std::wcsncat (3) - Linux Man Pages
Defined in header <cwchar>
wchar_t *wcsncat( wchar_t *dest, const wchar_t *src, std::size_t count );
Appends at most count wide characters from the wide string pointed to by src to the end of the character string pointed to by dest, stopping if the null terminator is copied. The wide character src replaces the null terminator at the end of dest. The null terminator is always appended in the end (so the maximum number of wide characters the function may write is count+1).
The behavior is undefined if the destination array is not large enough for the contents of both str and dest and the terminating null wide character.
The behavior is undefined if the strings overlap.
dest - pointer to the null-terminated wide string to append to
src - pointer to the null-terminated wide string to copy from
count - maximum number of wide characters to copy
// Run this code