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wchar_t *wcsncat(wchar_t *dest, const wchar_t *src, size_t n);
The wcsncat() function is the wide-character equivalent of the strn-
cat(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
The strings may not overlap.
The programmer must ensure that there is room for at least
wcslen(dest)+n+1 wide characters at dest.
wcsncat() returns dest.
Multithreading (see pthreads(7))
The wcsncat() function is thread-safe.
GNU 2013-11-25 WCSNCAT(3)