Marcel Moolenaar eef9f6d258 The getlogin_basic() function can return a 0 status with a NULL
pointer for the login name (result). Make sure to handle that
case properly. Improve robustness by checking namelen and then
nul-terminating the provided buffer to simplify subsequent logic.

Obtained from:	Juniper Networks, Inc.
MFC after:	1 week
2014-04-05 18:14:58 +00:00
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