Upstream-Status: Backport Signed-off-by: Li Xin From https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6c84109cfa26f35c3dfed3acb97d347361bd5849 Author: Carlos O'Donell Date: Thu Oct 8 16:34:53 2015 -0400 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. (cherry picked from commit 87701a58e291bd7ac3b407d10a829dac52c9c16e) --- locale/C-collate.c | 4 +- locale/categories.def | 1 - locale/langinfo.h | 1 - locale/localeinfo.h | 7 ---- locale/programs/ld-collate.c | 9 ----- string/bug-strcoll2.c | 95 ++++++++++++++++++++++++++++++++++++++++++++ string/strcoll_l.c | 39 +----------------- wcsmbs/wcscoll_l.c | 1 - 8 files changed, 98 insertions(+), 59 deletions(-) create mode 100644 string/bug-strcoll2.c diff --git a/locale/C-collate.c b/locale/C-collate.c index d7f3c55..06dfdfa 100644 --- a/locale/C-collate.c +++ b/locale/C-collate.c @@ -144,8 +144,6 @@ const struct __locale_data _nl_C_LC_COLLATE attribute_hidden = /* _NL_COLLATE_COLLSEQWC */ { .string = (const char *) collseqwc }, /* _NL_COLLATE_CODESET */ - { .string = _nl_C_codeset }, - /* _NL_COLLATE_ENCODING_TYPE */ - { .word = __cet_8bit } + { .string = _nl_C_codeset } } }; diff --git a/locale/categories.def b/locale/categories.def index 045489d..a8dda53 100644 --- a/locale/categories.def +++ b/locale/categories.def @@ -58,7 +58,6 @@ DEFINE_CATEGORY DEFINE_ELEMENT (_NL_COLLATE_COLLSEQMB, "collate-collseqmb", std, wstring) DEFINE_ELEMENT (_NL_COLLATE_COLLSEQWC, "collate-collseqwc", std, wstring) DEFINE_ELEMENT (_NL_COLLATE_CODESET, "collate-codeset", std, string) - DEFINE_ELEMENT (_NL_COLLATE_ENCODING_TYPE, "collate-encoding-type", std, word) ), NO_POSTLOAD) diff --git a/locale/langinfo.h b/locale/langinfo.h index ffc5c7f..a565d9d 100644 --- a/locale/langinfo.h +++ b/locale/langinfo.h @@ -255,7 +255,6 @@ enum _NL_COLLATE_COLLSEQMB, _NL_COLLATE_COLLSEQWC, _NL_COLLATE_CODESET, - _NL_COLLATE_ENCODING_TYPE, _NL_NUM_LC_COLLATE, /* LC_CTYPE category: character classification. diff --git a/locale/localeinfo.h b/locale/localeinfo.h index a7516c0..c076d8e 100644 --- a/locale/localeinfo.h +++ b/locale/localeinfo.h @@ -110,13 +110,6 @@ enum coll_sort_rule sort_mask }; -/* Collation encoding type. */ -enum collation_encoding_type -{ - __cet_other, - __cet_8bit, - __cet_utf8 -}; /* We can map the types of the entries into a few categories. */ enum value_type diff --git a/locale/programs/ld-collate.c b/locale/programs/ld-collate.c index 16e9039..3c88c6d 100644 --- a/locale/programs/ld-collate.c +++ b/locale/programs/ld-collate.c @@ -32,7 +32,6 @@ #include "linereader.h" #include "locfile.h" #include "elem-hash.h" -#include "../localeinfo.h" /* Uncomment the following line in the production version. */ /* #define NDEBUG 1 */ @@ -2130,8 +2129,6 @@ collate_output (struct localedef_t *locale, const struct charmap_t *charmap, /* The words have to be handled specially. */ if (idx == _NL_ITEM_INDEX (_NL_COLLATE_SYMB_HASH_SIZEMB)) add_locale_uint32 (&file, 0); - else if (idx == _NL_ITEM_INDEX (_NL_COLLATE_ENCODING_TYPE)) - add_locale_uint32 (&file, __cet_other); else add_locale_empty (&file); } @@ -2495,12 +2492,6 @@ collate_output (struct localedef_t *locale, const struct charmap_t *charmap, add_locale_raw_data (&file, collate->mbseqorder, 256); add_locale_collseq_table (&file, &collate->wcseqorder); add_locale_string (&file, charmap->code_set_name); - if (strcmp (charmap->code_set_name, "UTF-8") == 0) - add_locale_uint32 (&file, __cet_utf8); - else if (charmap->mb_cur_max == 1) - add_locale_uint32 (&file, __cet_8bit); - else - add_locale_uint32 (&file, __cet_other); write_locale_data (output_path, LC_COLLATE, "LC_COLLATE", &file); obstack_free (&weightpool, NULL); diff --git a/string/bug-strcoll2.c b/string/bug-strcoll2.c new file mode 100644 index 0000000..950b090 --- /dev/null +++ b/string/bug-strcoll2.c @@ -0,0 +1,95 @@ +/* Bug 18589: sort-test.sh fails at random. + * Copyright (C) 1998-2015 Free Software Foundation, Inc. + * This file is part of the GNU C