="L48" class="LineNr"> 48 </span>    <span class="subxComment"># var window-size-info/esi: (addr winsize)</span>
<span id="L49" class="LineNr"> 49 </span>    <span class="subxComment"># winsize is a type from the Linux kernel. We don't care how large it is.</span>
<span id="L50" class="LineNr"> 50 </span>    81 5/subop/subtract %esp 0x40/imm32
<span id="L51" class="LineNr"> 51 </span>    89/&lt;- %esi 4/r32/esp
<span id="L52" class="LineNr"> 52 </span>    <span class="subxComment"># ioctl(*Terminal-file-descriptor, TIOCGWINSZ, window-size-info)</span>
<span id="L53" class="LineNr"> 53 </span>    89/&lt;- %edx 6/r32/esi
<span id="L54" class="LineNr"> 54 </span>    b9/copy-to-ecx 0x5413/imm32/TIOCGWINSZ
<span id="L55" class="LineNr"> 55 </span>    8b/-&gt; *<span class="SpecialChar"><a href='304screen.subx.html#L446'>Terminal-file-descriptor</a></span> 3/r32/ebx
<span id="L56" class="LineNr"> 56 </span>    e8/call syscall_ioctl/disp32
<span id="L57" class="LineNr"> 57 </span>    <span class="subxComment"># some bitworking to extract 2 16-bit shorts</span>
<span id="L58" class="LineNr"> 58 </span>    8b/-&gt; *esi 0/r32/eax
<span id="L59" class="LineNr"> 59 </span>    81 4/subop/and %eax 0xffff/imm32
<span id="L60" class="LineNr"> 60 </span>    8b/-&gt; *esi 1/r32/ecx
<span id="L61" class="LineNr"> 61 </span>    c1/shift 5/subop/logical-right %ecx 0x10/imm8
<span id="L62" class="LineNr"> 62 </span><span class="Constant">$real-screen-size:end</span>:
<span id="L63" class="LineNr"> 63 </span>    <span class="subxS1Comment"># . reclaim locals</span>
<span id="L64" class="LineNr"> 64 </span>    81 0/subop/add %esp 0x40/imm32
<span id="L65" class="LineNr"> 65 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L66" class="LineNr"> 66 </span>    5f/pop-to-edi
<span id="L67" class="LineNr"> 67 </span>    5e/pop-to-esi
<span id="L68" class="LineNr"> 68 </span>    5b/pop-to-ebx
<span id="L69" class="LineNr"> 69 </span>    5a/pop-to-edx
<span id="L70" class="LineNr"> 70 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L71" class="LineNr"> 71 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L72" class="LineNr"> 72 </span>    5d/pop-to-ebp
<span id="L73" class="LineNr"> 73 </span>    c3/return
<span id="L74" class="LineNr"> 74 </span>
<span id="L75" class="LineNr"> 75 </span><span class="subxFunction">clear-real-screen</span>:
<span id="L76" class="LineNr"> 76 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L77" class="LineNr"> 77 </span>    55/push-ebp
<span id="L78" class="LineNr"> 78 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L79" class="LineNr"> 79 </span>    <span class="subxComment">#</span>
<span id="L80" class="LineNr"> 80 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L81" class="LineNr"> 81 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[H&quot;</span>)
<span id="L82" class="LineNr"> 82 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L83" class="LineNr"> 83 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[2J&quot;</span>)
<span id="L84" class="LineNr"> 84 </span><span class="Constant">$clear-real-screen:end</span>:
<span id="L85" class="LineNr"> 85 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L86" class="LineNr"> 86 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L87" class="LineNr"> 87 </span>    5d/pop-to-ebp
<span id="L88" class="LineNr"> 88 </span>    c3/return
<span id="L89" class="LineNr"> 89 </span>
<span id="L90" class="LineNr"> 90 </span><span class="subxComment"># row and col count from the top-left as (1, 1)</span>
<span id="L91" class="LineNr"> 91 </span><span class="subxFunction">move-cursor-on-real-screen</span>:  <span class="subxComment"># row: int, column: int</span>
<span id="L92" class="LineNr"> 92 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L93" class="LineNr"> 93 </span>    55/push-ebp
<span id="L94" class="LineNr"> 94 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L95" class="LineNr"> 95 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L96" class="LineNr"> 96 </span>    51/push-ecx
<span id="L97" class="LineNr"> 97 </span>    <span class="subxComment"># var buf/ecx: (stream byte 32)</span>
<span id="L98" class="LineNr"> 98 </span>    81 5/subop/subtract %esp 0x20/imm32
<span id="L99" class="LineNr"> 99 </span>    68/push 0x20/imm32/size
<span id="L100" class="LineNr">100 </span>    68/push 0/imm32/read
