bug#19350: 24.4; Incorrect quoting of %-signs for Windows command shell

[Demetrios Obenour]

Looking at the code in subr.el, it is clear that Emacs mishandles
%-signs when escaping for the Windows command interpreter.

The Windows command interpreter looks at %-signs before looking at
carets. While the present method of escaping may appear to work, this is
only because environment variables with carets in their names are very
unlikely.

A method of handling % that I believe to be fully
robust is to follow (not precede) each series of % characters with
%CD:~,0%. This is an expansion that always expands to the empty
string. It will work provided that:

* Command Extensions are enabled.

* It is not possible for cmd.exe to interpret an environment variable
  whose name is the empty string.

Emacs is not the only program to have such a bug. The D programming
language has such a bug also, in its standard library (In fact, I
discovered the solution while looking for a fix to the bug).

I deleted the lossage from the report, as there is no point in including
it, this being a logic error in subr.el. In fact, the buggy code is dead
on my machine (I run Linux) -- I happened to know about the problem on
Windows.

Sincerely,

Demetrios Obenour



In GNU Emacs 24.4.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.14.5)
 of 2014-11-19 on buildvm-03.phx2.fedoraproject.org
Windowing system distributor `Fedora Project', version 11.0.11602000
System Description:     Fedora release 21 (Twenty One)

Configured using:
 `configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
 --with-gpm=no build_alias=x86_64-redhat-linux-gnu
 host_alias=x86_64-redhat-linux-gnu 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
 -grecord-gcc-switches -m64 -mtune=generic' 'LDFLAGS=-Wl,-z,relro ''

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  display-time-mode: t
  display-battery-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-idle-scheduler-mode: t
  show-paren-mode: t
  semantic-mode: t
  tooltip-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:

uncompressing subr.el.gz...done
Note: file is write protected
Auto-saving...done
 [3 times]
<mode-line> <mouse-5> is undefined [2 times]
byte-code: End of buffer

Auto-saving...done


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tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer 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 make-network-process dbusbind gfilenotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty emacs)

Memory information:
((conses 16 131086 10758)
 (symbols 48 24584 0)
 (miscs 40 74 292)
 (strings 32 28561 5229)
 (string-bytes 1 900434)
 (vectors 16 15635)
 (vector-slots 8 449292 7938)
 (floats 8 84 523)
 (intervals 56 736 0)
 (buffers 960 14)
 (heap 1024 46826 991))