Library. + * Contributed by Ulrich Drepper , 1998. + * + * The GNU C Library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * The GNU C Library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with the GNU C Library; if not, see + * . */ + +#include +#include +#include + +/* An incorrect strcoll optimization resulted in incorrect + * results from strcoll for cs_CZ and da_DK. */ + +int +test_cs_CZ (void) +{ + const char t1[] = "config"; + const char t2[] = "choose"; + if (setlocale (LC_ALL, "cs_CZ.UTF-8") == NULL) + { + perror ("setlocale"); + return 1; + } + /* In Czech the digraph ch sorts after c, therefore we expect + * config to sort before choose. */ + int a = strcoll (t1, t2); + int b = strcoll (t2, t1); + printf ("strcoll (\"%s\", \"%s\") = %d\n", t1, t2, a); + printf ("strcoll (\"%s\", \"%s\") = %d\n", t2, t1, b); + if (a < 0 && b > 0) + { + puts ("PASS: config < choose"); + return 0; + } + else + { + puts ("FAIL: Wrong sorting in cz_CZ.UTF-8."); + return 1; + } +} + +int +test_da_DK (void) +{ + const char t1[] = "AS"; + const char t2[] = "AA"; + if (setlocale (LC_ALL, "da_DK.ISO-8859-1") == NULL) + { + perror ("setlocale"); + return 1; + } + /* AA should be treated as the last letter of the Danish alphabet, + * hence sorting after AS. */ + int a = strcoll (t1, t2); + int b = strcoll (t2, t1); + printf ("strcoll (\"%s\", \"%s\") = %d\n", t1, t2, a); + printf ("strcoll (\"%s\", \"%s\") = %d\n", t2, t1, b); + if (a < 0 && b > 0) + { + puts ("PASS: AS < AA"); + return 0; + } + else + { + puts ("FAIL: Wrong sorting in da_DK.ISO-8859-1"); + return 1; + } +} + +static int +do_test (void) +{ + int err = 0; + err |= test_cs_CZ (); + err |= test_da_DK (); + return err; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" + + diff --git a/string/strcoll_l.c b/string/strcoll_l.c index b36b18c..a18b65e 100644 --- a/string/strcoll_l.c +++ b/string/strcoll_l.c @@ -30,7 +30,6 @@ # define STRING_TYPE char # define USTRING_TYPE unsigned char # define STRCOLL __strcoll_l -# define STRDIFF __strdiff # define STRCMP strcmp # define WEIGHT_H "../locale/weight.h" # define SUFFIX MB @@ -43,19 +42,6 @@ #include "../locale/localeinfo.h" #include WEIGHT_H -#define MASK_UTF8_7BIT (1 << 7) -#define MASK_UTF8_START (3 << 6) - -size_t -STRDIFF (const STRING_TYPE *s, const STRING_TYPE *t) -{ - size_t n; - - for (n = 0; *s != '\0' && *s++ == *t++; ++n) - continue; - - return n; -} /* Track status while looking for sequences in a string. */ typedef struct @@ -274,29 +260,9 @@ STRCOLL (const STRING_TYPE *s1, const STRING_TYPE *s2, __locale_t l) const USTRING_TYPE *extra; const int32_t *indirect; - /* In case there is no locale specific sort order (C / POSIX). */ if (nrules == 0) return STRCMP (s1, s2); - /* Fast forward to the position of the first difference. Needs to be - encoding aware as the byte-by-byte comparison can stop in the middle - of a char sequence for multibyte encodings like UTF-8. */ - uint_fast32_t encoding = - current->values[_NL_ITEM_INDEX (_NL_COLLATE_ENCODING_TYPE)].word; - if (encoding != __cet_other) - { - size_t diff = STRDIFF (s1, s2); - if (diff > 0) - { - if (encoding == __cet_utf8 && (*(s1 + diff) & MASK_UTF8_7BIT) != 0) - do - diff--; - while (diff > 0 && (*(s1 + diff) & MASK_UTF8_START) != MASK_UTF8_START); - s1 += diff; - s2 += diff; - } - } - /* Catch empty strings. */ if (__glibc_unlikely (*s1 == '\0') || __glibc_unlikely (*s2 == '\0')) return (*s1 != '\0') - (*s2 != '\0'); @@ -363,9 +329,8 @@ STRCOLL (const STRING_TYPE *s1, const STRING_TYPE *s2, __locale_t l) byte-level comparison to ensure that we don't waste time going through multiple passes for totally equal strings before proceeding to subsequent passes. */ - if (pass == 0 && encoding == __cet_other && - STRCMP (s1, s2) == 0) - return result; + if (pass == 0 && STRCMP (s1, s2) == 0) + return result; else break; } diff --git a/wcsmbs/wcscoll_l.c b/wcsmbs/wcscoll_l.c index 6d9384a..87f240d 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 -- 1.8.4.2