GNU bug report logs - #36573
26.1; bufferpos-to-filepos assumes coding-system-eol-type gives integer

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Rupert Swarbrick <rswarbrick <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1;
 bufferpos-to-filepos assumes coding-system-eol-type gives integer
Date: Wed, 10 Jul 2019 11:52:24 +0100

Hi there,

The bufferpos-to-filepos function assumes that the return value fo
coding-system-eol-type is an integer, testing it with

 (let* ((eol (coding-system-eol-type coding-system))
        (lineno (if (= eol 1) (1- (line-number-at-pos position)) 
        0))
        ...)
   ...)

However, coding-system-eol-type may return a list if the given 
coding
system doesn't specify eol conversion explicitly.

This crops up for me when trying to browse info files:

 Debugger entered--Lisp error: (wrong-type-argument 
 number-or-marker-p [undecided-unix undecided-dos undecided-mac])
   =([undecided-unix undecided-dos undecided-mac] 1)
   (if (= eol 1) (1- (line-number-at-pos position)) 0)
   (let* /* SNIP contents of bufferpos-to-filepos */)
   bufferpos-to-filepos(1202 exact)
   Info-read-subfile(1200)
   Info-find-node-2("/usr/share/info/gawk" "Top" nil nil)
   Info-find-node("gawk" "Top" nil nil)
   Info-goto-node("(gawk)" nil)
   Info-menu("Gawk" nil)
   funcall-interactively(Info-menu "Gawk" nil)
   call-interactively(Info-menu nil nil)
   command-execute(Info-menu)

(I've snipped out the contents of bufferpos-to-filepos from the
backtrace). It seems that the coding system for the info file is
'undecided at this point.

I'm not sure where the bug lies. If bufferpos-to-filepos (and
filepos-to-bufferpos) are supposed to work with an undecided 
coding
system, they need fixing. Manually replacing "(= eol ...)" with 
"(eql
eol ...)" locally in both functions means that I can read the info 
file
again (yippee!) but I'm not sure whether that's a full solution.

Alternatively, I guess the documentation for these functions needs 
to
say that they should only be called when the coding system 
specifies eol
conversion. In this case, the info code also needs fixing (and
presumably various other places).

Auto-collected info below. This is a Debian system with reasonably
standard packages, plus some org-related stuff from elpa.


Rupert


Configured using:
'configure --build x86_64-linux-gnu --prefix=/usr
--sharedstatedir=/var/lib --libexecdir=/usr/lib
--localstatedir=/var/lib --infodir=/usr/share/info
--mandir=/usr/share/man --enable-libsystemd --with-pop=yes
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils --build
x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
--libexecdir=/usr/lib --localstatedir=/var/lib
--infodir=/usr/share/info --mandir=/usr/share/man 
--enable-libsystemd
--with-pop=yes
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils --with-x=yes
--with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
-fdebug-prefix-map=/build/emacs-26.1+1=. -fstack-protector-strong
-Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
-D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS 
NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LIBSYSTEMD LCMS2

Important settings:
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 value of $LC_NUMERIC: en_GB.utf8
 value of $LC_TIME: en_GB.utf8
 value of $LANG: en_GB.UTF-8
 locale-coding-system: utf-8

Major mode: Info

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 line-number-mode: t

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/home/rupert/.emacs.d/elpa/org-20171009/ob-R hides 
/usr/share/emacs/26.1/lisp/org/ob-R
/home/rupert/.emacs.d/elpa/org-20171009/ob-J hides 
/usr/share/emacs/26.1/lisp/org/ob-J
/home/rupert/.emacs.d/elpa/org-20171009/ob-C hides 
/usr/share/emacs/26.1/lisp/org/ob-C
/usr/share/emacs/site-lisp/flim/sasl hides 
/usr/share/emacs/26.1/lisp/net/sasl
/usr/share/emacs/site-lisp/flim/sasl-ntlm hides 
/usr/share/emacs/26.1/lisp/net/sasl-ntlm
/usr/share/emacs/site-lisp/flim/sasl-digest hides 
/usr/share/emacs/26.1/lisp/net/sasl-digest
/usr/share/emacs/site-lisp/flim/sasl-cram hides 
/usr/share/emacs/26.1/lisp/net/sasl-cram
/usr/share/emacs/site-lisp/flim/ntlm hides 
/usr/share/emacs/26.1/lisp/net/ntlm
/usr/share/emacs/site-lisp/flim/hmac-md5 hides 
/usr/share/emacs/26.1/lisp/net/hmac-md5
/usr/share/emacs/site-lisp/flim/hmac-def hides 
/usr/share/emacs/26.1/lisp/net/hmac-def

