On 04/02/2025 07:15, Splitline Huang via Cygwin wrote:
Hello Cygwin team,
I am splitline from DEVCORE research team. I recently have observed an
inconsistency
in how Cygwin handles command-line parsing compared to Microsoft’s
implementation.
According to Microsoft’s documentation [1], the \" sequence should always
be
interpreted as a literal double quote ("):
A double quote mark preceded by a backslash (\") is interpreted as a
literal
double quote mark (").
However, in Cygwin, the same sequence treats the backslash as a literal
character
and starts quote mode instead.
$ which python
/cygdrive/c/Python313/python
splitline@SPLITLINE0D06 ~
$ python
Python 3.13.1 (tags/v3.13.1:0671451, Dec 3 2024, 19:06:28) [MSC v.1942
64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
import subprocess
subprocess.run(['./test.exe', '"', " a b c"]) # should be only 2 args
argv[0] = ./test
argv[1] = \
argv[2] = a
argv[3] = b
argv[4] = c
CompletedProcess(args=['./test.exe', '"', ' a b c'], returncode=0)
As we can see, it should originally be only 2 arguments: ["] and [ a b c].
However,
the command line is parsed into 4 different arguments.
$ python3.12
Python 3.12.8 (main, Jan 31 2025, 21:29:51) [GCC 12.4.0] on cygwin
Type "help", "copyright", "credits" or "license" for more information.
import subprocess
subprocess.run(['./test.exe', '"', " a b c"])
argv[0] = ./test
argv[1] = "
argv[2] = a b c
CompletedProcess(args=['./test.exe', '"', ' a b c'], returncode=0)
it seems correct to me for a Cygwin Python
Note: With that Python code, the spawned command line is: ./test.exe \" " a
b c"
Please let me know if you have any questions, thanks!
Best regards,
splitline
DEVCORE
Regards
Marco
PS: Windows is not very consistent on quoting behaviour, e.g.
https://github.com/Azure/azure-cli/blob/dev/doc/quoting-issues-with-powershell.md
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