Reported on the mailinglist:
"
I discovered recently that if an application running inside st tries to
send a DCS string, subsequent Unicode characters get messed up. For
example, consider the following test-case:
printf '\303\277\033P\033\\\303\277'
...where:
- \303\277 is the UTF-8 encoding of U+00FF LATIN SMALL LETTER Y WITH
DIAERESIS (ÿ).
- \033P is ESC P, the token that begins a DCS string.
- \033\\ is ESC \, a token that ends a DCS string.
- \303\277 is the same ÿ character again.
If I run the above command in a VTE-based terminal, or xterm, or
QTerminal, or pterm (PuTTY), I get the output:
ÿÿ
...which is to say, the empty DCS string is ignored. However, if I run
that command inside st (as of commit 9ba7ecf), I get:
ÿÿ
...where those last two characters are \303\277 interpreted as ISO8859-1
characters, instead of UTF-8.
I spent some time tracing through the state machines in st.c, and so far
as I can tell, this is how it works currently:
- ESC P sets the "ESC_DCS" and "ESC_STR" flags, indicating that
incoming bytes should be collected into the strescseq buffer, rather
than being interpreted.
- ESC \ sets the "ESC_STR_END" flag (when ESC is received), and then
calls strhandle() (when \ is received) to interpret the collected
bytes.
- If the collected bytes begin with 'P' (i.e. if this was a DCS
string) strhandle() sets the "ESC_DCS" flag again, confusing the
state machine.
If my understanding is correct, fixing the problem should be as easy as
removing the line that sets ESC_DCS from strhandle():
diff --git a/st.c b/st.c
index ef8abd5..b5b805a 100644
--- a/st.c
+++ b/st.c
@@ -1897,7 +1897,6 @@ strhandle(void)
xsettitle(strescseq.args[0]);
return;
case 'P': /* DCS -- Device Control String */
- term.mode |= ESC_DCS;
case '_': /* APC -- Application Program Command */
case '^': /* PM -- Privacy Message */
return;
I've tried the above patch and it fixes my problem, but I don't know if
it introduces any others.
"
Similar to the xterm AllowWindowOps option, this is an option to allow or
disallow certain (non-interactive) operations that can be insecure or
exploited.
NOTE: xsettitle() is not guarded by this because st does not support printing
the window title. Else this could be exploitable (arbitrary code execution).
Similar problems have been found in the past in other terminal emulators.
The sequence for base64-encoded clipboard copy is now guarded because it allows
a sequence written to the terminal to manipulate the clipboard of the running
user non-interactively, for example:
printf '\x1b]52;0;ZWNobyBoaQ0=\a'
Add the functionality back in for xterm compatibility, but do not expose the
capability in st.info (yet).
Some notes:
It was reverted because it caused some issues with ncurses in some
configurations, namely when using BSD padding (--enable-bsdpad, BSD_TPUTS) in
ncurses it caused issues with repeating digits.
A fix has been upstreamed in ncurses since snapshot 20200523. The fix is also
backported to OpenBSD -current.
This reverts commit e8392b282c.
There is currently a bug in older ncurses versions (like on OpenBSD) where a
fix for a bug with REP is not backported yet. Most likely in tty/tty_update.c:
Noticed while using lynx (which uses ncurses/curses).
To reproduce using lynx: echo "Z0000000" | lynx -stdin
or using the program:
int
main(void)
{
WINDOW *win;
win = initscr();
printw("Z0000000");
refresh();
sleep(5);
return 0;
}
This prints "ZZZZZZZ" (incorrectly).
The sequence \e[Nb prints the last printed char N (more) times if it's
printable, and it's ignored after newline or other control chars.
This is Ecma-048/ANSI-X3.6 sequence and not DEC VT. It's supported by
xterm, and ncurses uses it when possible, e.g. when TERM is xterm* (and
with this commit also st*).
xterm supports only codepoints<=255, possibly due to internal limits.
We support any value/codepoint which was placed in a cell.
To test:
- tput rep 65 4 -> prints 'AAAA'
- printf "\342\225\246\033[4b" -> prints U+2566 1+4 times.
St uses a very good hack where mouse wheel genereates ^Y and ^E,
that are the same keys that less and vi uses for backward and
fordward scrolling. Scroll, as many terminal emulators, use
shift+Prev/Next for scrolling, but it is also using ^E and ^Y
for scroling, characters that are reserved in the POSIX shell
in emacs mode for end of line and yanking, making scroll unsable
in st.
This patch adds a new hack, making shift+wheel returning the
same sequences than shift+Prev/Next, meaning that scroll or
any other similar program will not be able to differentiate
between them.
Fix an issue with incorrect (partial) written sequences when libc wcwidth() ==
-1. The sequence is updated to on wcwidth(u) == -1:
c = "\357\277\275"
but len isn't.
A way to reproduce in practise:
* st -o dump.txt
* In the terminal: printf '\xcd\xb8'
- This is codepoint 888, on OpenBSD it reports wcwidth() == -1.
- Quit the terminal.
