wcsncpy - copy a fixed-size string of wide characters
The wcsncpy() function is the wide-character
equivalent of the strncpy(3) function. It copies at
n wide characters from the wide-character string pointed
src, including the terminating null wide character
(L'\0'), to the array pointed to by
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
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
wide characters at
POSIX.1-2001, POSIX.1-2008, C99.
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