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5.17 stpncpy—counted copy string returning a pointer to its end

Synopsis 

     #include <string.h>
     char *stpncpy(char *restrict dst, const char *restrict src,
         size_t length);

Description
stpncpy copies not more than length characters from the the string pointed to by src (including the terminating null character) to the array pointed to by dst. If the string pointed to by src is shorter than length characters, null characters are appended to the destination array until a total of length characters have been written.
Returns
This function returns a pointer to the end of the destination string, thus pointing to the trailing '\0', or, if the destination string is not null-terminated, pointing to dst + n.
Portability
stpncpy is a GNU extension, candidate for inclusion into POSIX/SUSv4.

stpncpy requires no supporting OS subroutines.