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<title>Mu - 304screen.subx</title>
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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/<- %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> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L15" class="LineNr"> 15 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[?1049h"</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-screen</a>)
<span id="L18" class="LineNr"> 18 </span><span class="Constant">$enable-screen-grid-mode:end</span>:
<span id="L19" class="LineNr"> 19 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L20" class="LineNr"> 20 </span> 89/<- %esp 5/r32/ebp
<span id="L21" class="LineNr"> 21 </span> 5d/pop-to-ebp
<span id="L22" class="LineNr"> 22 </span> c3/return
<span id="L23" class="LineNr"> 23 </span>
<span id="L24" class="LineNr"> 24 </span><span class="subxFunction">enable-screen-type-mode</span>:
<span id="L25" class="LineNr"> 25 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L26" class="LineNr"> 26 </span> 55/push-ebp
<span id="L27" class="LineNr"> 27 </span> 89/<- %ebp 4/r32/esp
<span id="L28" class="LineNr"> 28 </span> <span class="subxComment"># switch to first screen buffer</span>
<span id="L29" class="LineNr"> 29 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L30" class="LineNr"> 30 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[?1049l"</span>)
<span id="L31" class="LineNr"> 31 </span><span class="Constant">$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/<- %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">screen-size</span>: <span class="subxComment"># -> 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/<- %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#L303'>_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/<- %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/<- %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/-> *<span class="SpecialChar"><a href='304screen.subx.html#L325'>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/-> *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/-> *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">$screen-size:end</span>:
<span id="L63" class="LineNr"> 63 </span> <span class="subxS1Comment"># . reclaim locals</span>
<span id="L64" class="LineNr"> 64 </span> 81 0/subop/add %esp 0x40/imm32
<span id="L65" class="LineNr"> 65 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L66" class="LineNr"> 66 </span> 5f/pop-to-edi
<span id="L67" class="LineNr"> 67 </span> 5e/pop-to-esi
<span id="L68" class="LineNr"> 68 </span> 5b/pop-to-ebx
<span id="L69" class="LineNr"> 69 </span> 5a/pop-to-edx
<span id="L70" class="LineNr"> 70 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L71" class="LineNr"> 71 </span> 89/<- %esp 5/r32/ebp
<span id="L72" class="LineNr"> 72 </span> 5d/pop-to-ebp
<span id="L73" class="LineNr"> 73 </span> c3/return
<span id="L74" class="LineNr"> 74 </span>
<span id="L75" class="LineNr"> 75 </span><span class="subxFunction">clear-screen</span>:
<span id="L76" class="LineNr"> 76 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L77" class="LineNr"> 77 </span> 55/push-ebp
<span id="L78" class="LineNr"> 78 </span> 89/<- %ebp 4/r32/esp
<span id="L79" class="LineNr"> 79 </span> <span class="subxComment">#</span>
<span id="L80" class="LineNr"> 80 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L81" class="LineNr"> 81 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[H"</span>)
<span id="L82" class="LineNr"> 82 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L83" class="LineNr"> 83 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[2J"</span>)
<span id="L84" class="LineNr"> 84 </span><span class="Constant">$clear-screen:end</span>:
<span id="L85" class="LineNr"> 85 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L86" class="LineNr"> 86 </span> 89/<- %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-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/<- %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/<- %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#L328'>Esc</a></span>)
<span id="L105" class="LineNr">105 </span> (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">"["</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">";"</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">"H"</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">$move-cursor-on-screen:end</span>:
