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authorKartik Agaram <vc@akkartik.com>2018-11-26 01:19:47 -0800
committerKartik Agaram <vc@akkartik.com>2018-11-26 01:19:47 -0800
commitd1c9392a5461e0d33e226375a8f7986a97d2d66b (patch)
tree494c19edbe1d1522344b56ced6aa7c040ad37406 /html/subx/059read-byte.subx.html
parent7e00968c99f97e13be8f5269feaf7fd1d33ecd33 (diff)
downloadmu-d1c9392a5461e0d33e226375a8f7986a97d2d66b.tar.gz
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+<span id="L1" class="LineNr">  1 </span><span class="Comment"># read-byte: one higher-level abstraction atop 'read'.</span>
+<span id="L2" class="LineNr">  2 </span><span class="Comment">#</span>
+<span id="L3" class="LineNr">  3 </span><span class="Comment"># There are many situations where 'read' is a lot to manage, and we need</span>
+<span id="L4" class="LineNr">  4 </span><span class="Comment"># to abstract some details away. One of them is when we want to read a file</span>
+<span id="L5" class="LineNr">  5 </span><span class="Comment"># character by character. In this situation we follow C's FILE data structure,</span>
+<span id="L6" class="LineNr">  6 </span><span class="Comment"># which manages the underlying file descriptor together with the buffer it</span>
+<span id="L7" class="LineNr">  7 </span><span class="Comment"># reads into. We call our version 'buffered-file'. Should be useful with other</span>
+<span id="L8" class="LineNr">  8 </span><span class="Comment"># primitives as well, in later layers.</span>
+<span id="L9" class="LineNr">  9 </span>
+<span id="L10" class="LineNr"> 10 </span>== data
+<span id="L11" class="LineNr"> 11 </span>
+<span id="L12" class="LineNr"> 12 </span><span class="Comment"># The buffered file for standard input. Also illustrates the layout for</span>
+<span id="L13" class="LineNr"> 13 </span><span class="Comment"># buffered-file.</span>
+<span id="L14" class="LineNr"> 14 </span>
+<span id="L15" class="LineNr"> 15 </span><span class="Special">Stdin</span>:
+<span id="L16" class="LineNr"> 16 </span>  <span class="Comment"># file descriptor or (address stream)</span>
+<span id="L17" class="LineNr"> 17 </span>  00 00 00 00  <span class="Comment"># 0 = standard input</span>
+<span id="L18" class="LineNr"> 18 </span>  <span class="Comment"># current write index</span>
+<span id="L19" class="LineNr"> 19 </span>  00 00 00 00
+<span id="L20" class="LineNr"> 20 </span>  <span class="Comment"># current read index</span>
+<span id="L21" class="LineNr"> 21 </span>  00 00 00 00
+<span id="L22" class="LineNr"> 22 </span>  <span class="Comment"># length (8)</span>
+<span id="L23" class="LineNr"> 23 </span>  08 00 00 00
+<span id="L24" class="LineNr"> 24 </span>  <span class="Comment"># data</span>
+<span id="L25" class="LineNr"> 25 </span>  00 00 00 00 00 00 00 00  <span class="Comment"># 8 bytes</span>
+<span id="L26" class="LineNr"> 26 </span>
+<span id="L27" class="LineNr"> 27 </span><span class="Comment"># TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency.</span>
+<span id="L28" class="LineNr"> 28 </span>
+<span id="L29" class="LineNr"> 29 </span>== code
+<span id="L30" class="LineNr"> 30 </span><span class="Comment"># instruction                     effective address                                                   operand     displacement    immediate</span>
+<span id="L31" class="LineNr"> 31 </span><span class="Comment"># op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L32" class="LineNr"> 32 </span><span class="Comment"># 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes</span>
+<span id="L33" class="LineNr"> 33 </span>
+<span id="L34" class="LineNr"> 34 </span><span class="Comment"># main:</span>
+<span id="L35" class="LineNr"> 35 </span>  e8/call  run-tests/disp32  <span class="Comment"># 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.</span>
+<span id="L36" class="LineNr"> 36 </span><span class="CommentedCode">#?   e8/call  test-read-byte-multiple/disp32</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Comment"># syscall(exit, Num-test-failures)</span>
