tree 1129d62c5b93cf1195be6270b1904d8885264d33
parent 4d36b0bd38559ae0376b61a0ac2f5fa8329ec56d
author Elliott Hughes <enh@google.com> 1351546030 -0700
committer Elliott Hughes <enh@google.com> 1351546030 -0700

Clean up the <libgen.h> implementation a little, bring in tests.

Most of these tests were in system/extras, but I've added more to cover other
cases explicitly mentioned by POSIX.

Change-Id: I5e8d77e4179028d77306935cceadbb505515dcde