<span id="L113" class="LineNr">113 </span> <span class="subxS1Comment"># . reclaim locals</span>
<span id="L114" class="LineNr">114 </span> 81 0/subop/add %esp 0x2c/imm32
<span id="L115" class="LineNr">115 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L116" class="LineNr">116 </span> 59/pop-to-ecx
<span id="L117" class="LineNr">117 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L118" class="LineNr">118 </span> 89/<- %esp 5/r32/ebp
<span id="L119" class="LineNr">119 </span> 5d/pop-to-ebp
<span id="L120" class="LineNr">120 </span> c3/return
<span id="L121" class="LineNr">121 </span>
<span id="L122" class="LineNr">122 </span><span class="subxFunction">print-string-to-screen</span>: <span class="subxComment"># s: (addr array byte)</span>
<span id="L123" class="LineNr">123 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L124" class="LineNr">124 </span> 55/push-ebp
<span id="L125" class="LineNr">125 </span> 89/<- %ebp 4/r32/esp
<span id="L126" class="LineNr">126 </span> <span class="subxComment">#</span>
<span id="L127" class="LineNr">127 </span> (<a href='108write.subx.html#L24'>write</a> 2 *(ebp+8))
<span id="L128" class="LineNr">128 </span><span class="Constant">$print-string-to-screen:end</span>:
<span id="L129" class="LineNr">129 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L130" class="LineNr">130 </span> 89/<- %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-byte-to-screen</span>: <span class="subxComment"># c: byte</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/<- %ebp 4/r32/esp
<span id="L138" class="LineNr">138 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L139" class="LineNr">139 </span> 51/push-ecx
<span id="L140" class="LineNr">140 </span> <span class="subxComment"># var s/ecx: (addr array byte)</span>
<span id="L141" class="LineNr">141 </span> ff 6/subop/push *(ebp+8)
<span id="L142" class="LineNr">142 </span> 68/push 4/imm32/size
<span id="L143" class="LineNr">143 </span> 89/<- %ecx 4/r32/esp
<span id="L144" class="LineNr">144 </span> (<a href='108write.subx.html#L24'>write</a> 2 %ecx)
<span id="L145" class="LineNr">145 </span><span class="Constant">$print-byte-to-screen:end</span>:
<span id="L146" class="LineNr">146 </span> <span class="subxS1Comment"># . reclaim locals</span>
<span id="L147" class="LineNr">147 </span> 81 0/subop/add %esp 8/imm32
<span id="L148" class="LineNr">148 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L149" class="LineNr">149 </span> 59/pop-to-ecx
<span id="L150" class="LineNr">150 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L151" class="LineNr">151 </span> 89/<- %esp 5/r32/ebp
<span id="L152" class="LineNr">152 </span> 5d/pop-to-ebp
<span id="L153" class="LineNr">153 </span> c3/return
<span id="L154" class="LineNr">154 </span>
<span id="L155" class="LineNr">155 </span><span class="subxFunction">print-int32-hex-to-screen</span>: <span class="subxComment"># n: int</span>
<span id="L156" class="LineNr">156 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L157" class="LineNr">157 </span> 55/push-ebp
<span id="L158" class="LineNr">158 </span> 89/<- %ebp 4/r32/esp
<span id="L159" class="LineNr">159 </span> <span class="subxComment">#</span>
<span id="L160" class="LineNr">160 </span> (<a href='117write-int-hex.subx.html#L266'>write-int32-hex-buffered</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span> *(ebp+8))
<span id="L161" class="LineNr">161 </span> (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='115write-byte.subx.html#L10'>Stdout</a></span>)
<span id="L162" class="LineNr">162 </span><span class="Constant">$print-int32-hex-to-screen:end</span>:
<span id="L163" class="LineNr">163 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L164" class="LineNr">164 </span> 89/<- %esp 5/r32/ebp
<span id="L165" class="LineNr">165 </span> 5d/pop-to-ebp
<span id="L166" class="LineNr">166 </span> c3/return
<span id="L167" class="LineNr">167 </span>
<span id="L168" class="LineNr">168 </span><span class="subxFunction">reset-formatting-on-screen</span>:
<span id="L169" class="LineNr">169 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L170" class="LineNr">170 </span> 55/push-ebp
<span id="L171" class="LineNr">171 </span> 89/<- %ebp 4/r32/esp
<span id="L172" class="LineNr">172 </span> <span class="subxComment">#</span>
<span id="L173" class="LineNr">173 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L174" class="LineNr">174 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"(B"</span>)