- Look in dump.txt (partial written sequence of "UTF_INVALID").
This was introduced in:
" commit 11625c7166
Author: czarkoff@gmail.com <czarkoff@gmail.com>
Date: Tue Oct 28 12:55:28 2014 +0100
Replace character with U+FFFD if wcwidth() is -1
Helpful when new Unicode codepoints are not recognized by libc."
Change:
Remove setting the sequence. If this happens to break something, another
solution could be setting len = 3 for the sequence.
st could easily tear/flicker with animation or other unattended
output. This commit eliminates most of the tear/flicker.
Before this commit, the display timing had two "modes":
- Interactively, st was waiting fixed `1000/xfps` ms after forwarding
the kb/mouse event to the application and before drawing.
- Unattended, and specifically with animations, the draw frequency was
throttled to `actionfps`. Animation at a higher rate would throttle
and likely tear, and at lower rates it was tearing big frames
(specifically, when one `read` didn't get a full "frame").
The interactive behavior was decent, but it was impossible to get good
unattended-draw behavior even with carefully chosen configuration.
This commit changes the behavior such that it draws on idle instead of
using fixed latency/frequency. This means that it tries to draw only
when it's very likely that the application has completed its output
(or after some duration without idle), so it mostly succeeds to avoid
tear, flicker, and partial drawing.
The config values minlatency/maxlatency replace xfps/actionfps and
define the range which the algorithm is allowed to wait from the
initial draw-trigger until the actual draw. The range enables the
flexibility to choose when to draw - when least likely to flicker.
It also unifies the interactive and unattended behavior and config
values, which makes the code simpler as well - without sacrificing
latency during interactive use, because typically interactively idle
arrives very quickly, so the wait is typically minlatency.
While it only slighly improves interactive behavior, for animations
and other unattended-drawing it improves greatly, as it effectively
adapts to any [animation] output rate without tearing, throttling,
redundant drawing, or unnecessary delays (sounds impossible, but it
works).
St used to use backspace as BS until the commit 230d0c8, but due
to general lack of knowledge of lusers, we moved to the most common
configuration in linux to avoid answering the same question 3 times
per month. With the most common configuration we have a backspace
that returns a DEL, and we have a Delete key that doesn't return a
DEL character neither a BS.
When dealing with devices connected using a serial line (or even
with Plan9) it is more common Backspace as BS and Delete as DEL. For
this reason, st is not always the best tool when you talk with a
serial device.
This patch adds new terminfo entries for Backspace as BS and Delete
as DEL. A patch for confg.h is also added, to make easier switch
between both configurations.
When a read operation returns 0 then it means that we arrived to the end of the
file, and new reads will return 0 unless you do some other operation such as
lseek(). This case happens with USB-232 adapters when they are unplugged.
Scroll is a program that stores all the lines of its child and be used in st as
a way of implementing scrollback.
This solution is much better than implementing the scrollback in st itself
because having a different program allows to use it in any other program
without doing modifications to those programs.
This line didn't work at mshortcuts at config.h:
/* mask button function arg release */
{ ShiftMask, Button2, selpaste, {.i = 0}, 1 },
and now it does work.
The issue was that XButtonEvent.state is "the logical state ... just prior
to the event", which means that on release the state has the Button2Mask
bit set because button2 was down just before it was released.
The issue didn't manifest with the default shift + middle-click on release
(to override mouse mode) because its specified modifier is XK_ANY_MOD, at
which case match(...) ignores any specific bits and simply returns true.
The issue also doesn't manifest on press, because prior to the event
Button<N> was not down and its mask bit is not set.
Fix by filtering out the mask of the button which we're currently matching.
We could have said "well, that's how button events behave, you should
use ShiftMask|Button2Mask for release", but this both not obvious to
figure out, and specifically here always filtering does not prevent
configuring any useful modifiers combination. So it's a win-win.
XCreateIC ICValues default XNFocusWindow to XNClientWindow if not
specified, it can be omitted since it is the same.
From the documentation
https://www.x.org/releases/current/doc/libX11/libX11/libX11.html
> Focus Window
>
> The XNFocusWindow argument specifies the focus window. The primary
> purpose of the XNFocusWindow is to identify the window that will receive
> the key event when input is composed.
>
> When this XIC value is left unspecified, the input method will use the
> client window as the default focus window.
Do not try to set specific IM method, let the user specify it with
XMODIFIERS.
If the requested method is not available or opening fails, fallback to
the default input handler and register a handler on the new IM server
availability signal.
Do the same when the input server is closed and (re)started.
Current buffer is too short to input medium to long sentences from IME.
Input with longer text will show the wrong input, taking 64 instead of
32 bytes should be enough for most of the cases. Broken cases before,
Chinese (taken from song 也可以)
可不可以轻轻的松开自己
Japanese (taken from bootleggers rom quote)
あなたは家のように感じる
Strings which an application sends to the terminal in OSC, DCS, etc
are typically small (title, colors, etc) but one exception is OSC 52
which copies text to the clipboard, and is used for instance by tmux.
