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Date: Wed, 01 Jul 2009 12:37:11 +0200
From: grischka <gr1008 AT googlemail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: commanline argument parsing
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Haojun Bao wrote:
> grischka <gr1008 AT googlemail DOT com> writes:
> 
>> If I compile this snippet:
>>
>> #include <stdio.h>
>> int main (int argc, char **argv)
>> {
>>     int i;
>>     for (i = 0; i < argc; ++i)
>>         printf("argv[%d] %s\n", i, argv[i]);
>>     return 0;
>> }
>>
>> with cygwin GCC and then run it from CMD prompt:
>>
>>     C:\cygwin\home\me> test \"stuff\"
>>
>> it prints this:
>>
>>     argv[0] test
>>     argv[1] \stuff"
>>
>> Is that expected?  I'm aware that there is some conversion going on
>> and that it's meant to work from a cygwin shell really, but still.
> 
> Yes, it's expected. The 1st `\' is not special to windows, so it get
> printed, the 1st `"' start a quote and it's removed, the 2nd `\' is in a
> quoted string, so it's removed but the 2nd `"' following it gets
> printed. And you didn't end your quoted string properly.

Indeed, it looks like that \ can escape " within "..." but not
outside.

That is per se logical, just that such logic doesn't seem to exist
neither in windows nor in posix.  So I still wonder how it comes
into play.

> You can also try test "x""y", it should print `argv[1] x"y'

That looks more familiar like if it came from windows.

Then again, cygwin also parses "x:y""z" into x:y\z.  Hm.  Is this
now because me didn't quote properly or is it an artifact from the
posix/windows mix or is it something clever, under circumstances?

--- gr

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