<span id="L101" class="LineNr">101 </span>    68/push 0/imm32/write
<span id="L102" class="LineNr">102 </span>    89/&lt;- %ecx 4/r32/esp
<span id="L103" class="LineNr">103 </span>    <span class="subxComment"># construct directive in buf</span>
<span id="L104" class="LineNr">104 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L105" class="LineNr">105 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">&quot;[&quot;</span>)
<span id="L106" class="LineNr">106 </span>    (<a href='126write-int-decimal.subx.html#L8'>write-int32-decimal</a> %ecx *(ebp+8))
<span id="L107" class="LineNr">107 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">&quot;;&quot;</span>)
<span id="L108" class="LineNr">108 </span>    (<a href='126write-int-decimal.subx.html#L8'>write-int32-decimal</a> %ecx *(ebp+0xc))
<span id="L109" class="LineNr">109 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">&quot;H&quot;</span>)
<span id="L110" class="LineNr">110 </span>    <span class="subxComment"># flush</span>
<span id="L111" class="LineNr">111 </span>    (<a href='113write-stream.subx.html#L17'>write-stream</a> 2 %ecx)
<span id="L112" class="LineNr">112 </span><span class="Constant">$move-cursor-on-real-screen:end</span>:
<span id="L113" class="LineNr">113 </span>    <span class="subxS1Comment"># . reclaim locals</span>
<span id="L114" class="LineNr">114 </span>    81 0/subop/add %esp 0x2c/imm32
<span id="L115" class="LineNr">115 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L116" class="LineNr">116 </span>    59/pop-to-ecx
<span id="L117" class="LineNr">117 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L118" class="LineNr">118 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L119" class="LineNr">119 </span>    5d/pop-to-ebp
<span id="L120" class="LineNr">120 </span>    c3/return
<span id="L121" class="LineNr">121 </span>
<span id="L122" class="LineNr">122 </span><span class="subxFunction">print-string-to-real-screen</span>:  <span class="subxComment"># s: (addr array byte)</span>
<span id="L123" class="LineNr">123 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L124" class="LineNr">124 </span>    55/push-ebp
<span id="L125" class="LineNr">125 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L126" class="LineNr">126 </span>    <span class="subxComment">#</span>
<span id="L127" class="LineNr">127 </span>    (<a href='108write.subx.html#L24'>write</a> 1 *(ebp+8))
<span id="L128" class="LineNr">128 </span><span class="Constant">$print-string-to-real-screen:end</span>:
<span id="L129" class="LineNr">129 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L130" class="LineNr">130 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L131" class="LineNr">131 </span>    5d/pop-to-ebp
<span id="L132" class="LineNr">132 </span>    c3/return
<span id="L133" class="LineNr">133 </span>
<span id="L134" class="LineNr">134 </span><span class="subxFunction">print-slice-to-real-screen</span>:  <span class="subxComment"># s: (addr slice)</span>
<span id="L135" class="LineNr">135 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L136" class="LineNr">136 </span>    55/push-ebp
<span id="L137" class="LineNr">137 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L138" class="LineNr">138 </span>    <span class="subxComment">#</span>
<span id="L139" class="LineNr">139 </span>    (<a href='123slice.subx.html#L908'>write-slice-buffered</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span> *(ebp+8))
<span id="L140" class="LineNr">140 </span>    (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L141" class="LineNr">141 </span><span class="Constant">$print-slice-to-real-screen:end</span>:
<span id="L142" class="LineNr">142 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L143" class="LineNr">143 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L144" class="LineNr">144 </span>    5d/pop-to-ebp
<span id="L145" class="LineNr">145 </span>    c3/return
<span id="L146" class="LineNr">146 </span>
<span id="L147" class="LineNr">147 </span><span class="subxFunction">print-stream-to-real-screen</span>:  <span class="subxComment"># s: (addr stream byte)</span>
<span id="L148" class="LineNr">148 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L149" class="LineNr">149 </span>    55/push-ebp
