* bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
@ 2022-05-30 13:08 Петров Андрей
2022-05-30 13:42 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-30 14:06 ` Eli Zaretskii
0 siblings, 2 replies; 8+ messages in thread
From: Петров Андрей @ 2022-05-30 13:08 UTC (permalink / raw
To: 55727
Hello, team!
Please check the following behavior:
1. Start two instances of emacs -Q.
2. Switch to the "*scratch*" buffer of the first one and type the following:
M-: (insert (format "%S" "000\000000")) [RET]
You should see "000^@000" string.
3. Copy the string into clipboard and paste into the other instance of
Emacs (which you have started before).
I get "000\0000" instead of "000\000000"
4. Try evaluating inserted text ("000\0000")
C-c C-e
I get "000^@0" instead of "000^@000".
It seems that "^@" is transcoded between applications into "\0"
instead of "\000". If I do the same test inside single instance
of Emacs I get the correct result.
In GNU Emacs 29.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.24.34, cairo version 1.17.6)
of 2022-05-30 built on pva-msi
Repository revision: 004e6ae3f42bdc8cd632060f56dbf8c1ea850c4a
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Arch Linux
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB
Important settings:
value of $LANG: ru_RU.UTF-8
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
line-number-mode: t
indent-tabs-mode: t
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message mailcap yank-media rmc puny
dired dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg
rfc6068 epg-config gnus-util text-property-search seq gv byte-opt
bytecomp byte-compile cconv mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils time-date subr-x cl-loaddefs
cl-lib cyril-util iso-transl tooltip eldoc paren electric uniquify
ediff-hook vc-hooks lisp-float-type elisp-mode mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode lisp-mode prog-mode register
page tab-bar menu-bar rfn-eshadow isearch easymenu timer select
scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors
frame minibuffer nadvice simple cl-generic indonesian philippine cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit xinput2 x multi-tty
make-network-process emacs)
Memory information:
((conses 16 43966 8699)
(symbols 48 5718 1)
(strings 32 15667 1941)
(string-bytes 1 509558)
(vectors 16 11167)
(vector-slots 8 162892 11831)
(floats 8 23 52)
(intervals 56 457 0)
(buffers 992 11))
Best regards,
Andrey Petrov.
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
2022-05-30 13:08 bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications Петров Андрей
@ 2022-05-30 13:42 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-30 14:27 ` Петров Андрей
2022-05-30 14:06 ` Eli Zaretskii
1 sibling, 1 reply; 8+ messages in thread
From: Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2022-05-30 13:42 UTC (permalink / raw
To: Петров Андрей
Cc: 55727
Петров Андрей <an.petrov@pay-lab.ru> writes:
> Hello, team!
>
> Please check the following behavior:
>
> 1. Start two instances of emacs -Q.
> 2. Switch to the "*scratch*" buffer of the first one and type the following:
> M-: (insert (format "%S" "000\000000")) [RET]
> You should see "000^@000" string.
> 3. Copy the string into clipboard and paste into the other instance of
> Emacs (which you have started before).
> I get "000\0000" instead of "000\000000"
> 4. Try evaluating inserted text ("000\0000")
> C-c C-e
> I get "000^@0" instead of "000^@000".
>
> It seems that "^@" is transcoded between applications into "\0"
> instead of "\000". If I do the same test inside single instance
> of Emacs I get the correct result.
That's not a bug. Most programs cannot tolerate NUL bytes inside
selection strings, so the Emacs selection converter deliberately
replaces those inside a string with "\0" before sending the string to a
requestor.
When one Emacs instance owns the selection, the contents of the kill
ring are used directly when yanking text, so that conversion doesn't
take place.
