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

[Rupert Swarbrick <rswarbrick@gmail.com>]

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:
  value of $LC_MONETARY: en_GB.utf8
  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

Minor modes in effect:
  show-paren-mode: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  global-ede-mode: t
  savehist-mode: t
  recentf-mode: t
  rcirc-track-minor-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  eyebrowse-mode: t
  pdf-occur-global-minor-mode: t
  pyvenv-mode: t
  global-magit-file-mode: t
  diff-auto-refine-mode: t
  magit-auto-revert-mode: t
  global-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t

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/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 
helm-eval
edebug helm-info helm-mode helm-files helm-buffers helm-occur 
helm-tags
helm-locate helm-grep helm-regexp helm-utils helm-types helm-help 
helm
helm-source eieio-compat helm-multi-match helm-lib misearch
multi-isearch highlight-parentheses redshank skeleton paren
elisp-slime-nav mu4e desktop frameset mu4e-speedbar mu4e-main 
mu4e-view
mu4e-headers mu4e-compose mu4e-context mu4e-draft mu4e-actions
org-capture rfc2368 smtpmail sendmail mu4e-mark mu4e-message 
flow-fill
html2text mu4e-proc mu4e-utils doc-view mu4e-lists mu4e-vars 
org-element
avl-tree generator ob-dot ob-maxima org org-macro org-footnote
org-pcomplete org-list org-faces org-entities org-version 
ob-emacs-lisp
ob ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-exp 
ob-comint
ob-core ob-eval org-compat org-macs org-loaddefs cal-menu calendar
cal-loaddefs hl-line mu4e-meta keyfreq shebang smooth-scrolling 
pg-vars
ede/speedbar ede/files ede ede/detect ede/base ede/auto ede/source
eieio-base eieio-speedbar speedbar sb-image ezimage dframe 
eieio-custom
cc-styles cc-align cc-engine cc-vars cc-defs slime-fancy
slime-trace-dialog slime-fontifying-fu slime-package-fu 
slime-references
slime-compiler-notes-tree slime-scratch slime-presentations bridge
slime-macrostep macrostep slime-mdot-fu slime-enclosing-context
slime-fuzzy slime-fancy-trace slime-fancy-inspector slime-c-p-c
slime-editing-commands slime-autodoc slime-repl slime-parse slime
arc-mode archive-mode hyperspec browse-url dired-x info-look
solarized-light-theme solarized savehist recentf tree-widget rcirc
undo-tree diff cl company-irony company-template irony-completion
irony-snippet irony irony-iotask proof-general eyebrowse 
haskell-mode
haskell-cabal haskell-utils haskell-font-lock haskell-indentation
haskell-string haskell-sort-imports haskell-lexeme rx
haskell-align-imports haskell-compat haskell-complete-module
haskell-ghc-support noutline outline dabbrev haskell-customize 
pdf-occur
ibuf-ext ibuffer ibuffer-loaddefs tablist tablist-filter
semantic/wisent/comp semantic/wisent semantic/wisent/wisent
semantic/util-modes semantic/util semantic semantic/tag 
semantic/lex
semantic/fw mode-local find-func cedet pdf-isearch let-alist 
pdf-misc
pdf-tools pdf-view magit-bookmark bookmark pp jka-compr pdf-cache
pdf-info tq pdf-util image-mode yasnippet elec-pair
highlight-indentation flymake-proc flymake warnings company-capf 
company
pcase help-fns radix-tree elpy find-file-in-project ivy flx delsel 
colir
color ivy-overlay ffap thingatpt windmove elpy-shell pyvenv 
esh-var
esh-io esh-cmd esh-opt esh-ext esh-proc esh-arg esh-groups eshell
esh-module esh-mode esh-util elpy-profile elpy-django s 
elpy-refactor
python tramp-sh tramp tramp-compat tramp-loaddefs trampver 
ucs-normalize
parse-time json map ido grep compile files-x etags xref project 
cus-edit
cus-start cus-load wid-edit paredit edmacro kmacro magit-submodule
magit-obsolete magit-popup magit-blame magit-stash magit-reflog
magit-bisect magit-push magit-pull magit-fetch magit-clone 
magit-remote
magit-commit magit-sequence magit-notes magit-worktree magit-tag
magit-merge magit-branch magit-reset magit-files magit-refs 
magit-status
magit magit-repos magit-apply magit-wip magit-log which-func imenu
magit-diff smerge-mode diff-mode magit-core magit-autorevert 
autorevert
filenotify magit-margin magit-transient magit-process magit-mode
transient git-commit magit-git magit-section magit-utils crm 
log-edit
message rmc puny dired dired-loaddefs format-spec rfc822 mml 
mml-sec epa
epg gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode
mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr
mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log 
with-editor
async-bytecomp advice async shell pcomplete comint ansi-color ring
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 
w3m-load
devhelp time-date mule-util tooltip eldoc electric uniquify 
ediff-hook
vc-hooks lisp-float-type 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 elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar mouse 
jit-lock
font-lock syntax facemenu font-core term/tty-colors frame 
cl-generic
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 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))