<span id="L150" class="LineNr">150 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L151" class="LineNr">151 </span>    <span class="subxComment">#</span>
<span id="L152" class="LineNr">152 </span>    (<a href='125write-stream-data.subx.html#L11'>write-stream-data</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span> *(ebp+8))
<span id="L153" class="LineNr">153 </span>    (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L154" class="LineNr">154 </span><span class="Constant">$print-stream-to-real-screen:end</span>:
<span id="L155" class="LineNr">155 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L156" class="LineNr">156 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L157" class="LineNr">157 </span>    5d/pop-to-ebp
<span id="L158" class="LineNr">158 </span>    c3/return
<span id="L159" class="LineNr">159 </span>
<span id="L160" class="LineNr">160 </span><span class="subxComment"># print a grapheme in utf-8 (only up to 4 bytes so far)</span>
<span id="L161" class="LineNr">161 </span><span class="subxFunction">print-grapheme-to-real-screen</span>:  <span class="subxComment"># c: grapheme</span>
<span id="L162" class="LineNr">162 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L163" class="LineNr">163 </span>    55/push-ebp
<span id="L164" class="LineNr">164 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L165" class="LineNr">165 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L166" class="LineNr">166 </span>    50/push-eax
<span id="L167" class="LineNr">167 </span>    <span class="subxComment"># var curr/eax: byte = 0</span>
<span id="L168" class="LineNr">168 </span>    b8/copy-to-eax 0/imm32
<span id="L169" class="LineNr">169 </span>    <span class="subxComment"># curr = *(ebp+8)</span>
<span id="L170" class="LineNr">170 </span>    8a/byte-&gt; *(ebp+8) 0/r32/al
<span id="L171" class="LineNr">171 </span>    <span class="subxComment"># if (curr == 0) return</span>
<span id="L172" class="LineNr">172 </span>    3d/compare-eax-and 0/imm32
<span id="L173" class="LineNr">173 </span>    74/jump-if-= $print-grapheme-to-real-screen:end/disp8
<span id="L174" class="LineNr">174 </span>    <span class="subxComment">#</span>
<span id="L175" class="LineNr">175 </span>    (<a href='304screen.subx.html#L205'>print-byte-to-real-screen</a> %eax)
<span id="L176" class="LineNr">176 </span>    <span class="subxComment"># curr = *(ebp+9)</span>
<span id="L177" class="LineNr">177 </span>    8a/byte-&gt; *(ebp+9) 0/r32/al
<span id="L178" class="LineNr">178 </span>    <span class="subxComment"># if (curr == 0) return</span>
<span id="L179" class="LineNr">179 </span>    3d/compare-eax-and 0/imm32
<span id="L180" class="LineNr">180 </span>    74/jump-if-= $print-grapheme-to-real-screen:end/disp8
<span id="L181" class="LineNr">181 </span>    <span class="subxComment">#</span>
<span id="L182" class="LineNr">182 </span>    (<a href='304screen.subx.html#L205'>print-byte-to-real-screen</a> %eax)
<span id="L183" class="LineNr">183 </span>    <span class="subxComment"># curr = *(ebp+10)</span>
<span id="L184" class="LineNr">184 </span>    8a/byte-&gt; *(ebp+0xa) 0/r32/al
<span id="L185" class="LineNr">185 </span>    <span class="subxComment"># if (curr == 0) return</span>
<span id="L186" class="LineNr">186 </span>    3d/compare-eax-and 0/imm32
<span id="L187" class="LineNr">187 </span>    74/jump-if-= $print-grapheme-to-real-screen:end/disp8
<span id="L188" class="LineNr">188 </span>    <span class="subxComment">#</span>
<span id="L189" class="LineNr">189 </span>    (<a href='304screen.subx.html#L205'>print-byte-to-real-screen</a> %eax)
<span id="L190" class="LineNr">190 </span>    <span class="subxComment"># curr = *(ebp+11)</span>
<span id="L191" class="LineNr">191 </span>    8a/byte-&gt; *(ebp+0xb) 0/r32/al
<span id="L192" class="LineNr">192 </span>    <span class="subxComment"># if (curr == 0) return</span>
<span id="L193" class="LineNr">193 </span>    3d/compare-eax-and 0/imm32
<span id="L194" class="LineNr">194 </span>    74/jump-if-= $print-grapheme-to-real-screen:end/disp8
<span id="L195" class="LineNr">195 </span>    <span class="subxComment">#</span>
<span id="L196" class="LineNr">196 </span>    (<a href='304screen.subx.html#L205'>print-byte-to-real-screen</a> %eax)
<span id="L197" class="LineNr">197 </span><span class="Constant">$print-grapheme-to-real-screen:end</span>:
<span id="L198" class="LineNr">198 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L199" class="LineNr">199 </span>    58/pop-to-eax
<span id="L200" class="LineNr">200 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L201" class="LineNr">201 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L202" class="LineNr">202 </span>    5d/pop-to-ebp
<span id="L203" class="LineNr">203 </span>    c3/return
<span id="L204" class="LineNr">204 </span>
<span id="L205" class="LineNr">205 </span><span class="subxFunction">print-byte-to-real-screen</span>:  <span class="subxComment"># c: byte</span>
<span id="L206" class="LineNr">206 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L207" class="LineNr">207 </span>    55/push-ebp
<span id="L208" class="LineNr">208 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L209" class="LineNr">209 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L210" class="LineNr">210 </span>    51/push-ecx
<span id="L211" class="LineNr">211 </span>    <span class="subxComment"># var s/ecx: (addr array byte)</span>
<span id="L212" class="LineNr">212 </span>    ff 6/subop/push *(ebp+8)
<span id="L213" class="LineNr">213 </span>    68/push 1/imm32/size
<span id="L214" class="LineNr">214 </span>    89/&lt;- %ecx 4/r32/esp
<span id="L215" class="LineNr">215 </span>    (<a href='108write.subx.html#L24'>write</a> 1 %ecx)
<span id="L216" class="LineNr">216 </span><span class="Constant">$print-byte-to-real-screen:end</span>:
<span id="L217" class="LineNr">217 </span>    <span class="subxS1Comment"># . reclaim locals</span>
<span id="L218" class="LineNr">218 </span>    81 0/subop/add %esp 8/imm32
<span id="L219" class="LineNr">219 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L220" class="LineNr">220 </span>    59/pop-to-ecx
<span id="L221" class="LineNr">221 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L222" class="LineNr">222 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L223" class="LineNr">223 </span>    5d/pop-to-ebp
<span id="L224" class="LineNr">224 </span>    c3/return
<span id="L225" class="LineNr">225 </span>
<span id="L226" class="LineNr">226 </span><span class="subxFunction">print-int32-hex-to-real-screen</span>:  <span class="subxComment"># n: int</span>
<span id="L227" class="LineNr">227 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L228" class="LineNr">228 </span>    55/push-ebp
<span id="L229" class="LineNr">229 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L230" class="LineNr">230 </span>    <span class="subxComment">#</span>
<span id="L231" class="LineNr">231 </span>    (<a href='117write-int-hex.subx.html#L288'>write-int32-hex-buffered</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span> *(ebp+8))
<span id="L232" class="LineNr">232 </span>    (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L233" class="LineNr">233 </span><span class="Constant">$print-int32-hex-to-real-screen:end</span>:
<span id="L234" class="LineNr">234 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L235" class="LineNr">235 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L236" class="LineNr">236 </span>    5d/pop-to-ebp
<span id="L237" class="LineNr">237 </span>    c3/return
<span id="L238" class="LineNr">238 </span>
<span id="L239" class="LineNr">239 </span><span class="subxFunction">print-int32-hex-bits-to-real-screen</span>:  <span class="subxComment"># n: int, bits: int</span>
<span id="L240" class="LineNr">240 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L241" class="LineNr">241 </span>    55/push-ebp
<span id="L242" class="LineNr">242 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L243" class="LineNr">243 </span>    <span class="subxComment">#</span>
<span id="L244" class="LineNr">244 </span>    (<a href='117write-int-hex.subx.html#L319'>write-int32-hex-bits-buffered</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span> *(ebp+8) *(ebp+0xc) *(ebp+0x10))
<span id="L245" class="LineNr">245 </span>    (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L246" class="LineNr">246 </span><span class="Constant">$print-int32-hex-bits-to-real-screen:end</span>:
<span id="L247" class="LineNr">247 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L248" class="LineNr">248 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L249" class="LineNr">249 </span>    5d/pop-to-ebp
<span id="L250" class="LineNr">250 </span>    c3/return