+<span id="L38" class="LineNr"> 38 </span>  8b/copy                         0/mod/indirect  5/rm32/.disp32           <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          3/r32/EBX   <span class="Special">Num-test-failures</span>/disp32          <span class="Comment"># copy *Num-test-failures to EBX</span>
+<span id="L39" class="LineNr"> 39 </span>  b8/copy-to-EAX  1/imm32
+<span id="L40" class="LineNr"> 40 </span>  cd/syscall  0x80/imm8
+<span id="L41" class="LineNr"> 41 </span>
+<span id="L42" class="LineNr"> 42 </span><span class="Comment"># return next byte value in EAX, with top 3 bytes cleared.</span>
+<span id="L43" class="LineNr"> 43 </span><span class="Comment"># On EOF, return 0xffffffff.</span>
+<span id="L44" class="LineNr"> 44 </span>read-byte:  <span class="Comment"># f : (address buffered-file) -&gt; byte/EAX</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Comment"># prolog</span>
+<span id="L46" class="LineNr"> 46 </span>  55/push-EBP
+<span id="L47" class="LineNr"> 47 </span>  89/copy                         3/mod/direct    5/rm32/EBP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          4/r32/ESP  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># copy ESP to EBP</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Comment"># save registers</span>
+<span id="L49" class="LineNr"> 49 </span>  51/push-ECX
+<span id="L50" class="LineNr"> 50 </span>  56/push-ESI
+<span id="L51" class="LineNr"> 51 </span>  <span class="Comment"># ESI = f</span>
+<span id="L52" class="LineNr"> 52 </span>  8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="Delimiter"> . </span>          6/r32/ESI   8/disp8        <span class="Delimiter"> . </span>                <span class="Comment"># copy *(EBP+8) to ESI</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Comment"># ECX = f-&gt;read</span>
+<span id="L54" class="LineNr"> 54 </span>  8b/copy                         1/mod/*+disp8   6/rm32/ESI   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          1/r32/ECX   8/disp8        <span class="Delimiter"> . </span>                <span class="Comment"># copy *(ESI+8) to ECX</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="SalientComment">## if (f-&gt;read &lt; f-&gt;write) read byte from stream</span>
+<span id="L56" class="LineNr"> 56 </span>  3b/compare                      1/mod/*+disp8   6/rm32/ESI   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          1/r32/ECX   4/disp8        <span class="Delimiter"> . </span>                <span class="Comment"># compare ECX with *(ESI+4)</span>
+<span id="L57" class="LineNr"> 57 </span>  7c/jump-if-lesser  $read-byte:from-stream/disp8
+<span id="L58" class="LineNr"> 58 </span>  <span class="Comment"># clear-stream(stream = f+4)</span>
+<span id="L59" class="LineNr"> 59 </span>    <span class="Comment"># push args</span>
+<span id="L60" class="LineNr"> 60 </span>  8d/copy-address                 1/mod/*+disp8   6/rm32/ESI   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          0/r32/EAX   4/disp8        <span class="Delimiter"> . </span>                <span class="Comment"># copy ESI+4 to EAX</span>
+<span id="L61" class="LineNr"> 61 </span>  50/push-EAX
+<span id="L62" class="LineNr"> 62 </span>    <span class="Comment"># call</span>
+<span id="L63" class="LineNr"> 63 </span>  e8/call  clear-stream/disp32
+<span id="L64" class="LineNr"> 64 </span>    <span class="Comment"># discard args</span>
+<span id="L65" class="LineNr"> 65 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Comment"># EAX = read(f-&gt;fd, stream = f+4)</span>
+<span id="L67" class="LineNr"> 67 </span>    <span class="Comment"># push args</span>
+<span id="L68" class="LineNr"> 68 </span>  50/push-EAX
+<span id="L69" class="LineNr"> 69 </span>  ff          6/subop/push        0/mod/indirect  6/rm32/ESI   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># push *ESI</span>