Features:
(shadow sort mail-extr emacsbug helm-external helm-net xml url 
url-proxy
url-privacy url-expand url-methods url-history url-cookie 
url-domsuf
url-util mailcap cl-print debug winner helm-command helm-elisp 
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eieio-custom
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magit magit-repos magit-apply magit-wip magit-log which-func imenu
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filenotify magit-margin magit-transient magit-process magit-mode
transient git-commit magit-git magit-section magit-utils crm 
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mml-sec epa
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server dash cl-extra help-mode use-package use-package-ensure
use-package-delight use-package-diminish use-package-bind-key 
bind-key
easy-mmode use-package-core derived subr-x finder-inf tex-site
highline-autoloads proof-site proof-autoloads slime-autoloads info
package easymenu epg-config url-handlers url-parse auth-source 
cl-seq
eieio eieio-core cl-macs eieio-loaddefs password-cache url-vars 
seq
byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib 
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devhelp time-date mule-util tooltip eldoc electric uniquify 
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vc-hooks lisp-float-type mwheel term/x-win x-win term/common-win 
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replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar mouse 
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cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai 
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korean japanese eucjp-ms cp51932 hebrew greek romanian slovak 
czech
european ethiopic indian cyrillic chinese composite charscript 
charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray 
minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify 
lcms2
dynamic-setting system-font-setting font-render-setting 
move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 748565 52312)
(symbols 48 62892 7)
(miscs 40 270 398)
(strings 32 192397 6437)
(string-bytes 1 5948028)
(vectors 16 92954)
(vector-slots 8 1758995 68914)
(floats 8 521 411)
(intervals 56 3844 3512)
(buffers 992 21))

Message #8 received at 36573 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Rupert Swarbrick <rswarbrick <at> gmail.com>
Cc: 36573 <at> debbugs.gnu.org
Subject: Re: bug#36573: 26.1;
 bufferpos-to-filepos assumes coding-system-eol-type gives integer
Date: Wed, 10 Jul 2019 17:52:58 +0300

> From: Rupert Swarbrick <rswarbrick <at> gmail.com>
> Date: Wed, 10 Jul 2019 11:52:24 +0100
> 
> The bufferpos-to-filepos function assumes that the return value fo
> coding-system-eol-type is an integer, testing it with
> 
>   (let* ((eol (coding-system-eol-type coding-system))
>          (lineno (if (= eol 1) (1- (line-number-at-pos position)) 
>          0))
>          ...)
>     ...)
> 
> However, coding-system-eol-type may return a list if the given 
> coding system doesn't specify eol conversion explicitly.

That shouldn't happen for a buffer that visits a file, in general.

> This crops up for me when trying to browse info files:
> 
>   Debugger entered--Lisp error: (wrong-type-argument 
>   number-or-marker-p [undecided-unix undecided-dos undecided-mac])
>     =([undecided-unix undecided-dos undecided-mac] 1)
>     (if (= eol 1) (1- (line-number-at-pos position)) 0)
>     (let* /* SNIP contents of bufferpos-to-filepos */)
>     bufferpos-to-filepos(1202 exact)
>     Info-read-subfile(1200)
>     Info-find-node-2("/usr/share/info/gawk" "Top" nil nil)
>     Info-find-node("gawk" "Top" nil nil)
>     Info-goto-node("(gawk)" nil)
>     Info-menu("Gawk" nil)
>     funcall-interactively(Info-menu "Gawk" nil)
>     call-interactively(Info-menu nil nil)
>     command-execute(Info-menu)

Please show the entire recipe for reproducing this, starting from
"emacs -Q".  Info files should generally have the -unix EOL type;
that's what I see here.  So I wonder how did we get into this
situation.

> (I've snipped out the contents of bufferpos-to-filepos from the
> backtrace). It seems that the coding system for the info file is
> 'undecided at this point.

On my system, "C-u C-h i /path/to/gawk.info RET" yields a buffer whose
buffer-file-coding-system is undecided-unix, as I'd expect.  This
happens both on GNU/Linux and on MS-Windows.  So I wonder how you get
something different.  One can get undecided with empty buffers, or
buffers that don't have a single newline, but this is not that case.

> I'm not sure where the bug lies. If bufferpos-to-filepos (and
> filepos-to-bufferpos) are supposed to work with an undecided 
> coding system, they need fixing.

This function cannot possibly work with an encoding that has no
definite EOL type, because obviously the conversion of buffer
positions to file offsets depends on that.

> Manually replacing "(= eol ...)" with "(eql eol ...)" locally in
> both functions means that I can read the info file again (yippee!)
> but I'm not sure whether that's a full solution.

