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[bug-gnulib] Re: bugs in regexp.c


From: Paul Eggert
Subject: [bug-gnulib] Re: bugs in regexp.c
Date: Thu, 10 Mar 2005 16:29:50 -0800
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.4 (gnu/linux)

Sam Steingold <address@hidden> writes:

>>> 3. regcomp("$*"): "Invalid preceding regular expression"
>>> 8. regcomp("[[:xdigit]+") works, but when the result is matched against
>>>    "0[x:dig", it matches just "[", not "[x:dig"
>
> what's wrong with 8?

POSIX says:

  The character sequences "[.", "[=", and "[:" (left-bracket followed
  by a period, equals-sign, or colon) shall be special inside a bracket
  expression and are used to delimit collating symbols, equivalence
  class expressions, and character class expressions. These symbols
  shall be followed by a valid expression and the matching terminating
  sequence ".]", "=]", or ":]", as described in the following items.

(8) violates a "shall" so it's not a good test case.

>> From the current gnulib code, I don't see how (3) could happen, so I'm
>> at a bit of a loss about how that bug occurs.
>
> well, it _does_ occur.

I agree, it's just that I don't see how it happens, and I don't know
how to reproduce it easily.




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