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<a href="https://gitlab.com/simo5">Simo Sorce</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/1052#note_201640333">lib/iov.h</a>:
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="c"> <span class="n" style="color: #333;">iter</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">iov_index</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="c"> <span class="n" style="color: #333;">iter</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">iov_offset</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="c"> <span class="n" style="color: #333;">iter</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">block_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">block_size</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="c"> <span class="n" style="color: #333;">iter</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">block_offset</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Retrieve the current block(s) pointed by @iter and advance it to</span></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * the next buffer. */</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kr" style="font-weight: 600;">inline</span> <span class="kt" style="color: #458; font-weight: 600;">int</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">iov_iter_next</span><span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">iov_iter_st</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">iter</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="o" style="font-weight: 600;">**</span><span class="n" style="color: #333;">data</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">blocks</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="c"> <span class="k" style="font-weight: 600;">while</span> <span class="p">(</span><span class="n" style="color: #333;">iter</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">iov_index</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">iter</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">iov_count</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">giovec_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">iov</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">iter</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="n" style="color: #333;">iter</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">iov_index</span><span class="p">];</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">iov</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">iov_base</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">ssize_t</span> <span class="n" style="color: #333;">len</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">iov</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">iov_len</span><span class="p">;</span></span>
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<p dir="auto">It's dangerous to cast len though, because if it becomes negative via DECR_LEN macro then your cast will compare as greater instead of smaller. Why the cast ?</p>
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