<span id="L251" class="LineNr">251 </span>
<span id="L252" class="LineNr">252 </span><span class="subxFunction">print-int32-decimal-to-real-screen</span>:  <span class="subxComment"># n: int</span>
<span id="L253" class="LineNr">253 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L254" class="LineNr">254 </span>    55/push-ebp
<span id="L255" class="LineNr">255 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L256" class="LineNr">256 </span>    <span class="subxComment">#</span>
<span id="L257" class="LineNr">257 </span>    (<a href='304screen.subx.html#L265'>write-int32-decimal-buffered</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span> *(ebp+8))
<span id="L258" class="LineNr">258 </span>    (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L259" class="LineNr">259 </span><span class="Constant">$print-int32-decimal-to-real-screen:end</span>:
<span id="L260" class="LineNr">260 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L261" class="LineNr">261 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L262" class="LineNr">262 </span>    5d/pop-to-ebp
<span id="L263" class="LineNr">263 </span>    c3/return
<span id="L264" class="LineNr">264 </span>
<span id="L265" class="LineNr">265 </span><span class="subxFunction">write-int32-decimal-buffered</span>:  <span class="subxComment"># f: (addr buffered-file), n: int</span>
<span id="L266" class="LineNr">266 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L267" class="LineNr">267 </span>    55/push-ebp
<span id="L268" class="LineNr">268 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L269" class="LineNr">269 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L270" class="LineNr">270 </span>    51/push-ecx
<span id="L271" class="LineNr">271 </span>    <span class="subxComment"># var ecx: (stream byte 16)</span>
<span id="L272" class="LineNr">272 </span>    81 5/subop/subtract %esp 0x10/imm32
<span id="L273" class="LineNr">273 </span>    68/push 0x10/imm32/size
<span id="L274" class="LineNr">274 </span>    68/push 0/imm32/read
<span id="L275" class="LineNr">275 </span>    68/push 0/imm32/write
<span id="L276" class="LineNr">276 </span>    89/&lt;- %ecx 4/r32/esp
<span id="L277" class="LineNr">277 </span>    (<a href='126write-int-decimal.subx.html#L8'>write-int32-decimal</a> %ecx *(ebp+0xc))
<span id="L278" class="LineNr">278 </span>    (<a href='125write-stream-data.subx.html#L11'>write-stream-data</a> *(ebp+8) %ecx)
<span id="L279" class="LineNr">279 </span><span class="Constant">$write-int32-decimal-buffered:end</span>:
<span id="L280" class="LineNr">280 </span>    <span class="subxS1Comment"># . reclaim locals</span>
<span id="L281" class="LineNr">281 </span>    81 0/subop/add %esp 0x1c/imm32
<span id="L282" class="LineNr">282 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L283" class="LineNr">283 </span>    59/pop-to-ecx
<span id="L284" class="LineNr">284 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L285" class="LineNr">285 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L286" class="LineNr">286 </span>    5d/pop-to-ebp
<span id="L287" class="LineNr">287 </span>    c3/return
<span id="L288" class="LineNr">288 </span>
<span id="L289" class="LineNr">289 </span><span class="subxFunction">reset-formatting-on-real-screen</span>:
<span id="L290" class="LineNr">290 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L291" class="LineNr">291 </span>    55/push-ebp
<span id="L292" class="LineNr">292 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L293" class="LineNr">293 </span>    <span class="subxComment">#</span>
<span id="L294" class="LineNr">294 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L295" class="LineNr">295 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;(B&quot;</span>)
<span id="L296" class="LineNr">296 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L297" class="LineNr">297 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[m&quot;</span>)
<span id="L298" class="LineNr">298 </span><span class="Constant">$reset-formatting-on-real-screen:end</span>:
<span id="L299" class="LineNr">299 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L300" class="LineNr">300 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L301" class="LineNr">301 </span>    5d/pop-to-ebp
<span id="L302" class="LineNr">302 </span>    c3/return
