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Date:	Mon, 12 Dec 2011 17:45:13 +0400
From:	Dmitry Bolshakov <dmitry DOT bolshakov AT bridge-quest DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	it seems a bug inside cygwin in parsing command line with double quotes and backslashes
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hi

when launching cygwin's programs from within windows's cmd
if the command line parameter has two backslashes and is double quoted (e.g. a path to local network drive)
then inside cygwin's program the corresponding ARGV element has single backslash only
but without double quotes all is ok - both backslashes are kept

simple testcase

C:\Documents and Settings\bdimych>cmd
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>c:\cygwin\bin\bash -c "set -x; : $*" -- "\\blabla"
+ : '\blabla'

C:\Documents and Settings\bdimych>c:\cygwin\bin\bash -c "set -x; : $*" -- \\blabla
+ : '\\blabla'

C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>c:\Perl\bin\perl.exe -e "print $ARGV[0]" "\\blabla"
\\blabla
C:\Documents and Settings\bdimych>c:\cygwin\bin\perl.exe -e "print $ARGV[0]" "\\blabla"
\blabla
C:\Documents and Settings\bdimych>c:\cygwin\bin\perl.exe -e "print $ARGV[0]" \\blabla
\\blabla
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>c:\Ruby192\bin\ruby.exe -e "print ARGV[0]" "\\blabla"
\\blabla
C:\Documents and Settings\bdimych>c:\cygwin\bin\ruby.exe -e "print ARGV[0]" "\\blabla"
\blabla
C:\Documents and Settings\bdimych>c:\cygwin\bin\ruby.exe -e "print ARGV[0]" \\blabla
\\blabla
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>


it seems a bug somewhere inside cygwin libraries










PS

cygwin version
bdimych AT bolshakovxp ~
$ uname -a
CYGWIN_NT-5.1 bolshakovxp 1.7.9(0.237/5/3) 2011-03-29 10:10 i686 Cygwin









PPS

whoops, tcl occured has no this bug
it has some initialization problems but the value has two backslashes


C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>echo puts $argv | c:\Tcl\bin\tclsh.exe - "\\blabla"
- {\\blabla}

C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>echo puts $argv | c:\cygwin\bin\tclsh84.exe - "\\blabla"
application-specific initialization failed: Can't find a usable init.tcl in the following directories:
     c:/cygwin/share/tcl8.4 c:/cygwin/share/tcl8.4 c:/cygwin/usr/share/tcl8.4 c:/share/tcl8.4 c:/cygwin/library c:/library c:/../tcl8.4.1/library



This probably means that Tcl wasn't installed properly.

- {\\blabla}

C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>echo puts $argv | c:\cygwin\bin\tclsh84.exe - \\blabla
application-specific initialization failed: Can't find a usable init.tcl in the following directories:
     c:/cygwin/share/tcl8.4 c:/cygwin/share/tcl8.4 c:/cygwin/usr/share/tcl8.4 c:/share/tcl8.4 c:/cygwin/library c:/library c:/../tcl8.4.1/library



This probably means that Tcl wasn't installed properly.

- {\\blabla}

C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>







PPPS

gawk has

C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>c:\cygwin\bin\gawk.exe "BEGIN {print ARGV[1]; exit}" "\\blabla"
\blabla

C:\Documents and Settings\bdimych>c:\cygwin\bin\gawk.exe "BEGIN {print ARGV[1]; exit}" \\blabla
\\blabla

C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>
C:\Documents and Settings\bdimych>



-- 
With best regards
Dmitry Bolshakov

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