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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/1056#note_215623057">lib/gnutls_int.h</a>:
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define MEMSUB(x,y) ((ssize_t)((ptrdiff_t)x-(ptrdiff_t)y))</span></span>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define DECR_LEN(len, x) do { <span class="idiff left right">len-=x; if (len<0) {gnutls_assert(); return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;}</span> } while (0)</span></span>
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define DECR_LEN(len, x) do { <span class="idiff left right">if (len<x) {gnutls_assert(); return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;} else len-=x;</span> } while (0)</span></span>
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<p dir="auto">I was thinking that as these macros become more complex, it would be easy to introduce a change in one of them and miss updating the other.</p>
<p dir="auto">To address that, what do you think of wrapping the macros over each other? Eg:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true" style="background-color: #fff; font-family: monospace; font-size: 90%; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0;"><code><span id="LC1" class="line" lang="plaintext">#define DECR_LEN(len, x) DECR_LENGTH_RET(len, x, GNUTLS_E_UNEXPECTED_PACKET_LENGTH)</span>
<span id="LC2" class="line" lang="plaintext">#define DECR_LEN_RET(len, x, rval) DECR_LENGTH_COM(len, x, return rval)</span></code></pre>
<p dir="auto">That is to have a single place to update/fix.</p>
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