Previously st cropped these strings at 512 bytes, which for OSC 52
limited the copied text to 382 bytes (remaining buffer space before
base64). This made it less useful than it can be.
Now it's a dynamic growing buffer. It remains allocated after use,
resets to 512 when a new string starts, or leaked on exit.
Resetting/deallocating the buffer right after use (at strhandle) is
possible with some more code, however, it doesn't always end up used,
and to cover those cases too will require even more code, so resetting
only on new string is good enough for now.
STRescape holds strings in escape sequences such as OSC and DCS, and
its buffer is 512 bytes.
If the input is too big then trailing chars are ignored, but the test
was off-by-1 such that it took 510 chars instead of 511 (before a
terminating NULL is added).
Now the full size can be utilized.
Previously, base64dec checked terminating input '\0' every 4 calls to
base64dec_getc, where the latter progressed one or more chars on each
call, and could read past '\0' in the way it was used.
The input to base64dec currently comes only from OSC 52 escape seq
(copy to clipboard), and reading past '\0' or even past the buffer
boundary was easy to trigger.
Also, even if we could trust external input to be valid base64, there
are different base64 standards, and not all of them require padding
to 4 bytes blocks (using trailing '=' chars).
It didn't affect short OSC 52 strings because the buffer is initialized
to 0's, so typically it did stop within the buffer, but if the string
was trimmed to fit (the buffer is 512 bytes) then it did also read past
the end of the buffer, and the decoded suffix ended up arbitrary.
This patch makes base64dec_getc not progress past '\0', and instead
produce fake trailing padding of '='.
Additionally, at base64dec, if padding is detected at the first or
second byte of a quartet, then we identify it as invalid and abort
(a valid quartet has at least two leading non-padding bytes).
For WM_CLASS this is mentioned in the ICCCM docs
https://tronche.com/gui/x/icccm/sec-4.html#s-4.1.2.5
(third sentence).
When changing the WM_CLASS from the command line, this is necessary for
window managers to pick it up before applying class-based rules.
The recent mouse shurtcuts commits allow customization, but ignore
forcemousemod mask (default: shift) as a modifier, for no good reason
other than following the behavior of the KB shortcuts.
Allow using forcemousemod too, which now can be used to invoke
different shortcuts, though the automatic effect of forcemousemod will
be lost for buttons which use mask with forcemousemod.
E.g. the default is:
static uint forcemousemod = ShiftMask;
...
{ XK_ANY_MOD, Button4, ttysend, {.s = "\031"} },
...
where ttysend will be invoked for button4 with any mod when not in mouse
mode, and with shift when in mouse mode.
Now it's possible to do this:
{ ShiftMask, Button4, ttysend, {.s = "foo"} },
{ XK_ANY_MOD, Button4, ttysend, {.s = "\031"} },
Which will invoke ttysend("foo") while shift is held and ttysend("\031")
otherwise. Shift still overrides mouse mode, but will now send "foo".
Previously with this setup the second binding was always invoked
because the forceousemod mask was always removed from the event.
Buttons which don't use forcemousemod behave the same as before.
This is useful e.g. for the scrollback mouse patch, which wants to
configure shift+wheel for scrollback, while keeping the normal behavior
without shift.
Because selpaste is activated on release, a release flag was added to
mouse shortcuts which controls whether activation is on press/release,
and selpaste binding to button2 was moved to config.h .
button1 remains the only hardcoded mouse button - for selection + copy.
Allow forceselmod to override all mouse shortcuts rather than only
selection, and rename it to forcemousemod as it's now more appropriate.
This will affect mouse shortcuts which use mask other than XK_ANY_MOD.
This does not affect the default behavior because the default mouse
shortcuts (wheel) use XK_ANY_MOD, where forceselmod already activated
the override also before this change.
Previously, if a mouse shortcut was configured with a specific mod and
forceselmod was held, then the shortcut did not execute unless the
configured mod included forceselmod.
"use iswspace()/iswpunct() to find word delimiters
this inverts the configuration logic: you no longer provide a list of
delimiters -- all space and punctuation characters are considered
delimiters, unless listed in extrawordchars."
Feedback from IRC and personal preference.
this inverts the configuration logic: you no longer provide a list of
delimiters -- all space and punctuation characters are considered
delimiters, unless listed in extrawordchars.
Current font caching algorithm contains a use after free error. A font
removed from `frc` might be still listed in `wx.specbuf`. It will lead
to a crash inside `XftDrawGlyphFontSpec()`.
Steps to reproduce:
$ st -f 'Misc Tamsyn:scalable=false'
$ curl https://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-demo.txt
Of course, result depends on fonts installed on a system and fontconfig.
In my case, I'm getting consistent segfaults with different fonts.
I replaced a fixed array with a simple unbounded buffer with a constant
growth rate. Cache starts with a capacity of 0, gets increments by 16,
and never shrinks. On my machine after `cat UTF-8-demo.txt` buffer
reaches a capacity of 192. During casual use capacity stays at 0.
