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


From: Paul Eggert
Subject: Re: [bug-gnulib] bugs in regexp.c
Date: Tue, 08 Mar 2005 17:03:27 -0800
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.4 (gnu/linux)

Sam Steingold <address@hidden> writes:

> regexp.c exhibits the following 8 bugs:
>
> 1. regcomp("*a"): "Invalid preceding regular expression"
> 2. regcomp("^*"): "Invalid preceding regular expression"
> 3. regcomp("$*"): "Invalid preceding regular expression"
> 4. regcomp("(*)b"): "Invalid preceding regular expression"
> 5. regcomp("{[^}\n]*}"): "Invalid content of \\{\\}"
> 6. regcomp("{[^}\n]*}"): "Invalid content of \\{\\}"
> 7. regcomp ("{[^}\n]*}"): "Invalid content of \\{\\}"
> 8. regcomp("[[:xdigit]+") works, but when the result is matched against
>    "0[x:dig", it matches just "[", not "[x:dig"

(3) is a bug, but the others aren't bugs, surely, since POSIX says
those other EREs are invalid or have undefined behavior.  Perhaps you
need to update the CLISP regexp test suite?

>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.




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