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
2022-05-30 13:08 bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications Петров Андрей
2022-05-30 13:42 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2022-05-30 14:06 ` Eli Zaretskii
1 sibling, 0 replies; 8+ messages in thread
From: Eli Zaretskii @ 2022-05-30 14:06 UTC (permalink / raw
To: Петров Андрей
Cc: 55727
> From: Петров Андрей <an.petrov@pay-lab.ru>
> Date: Mon, 30 May 2022 13:08:52 +0000
>
> 1. Start two instances of emacs -Q.
> 2. Switch to the "*scratch*" buffer of the first one and type the following:
> M-: (insert (format "%S" "000\000000")) [RET]
> You should see "000^@000" string.
> 3. Copy the string into clipboard and paste into the other instance of
> Emacs (which you have started before).
> I get "000\0000" instead of "000\000000"
> 4. Try evaluating inserted text ("000\0000")
> C-c C-e
> I get "000^@0" instead of "000^@000".
>
> It seems that "^@" is transcoded between applications into "\0"
> instead of "\000". If I do the same test inside single instance
> of Emacs I get the correct result.
Yes. And it's a feature. From select.el:
;; Most programs are unable to handle NUL bytes in strings.
(setq str (string-replace "\0" "\\0" str))
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
2022-05-30 13:42 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2022-05-30 14:27 ` Петров Андрей
2022-05-30 15:42 ` Eli Zaretskii
2022-05-31 0:16 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 2 replies; 8+ messages in thread
From: Петров Андрей @ 2022-05-30 14:27 UTC (permalink / raw
To: Po Lu; +Cc: 55727@debbugs.gnu.org
Hi, Po.
OK, You can close the bug then.
Just tell me if Emacs have ready to use solution for passing binary
strings between applications in a form what can be correctly restored
with `read' function. I found that output of `print' also can not be
transferred through application boundary.
С уважением,
Андрей Петров,
программист ООО Инпас-Софт.
________________________________________
От: Po Lu <luangruo@yahoo.com>
Отправлено: 30 мая 2022 г. 18:42:51
Кому: Петров Андрей
Копия: 55727@debbugs.gnu.org
Тема: Re: bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
Петров Андрей <an.petrov@pay-lab.ru> writes:
> Hello, team!
>
> Please check the following behavior:
>
> 1. Start two instances of emacs -Q.
> 2. Switch to the "*scratch*" buffer of the first one and type the following:
> M-: (insert (format "%S" "000\000000")) [RET]
> You should see "000^@000" string.
> 3. Copy the string into clipboard and paste into the other instance of
> Emacs (which you have started before).
> I get "000\0000" instead of "000\000000"
> 4. Try evaluating inserted text ("000\0000")
> C-c C-e
> I get "000^@0" instead of "000^@000".
>
> It seems that "^@" is transcoded between applications into "\0"
> instead of "\000". If I do the same test inside single instance
> of Emacs I get the correct result.
That's not a bug. Most programs cannot tolerate NUL bytes inside
selection strings, so the Emacs selection converter deliberately
replaces those inside a string with "\0" before sending the string to a
requestor.
When one Emacs instance owns the selection, the contents of the kill
ring are used directly when yanking text, so that conversion doesn't
take place.
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
2022-05-30 14:27 ` Петров Андрей
@ 2022-05-30 15:42 ` Eli Zaretskii
2022-05-30 16:23 ` Петров Андрей
2022-05-31 0:16 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
1 sibling, 1 reply; 8+ messages in thread
From: Eli Zaretskii @ 2022-05-30 15:42 UTC (permalink / raw
To: Петров Андрей
Cc: luangruo, 55727-done
> Cc: "55727@debbugs.gnu.org" <55727@debbugs.gnu.org>
> From: Петров Андрей <an.petrov@pay-lab.ru>
> Date: Mon, 30 May 2022 14:27:43 +0000
>
> OK, You can close the bug then.
Done.
> Just tell me if Emacs have ready to use solution for passing binary
> strings between applications in a form what can be correctly restored
> with `read' function. I found that output of `print' also can not be
> transferred through application boundary.
Did you consider encoding it in base64?
