Commit Graph

836 Commits (ef0551932fb162f907b40185d2f48c3b497708ee)

Author SHA1 Message Date
NRK ef0551932f base64_digits: reduce scope, implicit zero, +1 size
the array is not accessed outside of base64dec() so it makes sense to
limit it's scope to the related function. the static-storage duration of
the array is kept intact.

this also removes unnecessary explicit zeroing from the start and end of
the array. anything that wasn't explicitly zero-ed will now be
implicitly zero-ed instead.

the validity of the new array can be easily confirmed via running this
trivial loop:

	for (int i = 0; i < 255; ++i)
		assert(base64_digits[i] == base64_digits_old[i]);

lastly, as pointed out by Roberto, the array needs to have 256 elements
in order to able access it as any unsigned char as an index; the
previous array had 255.

however, this array will only be accessed at indexes which are
isprint() || '=' (see `base64dec_getc()`), so reducing the size of the
array to the highest printable ascii char (127 AFAIK) + 1 might also be
a valid strategy.
2022-03-18 12:20:27 +01:00
NRK af3bb68add avoid potential UB when using isprint()
all the ctype.h functions' argument must be representable as an unsigned
char or as EOF, otherwise the behavior is undefined.
2022-03-18 12:11:27 +01:00
Santtu Lakkala e823e2308f Delay redrawals on palette changes
Build on auto-sync and only mark window dirty on palette changes and let
the event handler do the actual draw.
2022-02-18 13:03:37 +01:00
jamin 65f1dc4283 Fix overtyping wide characters.
Overtyping the first half of a wide character with the
second half of a wide character results in display garbage.
This is because the trailing dummy is not cleaned up.

i.e.  ATTR_WIDE, ATTR_WDUMMY, ATTR_WDUMMY

Here is a short script for demonstrating the behavior:

	#!/bin/sh
	alias printf=/usr/bin/printf
	printf こんにちは!; sleep 2
	printf '\x1b[5D'; sleep 2
	printf へ; sleep 2
	printf ' '; sleep 2
	echo
2021-12-30 18:37:17 +01:00
Jochen Sprickerhof a0467c802d Fix null pointer access in strhandle
According to the spec the argument is optional for 104, so p can be
NULL as can be tested with printf '\x1b]104\x07'. This is a regression
of 8e31030.
2021-12-27 13:07:11 +01:00
Hiltjo Posthuma 273db5ceaf follow-up fix for OSC color sequences, return
Otherwise the message "erresc: unknown str" is printed.
2021-12-26 19:00:41 +01:00
Raheman Vaiya 8e31030390 Add support for OSC color sequences 2021-12-26 18:57:44 +01:00
Koichi Murase 1d3142da96 fix a problem that the standard streams are unexpectedly closed
In the current implementation, the slave PTY (assigned to the variable
`s') is always closed after duplicating it to file descriptors of
standard streams (0, 1, and 2).  However, when the allocated slave PTY
`s' is already one of 0, 1, or 2, this causes unexpected closing of a
standard stream.  The same problem occurs when the file descriptor of
the master PTY (the variable `m') is one of 0, 1, or 2.

