From: Erik Faye-Lund <kusmabite@gmail.com>
Date: Thu, 14 Oct 2010 00:47:01 GMT
Subject: Re: [msysGit] Re: [PATCH v4 02/15] mingw: implement syslog
Message-ID: <AANLkTi=C9RqQ-EKFN9fsBSHsSopgSuevTpjBj-R0jWcs@mail.gmail.com>
In-Reply-To: <AANLkTinj21hnpsHR49nS0u_FtpwA=2Q7ygNpowufRoDC@mail.gmail.com>

On Wed, Oct 13, 2010 at 11:17 PM, Pat Thoyts <patthoyts@gmail.com> wrote:
> On 13 October 2010 20:23, Eric Sunshine <sunshine@sunshineco.com> wrote:
>> On 10/13/2010 08:36 AM, Erik Faye-Lund wrote:
>>>
>>> On Tue, Oct 12, 2010 at 12:37 AM, Jonathan Nieder<jrnieder@gmail.com>
>>>  wrote:
>>>>
>>>> Erik Faye-Lund wrote:
>>>>
>>>>> The string gets inlined into itself (with a limit of 100 expansions)
>>>>> leading to string like "foo %1 bar" becoming "foo foo foo ... foo %1
>>>>> bar bar bar ... bar". With our expansion, it becomes "foo % 1 bar"
>>>>> instead.
>>>>
>>>> Ah, ok.  Sounds like there is no need to worry about requests for "%%1"
>>>> etc.  Thanks for explaining.
>>>>
>>> Actually, %%1 is a bit of a tricky one. It seems that %%1 is used to
>>> escape %1 on Windows 7, but not on earlier Windows version. I did test
>>> this on Vista an XP earlier, but I'll re-test again later and report
>>> back, in case my earlier tests were flawed.
>>

Meh. Windows XP does not escape %%1 to %1, it has the same
expansion-problem as %1 does. In other words, my old assertion is
still valid.

>> If that worked universally, escaping '%1' to '%%1' certainly would be nicer
>> than '% 1'. (More generally, escape '%n' to '%%n', where n is a number.) It
>> also would simplify the log message.
>>
>>> Can %%1 occur in an IPv6 address at all? If not, I'm tempted to not
>>> handle it (unless it turns out I was wrong about %%1-escaping on Vista
>>> and XP).
>>
>> According to sources I have studied, %%1 would be unlikely (or perhaps
>> invalid) in IPv6 addresses.
>>
>> http://en.wikipedia.org/wiki/IPv6_address#Link-local_addresses_and_zone_indices
>
> Not on windows. Try ipconfig:
>   Link-local IPv6 Address . . . . . : fe80::c9fb:7840:66f5:b2e9%13
>   Default Gateway . . . . . . . . . : fe80::20c:76ff:fe1e:e00%11
> and so on. Its an interface fragment or something.
>
> However - we really don't care. You can just substitute these to
> spaces and no-one will care. Keep it simple.
>

Uh, none of these contain a double percent-sign. Am I misunderstanding
what you're replying to?