Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

The NetBSD Foundation has granted permission to remove clause 3 and 4
from their software.

Obtained from: NetBSD

Use getline() instead of fgets(). This enables nl(1) to handle
arbitrarily long lines and embedded NULs. The new functionality is
nugatory, but adding it is a simple way to improve the exposure of
getline() in -CURRENT.

Avoid 'bogus' uninitialized warning by initializing rather than
playing cute games. It is much simpler, clearer and easier to follow
and understand. Besides, gcc4 likes it better.

Remove unused variables.

Add support for multibyte characters.

Tidy up usage message.

Remove local prototypes for main().

The XCU issue 5 requirement of accepting the file operand intermingled
with options has been withdrawn in issue 6, to which nl(1) now conforms.

style(9): use errx() where appropriate instead of fprintf() + exit().

style(9): use err() instead of perror() + exit().

remove __P

Removed duplicate VCS ID tags, as per style(9).

Add nl(1)

PR: 27078
Obtained from: NetBSD