In this patch, the original master PTY (m) is closed before it would
be overwritten by duplicated slave PTYs.  The original slave PTY (s)
is closed only when it is not one of the stanrad streams.
2021-08-24 13:30:11 +02:00
Markus F.X.J. Oberhumer 4536f46cff Mild const-correctness improvements.
Only touch a few things, the main focus is to
improve code readability.
2021-05-06 18:21:10 +02:00
Hiltjo Posthuma 4ef0cbd8b9 remove unused variable from previous patch 2020-10-18 11:18:03 +02:00
John Collis 28b4c822c5 ST: Add WM_ICON_NAME property support
Also added _NET_WM_ICON_NAME.
2020-10-18 11:17:11 +02:00
Hiltjo Posthuma f74a9df6e1 remove sixel stub code
Remove stub code that was used for an experiment of adding sixel code to st
from the commit f7398434.
2020-06-17 23:49:22 +02:00
Hiltjo Posthuma 818ec746f4 fix unicode glitch in DCS strings, patch by Tim Allen
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.
"
2020-06-17 21:35:39 +02:00
Hiltjo Posthuma a2a704492b config.def.h: add an option allowwindowops, by default off (secure)
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'
2020-05-30 22:06:15 +02:00
Hiltjo Posthuma e6e2c6199f tiny style fix 2020-05-30 22:05:17 +02:00
Hiltjo Posthuma 94b8ec0021 Partially add back in "support REP (repeat) escape sequence"
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.
2020-05-30 22:04:28 +02:00
Hiltjo Posthuma 475a0a36cb Revert "support REP (repeat) escape sequence"
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).
2020-05-16 21:06:13 +02:00
Avi Halachmi (:avih) e8392b282c support REP (repeat) escape sequence
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.
2020-05-16 14:08:10 +02:00
Jakub Leszczak 045a0fab4f Fix selection: selscroll 2020-05-12 15:38:17 +02:00
Jakub Leszczak 9c30066e73 Fix selection: ignore ATTR_WRAP when rectangular selection in getsel 2020-05-12 15:38:02 +02:00
Jakub Leszczak 8304d4f059 Fix selection: selclear in tputc 2020-05-12 15:37:59 +02:00
Hiltjo Posthuma 914fb825df code-style: add fallthrough comment
Patch by Steve Ward, thanks.
2020-05-09 14:43:31 +02:00
Hiltjo Posthuma cde480c693 optimize column width calculation and utf-8 encode for ASCII
In particular on OpenBSD and on glibc wcwidth() is quite expensive.
On musl there is little difference.
2020-05-09 14:11:25 +02:00
Hiltjo Posthuma 8211e36d28 fix for incorrect (partial) written sequences when libc wcwidth() == -1
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.
2020-05-09 14:07:52 +02:00
Hiltjo Posthuma 87545c612e tiny code-style and typo-fix in comment 2020-05-09 14:05:04 +02:00
Jan Klemkow d6ea0a1a61 replace exit(3) by _exit(2) in signal handler sigchld()
exit(3) is not async-signal-safe but, _exit(2) is.
This change prevents st to crash and dump core.
2020-04-30 01:21:21 +02:00
Ivan Tham 72e3f6c7c0 Update XIM cursor position only if changed
Updating XIM cursor position is expensive, so only update it when cursor
position changed.
2020-04-19 19:39:48 +02:00
Hiltjo Posthuma 33a9a45664 just remove the EOF message 2020-04-11 15:45:06 +02:00
Hiltjo Posthuma e997303502 Fix small typos 2020-04-11 15:23:23 +02:00
Quentin Rameau c1145268f6 Launch scroll program with the default shell 2020-04-11 15:23:23 +02:00
Roberto E. Vargas Caballero fbae700a3f Fix style issue 2020-04-11 15:23:23 +02:00
Roberto E. Vargas Caballero e52319cc7d ttyread: test for EOF while reading tty
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.
2020-04-11 15:23:23 +02:00
Roberto E. Vargas Caballero 21e0d6e8b8 Add support for scroll(1)
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.
2020-04-11 15:23:20 +02:00
Avi Halachmi (:avih) 2e54a21b5a OSC 52 - copy to clipboard: don't limit to 382 bytes
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.
2019-11-10 22:45:54 +01:00
Hiltjo Posthuma 289c52b7aa CSIEscape, STREscape: use size_t for buffer length 2019-11-10 22:45:54 +01:00
Avi Halachmi (:avih) 7ceb3d1f72 STREscape: don't trim prematurely
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.
2019-11-10 22:45:54 +01:00
Avi Halachmi (:avih) ea4d933ed9 base64dec: don't read out of bounds
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).
2019-11-10 22:45:54 +01:00
Avi Halachmi (:avih) f1546cf9c1 selection: fix view to match actual selection on first cell 2019-04-14 13:50:20 +02:00
Hiltjo Posthuma 21367a040f revert part of commit add0211522
"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.
2019-03-15 20:40:16 +01:00
Hiltjo Posthuma b650256044 dont print color warning on color reset OSC 104 without parameter
also print explicitly "(null)" when printf "%s" p=NULL.

noticed when exiting mutt: printf '\x1b]104\x07'
2019-03-15 14:47:08 +01:00
Hiltjo Posthuma 9acec468fb minor code-style, initialize var at the top of function 2019-03-15 14:42:50 +01:00
Lauri Tirkkonen add0211522 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.
2019-03-15 12:25:13 +01:00
Lauri Tirkkonen d5efd256aa replace utf8strchr with wcschr 2019-03-15 12:24:13 +01:00
Lauri Tirkkonen 75b4ba4b4b be silent about explicitly unhandled mouse modes 2019-03-13 17:51:58 +01:00
Hiltjo Posthuma 4e0135afec style: remove double empty newlines 2019-03-03 11:23:54 +01:00
Ivan Tham e85b6b6466 better Input Method Editor (IME) support
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
2019-02-12 18:45:15 +01:00
Lauri Tirkkonen 096b125db7 output child WEXITSTATUS/WTERMSIG on abnormal termination 2018-12-11 18:36:02 +01:00
Hiltjo Posthuma b4d68d4daa st: small typofix in comment 2018-11-04 14:30:56 +01:00
Hiltjo Posthuma 30ec9a3dc3 small code-style fix 2018-09-11 19:06:35 +02:00
Quentin Rameau 67d0cb65d0 Remove the ISO 14755 feature
And move it to the patches section.
Keeping it would force to add an exec pledge on OpenBSD, and some
people think it's bloated, so bye!
2018-09-11 19:05:55 +02:00