<span id="L303" class="LineNr">303 </span>
<span id="L304" class="LineNr">304 </span><span class="subxFunction">start-color-on-real-screen</span>:  <span class="subxComment"># fg: int, bg: int</span>
<span id="L305" class="LineNr">305 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L306" class="LineNr">306 </span>    55/push-ebp
<span id="L307" class="LineNr">307 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L308" class="LineNr">308 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L309" class="LineNr">309 </span>    51/push-ecx
<span id="L310" class="LineNr">310 </span>    <span class="subxComment"># var buf/ecx: (stream byte 32)</span>
<span id="L311" class="LineNr">311 </span>    81 5/subop/subtract %esp 0x20/imm32
<span id="L312" class="LineNr">312 </span>    68/push 0x20/imm32/size
<span id="L313" class="LineNr">313 </span>    68/push 0/imm32/read
<span id="L314" class="LineNr">314 </span>    68/push 0/imm32/write
<span id="L315" class="LineNr">315 </span>    89/&lt;- %ecx 4/r32/esp
<span id="L316" class="LineNr">316 </span>    <span class="subxComment"># construct directive in buf</span>
<span id="L317" class="LineNr">317 </span>    <span class="subxS1Comment"># . set fg</span>
<span id="L318" class="LineNr">318 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L319" class="LineNr">319 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">&quot;[38;5;&quot;</span>)
<span id="L320" class="LineNr">320 </span>    (<a href='126write-int-decimal.subx.html#L8'>write-int32-decimal</a> %ecx *(ebp+8))
<span id="L321" class="LineNr">321 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">&quot;m&quot;</span>)
<span id="L322" class="LineNr">322 </span>    <span class="subxS1Comment"># . set bg</span>
<span id="L323" class="LineNr">323 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L324" class="LineNr">324 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">&quot;[48;5;&quot;</span>)
<span id="L325" class="LineNr">325 </span>    (<a href='126write-int-decimal.subx.html#L8'>write-int32-decimal</a> %ecx *(ebp+0xc))
<span id="L326" class="LineNr">326 </span>    (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">&quot;m&quot;</span>)
<span id="L327" class="LineNr">327 </span>    <span class="subxComment"># flush</span>
<span id="L328" class="LineNr">328 </span>    (<a href='113write-stream.subx.html#L17'>write-stream</a> 2 %ecx)
<span id="L329" class="LineNr">329 </span><span class="Constant">$start-color-on-real-screen:end</span>:
<span id="L330" class="LineNr">330 </span>    <span class="subxS1Comment"># . reclaim locals</span>
<span id="L331" class="LineNr">331 </span>    81 0/subop/add %esp 0x2c/imm32
<span id="L332" class="LineNr">332 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L333" class="LineNr">333 </span>    59/pop-to-ecx
<span id="L334" class="LineNr">334 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L335" class="LineNr">335 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L336" class="LineNr">336 </span>    5d/pop-to-ebp
<span id="L337" class="LineNr">337 </span>    c3/return
<span id="L338" class="LineNr">338 </span>
<span id="L339" class="LineNr">339 </span><span class="subxFunction">start-bold-on-real-screen</span>:
<span id="L340" class="LineNr">340 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L341" class="LineNr">341 </span>    55/push-ebp
<span id="L342" class="LineNr">342 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L343" class="LineNr">343 </span>    <span class="subxComment">#</span>
<span id="L344" class="LineNr">344 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L345" class="LineNr">345 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[1m&quot;</span>)
<span id="L346" class="LineNr">346 </span><span class="Constant">$start-bold-on-real-screen:end</span>:
<span id="L347" class="LineNr">347 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L348" class="LineNr">348 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L349" class="LineNr">349 </span>    5d/pop-to-ebp
<span id="L350" class="LineNr">350 </span>    c3/return
<span id="L351" class="LineNr">351 </span>
<span id="L352" class="LineNr">352 </span><span class="subxFunction">start-underline-on-real-screen</span>:
<span id="L353" class="LineNr">353 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L354" class="LineNr">354 </span>    55/push-ebp
