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.
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).
"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.
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
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>
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.
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
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.
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>
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>
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.