Features:
- Allow input methods swap with hotkey (E.g. left ctrl + left shift).
- Over-the-spot pre-editing style, pre-edit data placed over insertion point.
- Restart IME without segmentation fault.
TODO:
- Automatically pickup IME if st started before IME
This complements the work done in d4928ed, allowing the user to specify
the preprocessor flags with the CPPFLAGS environment variable. This is
useful for example to specify preprocessor macros with -D.
CFLAGS could be used instead, but CPPFLAGS is more correct and is expected
to be honored in some cases. For example, the helper scripts to build
Debian packages make use of CPPFLAGS, but the variable is currently
being ignored unless manually appended to CFLAGS.
When possible, declare functions/variables static and move struct
definitions out of headers. In order to allow utf8decode to become
internal, use codepoint for DECSCUSR extension directly.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
Prefer passing arguments to declaring external global variables. The
only remaining usage of extern is for config.h variables which are
needed in st.c instead of x.c (where it is now included).
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
The xinit function only needs to the rows/cols, so pass those in rather
than accessing term directly. With a bit of arithmetic, we are able to
avoid the need for term.row and term.col in x2col, y2row, and
xdrawglyphfontspecs as well, completing the removal.
Term is now fully internal to st.c.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
Gradually reducing x.c dependency on Term object. Old and new cursor
glyph/position are passed to xdrawcursor. (There may be an opportunity
to refactor further if we can unify "clear old cursor" and "draw new
cursor" functionality.)
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
Introduces three functions to encapsulate X-specific behavior:
* xdrawline: draws a portion of a single line (used by drawregion)
* xbegindraw: called to prepare for drawing (will be useful for e.g.
Wayland) and returns true if drawing should happen
* xfinishdraw: called to finish drawing (used by draw)
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
Moves the mode bits used by x.c from Term to TermWindow, absorbing
UI/input-related mode bits (visible/focused/numlock) along the way.
This is gradually reducing external references to Term. Since
TermWindow is already internal to x.c, we add xsetmode() to allow st to
modify window bits in accordance with escape sequences.
IS_SET() is redefined accordingly (term.mode in st.c, win.mode in x.c).
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
This also allows us to remove the crlf field from the Key struct, since
the only difference it made was converting "\r" to "\r\n" (which is now
done automatically in ttywrite). In addition, MODE_CRLF is no longer
referenced from x.c.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
The only thing differentiating ttywrite and ttysend was the potential
for echo; make this a parameter and remove ttysend.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
The "done" parameter indicates a change which finalizes the selection
(e.g. a mouse button release as opposed to motion).
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
The front-end determines information about mouse clicks and motion, and
the terminal handles the actual selection start/extend/dirty logic by
row and column.
While we're in the neighborhood, we'll also rename getbuttoninfo() to
mousesel() which is, at least, less wrong.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
This removes ttynew's dependency on cresize being called first, and then
allows us to absorb the ttyresize call into cresize (which always
precedes it).
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
None of the X-related includes are needed any longer. In addition, move
the X modifier defines into x.c, as they are not used outside.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
This is an X type and should be internal to x.c.
The selcopy() function was a single line and only used in one place, so
it was inlined to reduce LOC.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
There was only a single reference to the `win` variable in st.c, so
exporting that to x.c allows us to rid ourselves of another extern.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
config.h includes references to KeySyms and other X stuff. Until we
come up with a cleaner way to separate configuration, it is simpler
(leads to more code removal) to have this here.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
The echo-to-terminal portions of ttyread and ttysend were actually doing
the same thing. New function twrite() now handles this. The parameter
show_ctrl determines whether control characters are shown as "^A". This
was the only difference between tputc and techo, and techo is now unused
and removed.
(This commit should not change st's behaviour.)
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
This commit is purely about reducing externs and LOC. If the main and
run functions ever move elsewhere (which will probably make sense
eventually), these should come along with them.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
Modifiers and keysyms are specific to X, and the functions match and
kmap are only used in x.c. Needed to global-ize the key arrays and
lengths from config.h (for now).
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
This makes x(un)loadfonts internal to x.c. Needed to reorder includes
and move a typedef to keep the compiler happy.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
This makes xsetenv internal to x.c, and allows iso14755's external
command to use $WINDOWID instead of having to snprintf it again. (The
same benefit will apply to the externalpipe patch.) The xwinid function
is no longer needed.
Signed-off-by: Devin J. Pohly <djpohly@gmail.com>
An example where the new behaviour makes more sense:
Suppose some text is formatted with ATTR_FAINT for red for the foreground, so it
is rendered in a dark red. In that case, when selected with the mouse, the
intended behaviour is that foreground and background color are swapped: so the
selection should be rendered in dark red and the text in the default background
color.
Before this patch, what happened was that the selection would be in normal red
and the text in the darkened background color, making it almost unreadable.
For an example application that uses the FAINT attribute, try dmesg from
util-linux with color support, it uses FAINT for segfault messages.
This reverts commit 274d46ace0.
