[Bug 14726] Blank password in /etc/passwd results in no username displayed in a prompt

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=14726

--- Comment #1 from Oliver Endriss <o.endriss at gmx.de> ---
Note that all functions which get the user name from /etc/passwd are affected:
ls -l, ps, whoami, etc.

The bug was introduced by commit c9fc15359ef8fe5aa98ab0308c1563d9bcf99bb8

With this commit, nth_string() does not longer work with an empty field in the
middle of the line, for example an empty password field in /etc/password.

Please revert this commit!

Regards,
Oliver

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