<span id="L175" class="LineNr">175 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L176" class="LineNr">176 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[m"</span>)
<span id="L177" class="LineNr">177 </span><span class="Constant">$reset-formatting-on-screen:end</span>:
<span id="L178" class="LineNr">178 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L179" class="LineNr">179 </span> 89/<- %esp 5/r32/ebp
<span id="L180" class="LineNr">180 </span> 5d/pop-to-ebp
<span id="L181" class="LineNr">181 </span> c3/return
<span id="L182" class="LineNr">182 </span>
<span id="L183" class="LineNr">183 </span><span class="subxFunction">start-color-on-screen</span>: <span class="subxComment"># fg: int, bg: int</span>
<span id="L184" class="LineNr">184 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L185" class="LineNr">185 </span> 55/push-ebp
<span id="L186" class="LineNr">186 </span> 89/<- %ebp 4/r32/esp
<span id="L187" class="LineNr">187 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L188" class="LineNr">188 </span> 51/push-ecx
<span id="L189" class="LineNr">189 </span> <span class="subxComment"># var buf/ecx: (stream byte 32)</span>
<span id="L190" class="LineNr">190 </span> 81 5/subop/subtract %esp 0x20/imm32
<span id="L191" class="LineNr">191 </span> 68/push 0x20/imm32/size
<span id="L192" class="LineNr">192 </span> 68/push 0/imm32/read
<span id="L193" class="LineNr">193 </span> 68/push 0/imm32/write
<span id="L194" class="LineNr">194 </span> 89/<- %ecx 4/r32/esp
<span id="L195" class="LineNr">195 </span> <span class="subxComment"># construct directive in buf</span>
<span id="L196" class="LineNr">196 </span> <span class="subxS1Comment"># . set fg</span>
<span id="L197" class="LineNr">197 </span> (<a href='108write.subx.html#L24'>write</a> %ecx <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L198" class="LineNr">198 </span> (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">"[38;5;"</span>)
<span id="L199" class="LineNr">199 </span> (<a href='126write-int-decimal.subx.html#L8'>write-int32-decimal</a> %ecx *(ebp+8))
<span id="L200" class="LineNr">200 </span> (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">"m"</span>)
<span id="L201" class="LineNr">201 </span> <span class="subxS1Comment"># . set bg</span>
<span id="L202" class="LineNr">202 </span> (<a href='108write.subx.html#L24'>write</a> %ecx <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L203" class="LineNr">203 </span> (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">"[48;5;"</span>)
<span id="L204" class="LineNr">204 </span> (<a href='126write-int-decimal.subx.html#L8'>write-int32-decimal</a> %ecx *(ebp+0xc))
<span id="L205" class="LineNr">205 </span> (<a href='108write.subx.html#L24'>write</a> %ecx <span class="Constant">"m"</span>)
<span id="L206" class="LineNr">206 </span> <span class="subxComment"># flush</span>
<span id="L207" class="LineNr">207 </span> (<a href='113write-stream.subx.html#L17'>write-stream</a> 2 %ecx)
<span id="L208" class="LineNr">208 </span><span class="Constant">$start-color-on-screen:end</span>:
<span id="L209" class="LineNr">209 </span> <span class="subxS1Comment"># . reclaim locals</span>
<span id="L210" class="LineNr">210 </span> 81 0/subop/add %esp 0x2c/imm32
<span id="L211" class="LineNr">211 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L212" class="LineNr">212 </span> 59/pop-to-ecx
<span id="L213" class="LineNr">213 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L214" class="LineNr">214 </span> 89/<- %esp 5/r32/ebp
<span id="L215" class="LineNr">215 </span> 5d/pop-to-ebp
<span id="L216" class="LineNr">216 </span> c3/return
<span id="L217" class="LineNr">217 </span>
<span id="L218" class="LineNr">218 </span><span class="subxFunction">start-bold-on-screen</span>:
<span id="L219" class="LineNr">219 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L220" class="LineNr">220 </span> 55/push-ebp
<span id="L221" class="LineNr">221 </span> 89/<- %ebp 4/r32/esp
<span id="L222" class="LineNr">222 </span> <span class="subxComment">#</span>
<span id="L223" class="LineNr">223 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L224" class="LineNr">224 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[1m"</span>)
<span id="L225" class="LineNr">225 </span><span class="Constant">$start-bold-on-screen:end</span>:
