<s>
nvi	B-Device
(	O
new	B-Device
vi	I-Device
)	O
is	O
a	O
re-implementation	O
of	O
the	O
classic	O
Berkeley	O
text	B-Application
editor	I-Application
,	O
ex/vi	B-Application
,	O
traditionally	O
distributed	O
with	O
BSD	B-Operating_System
and	O
,	O
later	O
,	O
Unix	B-Application
systems	I-Application
.	O
</s>
<s>
It	O
was	O
originally	O
distributed	O
as	O
part	O
of	O
the	O
Fourth	O
Berkeley	B-Operating_System
Software	I-Operating_System
Distribution	I-Operating_System
(	O
4BSD	O
)	O
.	O
</s>
<s>
Due	O
to	O
licensing	B-Operating_System
disputes	I-Operating_System
between	O
AT&T	O
and	O
the	O
Computer	B-Operating_System
Systems	I-Operating_System
Research	I-Operating_System
Group	I-Operating_System
(	O
CSRG	B-Operating_System
)	O
at	O
the	O
University	O
of	O
California	O
,	O
Berkeley	O
,	O
the	O
CSRG	B-Operating_System
was	O
required	O
to	O
replace	O
all	O
Unix-derived	O
portions	O
of	O
BSD	B-Operating_System
source	O
with	O
new	O
and	O
unencumbered	O
code	O
.	O
</s>
<s>
nvi	B-Device
was	O
one	O
of	O
many	O
components	O
rewritten	O
,	O
despite	O
the	O
fact	O
that	O
the	O
original	O
vi	B-Application
was	O
from	O
UC	O
Berkeley	O
.	O
</s>
<s>
nvi	B-Device
was	O
written	O
by	O
Keith	O
Bostic	O
.	O
</s>
<s>
It	O
is	O
the	O
default	O
vi	B-Application
on	O
all	O
major	O
BSD	B-Operating_System
systems	O
(	O
NetBSD	B-Device
,	O
OpenBSD	B-Operating_System
,	O
and	O
FreeBSD	B-Operating_System
)	O
as	O
well	O
as	O
MINIX	B-Operating_System
.	O
</s>
<s>
It	O
was	O
originally	O
derived	O
from	O
the	O
first	O
incarnation	O
of	O
elvis	B-Device
,	O
written	O
by	O
Steve	O
Kirkendall	O
,	O
as	O
noted	O
in	O
the	O
README	O
file	O
included	O
in	O
nvi	B-Device
's	O
sources	O
.	O
</s>
<s>
He	O
also	O
has	O
been	O
developing	O
a	O
GTK+	B-Application
front	O
end	O
for	O
nvi	B-Device
,	O
but	O
this	O
effort	O
seems	O
to	O
have	O
stalled	O
.	O
</s>
<s>
The	O
aspects	O
of	O
nvi	B-Device
that	O
are	O
still	O
marked	O
preliminary	O
or	O
unimplemented	O
are	O
,	O
for	O
the	O
time	O
being	O
,	O
likely	O
to	O
remain	O
that	O
way	O
.	O
</s>
<s>
BSD	B-Operating_System
projects	O
continue	O
to	O
use	O
nvi	B-Device
version	O
1.79	O
due	O
to	O
licensing	O
differences	O
between	O
Berkeley	B-Language
Database	I-Language
1.85	O
and	O
the	O
later	O
versions	O
by	O
Sleepycat	O
Software	O
.	O
</s>
<s>
nvi	B-Device
is	O
unusual	O
because	O
it	O
uses	O
a	O
database	O
to	O
store	O
the	O
text	O
as	O
it	O
is	O
being	O
edited	O
.	O
</s>
<s>
Sven	O
Verdoolaege	O
's	O
changes	O
after	O
version	O
1.79	O
use	O
locking	O
features	O
not	O
available	O
in	O
the	O
Berkeley	B-Language
DB	I-Language
1.85	O
database	O
.	O
</s>
<s>
Reportedly	O
,	O
changes	O
to	O
nvi	B-Device
after	O
1.79	O
make	O
it	O
less	O
vi-compatible	O
.	O
</s>
<s>
nvi	B-Device
can	O
vary	O
subtly	O
across	O
the	O
BSDs	B-Operating_System
.	O
</s>
<s>
nvi	B-Device
is	O
only	O
available	O
on	O
POSIX/Unix	O
platforms	O
due	O
to	O
its	O
reliance	O
on	O
the	O
curses/ncurses	O
library	O
.	O
</s>
<s>
An	O
unmaintained	O
,	O
multilingual	O
version	O
by	O
the	O
late	O
Jun-ichiro	O
itojun	O
Hagino	O
is	O
available	O
as	O
nvi-m17n	O
.	O
</s>
<s>
A	O
currently-maintained	O
,	O
multibyte	O
version	O
is	O
available	O
as	O
nvi2	O
,	O
and	O
is	O
the	O
default	O
vi	B-Application
on	O
DragonFly	B-Application
BSD	I-Application
.	O
</s>