Sorry, the original commit was correct after all. It allows has the
correct link order and supports static-linking also.
Just a reminder: it is important to give a (brief) rationale of the
patch intentions.
Non-printable characters, such as line breaks, in a base64 encoded
string violate the "string length must be a multiple of four" rule.
This patch pads the result buffer by one extra unit of four bytes,
and skips over non-printable characters found in the input string.
This reverts commit 7f990328e4.
this was wrong as pointed out by k0ga:
"STLDFLAGS is about flags to the linker, for example -L
not about -l for that reason it must go before the object list".
This reverts commit 77c51c5a6b.
Having multiple clipboards are useful, for example for plumber scripts.
I've discussed this on IRC and it is useful to have.
st currently does not keep any mode for the cursor that was active
in the underlying glyph (e.g. italic text), the mode is always
ATTR_NULL [1]. At [2] you can find a screenshot that shows the
implications. Other terminals (at least vte-based, such as
XFCE-terminal) keep some modes for the cursor. I find the current
behaviour very disruptive, so here is a patch that keeps a few
(arbitrarily chosen) modes for the cursor.
[1] http://git.suckless.org/st/tree/st.c#n3963
[2] http://i.imgur.com/R2yCEaC.png
CTRL+SHIFT is an impossible combination in the terminal world
(0x20 | x & 0x1F), so it is perfect to be used for internals
shortcuts of terminals, and being a double combination
reduces the prossibility of having comflicts.
XftFontMatch does display-specific font configuration (commit 528241a).
Nice. Unfortunately, when we switched from FcFontMatch, we also stopped
storing the post-Fc{Config,Default}Substitute FcPattern for future
lookups. The result is that if a glyph isn't found in the primary font,
secondary font lookups use the original FcPattern, not the configured
one. If you have custom fontconfig rules (like me), this can be
disappointing.
I basically just copied the guts out of XftFontMatch[1] and saved
the intermediate configured FcPattern. Could be related to the bug that
inspired commit 4242027.
[1]: https://cgit.freedesktop.org/xorg/lib/libXft/tree/src/xftfont.c
When using st with screen, I've bound next, prev, new screen to
combinations like Ctrl-Alt-Right,Left,Down; xterm and (u)rxvt work fine
when this combination of modifiers is pressed, st does not seem to
transport all of them; a single modifier key is fine (e.g. Ctrl-Up,
Alt-Down etc., but combinations are not). While I'm not terribly
familiar with this, I have tried to hack config.h in a more or less
systematic way to generate the expected sequences.
Hi,
When I specify a font by point size (I'm using "Inconsolata:size=12"),
characters that are substituted from another font because they are not in the
main one appear too small. Doing a zoom reset fixes it. For example:
Before: http://i.imgur.com/G4Mfv4X.png
After: http://i.imgur.com/PMDhfQA.png
I found that adding the pixel size (acquired from the initial font load) to the
pattern then reloading the font fixes the problem. I'm not sure if this is a
proper fix, though.
The two functions strdump(), csidump() are called to show errors and
their output is introduced by a message printed to stderr. Thus, it it
more consistent to have them print to stderr.
Moreover stderr is unbuffered (at least on Linux), making problems
immediately visible.
These sequences are used to operate with sixels, but they are still
str sequences, so they are finished with \a, ST or with a C1 control
code. This patch also disables utf8 handling for the case of sixels.
There are some ocasions where we want to disable the enconding/decoding of utf8, mainly
because it adds an important overhead. This is partial patch for ESC % G and ESC % @,
where they modified the way that st reads and write from/to the serial line, but it does
not modifies how it interacts with the X window part.
The default config specifies BackSpace as "\177". The default behavior
should persist across modifier keys, commonly Mod1 (Alt or Meta) which
is widely used to delete a word on readline and text editors, notably
Emacs.
This will make Alt+BackSpace behaves as expected, i.e. sends "\033\177"
instead of "\033\010" as previous default behavior.
Signed-off-by: Christoph Lohmann <20h@r-36.net>
https://tronche.com/gui/x/icccm/sec-2.html#s-2.4 specifies:
> Once all the data in the selection has been retrieved,
> the requestor should delete the property in the SelectionNotify request
Most Clipboard-Owners ignore whether or not the property is already set,
so this is mostly a cosmetic change to keep the windows property list clean.
However, at least synergy decides to wait for the requestor to delete
the properties if they are already set by a previous paste (from synergy).
Signed-off-by: Christoph Lohmann <20h@r-36.net>
LEN(str) is one larger than strlen(str) because it also counts the zero
terminator. The original code would include the .notdef glyph (since it'll
try to encode character 0, which gets encoded to the .notdef glyph) when
measuring the average dimensions of printable ascii characters.
This causes problems with fonts like GNU Unifont where the .notdef glyph is
not the same width as the usual half-width characters.
Signed-off-by: Christoph Lohmann <20h@r-36.net>
The y-position of a character found by asking fontconfig for a matching
font does not take the border pixels into account, resulting in a
slightly misaligned vertical position.
