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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/1151#note_276111418">lib/hello_ext.c</a>:
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="c"> <span class="n" style="color: #333;">hello_ext_ctx_st</span> <span class="n" style="color: #333;">ctx</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC298" class="line" lang="c"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">&=</span> <span class="n" style="color: #333;">GNUTLS_EXT_FLAG_SET_ONLY_FLAGS_MASK</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="c"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">&=</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">gnutls_ext_flags_t</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">GNUTLS_EXT_FLAG_SET_ONLY_FLAGS_MASK</span><span class="p">;</span></span>
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<p dir="auto"><code>gnutls_ext_flags_t</code> is to help identifying individual values. As we go to masks it doesn't make much sense, because there is is no guarrantee they value will contain only the enumerated values (it can be an OR of them), and thus it can be confusing as one could expect an actual enumerated value, however on the debugger you'll see something unrelated. As such, in my opinion, it makes more sense to make it unsigned to remove ambiguities.</p>
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