+<span id="L70" class="LineNr"> 70 </span>    <span class="Comment"># call</span>
+<span id="L71" class="LineNr"> 71 </span>  e8/call  read/disp32
+<span id="L72" class="LineNr"> 72 </span>    <span class="Comment"># discard args</span>
+<span id="L73" class="LineNr"> 73 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              8/imm32           <span class="Comment"># add to ESP</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Comment"># if EAX = 0 return 0xffffffff</span>
+<span id="L75" class="LineNr"> 75 </span>  81          7/subop/compare     3/mod/direct    0/rm32/EAX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0/imm32           <span class="Comment"># compare EAX</span>
+<span id="L76" class="LineNr"> 76 </span>  75/jump-if-not-equal  $read-byte:from-stream/disp8
+<span id="L77" class="LineNr"> 77 </span>  b8/copy-to-EAX  0xffffffff/imm32
+<span id="L78" class="LineNr"> 78 </span>  eb/jump  $read-byte:end/disp8
+<span id="L79" class="LineNr"> 79 </span>$read-byte:from-stream:
+<span id="L80" class="LineNr"> 80 </span>  <span class="Comment"># AL = f-&gt;data[f-&gt;read]</span>
+<span id="L81" class="LineNr"> 81 </span>  31/xor                          3/mod/direct    0/rm32/EAX   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          0/r32/EAX  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># clear EAX</span>
+<span id="L82" class="LineNr"> 82 </span>  8a/copy-byte                    1/mod/*+disp8   4/rm32/sib    6/base/ESI  1/index/ECX  <span class="Delimiter"> . </span>          0/r32/AL    0x10/disp8     <span class="Delimiter"> . </span>                <span class="Comment"># copy *(ESI+ECX+16) to AL</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Comment"># ++f-&gt;read</span>
+<span id="L84" class="LineNr"> 84 </span>  ff          0/subop/increment   1/mod/*+disp8   6/rm32/ESI   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>          8/disp8        <span class="Delimiter"> . </span>                <span class="Comment"># increment *(ESI+8)</span>
+<span id="L85" class="LineNr"> 85 </span>$read-byte:end:
+<span id="L86" class="LineNr"> 86 </span>  <span class="Comment"># restore registers</span>
+<span id="L87" class="LineNr"> 87 </span>  5e/pop-to-ESI
+<span id="L88" class="LineNr"> 88 </span>  59/pop-to-ECX
+<span id="L89" class="LineNr"> 89 </span>  <span class="Comment"># epilog</span>
+<span id="L90" class="LineNr"> 90 </span>  89/copy                         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>          5/r32/EBP  <span class="Delimiter"> . </span>             <span class="Delimiter"> . </span>                <span class="Comment"># copy EBP to ESP</span>
+<span id="L91" class="LineNr"> 91 </span>  5d/pop-to-EBP
+<span id="L92" class="LineNr"> 92 </span>  c3/return
+<span id="L93" class="LineNr"> 93 </span>
+<span id="L94" class="LineNr"> 94 </span><span class="Comment"># todo: how should write-byte look? What should it do when the output has no</span>
+<span id="L95" class="LineNr"> 95 </span><span class="Comment"># space remaining? Maybe return an error code.</span>
+<span id="L96" class="LineNr"> 96 </span>
+<span id="L97" class="LineNr"> 97 </span><span class="SalientComment">## tests</span>
+<span id="L98" class="LineNr"> 98 </span>
+<span id="L99" class="LineNr"> 99 </span>test-read-byte-single:
+<span id="L100" class="LineNr">100 </span>  <span class="SalientComment">## check that read-byte returns first byte of 'file'</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Comment"># clear-stream(_test-stream)</span>
+<span id="L102" class="LineNr">102 </span>    <span class="Comment"># push args</span>
+<span id="L103" class="LineNr">103 </span>  68/push  _test-stream/imm32
+<span id="L104" class="LineNr">104 </span>    <span class="Comment"># call</span>
+<span id="L105" class="LineNr">105 </span>  e8/call  clear-stream/disp32