Signed-off-by: Ton van den Heuvel <tonvandenheuvel@gmail.com>
Signed-off-by: Christoph Lohmann <20h@r-36.net>
This fix is needed to use dual-width fonts, which have double-width
glyphs (e.g. CJK unified ideographs).
Signed-off-by: Ryusei Yamaguchi <mandel59@gmail.com>
Signed-off-by: Christoph Lohmann <20h@r-36.net>
This prevents accessing to a potentially out-of-bounds memory section.
Signed-off-by: Lucas Gabriel Vuotto <l.vuotto92@gmail.com>
Signed-off-by: Christoph Lohmann <20h@r-36.net>
Scratch the preceding patch, this one is more correct
(don't forget to 'git am --scissors' ;))
-- >8 --
Also reformat the strings in a saner layout
Signed-off-by: Christoph Lohmann <20h@r-36.net>
This way we can call cresize() to set the terminal size before creating
a tty or spawning a process, which will start with the correct size.
Signed-off-by: Christoph Lohmann <20h@r-36.net>
ARGUM isn't used and ARGNUMF uses estrtol() that isn't defined anywhere.
Those were probably copied from sbase arg.h.
Signed-off-by: Christoph Lohmann <20h@r-36.net>
ttywrite was assuming that if it could not write then it could
read, but this is not necessarily true, there are some situations
where you cannot read or write. The correct behaviour is to detect
if you can read or/and write.
If we want to show a custom selected cursor color, we must not set the
revert attribute to the drawn glyph.
Signed-off-by: Christoph Lohmann <20h@r-36.net>
Before the fix the cursor wouldn't obey if it's in a selection. If it is
inside it will now change to the reverse. This patch also adds that the
defaultcs will be reversed for the manually drawn cursors.
Before this patch, when pasting over BUFSIZE (8192 bytes here), st would
do the following:
\e[200~...8192 bytes...\e[201~\e[200~...remaining bytes...\e[201~
With this patch, the start marker is only sent when the offset is 0 (at
the beginning of selnotify) and the end marker is only sent when the
remaining bytes to read are 0 (at the end).
For short pastes, both conditions are true in the same iteration.
For long pastes, it removes the extra markers in the middle, keeping the
intended wrapping:
\e[200~...8192 bytes......remaining bytes...\e[201~
Signed-off-by: Christoph Lohmann <20h@r-36.net>
gcc would warn about an unused result. We know it is 0 and dup()
can't fail in these circumstances, as we closed fd0 previously.
Using dup2() to do the same saves one line and shuts gcc up, bringing
us a clean build back.
When a line has no any character linelen is 0, so last = &term.line[y][MIN(lastx, linelen-1)]
generated a pointer to the end of the previous line. The best thing we can do in this case
is to add a newline, because we don't have a glyph to print (and consult its state of
wrapping).
wcwidth() returns -1 for all the non visible characters, but it doesn't
necessarilly mean that they are incorrect. It only means that they are not
printable.
A little fix in xwrite().
>From 3727d2e3344b57128ab51c7839795204f1f839ff Mon Sep 17 00:00:00 2001
From: Quentin Rameau <quinq@fifth.space>
Date: Fri, 24 Jul 2015 11:40:46 +0200
Subject: [PATCH] Fix type for write(2) return variable.
The allocated lengh of s fits into an integer so we can safely use
ssize_t here.
This practice proved itself in sbase, ubase and a couple of other
projects.
Also remove the True and False defined in X11 and FcTrue and FcFalse
defined in Fontconfig.
Signed-off-by: Christoph Lohmann <20h@r-36.net>
Any system having different assignments than the usual 0, 1, 2 for
the standard file numbers and 0, 1 for the exit-statuses is broken
beyond repair.
Let's keep it simple and just use the numbers, no reason to fall
out of the window here and bend down for POSIX.
In one occasion, the ret-variable was not necessary. The check was
rewritten.
Signed-off-by: Christoph Lohmann <20h@r-36.net>
For a higher usefulness of the utf8strchr function, the index of the
UTF-8 character could be returned in addition with a Rune instead of a
char*. Since utf8strchr is currently only used by ISDELIM I didn't
bother to increase the complexity.
Here's a patch that fixes a bug when calling `makedrawglyphfontspecs'
in `drawregion'. Wasn't offseting the pointer into the input glyphs
array by `x1'. The bug isn't causing any problems currently, because
`drawregion' is always called with `x1' and `y1' values of 0, but if
this ever changes in the future, the bug would certainly cause some
problems.
I have another patch here for review that optimizes the performance of
glyph drawing, primarily when using non-unit kerning values, and fixes a
few other minor issues. It's dependent on the earlier patch from me that
stores unicode codepoints in a Rune type, typedef'd to uint_least32_t.
This patch is a pretty big change to xdraws so your scrutiny is
appreciated.
First, some performance numbers. I used Yu-Jie Lin termfps.sh shell
script to benchmark before and after, and you can find it in the
attachments. On my Kaveri A10 7850k machine, I get the following
results:
Before Patch
============
1) Font: "Liberation Mono:pixelsize=12:antialias=false:autohint=false"
cwscale: 1.0, chscale: 1.0
For 273x83 100 frames.