<span id="L355" class="LineNr">355 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L356" class="LineNr">356 </span>    <span class="subxComment">#</span>
<span id="L357" class="LineNr">357 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L358" class="LineNr">358 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[4m&quot;</span>)
<span id="L359" class="LineNr">359 </span><span class="Constant">$start-underline-on-real-screen:end</span>:
<span id="L360" class="LineNr">360 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L361" class="LineNr">361 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L362" class="LineNr">362 </span>    5d/pop-to-ebp
<span id="L363" class="LineNr">363 </span>    c3/return
<span id="L364" class="LineNr">364 </span>
<span id="L365" class="LineNr">365 </span><span class="subxFunction">start-reverse-video-on-real-screen</span>:
<span id="L366" class="LineNr">366 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L367" class="LineNr">367 </span>    55/push-ebp
<span id="L368" class="LineNr">368 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L369" class="LineNr">369 </span>    <span class="subxComment">#</span>
<span id="L370" class="LineNr">370 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L371" class="LineNr">371 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[7m&quot;</span>)
<span id="L372" class="LineNr">372 </span><span class="Constant">$start-reverse-video-on-real-screen:end</span>:
<span id="L373" class="LineNr">373 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L374" class="LineNr">374 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L375" class="LineNr">375 </span>    5d/pop-to-ebp
<span id="L376" class="LineNr">376 </span>    c3/return
<span id="L377" class="LineNr">377 </span>
<span id="L378" class="LineNr">378 </span><span class="subxComment"># might require enabling blinking in your terminal program</span>
<span id="L379" class="LineNr">379 </span><span class="subxFunction">start-blinking-on-real-screen</span>:
<span id="L380" class="LineNr">380 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L381" class="LineNr">381 </span>    55/push-ebp
<span id="L382" class="LineNr">382 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L383" class="LineNr">383 </span>    <span class="subxComment">#</span>
<span id="L384" class="LineNr">384 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L385" class="LineNr">385 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[5m&quot;</span>)
<span id="L386" class="LineNr">386 </span><span class="Constant">$start-blinking-on-real-screen:end</span>:
<span id="L387" class="LineNr">387 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L388" class="LineNr">388 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L389" class="LineNr">389 </span>    5d/pop-to-ebp
<span id="L390" class="LineNr">390 </span>    c3/return
<span id="L391" class="LineNr">391 </span>
<span id="L392" class="LineNr">392 </span><span class="subxFunction">hide-cursor-on-real-screen</span>:
<span id="L393" class="LineNr">393 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L394" class="LineNr">394 </span>    55/push-ebp
<span id="L395" class="LineNr">395 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L396" class="LineNr">396 </span>    <span class="subxComment">#</span>
<span id="L397" class="LineNr">397 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L398" class="LineNr">398 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[?25l&quot;</span>)
<span id="L399" class="LineNr">399 </span><span class="Constant">$hide-cursor-on-real-screen:end</span>:
<span id="L400" class="LineNr">400 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L401" class="LineNr">401 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L402" class="LineNr">402 </span>    5d/pop-to-ebp
<span id="L403" class="LineNr">403 </span>    c3/return
<span id="L404" class="LineNr">404 </span>
<span id="L405" class="LineNr">405 </span><span class="subxFunction">show-cursor-on-real-screen</span>:
<span id="L406" class="LineNr">406 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L407" class="LineNr">407 </span>    55/push-ebp
<span id="L408" class="LineNr">408 </span>    89/&lt;- %ebp 4/r32/esp
<span id="L409" class="LineNr">409 </span>    <span class="subxComment">#</span>
