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<a href='https://github.com/akkartik/mu/blob/main/linux/312copy.subx'>https://github.com/akkartik/mu/blob/main/linux/312copy.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span>== code
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="subxFunction">copy-array-object</span>: <span class="subxComment"># src: (addr array T), dest-ah: (addr handle array T)</span>
<span id="L4" class="LineNr"> 4 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L5" class="LineNr"> 5 </span> 55/push-ebp
<span id="L6" class="LineNr"> 6 </span> 89/<- %ebp 4/r32/esp
<span id="L7" class="LineNr"> 7 </span> <span class="subxComment">#</span>
<span id="L8" class="LineNr"> 8 </span> (<a href='120allocate.subx.html#L720'>copy-array</a> <span class="SpecialChar"><a href='120allocate.subx.html#L27'>Heap</a></span> *(ebp+8) *(ebp+0xc))
<span id="L9" class="LineNr"> 9 </span><span class="Constant">$copy-array-object:end</span>:
<span id="L10" class="LineNr">10 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L11" class="LineNr">11 </span> 89/<- %esp 5/r32/ebp
<span id="L12" class="LineNr">12 </span> 5d/pop-to-ebp
<span id="L13" class="LineNr">13 </span> c3/return
<span id="L14" class="LineNr">14 </span>
<span id="L15" class="LineNr">15 </span><span class="subxComment"># create an independent copy of file src into dest</span>
<span id="L16" class="LineNr">16 </span><span class="subxComment"># there's no way to do this without knowing the filename</span>
<span id="L17" class="LineNr">17 </span><span class="subxFunction">copy-file</span>: <span class="subxComment"># src: (addr buffered-file), dest-ah: (addr handle buffered-file), filename: (addr array byte)</span>
<span id="L18" class="LineNr">18 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L19" class="LineNr">19 </span> 55/push-ebp
<span id="L20" class="LineNr">20 </span> 89/<- %ebp 4/r32/esp
<span id="L21" class="LineNr">21 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L22" class="LineNr">22 </span> 50/push-eax
<span id="L23" class="LineNr">23 </span> 51/push-ecx
<span id="L24" class="LineNr">24 </span> 52/push-edx
<span id="L25" class="LineNr">25 </span> 53/push-ebx
<span id="L26" class="LineNr">26 </span> 56/push-esi
<span id="L27" class="LineNr">27 </span> 57/push-edi
<span id="L28" class="LineNr">28 </span> <span class="subxComment"># esi = src</span>
<span id="L29" class="LineNr">29 </span> 8b/-> *(ebp+8) 6/r32/esi
<span id="L30" class="LineNr">30 </span> <span class="subxComment"># var n/ecx: int = src->buffer->size + 16</span>
<span id="L31" class="LineNr">31 </span> 8b/-> *(esi+0xc) 0/r32/eax
<span id="L32" class="LineNr">32 </span> 05/add-to-eax 0x10/imm32 <span class="subxComment"># buffered-file fields before buffer contents</span>
<span id="L33" class="LineNr">33 </span> 89/<- %ecx 0/r32/eax
<span id="L34" class="LineNr">34 </span> <span class="subxComment">#</span>
<span id="L35" class="LineNr">35 </span> (<a href='120allocate.subx.html#L66'>allocate</a> <span class="SpecialChar"><a href='120allocate.subx.html#L27'>Heap</a></span> %ecx *(ebp+0xc))
<span id="L36" class="LineNr">36 </span> <span class="subxComment"># var dest/edi: (addr buffered-file) = lookup(*dest-ah)</span>
<span id="L37" class="LineNr">37 </span> 8b/-> *(ebp+0xc) 0/r32/eax
<span id="L38" class="LineNr">38 </span> (<a href='120allocate.subx.html#L258'>lookup</a> *eax *(eax+4)) <span class="subxComment"># => eax</span>
<span id="L39" class="LineNr">39 </span> 89/<- %edi 0/r32/eax
<span id="L40" class="LineNr">40 </span> <span class="subxComment">#</span>
<span id="L41" class="LineNr">41 </span> (<a href='310copy-bytes.subx.html#L6'>copy-bytes</a> %esi %edi %ecx)
<span id="L42" class="LineNr">42 </span> <span class="subxComment"># var offset/ecx: int = lseek(src->fd, 0, SEEK_CUR)</span>
<span id="L43" class="LineNr">43 </span> 8b/-> *esi 3/r32/ebx
<span id="L44" class="LineNr">44 </span> b9/copy-to-ecx 0/imm32/offset
<span id="L45" class="LineNr">45 </span> ba/copy-to-edx 1/imm32/whence:SEEK_CUR
<span id="L46" class="LineNr">46 </span> (<a href='000init.subx.html#L47'>syscall_lseek</a>)
<span id="L47" class="LineNr">47 </span> 89/<- %ecx 0/r32/eax
<span id="L48" class="LineNr">48 </span> <span class="subxComment"># at this point dest is identical to src, including file descriptor. Now</span>
<span id="L49" class="LineNr">49 </span> <span class="subxComment"># create an independent copy of the file descriptor</span>
<span id="L50" class="LineNr">50 </span> (<a href='306files.subx.html#L40'>open-fd</a> *(ebp+0x10) 0) <span class="subxComment"># false => eax</span>
<span id="L51" class="LineNr">51 </span> 89/<- *edi 0/r32/eax
<span id="L52" class="LineNr">52 </span> <span class="subxComment"># replicate offset in the new fd</span>
<span id="L53" class="LineNr">53 </span> 89/<- %ebx 0/r32/eax <span class="subxComment"># fd</span>
<span id="L54" class="LineNr">54 </span> 51/push-ecx <span class="subxComment"># offset</span>
<span id="L55" class="LineNr">55 </span> ba/copy-to-edx 0/imm32/whence:SEEK_SET
<span id="L56" class="LineNr">56 </span> (<a href='000init.subx.html#L47'>syscall_lseek</a>)
<span id="L57" class="LineNr">57 </span><span class="Constant">$copy-file:end</span>:
<span id="L58" class="LineNr">58 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L59" class="LineNr">59 </span> 5f/pop-to-edi
<span id="L60" class="LineNr">60 </span> 5e/pop-to-esi
<span id="L61" class="LineNr">61 </span> 5b/pop-to-ebx
<span id="L62" class="LineNr">62 </span> 5a/pop-to-edx
<span id="L63" class="LineNr">63 </span> 59/pop-to-ecx
<span id="L64" class="LineNr">64 </span> 58/pop-to-eax
<span id="L65" class="LineNr">65 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L66" class="LineNr">66 </span> 89/<- %esp 5/r32/ebp
<span id="L67" class="LineNr">67 </span> 5d/pop-to-ebp
<span id="L68" class="LineNr">68 </span> c3/return
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