<span id="L226" class="LineNr">226 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L227" class="LineNr">227 </span> 89/<- %esp 5/r32/ebp
<span id="L228" class="LineNr">228 </span> 5d/pop-to-ebp
<span id="L229" class="LineNr">229 </span> c3/return
<span id="L230" class="LineNr">230 </span>
<span id="L231" class="LineNr">231 </span><span class="subxFunction">start-underline-on-screen</span>:
<span id="L232" class="LineNr">232 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L233" class="LineNr">233 </span> 55/push-ebp
<span id="L234" class="LineNr">234 </span> 89/<- %ebp 4/r32/esp
<span id="L235" class="LineNr">235 </span> <span class="subxComment">#</span>
<span id="L236" class="LineNr">236 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L237" class="LineNr">237 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[4m"</span>)
<span id="L238" class="LineNr">238 </span><span class="Constant">$start-underline-on-screen:end</span>:
<span id="L239" class="LineNr">239 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L240" class="LineNr">240 </span> 89/<- %esp 5/r32/ebp
<span id="L241" class="LineNr">241 </span> 5d/pop-to-ebp
<span id="L242" class="LineNr">242 </span> c3/return
<span id="L243" class="LineNr">243 </span>
<span id="L244" class="LineNr">244 </span><span class="subxFunction">start-reverse-video-on-screen</span>:
<span id="L245" class="LineNr">245 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L246" class="LineNr">246 </span> 55/push-ebp
<span id="L247" class="LineNr">247 </span> 89/<- %ebp 4/r32/esp
<span id="L248" class="LineNr">248 </span> <span class="subxComment">#</span>
<span id="L249" class="LineNr">249 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L250" class="LineNr">250 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[7m"</span>)
<span id="L251" class="LineNr">251 </span><span class="Constant">$start-reverse-video-on-screen:end</span>:
<span id="L252" class="LineNr">252 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L253" class="LineNr">253 </span> 89/<- %esp 5/r32/ebp
<span id="L254" class="LineNr">254 </span> 5d/pop-to-ebp
<span id="L255" class="LineNr">255 </span> c3/return
<span id="L256" class="LineNr">256 </span>
<span id="L257" class="LineNr">257 </span><span class="subxComment"># might require enabling blinking in your terminal program</span>
<span id="L258" class="LineNr">258 </span><span class="subxFunction">start-blinking-on-screen</span>:
<span id="L259" class="LineNr">259 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L260" class="LineNr">260 </span> 55/push-ebp
<span id="L261" class="LineNr">261 </span> 89/<- %ebp 4/r32/esp
<span id="L262" class="LineNr">262 </span> <span class="subxComment">#</span>
<span id="L263" class="LineNr">263 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L264" class="LineNr">264 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[5m"</span>)
<span id="L265" class="LineNr">265 </span><span class="Constant">$start-blinking-on-screen:end</span>:
<span id="L266" class="LineNr">266 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L267" class="LineNr">267 </span> 89/<- %esp 5/r32/ebp
<span id="L268" class="LineNr">268 </span> 5d/pop-to-ebp
<span id="L269" class="LineNr">269 </span> c3/return
<span id="L270" class="LineNr">270 </span>
<span id="L271" class="LineNr">271 </span><span class="subxFunction">hide-cursor-on-screen</span>:
<span id="L272" class="LineNr">272 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L273" class="LineNr">273 </span> 55/push-ebp
<span id="L274" class="LineNr">274 </span> 89/<- %ebp 4/r32/esp
<span id="L275" class="LineNr">275 </span> <span class="subxComment">#</span>
<span id="L276" class="LineNr">276 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L277" class="LineNr">277 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[?25l"</span>)
<span id="L278" class="LineNr">278 </span><span class="Constant">$hide-cursor-on-screen:end</span>:
<span id="L279" class="LineNr">279 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L280" class="LineNr">280 </span> 89/<- %esp 5/r32/ebp
<span id="L281" class="LineNr">281 </span> 5d/pop-to-ebp
<span id="L282" class="LineNr">282 </span> c3/return
<span id="L283" class="LineNr">283 </span>
<span id="L284" class="LineNr">284 </span><span class="subxFunction">show-cursor-on-screen</span>:
<span id="L285" class="LineNr">285 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L286" class="LineNr">286 </span> 55/push-ebp