<span id="L410" class="LineNr">410 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L411" class="LineNr">411 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[?12l&quot;</span>)
<span id="L412" class="LineNr">412 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="SpecialChar"><a href='304screen.subx.html#L449'>Esc</a></span>)
<span id="L413" class="LineNr">413 </span>    (<a href='108write.subx.html#L24'>write</a> 1 <span class="Constant">&quot;[?25h&quot;</span>)
<span id="L414" class="LineNr">414 </span><span class="Constant">$show-cursor-on-real-screen:end</span>:
<span id="L415" class="LineNr">415 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L416" class="LineNr">416 </span>    89/&lt;- %esp 5/r32/ebp
<span id="L417" class="LineNr">417 </span>    5d/pop-to-ebp
<span id="L418" class="LineNr">418 </span>    c3/return
<span id="L419" class="LineNr">419 </span>
<span id="L420" class="LineNr">420 </span><span class="subxComment"># This is a low-level detail; I don't think everything should be a file.</span>
<span id="L421" class="LineNr">421 </span><span class="subxComment">#</span>
<span id="L422" class="LineNr">422 </span><span class="subxComment"># Open &quot;/dev/tty&quot; if necessary and cache its file descriptor in Terminal-file-descriptor</span>
<span id="L423" class="LineNr">423 </span><span class="subxComment"># where later primitives can use it.</span>
<span id="L424" class="LineNr">424 </span><span class="subxMinorFunction">_maybe-open-terminal</span>:
<span id="L425" class="LineNr">425 </span>    81 7/subop/compare *<span class="SpecialChar"><a href='304screen.subx.html#L446'>Terminal-file-descriptor</a></span> -1/imm32
<span id="L426" class="LineNr">426 </span>    75/jump-if-!= $_maybe-open-terminal:epilogue/disp8
<span id="L427" class="LineNr">427 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L428" class="LineNr">428 </span>    50/push-eax
<span id="L429" class="LineNr">429 </span>    51/push-ecx
<span id="L430" class="LineNr">430 </span>    53/push-ebx
<span id="L431" class="LineNr">431 </span>    <span class="subxComment"># open(&quot;/dev/tty&quot;, O_RDWR)</span>
<span id="L432" class="LineNr">432 </span>    bb/copy-to-ebx <span class="SpecialChar"><a href='304screen.subx.html#L455'>Terminal-filename</a></span>/imm32
<span id="L433" class="LineNr">433 </span>    b9/copy-to-ecx 2/imm32/O_RDWR
<span id="L434" class="LineNr">434 </span>    e8/call syscall_open/disp32
<span id="L435" class="LineNr">435 </span>    89/&lt;- *<span class="SpecialChar"><a href='304screen.subx.html#L446'>Terminal-file-descriptor</a></span> 0/r32/eax
<span id="L436" class="LineNr">436 </span><span class="Constant">$_maybe-open-terminal:end</span>:
<span id="L437" class="LineNr">437 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L438" class="LineNr">438 </span>    5b/pop-to-ebx
<span id="L439" class="LineNr">439 </span>    59/pop-to-ecx
<span id="L440" class="LineNr">440 </span>    58/pop-to-eax
<span id="L441" class="LineNr">441 </span><span class="Constant">$_maybe-open-terminal:epilogue</span>:
<span id="L442" class="LineNr">442 </span>    c3/return
<span id="L443" class="LineNr">443 </span>
<span id="L444" class="LineNr">444 </span>== data
<span id="L445" class="LineNr">445 </span>
<span id="L446" class="LineNr">446 </span><span class="SpecialChar">Terminal-file-descriptor</span>:  <span class="subxComment"># (addr int)</span>
<span id="L447" class="LineNr">447 </span>  -1/imm32
<span id="L448" class="LineNr">448 </span>
<span id="L449" class="LineNr">449 </span><span class="SpecialChar">Esc</span>:  <span class="subxComment"># (addr array byte)</span>
<span id="L450" class="LineNr">450 </span>  <span class="subxComment"># size</span>
<span id="L451" class="LineNr">451 </span>  1/imm32
<span id="L452" class="LineNr">452 </span>  <span class="subxComment"># data</span>
<span id="L453" class="LineNr">453 </span>  0x1b
<span id="L454" class="LineNr">454 </span>
<span id="L455" class="LineNr">455 </span><span class="SpecialChar">Terminal-filename</span>:  <span class="subxComment"># (addr kernel-string)</span>
<span id="L456" class="LineNr">456 </span>  <span class="subxComment"># &quot;/dev/null&quot;</span>
<span id="L457" class="LineNr">457 </span>  2f/slash 64/d 65/e 76/v 2f/slash 74/t 74/t 79/y 0/nul
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