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From: =?ISO-8859-1?Q?Sven_K=F6hler?= <remove-sven.koehler@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: exec problem is JDK 1.7.0_21
Date: Wed, 24 Apr 2013 09:29:35 +0300
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Am 24.04.2013 01:39, schrieb Steven Simpson:
>> Also, you have to add another backslash if the quote does not terminate
>> the argument.
> 
> Again, I took it to mean that the first two rules produce the same
> result, so \\\" and \\" both produce \".

The documentation of CommandLineToArgv is incomplete. \\" produces a
single backslash, and the quote is the closing quote.
\" and \\\" produce a non-closing quote resp. a backslash followed by a
non-closing quote.

>> Here's my attempt to the do the escaping:
>> http://sourceforge.net/p/lejos/code/HEAD/tree/trunk/org.lejos.nxt.ldt/src/main/java/org/lejos/nxt/ldt/util/LeJOSNXJUtil.java#l421
>>
> 
> I haven't looked in detail at it, but do note your comment:
>> * How decoding works:
>> * 2n backslashes + quote => n backslashes + closing quote
>> * 2n+1 backslashes + quote => n backslashes + inner quote
>> * n backslashes not followed by a quote => n backslashes
> 
> From
> <http://msdn.microsoft.com/en-us/library/windows/desktop/bb776391%28v=vs.85%29.aspx>
> (with my emphasis):
>>
>>   * 2/n/ backslashes followed by a quotation mark produce /n/
>>     backslashes followed by a quotation mark.
>>   * (2/n/) + 1 backslashes followed by a quotation mark *again*
>>     produce /n/ backslashes followed by a quotation mark.
>>   * /n/ backslashes not followed by a quotation mark simply produce
>>     /n/ backslashes.
>>
>>
> 
> Where are you getting the notion that the first two rules imply
> different quotes?  I interpret both as being literal (inner, right?).

Well, by testing. As you can test yourself on the command line, \\" will
result in a closing quote and \" and \\\" will result in non-closing quotes.

Also, there HAS to be a way to distinguish a closing vs. a non-closing
quote. Otherwise you wouldn't know whether the quotes in \" \\" and \\\"
were closing or not. That's it is not documented is just a real shame!


Regards,
  Sven