+<span id="L106" class="LineNr">106 </span>    <span class="Comment"># discard args</span>
+<span id="L107" class="LineNr">107 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Comment"># clear-stream(_test-buffered-file+4)</span>
+<span id="L109" class="LineNr">109 </span>    <span class="Comment"># push args</span>
+<span id="L110" class="LineNr">110 </span>  b8/copy-to-EAX  _test-buffered-file/imm32
+<span id="L111" class="LineNr">111 </span>  05/add-to-EAX  4/imm32
+<span id="L112" class="LineNr">112 </span>  50/push-EAX
+<span id="L113" class="LineNr">113 </span>    <span class="Comment"># call</span>
+<span id="L114" class="LineNr">114 </span>  e8/call  clear-stream/disp32
+<span id="L115" class="LineNr">115 </span>    <span class="Comment"># discard args</span>
+<span id="L116" class="LineNr">116 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Comment"># write(_test-stream, &quot;Ab&quot;)</span>
+<span id="L118" class="LineNr">118 </span>    <span class="Comment"># push args</span>
+<span id="L119" class="LineNr">119 </span>  68/push  <span class="Constant">&quot;Ab&quot;</span>/imm32
+<span id="L120" class="LineNr">120 </span>  68/push  _test-stream/imm32
+<span id="L121" class="LineNr">121 </span>    <span class="Comment"># call</span>
+<span id="L122" class="LineNr">122 </span>  e8/call  write/disp32
+<span id="L123" class="LineNr">123 </span>    <span class="Comment"># discard args</span>
+<span id="L124" class="LineNr">124 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              8/imm32           <span class="Comment"># add to ESP</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Comment"># read-byte(_test-buffered-file)</span>
+<span id="L126" class="LineNr">126 </span>    <span class="Comment"># push args</span>
+<span id="L127" class="LineNr">127 </span>  68/push  _test-buffered-file/imm32
+<span id="L128" class="LineNr">128 </span>    <span class="Comment"># call</span>
+<span id="L129" class="LineNr">129 </span>  e8/call  read-byte/disp32
+<span id="L130" class="LineNr">130 </span>    <span class="Comment"># discard args</span>
+<span id="L131" class="LineNr">131 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Comment"># check-ints-equal(EAX, 'A')</span>
+<span id="L133" class="LineNr">133 </span>    <span class="Comment"># push args</span>
+<span id="L134" class="LineNr">134 </span>  68/push  <span class="Constant">&quot;F - test-read-byte-single&quot;</span>/imm32
+<span id="L135" class="LineNr">135 </span>  68/push  0x41/imm32
+<span id="L136" class="LineNr">136 </span>  50/push-EAX
+<span id="L137" class="LineNr">137 </span>    <span class="Comment"># call</span>
+<span id="L138" class="LineNr">138 </span>  e8/call  check-ints-equal/disp32
+<span id="L139" class="LineNr">139 </span>    <span class="Comment"># discard args</span>
+<span id="L140" class="LineNr">140 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0xc/imm32         <span class="Comment"># add to ESP</span>
+<span id="L141" class="LineNr">141 </span>  <span class="Comment"># end</span>
+<span id="L142" class="LineNr">142 </span>  c3/return
+<span id="L143" class="LineNr">143 </span>
+<span id="L144" class="LineNr">144 </span>test-read-byte-multiple:
+<span id="L145" class="LineNr">145 </span>  <span class="SalientComment">## call read-byte twice, check that second call returns second byte</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Comment"># clear-stream(_test-stream)</span>
+<span id="L147" class="LineNr">147 </span>    <span class="Comment"># push args</span>
+<span id="L148" class="LineNr">148 </span>  68/push  _test-stream/imm32
+<span id="L149" class="LineNr">149 </span>    <span class="Comment"># call</span>
+<span id="L150" class="LineNr">150 </span>  e8/call  clear-stream/disp32
+<span id="L151" class="LineNr">151 </span>    <span class="Comment"># discard args</span>
+<span id="L152" class="LineNr">152 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Comment"># clear-stream(_test-buffered-file+4)</span>
