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Date:	Mon, 7 May 2001 15:25:14 +0200
From:	Corinna Vinschen <cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Regular expressions compile call.
Message-ID:	<20010507152514.B24200@cygbert.vinschen.de>
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References:	<OFAF7FC14E DOT 8BB28340-ONC1256A45 DOT 00445D13 AT stoltoffshore DOT no>
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In-Reply-To:	<OFAF7FC14E.8BB28340-ONC1256A45.00445D13@stoltoffshore.no>; from oddvard.myrnes@stoltoffshore.no on Mon, May 07, 2001 at 02:33:09PM +0200

On Mon, May 07, 2001 at 02:33:09PM +0200, oddvard DOT myrnes AT stoltoffshore DOT no wrote:
> I am working on a cygwin port from Linux. Straight forward, but one thing
> puzzels me. Why is the regcomp call diffrent. I have to use this pice of
> code to make it work on both platforms:
> 
> #ifdef cygwin
>     regex_t *re;
> #else
>     regex_t a, *re;
>     re = &a;
> #endif
> 
>     i = regcomp(re, filter, REG_EXTENDED);
> 
> If I use a preallocated buffer in Cygwin i get an i = 269335288 = random.
> Program gets unstable after the call. If I use a pointer it works.
> 
> On the linux box (Suse 7.0) I get a segmentation violation trying to run
> with a pointer. Will run fine with a preallocated buffer. They are oposite
> in behavior. What do I miss?

Cygwin itself contains a very old implementation of regex which
isn't compatible with any standard I'm aware of.

But the Cygwin net distro contains two packages regex-4.4 and
pcre-3.4 which provide libraries which contain POSIX regex APIs.
If you have installed them (recommended), just include the
correct headers

	regex-4.4:	regex.h
	pcre-3.4:	pcreposix.h 

and link with

	regex-4.4:	-lregex
	pcre-3.4:	-lpcre -lpcreposix

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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