Fix several buffer termination bugs

Fix several buffer termination bugs

* strcpy() replaced in several places with strncpy() to ensure destination
  buffers are not overflowed.

* strncpy() does not nul-terminate the destination when the string being
  copied in exactly fills the buffer. Ensure we have terminated strings
  where it may matter.

 Detected by Coverity Scan. Issues 740309, 740310, 740311, 740481, 740483