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Date: Wed, 6 Aug 2014 14:12:00 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: ????????? <g548462@...il.com>
Cc: musl@...ts.openwall.com
Subject: Re: fnmatch bug?
* ????????? <g548462@...il.com> [2014-08-06 18:11:22 +0800]:
> I have do another experiment.
>
i added the mailing list back to CC in case others have fnmatch
issues as well
> musl-libc:
> i = fnmatch("\\","\\",0); // it returns 0 -> i=0
> i = fnmatch("\\","\\",FNM_NOESCAPE); // it also returns 0 -> i=0
>
> But I think this two lines of code should return different value because I
> set the FNM_NOESCAPE flag.
fnmatch behaviour is unclear when the pattern ends in \
this is a bug in posix 2008 we reported earlier:
http://austingroupbugs.net/view.php?id=806
in the next revision of posix the current behaviour will
be non-conforming (there is a test for this in libc-test)
with FNM_NOESCAPE \ is not special so '\\' matches '\\'
> I also do same experiment in glibc:
> glibc:
> i = fnmatch("\\","\\",0); // it returns 1 -> i=1
> i = fnmatch("\\","\\",FNM_NOESCAPE); // it returns 0 -> i=0
yes this is allowed
> In another case:
> musl-libc:
> i = fnmatch("[1\\]","[1]",0); // it returns 1 -> i=1
> glibc:
> i = fnmatch("[1\\]","[1]",0); //it returns 0 -> i=0
>
> Because I DON'T set FNM_NOESCAPE flag, so glibc will escape ']' with two '\'
> And the return value should be 0 (match '[1]')
> Is it right ?
glibc is wrong here, in a bracket expression \ is not special
in any way, "[1\\]" only matches a single '1' or '\\' character
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