On Tue, Dec 6, 2016 at 10:35 PM, Nathan Ernst <nathan.er...@gmail.com> wrote:
> One other consideration in regards to globbing in the argument list:
> there's a static limit to the byte length of argv. On windows, it's 8191
> bytes (I'm assuming a null-terminator brings that to 8192, which is a weird
> 2**13).
I know strings in cmd.exe are limited to about 8K characters, so
that's probably the limit you observed. The Windows command line can
actually contain up to 65535 bytes. It's a sized UNICODE_STRING, which
uses a C unsigned short for the length. That's 32767 16-bit wide
characters, or 32766 sans the terminating NUL. For example:
parent:
>>> subprocess.call('python -ic " "' + ' a'*16375 + ' b')
child:
>>> import sys, win32api
>>> len(win32api.GetCommandLine())
32766
>>> sys.argv[:5]
['-c', 'a', 'a', 'a', 'a']
>>> sys.argv[-1]
'b'
>>> len(' '.join(sys.argv)) + len('python i " "')
32766
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