[Development] 16-bit PCRE landed in upstream master

[Stephen Kelly]

Just FYI.

This is due for release in mid-January, so Qt 5.0 could depend on the 16 bit 
API already.

I'd recommend that the people who know about QRegExp take a look.

Thanks,


Zoltan Herczeg wrote:

> ------- You are receiving this mail because: -------
> You are on the CC list for the bug.
> 
> http://bugs.exim.org/show_bug.cgi?id=1049
> 
> 
> 
> 
> --- Comment #44 from Zoltan Herczeg
> <hzmester-Y8qEzhMunLyT9ig0jae3mg at public.gmane.org>  2011-12-29 19:02:01
> ---
>> ... but please note that the documentation has not been touched at all.
>> That is my next big job.
> 
> True, but the library itself is ready to try, and we would be really happy
> if you would give us feedback about the library (especially from those who
> plan to use it).
> 
> Let me give you a short guide about the 16 bit PCRE library.
> 
> When you checkout PCRE you need to create the configure script first. The
> following two command do this:
>   svn co svn://vcs.exim.org/pcre/code/trunk pcre
>   libtoolize -c -f && aclocal && autoheader && automake -a -c && autoconf
> 
> Here are the new options added to configure:
>   --enable-pcre8 / --disable-pcre8 (enabled by default)
>   --enable-pcre16 / --disable-pcre16 (disabled by default)
>   --enable-utf / --disable-utf (disabled by default)
>        replaces --enable-utf8 which is obsolote from
>        now on, although it is kept for compatibility for some time.
>        The value set for --enable/disable-utf8 is simply
>        copied to --enable/disable-utf
> 
> With --enable-pcre8 the usual libpcre is created. Same performance, same
> binary size, it is not really changed. We hope this keep users of the 8
> bit library happy. However, with --enable-pcre16 a new, libpcre16 library
> is created, which contains the 16 bit functions.
> 
> About the new API:
> We still have a single pcre.h, which contains the forward declarations of
> both 8 and 16 bit functions. This is not an issue in C, just don't use
> functions from a library which is not linked to your application (with
> -lpcre or -lpcre16).
> 
> The API itself is pretty simple: every function has a 16 bit counterpart,
> starting with pcre16_ prefix. I.e: pcre_compile, pcre16_compile. That's
> all. They have the same arguments, except some char* pointers are replaced
> to short* when appropriate.
> 
> Example:
> PCRE_EXP_DECL pcre *pcre_compile(const char *, int, const char **, int *,
>                   const unsigned char *);
> PCRE_EXP_DECL pcre *pcre16_compile(PCRE_SPTR16, int, const char **, int *,
>                   const unsigned char *);
> 
> PCRE_SPTR16 is const short *
> 
> Warning: do not mix 8 and 16 bit API! Example: value returned by
> pcre16_study must be freed by pcre16_free_study! Segfaults will occure if
> you use pcre_free_study! Also, use pcre16_free for freeing the compiled
> regex returned by pcre16_compile, not pcre_free. Keep in mind that all
> functions and static variables are duplicated!
> 
> One more thing: --disable-pcre8 also disable posix API, pcregrep and
> pcrecpp. These utilities have no 16 bit counterpart, and not planned at
> the moment until someone need them (especially for posix API, since posix
> standard has no 16 bit API for regex).
> 
> However --enable-utf --enable-unicode-properties and --enable-jit is
> supported by both 8 and 16 bit libraries as well.
> 
> Updating the CMAKE build system is still an open task, we would be really
> happy if someone could help us!
> 
> 

-- 
Stephen Kelly <stephen.kelly at kdab.com> | Software Engineer
KDAB (Deutschland) GmbH & Co.KG, a KDAB Group Company
www.kdab.com || Germany +49-30-521325470 || Sweden (HQ) +46-563-540090
KDAB - Qt Experts - Platform-Independent Software Solutions
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