From 87701a58e291bd7ac3b407d10a829dac52c9c16e Mon Sep 17 00:00:00 2001 From: Carlos O'Donell Date: Thu, 8 Oct 2015 16:34:53 -0400 Subject: strcoll: Remove incorrect STRDIFF-based optimization (Bug 18589). The optimization introduced in commit f13c2a8dff2329c6692a80176262ceaaf8a6f74e, causes regressions in sorting for languages that have digraphs that change sort order, like cs_CZ which sorts ch between h and i. My analysis shows the fast-forwarding optimization in STRCOLL advances through a digraph while possibly stopping in the middle which results in a subsequent skipping of the digraph and incorrect sorting. The optimization is incorrect as implemented and because of that I'm removing it for 2.23, and I will also commit this fix for 2.22 where it was originally introduced. This patch reverts the optimization, introduces a new bug-strcoll2.c regression test that tests both cs_CZ.UTF-8 and da_DK.ISO-8859-1 and ensures they sort one digraph each correctly. The optimization can't be applied without regressing this test. Checked on x86_64, bug-strcoll2.c fails without this patch and passes after. This will also get a fix on 2.22 which has the same bug. --- wcsmbs/wcscoll_l.c | 1 - 1 file changed, 1 deletion(-) (limited to 'wcsmbs') diff --git a/wcsmbs/wcscoll_l.c b/wcsmbs/wcscoll_l.c index 6d9384ad64..87f240d281 100644 --- a/wcsmbs/wcscoll_l.c +++ b/wcsmbs/wcscoll_l.c @@ -23,7 +23,6 @@ #define STRING_TYPE wchar_t #define USTRING_TYPE wint_t #define STRCOLL __wcscoll_l -#define STRDIFF __wcsdiff #define STRCMP __wcscmp #define WEIGHT_H "../locale/weightwc.h" #define SUFFIX WC -- cgit 1.4.1