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
2022-05-30 15:42 ` Eli Zaretskii
@ 2022-05-30 16:23 ` Петров Андрей
2022-05-30 18:09 ` Eli Zaretskii
0 siblings, 1 reply; 8+ messages in thread
From: Петров Андрей @ 2022-05-30 16:23 UTC (permalink / raw
To: Eli Zaretskii; +Cc: luangruo@yahoo.com, 55727-done@debbugs.gnu.org
Hi, Eli!
Looks like I have to use hex, base64 or other ASCII encodings.
It seems that I will use something like this:
(defun my-escape-char (c)
(insert (if (< c ?\s) (format "\\%03o" c) c)))
(print "000\000000" 'my-escape-char)
Best regards,
Andrey Petrov.
________________________________________
От: Eli Zaretskii <eliz@gnu.org>
Отправлено: 30 мая 2022 г. 20:42:49
Кому: Петров Андрей
Копия: luangruo@yahoo.com; 55727-done@debbugs.gnu.org
Тема: Re: bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
> Cc: "55727@debbugs.gnu.org" <55727@debbugs.gnu.org>
> From: Петров Андрей <an.petrov@pay-lab.ru>
> Date: Mon, 30 May 2022 14:27:43 +0000
>
> OK, You can close the bug then.
Done.
> Just tell me if Emacs have ready to use solution for passing binary
> strings between applications in a form what can be correctly restored
> with `read' function. I found that output of `print' also can not be
> transferred through application boundary.
Did you consider encoding it in base64?
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
2022-05-30 16:23 ` Петров Андрей
@ 2022-05-30 18:09 ` Eli Zaretskii
0 siblings, 0 replies; 8+ messages in thread
From: Eli Zaretskii @ 2022-05-30 18:09 UTC (permalink / raw
To: Петров Андрей
Cc: luangruo, 55727
> From: Петров Андрей <an.petrov@pay-lab.ru>
> CC: "luangruo@yahoo.com" <luangruo@yahoo.com>, "55727-done@debbugs.gnu.org"
> <55727-done@debbugs.gnu.org>
> Date: Mon, 30 May 2022 16:23:46 +0000
>
> Hi, Eli!
>
> Looks like I have to use hex, base64 or other ASCII encodings.
> It seems that I will use something like this:
>
> (defun my-escape-char (c)
> (insert (if (< c ?\s) (format "\\%03o" c) c)))
>
> (print "000\000000" 'my-escape-char)
Emacs has base64-encode-region and base64-decode-region, so you could
use that instead.
^ permalink raw reply [flat|nested] 8+ messages in thread
* bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications
2022-05-30 14:27 ` Петров Андрей
2022-05-30 15:42 ` Eli Zaretskii
@ 2022-05-31 0:16 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
1 sibling, 0 replies; 8+ messages in thread
From: Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2022-05-31 0:16 UTC (permalink / raw
To: Петров Андрей
Cc: 55727@debbugs.gnu.org
Петров Андрей <an.petrov@pay-lab.ru> writes:
> Hi, Po.
>
> OK, You can close the bug then.
Thanks, closed.
> Just tell me if Emacs have ready to use solution for passing binary
> strings between applications in a form what can be correctly restored
> with `read' function. I found that output of `print' also can not be
> transferred through application boundary.
You could encode the data in a format such as base64, or alternatively
pass it as input to a subprocess. Selections are probably the wrong
thing to use for this.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2022-05-31 0:16 UTC | newest]
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-- links below jump to the message on this page --
2022-05-30 13:08 bug#55727: 29.0.50; Incorrect zero symbol transcoding between applications Петров Андрей
2022-05-30 13:42 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-30 14:27 ` Петров Андрей
2022-05-30 15:42 ` Eli Zaretskii
2022-05-30 16:23 ` Петров Андрей
2022-05-30 18:09 ` Eli Zaretskii
2022-05-31 0:16 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-30 14:06 ` Eli Zaretskii
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