Package: emacs;
Reported by: Demetrios Obenour <demetriobenour <at> gmail.com>
Date: Thu, 11 Dec 2014 18:45:02 UTC
Severity: minor
Tags: confirmed, wontfix
Found in version 24.4
Done: Noam Postavsky <npostavs <at> users.sourceforge.net>
Bug is archived. No further changes may be made.
View this message in rfc822 format
From: Demetrios Obenour <demetriobenour <at> gmail.com> To: 19350 <at> debbugs.gnu.org Subject: bug#19350: 24.4; Incorrect quoting of %-signs for Windows command shell Date: Thu, 11 Dec 2014 13:43:50 -0500
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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