Elapsed time : 1.553
Frames/second: 64.352
Chars /second: 1,458,159
2) Font: "Inconsolata:pixelsize=14:antialias=true:autohint=true"
cwscale: 1.001, chscale: 1.001
For 239x73 100 frames.
Elapsed time : 159.286
Frames/second: 0.627
Chars /second: 10,953
After Patch
===========
3) Font: "Liberation Mono:pixelsize=12:antialias=false:autohint=false"
cwscale: 1.0, chscale: 1.0
For 273x83 100 frames.
Elapsed time : 1.544
Frames/second: 64.728
Chars /second: 1,466,690
4) Font: "Inconsolata:pixelsize=14:antialias=true:autohint=true"
cwscale: 1.001, chscale: 1.001
For 239x73 100 frames.
Elapsed time : 1.955
Frames/second: 51.146
Chars /second: 892,361
As you can see, while the improvements for fonts with unit-kerning is
marginal, there's a huge ~81x performance increase with the patch when
using kerning values other than 1.0.
So what does the patch do?
The `xdraws' function would render each glyph one at a time if non-unit
kerning values were configured, and this was the primary cause of the
slow down. Xft provides a handful of functions which allow you to render
multiple characters or glyphs at time, each with a unique <x,y> position,
so it was simply a matter of massaging the data into a format that would
allow us to use one of these functions.
I've split `xdraws' up into two functions. In the first pass with
`xmakeglyphfontspecs' it will iterate over all of the glyphs in a given
row and it will build up an array of corresponding XftGlyphFontSpec
records. Much of the old logic for resolving fonts for glyphs using Xft
and fontconfig went into this function.
The second pass is done with `xrenderglyphfontspecs' which contains the
old logic for determining colors, clearing the background, and finally
rendering the array of XftGlyphFontSpec records.
There's a couple of other things that have been improved by this patch.
For instance, the UTF-32 codepoints in the Line's were being re-encoded
back into UTF-8 strings to be passed to `xdraws' which in turn would then
decode back to UTF-32 to verify that the Font contained a matching glyph
for the code point. Next, the UTF-8 string was being passed to
`XftDrawStringUtf8' which internally mallocs a scratch buffer and decodes
back to UTF-32 and does the lookup of the glyphs all over again.
This patch gets rid of all of this redundant round-trip encoding and
decoding of characters to be rendered and only looks up the glyph index
once (per font) during the font resolution phase. So this is probably
what's responsible for the marginal improvements seen when kerning values
are kept to 1.0.
I imagine there are other performance improvements here too, not seen in
the above benchmarks, if the user has lots of non-ASCII code plane characters
on the screen, or several different fonts are being utilized during
screen redraw.
Anyway, if you see any problems, please let me know and I can fix them.
When user clicks LMB, one character is selected, but will not be copied
to selection until the user moves cursor a bit. Therefore, the character
should not be highlighted as selected yet.
Before the patch, the trick was not to mark line as dirty to avoid
highlighting it. However, if user has already selected something and
clicks in line that contains selection, selclear sets the line as dirty
and one character is highlighted when it should not.
This patch replaces dirty trick with explicit check for sel.mode inside
selected().
This patch also prevents sel.mode from increasing beyond 2. It is almost
impossible, but sel.mode may overflow if mouse is moved around for too
long while selecting.
st.c:1321:2: warning: ignoring return value of function declared with warn_unused_result attribute [-Wunused-result]
system(cmd);
^~~~~~ ~~~
Debatable whether an error here should case exit(EXIT_FAILURE). Just
preserving the existing behaviour for now.
Not always is desirable to create a pseudo terminal, and some times
we want to open a terminal emulator over a tty line. With this new
patch is possible to do someting like:
$ st -l /dev/ttyS0 115200
Without this option was needed to launch another terminal emulator
over st (for example minicom, picocom, cu, ...).
ICCCM mandates the use of real timestamps to interact with the
selection, to rule out race conditions if the clients are run at
different speeds. I have implemented the low hanging fruit, putting the
timestamps into text selection. Also, ICCCM mandates a check for whether
XSetSelectionOwner() worked. Not sure my version is correct, though.
tmoveto resets CURSOR_WRAPNEXT.
Simple testcase:
for i in $(seq 1 200); do
printf '\t.';
usleep 100000;
printf '\t@';
usleep 100000;
done
In st executing this script causes @ and . to overwrite each other in
the last column.
XFilterEvent usually filters KeyPress events according to input method.
At this point the window is not mapped. The only events that we process
are ConfigureNotify and MapNotify. They should not be filtered by input
method.
strsep() is not a POSIX function, and it means that every system
needs different defines to expose it. If the prototype of strsep
is not exposed then an ugly int/pointer is done and it might mean
a crash. The best solution?, to remove the strsep and make a custom
loop. If C programmers cannot do this kind of loops without calling
a library function, then maybe we should move all the suckless
software to Java.
