wcsncat - concatenate two wide-character strings
wchar_t *wcsncat(wchar_t *dest, const wchar_t *src, size_t n);
The wcsncat() function is the wide-character equivalent of the
strncat(3) function. It copies at most n wide characters from
the wide-character string pointed to by src to the end of the
wide-character string pointed to by dest, and adds a terminating null
wide character (L'\0').
The strings may not overlap.
The programmer must ensure that there is room for at least
wcslen(dest)+n+1 wide characters at dest.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.
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