It could be, but we should first understand how did that happen,
because there might be deeper problems hiding here.

> Alternatively, I guess the documentation for these functions needs
> to say that they should only be called when the coding system
> specifies eol conversion.

That should be done regardless, I think.  But since this function was
written specifically for Info files, it must work there (and did,
AFAIK, since the day it was written till now).

Message #11 received at 36573 <at> debbugs.gnu.org (full text, mbox):

From: Rupert Swarbrick <rswarbrick <at> gmail.com>
To: 36573 <at> debbugs.gnu.org
Subject: 26.1;
 bufferpos-to-filepos assumes coding-system-eol-type gives integer
Date: Fri, 12 Jul 2019 16:14:33 +0100

Thank you for the reply. I've now found the "culprit" (bisecting 
my init.el starting with emacs -Q). The dubious setting was:

 '(file-coding-system-alist
    (quote
     (("\\.dz\\'" no-conversion . no-conversion)
      ("\\.g?z\\(~\\|\\.~[0-9]+~\\)?\\'" no-conversion . 
      no-conversion)
      ("\\.tgz\\'" no-conversion . no-conversion)
      ("\\.tbz\\'" no-conversion . no-conversion)
      ("\\.bz2\\(~\\|\\.~[0-9]+~\\)?\\'" no-conversion . 
      no-conversion)
      ("\\.Z\\(~\\|\\.~[0-9]+~\\)?\\'" no-conversion . 
      no-conversion)
      ("\\.elc\\'" emacs-mule . emacs-mule)
      ("\\.utf\\(-8\\)?\\'" . utf-8)
      ("\\(\\`\\|/\\)loaddefs.el\\'" raw-text . raw-text-unix)
      ("\\.tar\\'" no-conversion . no-conversion)
      ("\\.po[tx]?\\'\\|\\.po\\." . po-find-file-coding-system)
      ("\\.lisp\\'" . utf-8-unix))))

I can't remember why I had this setting, rather than the default 
value, but clearing it out means I can read the info manual again.

I think it probably still makes sense to add a note to the manual 
for bufferpos-to-filepos and filepos-to-bufferpos to point out 
that they don't work if the line ending convention is unknown.

For bonus points, maybe it makes sense to add something to fail 
earlier (and more understandably!) in the info reading code. I'm 
not sure exactly where that would be, though.


Rupert

Message #14 received at 36573 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Rupert Swarbrick <rswarbrick <at> gmail.com>
Cc: 36573 <at> debbugs.gnu.org
Subject: Re: bug#36573: 26.1;
 bufferpos-to-filepos assumes coding-system-eol-type gives integer
Date: Fri, 12 Jul 2019 21:17:47 +0300

> From: Rupert Swarbrick <rswarbrick <at> gmail.com>
> Date: Fri, 12 Jul 2019 16:14:33 +0100
> 
> Thank you for the reply. I've now found the "culprit" (bisecting 
> my init.el starting with emacs -Q). The dubious setting was:
> 
>   '(file-coding-system-alist
>      (quote
>       (("\\.dz\\'" no-conversion . no-conversion)
>        ("\\.g?z\\(~\\|\\.~[0-9]+~\\)?\\'" no-conversion . 
>        no-conversion)
>        ("\\.tgz\\'" no-conversion . no-conversion)
>        ("\\.tbz\\'" no-conversion . no-conversion)
>        ("\\.bz2\\(~\\|\\.~[0-9]+~\\)?\\'" no-conversion . 
>        no-conversion)
>        ("\\.Z\\(~\\|\\.~[0-9]+~\\)?\\'" no-conversion . 
>        no-conversion)
>        ("\\.elc\\'" emacs-mule . emacs-mule)
>        ("\\.utf\\(-8\\)?\\'" . utf-8)
>        ("\\(\\`\\|/\\)loaddefs.el\\'" raw-text . raw-text-unix)
>        ("\\.tar\\'" no-conversion . no-conversion)
>        ("\\.po[tx]?\\'\\|\\.po\\." . po-find-file-coding-system)
>        ("\\.lisp\\'" . utf-8-unix))))

Was the Info file compressed, i.e. did it have one of extensions that
caused no-conversion to be used?

> I think it probably still makes sense to add a note to the manual 
> for bufferpos-to-filepos and filepos-to-bufferpos to point out 
> that they don't work if the line ending convention is unknown.
> 
> For bonus points, maybe it makes sense to add something to fail 
> earlier (and more understandably!) in the info reading code. I'm 
> not sure exactly where that would be, though.

Yes, something should be done there, thanks.

