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<a href="https://gitlab.com/rockdaboot">Tim Rühsen</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/libtasn1/merge_requests/29#note_194863727">lib/structure.c</a>:
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">definitions</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">definitions</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span><span class="p">;</span></span>
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208
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">move</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">DOWN</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="208" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">move</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">DOWN</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num new new_line" data-linenumber="209" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
209
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">p_last</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">p_last</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">down</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="c"> <span class="n" style="color: #333;">_asn1_delete_node_from_list</span> <span class="p">(</span><span class="n" style="color: #333;">e_list</span><span class="p">,</span> <span class="n" style="color: #333;">p_last</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">down</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="211" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="c"> <span class="n" style="color: #333;">_asn1_remove_node</span> <span class="p">(</span><span class="n" style="color: #333;">p_last</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">down</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="c"> <span class="n" style="color: #333;">_asn1_set_down</span> <span class="p">(</span><span class="n" style="color: #333;">p_last</span><span class="p">,</span> <span class="n" style="color: #333;">p</span><span class="p">);</span></span>
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211
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">move</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">RIGHT</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">move</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">RIGHT</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">p_last</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">p_last</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">right</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="c"> <span class="n" style="color: #333;">_asn1_delete_node_from_list</span> <span class="p">(</span><span class="n" style="color: #333;">e_list</span><span class="p">,</span> <span class="n" style="color: #333;">p_last</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">right</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="c"> <span class="n" style="color: #333;">_asn1_remove_node</span> <span class="p">(</span><span class="n" style="color: #333;">p_last</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">down</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<p dir="auto">Looks like <code>container_of</code> needs global memory to store the information. Which then includes mutexes / pthread library and so on...</p>
<p dir="auto">Interestingly, <code>asn1_array2tree()</code> has something similar for the error case. All allocated nodes are stored in a list (<code>list_type *e_list</code>). On error, a simple <code>_asn1_delete_list_and_nodes()</code> is called to free all memory (instead of traversing the tree via <code>asn1_delete_structure()</code>).</p>
<p dir="auto">We could carry that list (or an array / vector) around and use that in <code>asn1_delete_structure()</code>. It needs a new API but very similar to <code>asn1_array2tree()</code>.</p>
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