Some programs can only deal with XA_STRING, and it makes impossible st
be able of copying to them. This patch makes st answer also to XA_STRING,
althought it sends utf8 strings. It is not a problem because moderm
applications must support utf8.
Thanks to Alex Pilon <alp@alexpilon.ca>!
Now there is a distinction between the primary and clipboard selection. With
Mod + Shift + c/v the clipboard is handled. The old Insert behavious does
reside.
The unicode long is added to the cache. So when fontconfig does fall back to
the default font (where there is no easy way to find this out from the
pattern) it isn't reloaded.
ncurses wasn't able to detect the delete-character key as KEY_DC. This
patch fixes that.
kdch1 was defined as "\0177", but terminfo(5) states:
... characters may be given as three octal digits after a \.
The delete-character key is correctly defined in config.def.h.
Use the terminfo delay syntax ($<x>) in our flash capability to avoid
hardcoding a fixed delay in redraw() when called from tsetmode() with
DECSCNM.
We need to turn on the npc capability so that delays are made with
xon/xoff instead of padding characters.
When MODE_INSERT is set we'd shift characters on the same
line forward before inserting our character in tputc().
This did not account for wide characters where width != 1.
This patch makes it so we shift the correct amount.
In tputc(), when a character wasn't large enough to fit
on the current line, we would call tnewline() to place it on
the next line. Unfortunately, we weren't resetting our glyph
pointer and this caused memory corruption when a
wide character (width == 2) was being written. This patch
resets our glyph pointer after calls to tnewline().
If blinktimeout is set to a value greater than 1000, pselect will
receive a timeout argument with tv_nsec greater than 1E9 (1 sec), and
fail, making st crash. This patch just ensures that the timespec
structure is correctly filled with a value properly decomposed between
tv_sec and tv_nsec.
Reported by JasonWoof on IRC. Thanks!
Trailing whitespaces are trimmed when copying from normal selection and
rectangular selection on lines that have their last character included
or on the left of the selection. It leads to inconsistent behaviors when
copying the exact same text from the left and right window in
applications with vertical splits.
This patch solves this issue by always trimming the selection.
- POSIX states the SHELL environment variable "... shall represent a
pathname of the user's preferred command language interpreter." As
such, st should check for its presence when deciding what shell to
use; just as HOME can be defined to override one's passwd-defined home
directory, a user should also be able to override their passwd-defined
shell using the SHELL environment variable.
These are needed by ncurses to correctly handle the switch between line
drawing. The changes to the alternative characterset code already fixed the
urwid hack.
The XBell() call currently used when a bell is recieved sends a message
to the X server, but if the X server doesn't know how to sound it,
it just gets ignored and I have not been able to find anywhere in x.org's
code a way to configure the action that the server does.
However, if you use XkbBell() then you can have a process listening for
the XkbBellNotifyEvent that is produced and either alert you visually or
play an audio file or whatever you want as your notification. You have
to include one more header file but the function seems to be compiled as
part of Xlib, at least on my installation.
CustaiCo
St has enacs, which must be printed if a program requires to use
the alternate charset (graphic charset), that in st case was to
select charset graphic for G1, but it was not useful
at all because smacs and rmacs were always redefining the value
of G0.
SI (0x0F or ^O) means Shift In, and it selects G1 charset definition,
and SO (0x0E or ^N) means Shift Out, and it selects G0 charset
definition, but st was doing just the inverse.
Hiltjo Posthuma
John Collis
Steve Ward
Avi Halachmi (:avih)
Roberto E. Vargas
Jakub Leszczak
Jan Klemkow
Ivan Tham
Quentin Rameau
Sebastian J. Bronner
Ingo Lohmar
Lauri Tirkkonen
magras
Paride Legovini
Jules Maselbas
Daniel Tameling
Devin J. Pohly
Benno Fünfstück
George Ornbo
Gary Allen Vollink
Suraj N. Kurapati
Anselm R Garbe
Marc André Tanner
greg.reagle@umbc.edu
Alexander Krotov
Nils Reuße
osandov@osandov.com
Michael Forney
fpqc
Spencer Phippen
Manuel Tobias Schiller
ian@remmler.org
Klemens Nanni
Roberto E. Vargas Caballero
Christoph Lohmann
Alive 4ever
v4hn
Tor Andersson
Ton van den Heuvel
Ryusei Yamaguchi
Lucas Gabriel Vuotto
Quentin Rameau
Jason Woofenden
dequis
FRIGN
Jan Christoph Ebersbach
Alex Kozadaev
Mytchel Hammond
Weng Xuetian
Quentin Rameau
suigin
noname
Jochen Sprickerhof
mvdan@mvdan.cc
alp@alexpilon.ca
sin
Markus Wichmann
LemonBoy
Alexander Huemer
Ivan Delalande
Johannes Postma
Nils Reuße
Rian Hunter
Rian Hunter
Eric Pruitt
czarkoff@gmail.com
Quentin Rameau
CustaiCo
