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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 char-
acters at dest.
wcsncpy() returns dest.
Multithreading (see pthreads(7))
The wcsncpy() function is thread-safe.
GNU 2013-11-25 WCSNCPY(3)