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)

Close buffer overflow noted in security advisory DSA-085.
Submitted by: Koga Youichirou <y-koga@jp.FreeBSD.org>
Obtained from: Debian

It is just stupid to have to do ``<ESC>!rm -f %'' to write a file you own.
So lets stop that nonsense and allow `w!' to do something useful.

Submitted by: green

10 X's in mkstemp().

Set the close-on-exec flag when we lock the file we're editing.
This prevents any background sub-command executed from inheriting
the descriptor & lock (and making vi think that someone else is
editing the file when it re-edits).

Remembered from: An OpenBSD commit message from May '99

This commit was generated by cvs2svn to compensate for changes in r19304,
which included commits to RCS files with non-trunk default branches.

Import of nvi-1.79, minus a few bits that we dont need (eg: postscript
files, curses, db, regex etc that we already have). The other glue will
follow shortly.

Obtained from: Keith Bostic <bostic@bostic.com>