+<span id="L154" class="LineNr">154 </span>    <span class="Comment"># push args</span>
+<span id="L155" class="LineNr">155 </span>  b8/copy-to-EAX  _test-buffered-file/imm32
+<span id="L156" class="LineNr">156 </span>  05/add-to-EAX  4/imm32
+<span id="L157" class="LineNr">157 </span>  50/push-EAX
+<span id="L158" class="LineNr">158 </span>    <span class="Comment"># call</span>
+<span id="L159" class="LineNr">159 </span>  e8/call  clear-stream/disp32
+<span id="L160" class="LineNr">160 </span>    <span class="Comment"># discard args</span>
+<span id="L161" class="LineNr">161 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Comment"># write(_test-stream, &quot;Ab&quot;)</span>
+<span id="L163" class="LineNr">163 </span>    <span class="Comment"># push args</span>
+<span id="L164" class="LineNr">164 </span>  68/push  <span class="Constant">&quot;Ab&quot;</span>/imm32
+<span id="L165" class="LineNr">165 </span>  68/push  _test-stream/imm32
+<span id="L166" class="LineNr">166 </span>    <span class="Comment"># call</span>
+<span id="L167" class="LineNr">167 </span>  e8/call  write/disp32
+<span id="L168" class="LineNr">168 </span>    <span class="Comment"># discard args</span>
+<span id="L169" class="LineNr">169 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              8/imm32           <span class="Comment"># add to ESP</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Comment"># read-byte(_test-buffered-file)</span>
+<span id="L171" class="LineNr">171 </span>    <span class="Comment"># push args</span>
+<span id="L172" class="LineNr">172 </span>  68/push  _test-buffered-file/imm32
+<span id="L173" class="LineNr">173 </span>    <span class="Comment"># call</span>
+<span id="L174" class="LineNr">174 </span>  e8/call  read-byte/disp32
+<span id="L175" class="LineNr">175 </span>    <span class="Comment"># discard args</span>
+<span id="L176" class="LineNr">176 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Comment"># read-byte(_test-buffered-file)</span>
+<span id="L178" class="LineNr">178 </span>    <span class="Comment"># push args</span>
+<span id="L179" class="LineNr">179 </span>  68/push  _test-buffered-file/imm32
+<span id="L180" class="LineNr">180 </span>    <span class="Comment"># call</span>
+<span id="L181" class="LineNr">181 </span>  e8/call  read-byte/disp32
+<span id="L182" class="LineNr">182 </span>    <span class="Comment"># discard args</span>
+<span id="L183" class="LineNr">183 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Comment"># check-ints-equal(EAX, 'b')</span>
+<span id="L185" class="LineNr">185 </span>    <span class="Comment"># push args</span>
+<span id="L186" class="LineNr">186 </span>  68/push  <span class="Constant">&quot;F - test-read-byte-multiple&quot;</span>/imm32
+<span id="L187" class="LineNr">187 </span>  68/push  0x62/imm32
+<span id="L188" class="LineNr">188 </span>  50/push-EAX
+<span id="L189" class="LineNr">189 </span>    <span class="Comment"># call</span>
+<span id="L190" class="LineNr">190 </span>  e8/call  check-ints-equal/disp32
+<span id="L191" class="LineNr">191 </span>    <span class="Comment"># discard args</span>
+<span id="L192" class="LineNr">192 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0xc/imm32         <span class="Comment"># add to ESP</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Comment"># end</span>
+<span id="L194" class="LineNr">194 </span>  c3/return
+<span id="L195" class="LineNr">195 </span>
+<span id="L196" class="LineNr">196 </span>test-read-byte-end-of-file:
+<span id="L197" class="LineNr">197 </span>  <span class="SalientComment">## call read-byte on an empty 'file', check that it returns -1</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Comment"># clear-stream(_test-stream)</span>
+<span id="L199" class="LineNr">199 </span>    <span class="Comment"># push args</span>
+<span id="L200" class="LineNr">200 </span>  68/push  _test-stream/imm32
