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to dst. If there aren't that many characters, a NUL character will
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be added to the end of dst to terminate it properly. This gives the
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same effect as calling strxcpy(buff, src1, ..., srcn, NullS) with a
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large enough buffer, and then calling strnmov(dst, buff, len).
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large enough buffer, and then calling stpncpy(dst, buff, len).
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Beware: the last argument should be the null character pointer.
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Take VERY great care not to omit it! Also be careful to use NullS
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and NOT to use 0, as on some machines 0 is not the same size as a
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character pointer, or not the same bit pattern as NullS.
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characters; dst will be padded on the right with NUL characters as
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needed. strxncpy does the same. strxncat, like strncat, does NOT.