MFC r197804 (rwatson):

MFC r197804 (rwatson):
  Add basename_r(3) to complement basename(3).  basename_r(3) which accepts
  a caller-allocated buffer of at least MAXPATHLEN, rather than using a
  global buffer.

Note about semantics: while this interface is not POSIXy, there's
another major platform that uses it (Android) and the semantics between
the two platforms are pretty much the same.

git-svn-id: svn://svn.freebsd.org/base/stable/8@213002 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f