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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1392#note_516789411">lib/x509/ocsp.c</a>:
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<pre style="margin: 0;"> <span id="LC2457" class="line" lang="c"> <span class="k" style="font-weight: 600;">goto</span> <span class="n" style="color: #333;">fail</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC2458" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2459" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC2461" class="line" lang="c"> <span class="n" style="color: #333;">new_ocsps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gnutls_realloc</span><span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">ocsps</span><span class="p">,</span> <span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span><span class="o" style="font-weight: 600;">*</span><span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">gnutls_ocsp_resp_t</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC2460" class="line" lang="c"> <span class="n" style="color: #333;">new_ocsps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_reallocarray</span><span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">ocsps</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC2461" class="line" lang="c"> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">,</span></span>
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<p dir="auto">I suppose there is a trade-off (i.e. alloc cost vs the frequency of the function call), but this specific case is about realloc, which should already have an <a href="https://sourceware.org/glibc/wiki/MallocInternals#Realloc_Algorithm" rel="nofollow noreferrer noopener" target="_blank">optimization</a> underneath to avoid frequent malloc-copy-free.</p>
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