Message #17 received at 36573 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Rupert Swarbrick <rswarbrick <at> gmail.com>
Cc: 36573 <at> debbugs.gnu.org
Subject: Re: bug#36573: 26.1; bufferpos-to-filepos assumes
 coding-system-eol-type gives integer
Date: Wed, 11 Aug 2021 20:42:08 +0200

Rupert Swarbrick <rswarbrick <at> gmail.com> writes:

> Thank you for the reply. I've now found the "culprit" (bisecting my
> init.el starting with emacs -Q). The dubious setting was:
>
>  '(file-coding-system-alist
>     (quote
>      (("\\.dz\\'" no-conversion . no-conversion)

(etc)

Even with this setting, I'm not able to reproduce the problem.  It would
be helpful with a recipe, starting from "emacs -Q", to verify that we're
fixing this in the correct way.

> I think it probably still makes sense to add a note to the manual for
> bufferpos-to-filepos and filepos-to-bufferpos to point out that they
> don't work if the line ending convention is unknown.

Well, manual does say that the coding system has to be known (which
implies that the line ending convention should also be known)...

> For bonus points, maybe it makes sense to add something to fail
> earlier (and more understandably!) in the info reading code. I'm not
> sure exactly where that would be, though.

I think those functions probably shouldn't signal an error in this
situation if asked to do an approximate calculation (but just guess at a
one-byte ending), perhaps.  But give a better error message when asked
to do an exact calculation.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #20 received at 36573 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 36573 <at> debbugs.gnu.org, rswarbrick <at> gmail.com
Subject: Re: bug#36573: 26.1;
 bufferpos-to-filepos assumes coding-system-eol-type gives integer
Date: Thu, 12 Aug 2021 11:21:07 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Date: Wed, 11 Aug 2021 20:42:08 +0200
> Cc: 36573 <at> debbugs.gnu.org
> 
> > I think it probably still makes sense to add a note to the manual for
> > bufferpos-to-filepos and filepos-to-bufferpos to point out that they
> > don't work if the line ending convention is unknown.
> 
> Well, manual does say that the coding system has to be known (which
> implies that the line ending convention should also be known)...
> 
> > For bonus points, maybe it makes sense to add something to fail
> > earlier (and more understandably!) in the info reading code. I'm not
> > sure exactly where that would be, though.
> 
> I think those functions probably shouldn't signal an error in this
> situation if asked to do an approximate calculation (but just guess at a
> one-byte ending), perhaps.  But give a better error message when asked
> to do an exact calculation.

I think, since these cases are very rare, it should be okay to assume
the -unix EOL type when this happens, and document that if this is the
case, the result could be an approximation even if the exact result
was requested.

Message #23 received at 36573 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 36573 <at> debbugs.gnu.org, rswarbrick <at> gmail.com
Subject: Re: bug#36573: 26.1; bufferpos-to-filepos assumes
 coding-system-eol-type gives integer
Date: Thu, 12 Aug 2021 14:54:51 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> I think, since these cases are very rare, it should be okay to assume
> the -unix EOL type when this happens, and document that if this is the
> case, the result could be an approximation even if the exact result
> was requested.

It is a rare odd corner case, but I think erroring out is a better
solution here than having to document this.  :-)  `exact' meaning
"exact" is easier conceptually.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #26 received at 36573 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 36573 <at> debbugs.gnu.org, rswarbrick <at> gmail.com
Subject: Re: bug#36573: 26.1; bufferpos-to-filepos assumes
 coding-system-eol-type gives integer
Date: Thu, 12 Aug 2021 16:08:05 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: rswarbrick <at> gmail.com,  36573 <at> debbugs.gnu.org
> Date: Thu, 12 Aug 2021 14:54:51 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > I think, since these cases are very rare, it should be okay to assume
> > the -unix EOL type when this happens, and document that if this is the
> > case, the result could be an approximation even if the exact result
> > was requested.
> 
> It is a rare odd corner case, but I think erroring out is a better
> solution here than having to document this.  :-)  `exact' meaning
> "exact" is easier conceptually.

Fine with me, but I think we will still need to say in the doc string
something like

  It is an error to request the `exact' method when the buffer's EOL
  format is not yet decided.

Message #29 received at 36573 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 36573 <at> debbugs.gnu.org, rswarbrick <at> gmail.com
Subject: Re: bug#36573: 26.1; bufferpos-to-filepos assumes
 coding-system-eol-type gives integer
Date: Fri, 13 Aug 2021 13:07:00 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> Fine with me, but I think we will still need to say in the doc string
> something like
>
>   It is an error to request the `exact' method when the buffer's EOL
>   format is not yet decided.

Done now, and I've added a bunch of tests for these functions.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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