On March 23, 2021, Nokia transferred the copyrights in the Plan 9 software
to the Plan 9 Foundation, which relicensed them under the MIT license.
This commit updates the Plan 9 from User Space license to reflect the
new base license. The vast majority of the contributions beyond the
base Plan 9 set were by me, many of them explicitly under an MIT license.
Those are all under the new MIT license now as well.
The port of mk to Unix was taken from Inferno via Vita Nuova and had
been made available under GPL, but Vita Nuova has relicensed Inferno
under the MIT license as well, to match the new Plan 9 license.
Michael Teichgraber contributed src/lib9/zoneinfo.c explicitly under
the Lucent Public License but has agreed to change the contribution
to the MIT license now used in the rest of the distribution.
There remain a few exceptions, most notably fonts.
See the root LICENSE file for full details.
The only mention of the Lucent Public License in the whole tree now
is in the LICENSE file, explaining the history.
MacFUSE 4 removes support for passing device fd to the mount command. Adds
support for the receiving the fd over a socket instead, and updates command paths
and filesystem name.
Use bio(3) to read at most one line of input per iteration, even
if there is more than one line available in the input buffer. This
makes it easier to interact with line-oriented ctl files like that of
factotum(4) from shell scripts, without the need to control when
and how much data is flushed to a pipe.
Usually r->nused < r->nalloc and the read is in bounds.
But it could in theory be right on the line and reading
past the end of the allocation.
Make it safe but preserve as much of the old semantics
as possible. This use of rterm appears to be only for
optimization purposes so the result does not matter
for correctness.
For whatever reason all three of these programs
contain switches like:
switch(x) {
case 1:
if(cond)
case 2:
f();
}
Like Duff's device, this is legal C but more obscure
than it really needs to be.
This commit assumes those are intended as written
and simply writes them more clearly. I did consider
that maybe they are mistakes, but in the case of sam/regexp.c,
my rewrite in this commit matches the acme/regx.c that
has been in plan9port since I added acme in 2003.
(I didn't bother to dig up the old Plan 9 releases.)
Assuming acme/regx.c has been correct for the past
two decades, this commit should be correct too.
Programs that want to background themselves now need
to define threadmaybackground returning 1.
This avoids a confusing (to people and debuggers)
extra parent process for all the threaded programs
that will never want to background themselves.
Drawing as white on black to produce a mask only works if
the white on black is the inversion of black on white.
Emoji that force use of specific colors don't respect that.
Draw black on white and invert to mask separately.
This fixes https://github.com/9fans/plan9port/issues/436
This doesn't necessarily address the underlying issue: calling p9create with
mode = OREAD should probably be allowed, but currently doesn't work on
OpenBSD.
Unclear why it is here (wkj added it long ago).
It has never been installed into $PLAN9/bin,
so it's doubtful that anyone has ever used it.
Arnold Robbins has an alternate version at
https://github.com/arnoldrobbins/dformat.
Fixes#421.
List mode was constrained to the BMP. This change introduces
the following new list mode convention, using Go string literal syntax:
Non-printing ASCII characters display as \xhh.
Non-ASCII characters in the BMP display as \uhhhh.
Characters beyond the BMP display as \Uhhhhhhhh.
Runes in Plan 9 were limited to the 16-bit BMP when I drew up
the RPC protocol between graphical programs and devdraw
a long time ago. Now that they can be 32-bit, use a 32-bit wire
encoding too. A new message number to avoid problems with
other clients (like 9fans.net/go).
Add keyboard shortcut alt : , for U+1F602, face with tears of joy,
to test that it all works.
This fixes at least one shell script (printfont) that expected
'x'`{y}'z'
to mean
'x'^`{y}^'z'
as it now does. Before it meant:
'x'^`{y} 'z'
One surprise is that adjacent lists get a free carat:
(x y z)(1 2 3)
is
(x1 y2 z3)
This doesn't affect any rc script in Plan 9 or plan9port.
The old yacc-based parser is available with the -Y flag,
which will probably be removed at some point.
The new -D flag dumps a parse tree of the input,
without executing it. This allows comparing the output
of rc -D and rc -DY on different scripts to see that the
two parsers behave the same.
The rc paper ends by saying:
It is remarkable that in the four most recent editions of the UNIX
system programmer’s manual the Bourne shell grammar described in the
manual page does not admit the command who|wc. This is surely an
oversight, but it suggests something darker: nobody really knows what
the Bourne shell’s grammar is. Even examination of the source code is
little help. The parser is implemented by recursive descent, but the
routines corresponding to the syntactic categories all have a flag
argument that subtly changes their operation depending on the context.
Rc’s parser is implemented using yacc, so I can say precisely what the
grammar is.
The new recursive descent parser here has no such flags.
It is a straightforward translation of the yacc.
The new parser will make it easier to handle free carats
in more generality as well as potentially allow the use of
unquoted = as a word character.
Going through this exercise has highlighted a few
dark corners here as well. For example, I was surprised to
find that
x >f | y
>f x | y
are different commands (the latter redirects y's output).
It is similarly surprising that
a=b x | y
sets a during the execution of y.
It is also a bit counter-intuitive
x | y | z
x | if(c) y | z
are not both 3-phase pipelines.
These are certainly not things we should change, but they
are not entirely obvious from the man page description,
undercutting the quoted claim a bit.
On the other hand, who | wc is clearly accepted by the grammar
in the manual page, and the new parser still handles that test case.
