[PATCH] improve regex performance

[Isamu Hasegawa]

Hello,

The performance of current implementation of regex has a problem,
if we use the re_search() interface in multibyte environments.

Attached patch can improve the performance by moving the conversion
(from multibyte to wchar) to re_search_2.

How about this patch?

If it is acceptable, the Changelog entry is like this:

2001-06-20 Isamu Hasegawa <isamu@yamato.ibm.com>

	* posix/regex.c(FREE_WCS_BUFFERS): New macro to free buffers.
	(re_search_2): invoke convert_mbs_to_wcs and FREE_WCS_BUFFERS.
	(wcs_re_match_2_internal): Check whether the wcs buffers need
	seting up or not, and skip seting up routin if not needed.

Thanks,
--
Isamu Hasegawa
IBM Japan, Ltd.
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