wcsncpy - copy a fixed-size string of wide characters
wchar_t *wcsncpy(wchar_t *dest, const wchar_t *src, size_t n);
The wcsncpy() function is the wide-character equivalent of the
strncpy(3) function. It copies at most n wide characters from
the wide-character string pointed to by src, including the terminating
null wide character (L'\0'), to the array pointed to by dest. Exactly
n wide characters are written at dest. If the length
wcslen(src) is smaller than n, the remaining wide characters in
the array pointed to by dest are filled with null wide characters. If
the length wcslen(src) is greater than or equal to n, the string
pointed to by dest will not be terminated by a null wide character.
The strings may not overlap.
The programmer must ensure that there is room for at least
n 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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