SAFECOPY (now using strlcpy) requires the source is terminated

... so use strncpy() and TERMINATE() here (instead of SAFECOPY) to resolve
newly reported Coverity issues.

There may be other places where we're using SAFECOPY() with an unterminated
source string that would've been fine before we switched SAFECOPY from using
strncpy to strlcpy. So we should reconsider that change.