<span id="L287" class="LineNr">287 </span> 89/<- %ebp 4/r32/esp
<span id="L288" class="LineNr">288 </span> <span class="subxComment">#</span>
<span id="L289" class="LineNr">289 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L290" class="LineNr">290 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[?12l"</span>)
<span id="L291" class="LineNr">291 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="SpecialChar"><a href='304screen.subx.html#L328'>Esc</a></span>)
<span id="L292" class="LineNr">292 </span> (<a href='108write.subx.html#L24'>write</a> 2 <span class="Constant">"[?25h"</span>)
<span id="L293" class="LineNr">293 </span><span class="Constant">$show-cursor-on-screen:end</span>:
<span id="L294" class="LineNr">294 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L295" class="LineNr">295 </span> 89/<- %esp 5/r32/ebp
<span id="L296" class="LineNr">296 </span> 5d/pop-to-ebp
<span id="L297" class="LineNr">297 </span> c3/return
<span id="L298" class="LineNr">298 </span>
<span id="L299" class="LineNr">299 </span><span class="subxComment"># This is a low-level detail; I don't think everything should be a file.</span>
<span id="L300" class="LineNr">300 </span><span class="subxComment">#</span>
<span id="L301" class="LineNr">301 </span><span class="subxComment"># Open "/dev/tty" if necessary and cache its file descriptor in Terminal-file-descriptor</span>
<span id="L302" class="LineNr">302 </span><span class="subxComment"># where later primitives can use it.</span>
<span id="L303" class="LineNr">303 </span><span class="subxMinorFunction">_maybe-open-terminal</span>:
<span id="L304" class="LineNr">304 </span> 81 7/subop/compare *<span class="SpecialChar"><a href='304screen.subx.html#L325'>Terminal-file-descriptor</a></span> -1/imm32
<span id="L305" class="LineNr">305 </span> 75/jump-if-!= $_maybe-open-terminal:epilogue/disp8
<span id="L306" class="LineNr">306 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L307" class="LineNr">307 </span> 50/push-eax
<span id="L308" class="LineNr">308 </span> 51/push-ecx
<span id="L309" class="LineNr">309 </span> 53/push-ebx
<span id="L310" class="LineNr">310 </span> <span class="subxComment"># open("/dev/tty", O_RDWR)</span>
<span id="L311" class="LineNr">311 </span> bb/copy-to-ebx <span class="SpecialChar"><a href='304screen.subx.html#L334'>Terminal-filename</a></span>/imm32
<span id="L312" class="LineNr">312 </span> b9/copy-to-ecx 2/imm32/O_RDWR
<span id="L313" class="LineNr">313 </span> e8/call syscall_open/disp32
<span id="L314" class="LineNr">314 </span> 89/<- *<span class="SpecialChar"><a href='304screen.subx.html#L325'>Terminal-file-descriptor</a></span> 0/r32/eax
<span id="L315" class="LineNr">315 </span><span class="Constant">$_maybe-open-terminal:end</span>:
<span id="L316" class="LineNr">316 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L317" class="LineNr">317 </span> 5b/pop-to-ebx
<span id="L318" class="LineNr">318 </span> 59/pop-to-ecx
<span id="L319" class="LineNr">319 </span> 58/pop-to-eax
<span id="L320" class="LineNr">320 </span><span class="Constant">$_maybe-open-terminal:epilogue</span>:
<span id="L321" class="LineNr">321 </span> c3/return
<span id="L322" class="LineNr">322 </span>
<span id="L323" class="LineNr">323 </span>== data
<span id="L324" class="LineNr">324 </span>
<span id="L325" class="LineNr">325 </span><span class="SpecialChar">Terminal-file-descriptor</span>: <span class="subxComment"># (addr int)</span>
<span id="L326" class="LineNr">326 </span> -1/imm32
<span id="L327" class="LineNr">327 </span>
<span id="L328" class="LineNr">328 </span><span class="SpecialChar">Esc</span>: <span class="subxComment"># (addr array byte)</span>
<span id="L329" class="LineNr">329 </span> <span class="subxComment"># size</span>
<span id="L330" class="LineNr">330 </span> 1/imm32
<span id="L331" class="LineNr">331 </span> <span class="subxComment"># data</span>
<span id="L332" class="LineNr">332 </span> 0x1b
<span id="L333" class="LineNr">333 </span>
<span id="L334" class="LineNr">334 </span><span class="SpecialChar">Terminal-filename</span>: <span class="subxComment"># (addr kernel-string)</span>
<span id="L335" class="LineNr">335 </span> <span class="subxComment"># "/dev/null"</span>
<span id="L336" class="LineNr">336 </span> 2f/slash 64/d 65/e 76/v 2f/slash 74/t 74/t 79/y 0/nul
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