title: Wide-character version of _memccpy
body: <p>I have to concatenate wide C-style strings, and based on my research, it seems that something like <a href="https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/memccpy?view=vs-2019" rel="nofollow noreferrer"><code>_memccpy</code></a> is <a href="https://developers.redhat.com/blog/2019/08/12/efficient-string-copying-and-concatenation-in-c/" rel="nofollow noreferrer">most ideal</a> (in order to avoid <a href="https://www.joelonsoftware.com/2001/12/11/back-to-basics/" rel="nofollow noreferrer">Shlemiel's problem</a>). But I can't seem to find a wide-character version.  Does something like that exist?</p>