+<span id="L201" class="LineNr">201 </span>    <span class="Comment"># call</span>
+<span id="L202" class="LineNr">202 </span>  e8/call  clear-stream/disp32
+<span id="L203" class="LineNr">203 </span>    <span class="Comment"># discard args</span>
+<span id="L204" class="LineNr">204 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Comment"># clear-stream(_test-buffered-file+4)</span>
+<span id="L206" class="LineNr">206 </span>    <span class="Comment"># push args</span>
+<span id="L207" class="LineNr">207 </span>  b8/copy-to-EAX  _test-buffered-file/imm32
+<span id="L208" class="LineNr">208 </span>  05/add-to-EAX  4/imm32
+<span id="L209" class="LineNr">209 </span>  50/push-EAX
+<span id="L210" class="LineNr">210 </span>    <span class="Comment"># call</span>
+<span id="L211" class="LineNr">211 </span>  e8/call  clear-stream/disp32
+<span id="L212" class="LineNr">212 </span>    <span class="Comment"># discard args</span>
+<span id="L213" class="LineNr">213 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Comment"># read-byte(_test-buffered-file)</span>
+<span id="L215" class="LineNr">215 </span>    <span class="Comment"># push args</span>
+<span id="L216" class="LineNr">216 </span>  68/push  _test-buffered-file/imm32
+<span id="L217" class="LineNr">217 </span>    <span class="Comment"># call</span>
+<span id="L218" class="LineNr">218 </span>  e8/call  read-byte/disp32
+<span id="L219" class="LineNr">219 </span>    <span class="Comment"># discard args</span>
+<span id="L220" class="LineNr">220 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              4/imm32           <span class="Comment"># add to ESP</span>
+<span id="L221" class="LineNr">221 </span>  <span class="Comment"># check-ints-equal(EAX, -1)</span>
+<span id="L222" class="LineNr">222 </span>    <span class="Comment"># push args</span>
+<span id="L223" class="LineNr">223 </span>  68/push  <span class="Constant">&quot;F - test-read-byte-end-of-file&quot;</span>/imm32
+<span id="L224" class="LineNr">224 </span>  68/push  -1/imm32
+<span id="L225" class="LineNr">225 </span>  50/push-EAX
+<span id="L226" class="LineNr">226 </span>    <span class="Comment"># call</span>
+<span id="L227" class="LineNr">227 </span>  e8/call  check-ints-equal/disp32
+<span id="L228" class="LineNr">228 </span>    <span class="Comment"># discard args</span>
+<span id="L229" class="LineNr">229 </span>  81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>           <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>         <span class="Delimiter"> . </span>              0xc/imm32         <span class="Comment"># add to ESP</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Comment"># end</span>
+<span id="L231" class="LineNr">231 </span>  c3/return
+<span id="L232" class="LineNr">232 </span>
+<span id="L233" class="LineNr">233 </span>== data
+<span id="L234" class="LineNr">234 </span>
+<span id="L235" class="LineNr">235 </span>_test-buffered-file:
+<span id="L236" class="LineNr">236 </span>  <span class="Comment"># file descriptor or (address stream)</span>
+<span id="L237" class="LineNr">237 </span>  _test-stream/imm32
+<span id="L238" class="LineNr">238 </span>  <span class="Comment"># current write index</span>
+<span id="L239" class="LineNr">239 </span>  00 00 00 00
+<span id="L240" class="LineNr">240 </span>  <span class="Comment"># current read index</span>
+<span id="L241" class="LineNr">241 </span>  00 00 00 00
+<span id="L242" class="LineNr">242 </span>  <span class="Comment"># length (8)</span>
+<span id="L243" class="LineNr">243 </span>  08 00 00 00
+<span id="L244" class="LineNr">244 </span>  <span class="Comment"># data</span>
+<span id="L245" class="LineNr">245 </span>  00 00 00 00 00 00 00 00  <span class="Comment"># 8 bytes</span>
+<span id="L246" class="LineNr">246 </span>
+<span id="L247" class="LineNr">247 </span><span class="Comment"># vim&#0058;nowrap:textwidth=0</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->